FIELD OF THE INVENTION
[0001] The present invention relates to a resonant assembly.
BACKGROUND
[0002] Resonant devices are known. In low-frequency electronics, a resonant circuit contains
a capacitor and a coil. The capacitor is used to store electrical energy and the coil
stores magnetic energy. At resonance, energy stored in the resonant circuit is continuously
converted between two states, swapping between capacitor and coil over time. At higher
frequencies, transmission lines can resonate. A quarter-wavelength transmission line
with one end grounded and the other end open can be seen as a combination of a capacitor
and coil. Increasing the permittivity of the transmission line by using, for example,
ceramic materials reduces the size of the resonant device. Resonant devices are often
used in radio-frequency (RF) front ends. Each resonant device has its own characteristics,
including its own resonance frequency. The resonance frequency is dependent on the
characteristics of the device and, in particular, on the characteristics of the mixtures
of various materials making up the device.
[0003] It is desired to provide an improved resonant device.
[0004] WO2009/056813 discloses a tunable filter with a cavity and two resonant posts therein, the coupling
between the two resonators and/or the resonant frequency of the second resonator can
be tuned to tune both the central operating frequency and the bandwidth of the filter.
[0005] WO2013/036485 discloses an open circuit common junction feed for a duplexer, comprising a combline
cavity filter comprising a plurality of resonator posts, tuning screws are used to
tune one half to one frequency and the other half to another frequency a central post
being a common resonator.
[0006] US2012/0249266 discloses an RF filter cavity for adjusting coupling amount or transmission zero.
It comprises a plurality of cavities each with a single post therein.
[0007] WO 2009/067056 discloses a dual-mode filter comprising a cavity with two or more resonant rods arranged
orthoganally to each other.
[0008] JP2002 359502 discloses a dielectric resonator band-pass filter with two dielectric resonators
and coupling elements for coupling radio waves excited on one of the dielectric resonators
to the other dielectric resonator.
SUMMARY
[0009] According to a first aspect, there is provided a resonator assembly, comprising:
a resonator having a first resonance post coaxially surrounded by a conductive enclosure
defining a cavity, the first resonance post being operable to filter a signal at a
first frequency and a second resonance post located within the cavity, the second
resonance post being operable to filter the signal at a second frequency; wherein
said first and second resonance posts are configured such that harmonics of said first
frequency fail to coincide with harmonics of said second frequency and a ratio of
said second frequency to first frequency is not close to unity such that resonances
of the cavity at said first and second frequencies are uncoupled; and
said first resonance post is located centrally within said conductive enclosure and
said second resonance post is located away from said first resonance post and towards
said conductive enclosure; and
said first resonance post and said second resonance post upstand from a same face
of said conductive enclosure.
[0010] The first aspect recognises that conventional resonators such as, for example, a
Transverse ElectroMagnetic (TEM) combline resonator shown in Figure 1, consists of
a metallic cavity enclosure (with a generally circular-shaped or rectangular-shaped
cross section) with a cylindrical-shaped metallic post at the centre of the circular/rectangular
cavity grounded at one side and open-ended at the opposite side. Each of these resonators
is dimensioned to provide a resonance at a particular desired frequency. However,
the first aspect recognises that it is possible to reuse the cavity in order provide
a resonator which provides a resonance at more than one particular desired frequency.
[0011] Accordingly a resonator assembly may be provided. The assembly comprises a resonator
which has a first resonance post or element which is surrounded or enclosed by a conductive
enclosure or housing. The conductive enclosure defines a cavity. The first resonance
post resonates or filters a signal at a first frequency. The assembly comprises a
resonator which has a second resonance post or element located within the cavity.
The second resonance post resonates or filters a signal at a second frequency. Through
this approach it is possible to provide a single device which implements more than
one independent resonance within the same cavity volume, allowing to build significantly
smaller cavity filters, which avoids the need to provide separate devices, one for
each frequency. This is particular convenient in resonant assemblies used in RF front
ends which will often be required to receive signals at two different frequencies.
The posts may project or extend within the cavity.
[0012] In one embodiment, the second frequency is greater than the first frequency.
Harmonics of the first frequency fail to coincide with harmonics of the second frequency.
[0013] The second frequency and the first frequency have no common harmonics.
The first resonance post is located centrally within the conductive enclosure and
the second resonance post is located away from the first resonance post and towards
the conductive enclosure. Accordingly, the second resonance post may reuse part of
the cavity.
[0014] In one embodiment, at least one of the first resonance post and the second resonance
post is configured to have a variable length. In order to tune these two resonances
independently, a dedicated tuning mechanism for each resonance is provided. By varying
the length, the frequency may be tuned.
[0015] In one embodiment, at least one of the first resonance post and the second resonance
post comprises a first portion displaceable with respect to a second portion to vary
its length.
[0016] In one embodiment, the first portion is received within the second portion.
[0017] In one embodiment, the second portion comprises a post having a cavity extending
therethrough for receiving the first portion therewithin.
[0018] In one embodiment, the first portion comprises a screw received within a screw thread
formed within the cavity, the first portion being protrudable from the second portion
to vary its length. As mentioned above, conventionally, in order to build filters
with two or more resonances, individual physically separated filter cavities for each
frequency band are built and these then are tuned independently. Conventionally, these
resonances are tuned by tuning screws which protrude through a cavity wall or thorough
the cavity cover into the cavity, located close to the region with the highest electrical
field of the according resonant mode. However, this approach is often not possible
or implies restrictions on the resonator layout, particularly for the resonant mode
for the higher frequency which is excited on the shorter resonator post. For example,
where the physical distance between the top end of the resonator-post is large, a
long tuning screw would have a negative impact on the Q-factor of the resonator or
would even result in a complete detuning of the resonator. In some cases it might
be feasible to use a tuning screw from the side, but usually in more complex structures,
e.g. in a filter-configuration, where several cavities are placed next to each other,
this is not possible, since two rows of resonators are placed in parallel, making
it impossible to place tuning screws from the side.
[0019] A second aspect provides a filter comprising a plurality of the resonator assemblies
of the first aspect adjacently located and having shared portions of the conductive
enclosure, and wherein the second resonance post in each resonance assembly is located
towards the shared portions of the conductive enclosure.
[0020] Further particular and preferred aspects are set out in the accompanying independent
and dependent claims. Features of the dependent claims may be combined with features
of the independent claims as appropriate.
[0021] Where an apparatus feature is described as being operable to provide a function,
it will be appreciated that this includes an apparatus feature which provides that
function or which is adapted or configured to provide that function.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Embodiments of the present invention will now be described further, with reference
to the accompanying drawings, in which:
Figure 1 illustrates a Transverse ElectroMagnetic (TEM) combline resonator;
Figure 2 illustrates a dual-frequency combline resonator according to one embodiment;
Figure 3 illustrates the electric field distribution at resonance of the resonator
of Figure 2;
Figure 4 illustrates the magnetic field distribution at resonance of the resonator
of Figure 2;
Figures 5 and 6 illustrate feeding pin configurations according to embodiments;
Figure 7 illustrates tuning mechanisms according to embodiments;
Figure 8 illustrates a filter comprising a plurality of resonators according to one
embodiment;
Figure 9 illustrates a tuning mechanism according to one embodiment; and
Figure 10 illustrates the independent control of the tuning for individual resonances
utilizing the tuning screws.
DESCRIPTION OF THE EMBODIMENTS
Overview
[0023] Before discussing the embodiments in any more detail, first an overview will be provided.
An arrangement is provided where the cavity of a resonator is reused to co-house a
further resonator. This provides a device which is able to provide resonance at multiple
frequencies without needing to provide multiple devices, each with their own housing.
Instead, the resonators are co-located within the same housing. This enables a single
device to be provided which operates in same way as a plurality of different resonators,
but with a significantly reduced size compared to providing separate resonators. Although
the resonator structures can have similar permittivity and can vary their resonant
frequency by varying their length, varying the permittivity of the different resonator
structures enables similar-sized structures to resonate at different frequencies.
Also, although the embodiments described below provide for a two-frequency resonator,
it will be appreciated that by adding additional resonator structures within the housing
enables a more than two-frequency resonator to be provided.
Example Configuration
[0024] Figure 2 illustrates a dual-frequency combline resonator according to one embodiment.
This arrangement utilizes the physical space provided by the single, in this example,
rectangular, cavity provided in a combline package to include an additional metallic
cylindrical post offset from a central location and towards a corner of the rectangular
cavity. This is to introduce an additional electromagnetic resonance at a higher frequency.
Although a rectangular package is shown, it will be appreciated that any other configuration
which provides a coaxial arrangement between the metallic cylindrical post at the
central location and a surrounding conductive enclosure could be used. Also, although
the posts illustrated are cylindrical, it will be appreciated that non-cylindrical
posts may be used.
[0025] In operation, this arrangement creates two electromagnetic (EM) resonances at distinct
frequencies,
f1 (a lower frequency due to the centre metallic post) and
f2 (a higher frequency due to the corner metallic post). The centre metallic post within
the rectangular metallic cavity with the corner metallic post present resonates at
a frequency
f1 (which is slightly different to the frequency at which it would resonate if it were
alone within the cavity), whereas the metallic post at the corner within the cavity
with the metallic post at the centre present resonates at a higher desired frequency
f2 (
f2>
f1). Due to the distinct and separated in spectrum resonances at
f1 and
f2 for a dual-resonance cavity, the corner metallic post's physical size is a fraction
of the centre metallic post's size. This ratio is proportional (within limitations
of the frequency ratio
f2/
f1 and specific technology implementation variations) to the ratio of frequencies
f1 and
f2.
[0026] This arrangement enables two electromagnetic resonances at distinct frequencies in
a single physical volume within a single metallic enclosure in a combline package.
In addition this arrangement provides for dual-posts in a single cavity; a centre
post for lower frequency operation and a corner post for higher frequency operation.
Furthermore, this arrangement provides for the spatial separation of the resonance
field distribution to allow for independent control of input/output coupling/tuning/inter-resonator
coupling.
[0027] For optimal operation, the ratio of the frequencies (
f2/
f1) for the dual-resonance cavity should be selected so that the ratio (
f2/
f1) cannot be close to unity (i.e., the two frequencies cannot be very similar), since
the two resonances cannot then be uncoupled as required for two distinct filtering
functions to be realized. Also, for a combline package, the ratio between the frequencies
cannot be close to 3, since the first higher order resonance
n∗f1(
n=
3) of the low frequency resonance (
f1) will coincide with the second, high frequency fundamental mode resonance, (
f2). However, it will be appreciated that this is not a substantial problem for a number
of dual-frequency applications (e.g., operating at 700 MHz and 1800 MHz).
[0028] An eigenmode analysis tool has been utilized to calculate the resonant frequency
and Q-factor of the resonant structures considered. Ohmic losses are included in the
simulations; silver has been considered for the cavity walls and copper for the posts
(although other materials could be used). The results demonstrate that two resonant
modes can be supported with this configuration and that these resonant modes closely
correspond to the resonant modes of the individual standalone resonator modes of the
low-band and high-band resonators.
[0029] Figures 3 and 4 show the EM field distribution for the two resonant modes.
[0030] Table 1 summarizes the resonant frequency and Q-factor of the first 3 eigenmodes
of the standalone low-band combline resonator, standalone high-band resonator and
combined resonator of Figure 2.
Table 1: Resonant frequency and Q-factor for the first 3 eigenmodes of the standalone
low-band cavity, standalone high-band cavity, and combined low+high-band cavity
|
Mode 1 |
Mode 2 |
Mode 3 |
|
f0 (MHz) |
Q0 |
|
f0 (MHz) |
Q0 |
|
f0 (MHz) |
Q0 |
|
Low |
695.792 |
6407 |
|
2061.33 |
11389 |
|
2223.42 |
13850 |
|
High |
1792.12 |
4004 |
|
5237.13 |
7026 |
|
5722.69 |
8652 |
|
Low |
696.044 |
6186 |
f0 (%) |
1769.86 |
4449 |
f0 (%) |
2065.57 |
11243 |
f0 (%) |
+ |
|
|
0.04 U |
|
|
1.24 D |
|
|
0.26 |
High |
|
|
Q0 (%) |
|
|
Q0 (%) |
|
|
|
|
|
|
3.45 D |
|
|
11.1 U |
|
|
|
[0031] The low frequency resonance of the combined cavity resonator is not affected as compared
to the standalone low frequency cavity resonator. The Q-factor is slightly decreased
(3.45 %). Similarly, the high-frequency resonance is not affected, whereas the Q-factor
has been increased significantly (11.1 %). This is due to the greater electrical size
of the host cavity. It is to be noted that the first harmonic resonance frequency
of the standalone low-band resonator is not significantly affected by the inclusion
of the high-band metallic post, thus does not create problems for the high-band resonance
of the combined cavity.
Feeding Pin Configuration
[0032] Figures 5 and 6 illustrate three feeding pin configurations according to embodiments.
Figures 5a/6a would be suitable for an inline configuration, Figures 5b/6b would suit
a folded configuration and Figures 5c/6c show a suitable configuration for dual-band
filters. A combination of Figures 5c/6c with either Figures 5b/6b or Figures 5a/6a
would be suitable for a duplexer configuration. In Figures 5a/6a and 5b/6b, the inner
core of the coaxial feed is shown coupled towards the base of each post. However,
it will be appreciated that an alternative well-known approach would be instead to
couple towards the top of the post via spaced coin or capacitive disc arrangement.
[0033] In the arrangement shown in Figures 5a/6a, the coaxial feed enters the cavity through
the conductive wall. However, it is difficult to achieve a filter with desirable characteristics
using this feed arrangement for a multi-stage resonator where resonators are arranged
in series and each resonator is coupled to the next via adjoining portions of the
conductive wall. Accordingly, Figures 5b/6b and 5c/6c provide alternative feed arrangements
for such multi-stage resonators. In Figures 5b/6b, the coaxial feed for at least the
offset post comes through the floor of the conductive enclosure. In Figures 5c/6c,
the feed for both posts comes through the floor (or roof) of the conductive enclosure
and feeds a conductive rod spatially separated from both posts, but which provides
for EM coupling with both posts.
Tuning
[0034] Figure 7 illustrates an arrangement for tuning of the resonant frequencies. Unlike
for the central resonator post where it is possible to tune its resonant frequency
using a screw which projects towards the top of the post as shown in Figure 7, this
approach is not practical for the offset resonator post as the long length of such
a screw would affect the characteristics of the central resonator post. Also, it is
not possible to provide a screw extending towards the offset resonator post through
the conductive wall and still retain access to that screw in a multi-stage resonator
as shown in Figure 8. Hence, in order to provide for tuning of the resonant frequencies,
a tuning screw, which reaches through the resonator post, and out of the top of the
resonator post is provided. This enables a change in the effective length of the resonator
post and therefore allows for the tuning of the resonator frequency from the underside
of the cavity. In a multi-stage resonator, this enables all resonators to be tuned
from the underside, allowing for easy tuning of all resonators from one side.
[0035] As shown in Figure 9 there is provided a hollow resonator post, through which a screw
from the underside passes through. The pass-through of the screw can be implemented
is various ways, for example, with a thread at both ends of the resonator tube or
only on the top end of the resonator post. The resonator post can be mounted to the
resonator wall in different ways, for example, by a press-in-fit, by a thread or by
soldering, other methods are possible. Also various methods can be used to ensure
a good electrical and mechanical contact, for example, by spring loaded counter-screws
at the bottom of the resonators post.
[0036] Since the electric field at the top of the post is strongest and therefore the current
density in the according resonant frequency is minimal, the influence of the screw
protruding through the resonator post top end on the quality factor of the resonator
is minimal.
[0037] Figure 10 illustrates the independent control of the tuning for individual resonances
utilizing the tuning screws. This is of paramount importance in order to achieve dual-frequency
filter solutions with minimum tuning complexity comparable to the tuning complexity
of the two distinct cavity/frequency filters.
[0038] Figure 10a shows the resonant frequency normalized to resonant frequency with no
screw as a function of low-band screw penetration (mm) for low-band (solid line) and
for high-band (dashed line). As can be seen, as the low-band screw changes the resonant
frequency of the central resonant post, this has little effect on the resonant frequency
of the offset resonant post. In particular, the high-band resonant frequency remains
practically constant whereas the low-band frequency is tuned from approximately 0
- 4%.
[0039] Figure 10b shows the resonant frequency normalized to resonant frequency with no
screw as a function of high-band screw penetration (mm) for high-band (solid line)
and for low-band (dashed line). As can be seen, as the high-band screw changes the
resonant frequency of the offset resonant post, this has little effect on the resonant
frequency of the central resonant post. In particular, the low-band resonant frequency
remains practically constant whereas the high-band frequency is tuned from approximately
0 - 4%.
[0040] Such an arrangement enables a resonator in a cavity which is relatively much higher
than the resonator post is long, to be tuned mechanically and electrically in a very
effective and simple way. If implemented on both resonators, the tuning of both frequencies
from only one side is possible; if implemented in such a way that one resonator is
tuned from the top side and one from the lower side, this will reduce the density
of screws on the respective side and allow for dense resonator configurations. This
enables the construction of structures, which consist of multiple dual-resonance structures,
which are not limited in their construction by requiring any tuning mechanisms from
the side of the resonator. This allows the implementation of complex tuneable dual-resonance
structures like filters in a very compact form factor, saving volume, weight and cost.
[0041] Accordingly, it can be seen that embodiments provide an arrangement having a reduced
physical size but enabling two distinct resonant frequencies to coexist at the expense
of slightly higher manufacturing and design complexity. Through this approach, no
additional physical space is required for the high band resonant structure (
f2). Instead this is incorporated into the low band resonant structure (at
f1) without any additional physical space requirement. This provides an arrangement
which offers high Q-factor (at
f2) with no additional physical space requirements. The additional physical space of
the combined resonant structure allows for increase in the quality factor at the high
frequency regime (
f2)
. This can allow for high performance filtering; required for narrow-band filter wireless
telecommunication applications. The quality factors of the high frequency resonant
structures are higher (represent lower ohmic loses) as compared with the standalone
high filtering quality factors in the conventional filtering approaches. Also, due
to the fact that additional physical space is inherent to the resonant structure for
the high frequency, increase in the high power handling capabilities for terrestrial
communication systems can be pursued. Furthermore, although there are additional costs
of fabrication for a resonant structure at the high frequency there is an overall
cost reduction due to the fact that only one resonant cavity needs to be fabricated
instead of two.
[0042] The description and drawings merely illustrate the principles of the invention. It
will thus be appreciated that those skilled in the art will be able to devise various
arrangements that, although not explicitly described or shown herein, embody the principles
of the invention and are included within its scope. Furthermore, all examples recited
herein are principally intended expressly to be only for pedagogical purposes to aid
the reader in understanding the principles of the invention and the concepts contributed
by the inventor(s) to furthering the art, and are to be construed as being without
limitation to such specifically recited examples and conditions.
1. A resonator assembly, comprising:
a resonator having a first resonance post coaxially surrounded by a conductive enclosure
defining a cavity, said first resonance post being operable to filter a signal at
a first frequency and a second resonance post located within said cavity, said second
resonance post being operable to filter the signal at a second frequency; wherein
said first and second resonance posts are configured such that harmonics of said first
frequency fail to coincide with harmonics of said second frequency and a ratio of
said second frequency to said first frequency is not close to unity such that resonances
of the cavity at said first and second frequencies are uncoupled; and
said first resonance post is located centrally within said conductive enclosure and
said second resonance post is located away from said first resonance post and towards
said conductive enclosure; and characterised in that
said first resonance post and said second resonance post upstand from a same face
of said conductive enclosure.
2. The resonator assembly of claim 1, wherein said second frequency is greater than said
first frequency.
3. The resonator assembly of any preceding claim, wherein said first resonance post is
operable to convey a signal using a first signal feed and said second resonance post
is operable to convey a signal using a second signal feed, at least one of said first
signal feed and said second signal feed being provided through a base of said conductive
enclosure from which a respective one of said first resonance post and said second
resonance post upstands.
4. The resonator assembly of any preceding claim, wherein said first resonance post and
said second resonance post convey a signal using a common signal feed positioned between
said first resonance post and said second resonance post.
5. The resonator assembly of claim 4, wherein said common signal feed extends between
a base of said conductive enclosure from which said first resonance post and said
second resonance post upstands and a face of said conductive enclosure towards which
said first resonance post and said second resonance post upstand.
6. The resonator assembly of any preceding claim, wherein at least one of said first
resonance post and said second resonance post is configured to have a variable length.
7. The resonator assembly of any preceding claim, wherein at least one of said first
resonance post and said second resonance post comprises a first portion displaceable
with respect to a second portion to vary its length.
8. The resonator assembly of claim 7, wherein said first portion is received within said
second portion.
9. The resonator assembly of claim 7 or 8, wherein said second portion comprises a post
having a cavity extending therethrough for receiving said first portion therewithin.
10. The resonator assembly of any one of claims 7 to 9, wherein said first portion comprises
a screw received within a screw thread formed within said cavity, said first portion
being protrudable from said second portion to vary its length.
11. A filter comprising a plurality of said resonator assemblies of any preceding claim,
whereby said resonator assemblies are adjacently located and have shared portions
of said conductive enclosure, and wherein said second resonance post in each resonance
filter is located towards said shared portions of said conductive enclosure.
1. Resonatoranordnung, umfassend:
einen Resonator mit einem ersten Resonanzstab, der koaxial durch eine leitende Umhüllung
umgeben ist, die einen Hohlraum definiert, wobei der erste Resonanzstab zum Filtern
eines Signals bei einer ersten Frequenz betreibbar ist, und einem zweiten Resonanzstab,
der innerhalb des Hohlraums angeordnet ist, wobei der zweite Resonanzstab zum Filtern
des Signals bei einer zweiten Frequenz betreibbar ist; wobei
der erste und der zweite Resonanzstab so ausgebildet sind, dass die Oberwellen der
ersten Frequenz nicht mit den Oberwellen der zweiten Frequenz zusammenfallen und ein
Verhältnis der zweiten Frequenz zur ersten Frequenz nicht annähernd eins ist, sodass
die Resonanzen des Hohlraums bei der ersten und der zweiten Frequenz entkoppelt sind;
und
der erste Resonanzstab zentral innerhalb der leitenden Umhüllung angeordnet ist und
der zweite Resonanzstab von dem ersten Resonanzstab weg und in Richtung der leitenden
Umhüllung angeordnet ist; und dadurch gekennzeichnet, dass
der erste Resonanzstab und der zweite Resonanzstab von derselben Seite der leitenden
Umhüllung nach oben stehen.
2. Resonatoranordnung nach Anspruch 1, wobei die zweite Frequenz höher als die erste
Frequenz ist.
3. Resonatoranordnung nach einem vorhergehenden Anspruch, wobei der erste Resonanzstab
zum Übertragen eines Signals unter Verwendung einer ersten Signalzuführung und der
zweite Resonanzstab zum Übertragen eines Signals unter Verwendung einer zweiten Signalzuführung
betreibbar ist, wobei mindestens eine der ersten Signalzuführung und der zweiten Signalzuführung
durch eine Basis der leitenden Umhüllung bereitgestellt wird, von der ein jeweiliger
des ersten Resonanzstabs und des zweiten Resonanzstabs nach oben steht.
4. Resonatoranordnung nach einem vorhergehenden Anspruch, wobei der erste Resonanzstab
und der zweite Resonanzstab ein Signal unter Verwendung einer gemeinsamen Signalzuführung
übertragen, die zwischen dem ersten Resonanzstab und dem zweiten Resonanzstab angeordnet
ist.
5. Resonatoranordnung nach Anspruch 4, wobei sich die gemeinsame Signalzuführung zwischen
einer Basis der leitenden Umhüllung, von der der erste Resonanzstab und der zweite
Resonanzstab nach oben stehen, und einer Fläche der leitenden Umhüllung, zu der der
erste Resonanzstab und der zweite Resonanzstab nach oben stehen, erstreckt.
6. Resonatoranordnung nach einem vorhergehenden Anspruch, wobei mindestens einer des
ersten Resonanzstabs und des zweiten Resonanzstabs mit variabler Länge ausgebildet
ist.
7. Resonatoranordnung nach einem vorhergehenden Anspruch, wobei mindestens einer des
ersten und des zweiten Resonanzstabs einen ersten Abschnitt aufweist, der in Bezug
auf einen zweiten Abschnitt verschiebbar ist, um seine Länge zu verändern.
8. Resonatoranordnung nach Anspruch 7, wobei der erste Abschnitt innerhalb des zweiten
Abschnitts aufgenommen wird.
9. Resonatoranordnung nach Anspruch 7 oder 8, wobei der zweite Abschnitt einen Stab mit
einem sich durch ihn hindurch erstreckenden Hohlraum zum Aufnehmen des ersten Abschnitts
darin umfasst.
10. Resonatoranordnung nach einem der Ansprüche 7 bis 9, wobei der erste Abschnitt eine
Schraube umfasst, die in einem in dem Hohlraum ausgebildeten Gewinde aufgenommen ist,
wobei der erste Abschnitt aus dem zweiten Abschnitt vorstehbar ist, um seine Länge
zu verändern.
11. Filter, umfassend eine Vielzahl der Resonatoranordnungen nach einem vorhergehenden
Anspruch, wobei die Resonatoranordnungen nebeneinander angeordnet sind und gemeinsame
Abschnitte der leitenden Umhüllung aufweisen und wobei der zweite Resonanzstab in
jedem Resonanzfilter zu den gemeinsamen Abschnitten der leitenden Umhüllung hin angeordnet
ist.
1. Ensemble résonateur, comprenant :
un résonateur ayant une première tige de résonance entourée coaxialement par une enceinte
conductrice définissant une cavité, ladite première tige de résonance pouvant fonctionner
pour filtrer un signal à une première fréquence, et une seconde tige de résonance
située à l'intérieur de ladite cavité, ladite seconde tige de résonance pouvant fonctionner
pour filtrer le signal à une seconde fréquence ; dans lequel
lesdites première et seconde tiges de résonance sont configurées de telle sorte que
les harmoniques de ladite première fréquence ne coïncident pas avec les harmoniques
de ladite seconde fréquence et qu'un rapport de ladite seconde fréquence à ladite
première fréquence ne soit pas proche de l'unité de telle sorte que les résonances
de la cavité auxdites première et seconde fréquences ne soient pas couplées ; et
ladite première tige de résonance est située centralement à l'intérieur de ladite
enceinte conductrice et ladite seconde tige de résonance est située à distance de
ladite première tige de résonance et vers ladite enceinte conductrice ; et caractérisé en ce que
ladite première tige de résonance et ladite seconde tige de résonance se dressent
à partir d'une même face de ladite enceinte conductrice.
2. Ensemble résonateur selon la revendication 1, dans lequel ladite seconde fréquence
est supérieure à ladite première fréquence.
3. Ensemble résonateur selon l'une quelconque des revendications précédentes, dans lequel
ladite première tige de résonance peut fonctionner pour transporter un signal à l'aide
d'une première alimentation de signal et ladite seconde tige de résonance peut fonctionner
pour transporter un signal à l'aide d'une seconde alimentation de signal, au moins
une de ladite première alimentation de signal et de ladite seconde alimentation de
signal étant fournie par le biais d'une base de ladite enceinte conductrice à partir
de laquelle s'élève une tige respective de ladite première tige de résonance et de
ladite seconde tige de résonance.
4. Ensemble résonateur selon l'une quelconque des revendications précédentes, dans lequel
ladite première tige de résonance et ladite seconde tige de résonance transportent
un signal en utilisant une alimentation de signal commune positionnée entre ladite
première tige de résonance et ladite seconde tige de résonance.
5. Ensemble résonateur selon la revendication 4, dans lequel ladite alimentation de signal
commune s'étend entre une base de ladite enceinte conductrice à partir de laquelle
s'élèvent ladite première tige de résonance et ladite seconde tige de résonance et
une face de ladite enceinte conductrice vers laquelle s'élèvent ladite première tige
de résonance et ladite seconde tige de résonance.
6. Ensemble résonateur selon l'une quelconque des revendications précédentes, dans lequel
au moins une de ladite première tige de résonance et de ladite seconde tige de résonance
est configurée pour avoir une longueur variable.
7. Ensemble résonateur selon l'une quelconque des revendications précédentes, dans lequel
au moins une de ladite première tige de résonance et de ladite seconde tige de résonance
comprend une première partie déplaçable par rapport à une seconde partie pour faire
varier sa longueur.
8. Ensemble résonateur selon la revendication 7, dans lequel ladite première partie est
reçue à l'intérieur de ladite seconde partie.
9. Ensemble résonateur selon la revendication 7 ou 8, dans lequel ladite seconde partie
comprend une tige à travers laquelle s'étend une cavité pour recevoir ladite première
partie en son sein.
10. Ensemble résonateur selon l'une quelconque des revendications 7 à 9, dans lequel ladite
première partie comprend une vis reçue à l'intérieur d'un filetage formé à l'intérieur
de ladite cavité, ladite première partie pouvant dépasser de ladite seconde partie
pour faire varier sa longueur.
11. Filtre comprenant une pluralité desdits ensembles résonateurs selon l'une quelconque
des revendications précédentes, moyennant quoi lesdits ensembles résonateurs sont
situés de manière adjacente et ont des parties partagées de ladite enceinte conductrice,
et dans lequel ladite seconde tige de résonance dans chaque filtre de résonance est
située vers lesdites parties partagées de ladite enceinte conductrice.