(19)
(11) EP 2 273 605 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.03.2011 Bulletin 2011/12

(43) Date of publication A2:
12.01.2011 Bulletin 2011/02

(21) Application number: 10181791.4

(22) Date of filing: 07.04.2004
(51) International Patent Classification (IPC): 
H01P 5/10(2006.01)
(84) Designated Contracting States:
DE SE

(62) Application number of the earlier application in accordance with Art. 76 EPC:
04821964.6 / 1735870

(71) Applicant: Raytheon Company
Waltham, MA 02451-1449 (US)

(72) Inventor:
  • Essenwanger, Kenneth A.
    Walnut, 91789, CA 91789 (US)

(74) Representative: Witte, Weller & Partner 
Postfach 10 54 62
70047 Stuttgart
70047 Stuttgart (DE)

   


(54) Compact balun for rejecting common mode electromagnetic fields


(57) A space-efficient broadband balun (20") comprising first mechanism (94, 96) for receiving an input signal (52, 54) having an undesirable component, wherein the undesirable component is a common mode component, said first mechanism (94, 96) comprising first (94) and second (96) coaxial waveguides; second mechanism (50, 78, 98) for rejecting the undesirable component via a waveguide transition (50, 78 98), wherein the waveguide transition (98) includes a dual coax-to-coplanar waveguide-to-single coax transition (98), wherein the coplanar waveguide is formed from a first slotline (114) and a second slotline (116), the first slotline (114) being formed between an outer conductor (122) and a center conductor (118) of an output coaxial cable (120) and between an outer conductor (110) and an inner conductor (112) of the first coaxial waveguide (94), and the second slotline being formed between an outer conductor (122) and a center conductor (118) of the output coaxial cable (120) and between the outer conductor (110) and the inner conductor (112) of the second coaxial waveguide (96), and the waveguide transition (98) includes a resistor network (100) to facilitate load matching; wherein an end of the coaxial output cable (120) provides an output of the balun (20), and the input signal (52, 54) includes a first input signal (52) and a second input signal (54), which are input at ends of the first (94) and second (96) coaxial waveguides the first input signal (52) and the second input signal (54) having a desired differential mode component and an undesired common mode component.







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