Global Patent Index - EP 0876688 B1

EP 0876688 B1 2003-06-04 - ANTENNA FOR FREQUENCIES IN EXCESS OF 200 MHz

Title (en)

ANTENNA FOR FREQUENCIES IN EXCESS OF 200 MHz

Title (de)

ANTENNE FÜR FREQUENZEN ÜBER 200 MHz

Title (fr)

ANTENNE POUR FREQUENCES SUPERIEURES A 200 MHZ

Publication

EP 0876688 B1 (EN)

Application

EP 97900334 A

Priority

  • GB 9700085 W
  • GB 9601250 A
  • GB 9610581 A

Abstract (en)

[origin: WO9727642A1] A miniature antenna (10) for operation at frequencies in excess of 200 MHz has a ceramic core (12) in the form of a cylindrical rod having a relative dielectric constant greater than 5. Plated on the outer surfaces of the core is an antenna element structure comprising a single pair of oppositely disposed helical elements (10A, 10B) having a common central axis coincident with the central axis of the core. At a distal end of the antenna, they are connected to a coaxial feeder structure passing axially through the core, and at their proximal ends they are connected to the rim of a cylindrical trap conductor (20) which, at the proximal end of the core is coupled to the screen of the feeder structure. At the operating frequency, the antenna behaves as a loop, the radiation response having nulls directed generally perpendicularly on each side of a plane containing the central axis of the core and the connections of the helical elements with the feeder structure and with the conductive sleeve. The antenna is intended primarily for a handheld communication unit such as a cellular or cordless telephone handset, the present of the nulls in the radiation pattern reducing radiation into the user's head.

IPC 1-7 (main, further and additional classification)

H01Q 1/38; H01Q 11/08

IPC 8 full level (invention and additional information)

H01Q 1/36 (2006.01); H01Q 1/24 (2006.01); H01Q 7/00 (2006.01); H01Q 11/08 (2006.01); H04B 1/38 (2006.01); H04B 7/26 (2006.01); H04M 1/02 (2006.01); H04M 1/03 (2006.01)

CPC (invention and additional information)

H01Q 11/08 (2013.01)

Designated contracting state (EPC)

AT BE CH DE DK ES FI FR IT LI NL SE

EPO simple patent family

WO 9727642 A1 19970731; AT 242550 T 20030615; AU 1391997 A 19970820; AU 720873 B2 20000615; CA 2245882 A1 19970731; CA 2245882 C 20041109; CN 1099721 C 20030122; CN 1214151 A 19990414; DE 69722590 D1 20030710; DE 69722590 T2 20040506; EP 0876688 A1 19981111; EP 0876688 B1 20030604; JP 2000506690 A 20000530; JP 4467642 B2 20100526

INPADOC legal status


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