EP 1182729 A1 20020227 - TRANSMITTING AND RECEIVING ANTENNA
Title (en)
TRANSMITTING AND RECEIVING ANTENNA
Title (de)
SENDE- UND EMPFANGSANTENNE
Title (fr)
ANTENNE D'EMISSION ET DE RECEPTION
Publication
Application
Priority
JP 0001324 W 20000306
Abstract (en)
The present invention pertains to a transmitting-receiving shared antenna that is used in portable terminals for satellite communication and terrestrial communication. A varactor diode is provided in the feeder to each antenna element of a helical antenna. A transmitting-receiving shared antenna device is obtained in which the bias voltage to be applied to each varactor diode is switched between transmission and reception to thereby change the electrical length of the antenna, permitting resonance at transmitting and receiving frequencies. <IMAGE>
IPC 1-7
IPC 8 full level
H01Q 1/24 (2006.01); H01Q 1/36 (2006.01); H01Q 1/38 (2006.01); H01Q 11/08 (2006.01); H04B 1/38 (2015.01); H04B 1/3822 (2015.01)
CPC (source: EP)
H01Q 1/242 (2013.01); H01Q 1/36 (2013.01); H01Q 1/38 (2013.01); H01Q 9/14 (2013.01); H01Q 11/08 (2013.01)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1182729 A1 20020227; CN 1354899 A 20020619; JP 3669331 B2 20050706; WO 0167551 A1 20010913
DOCDB simple family (application)
EP 00906707 A 20000306; CN 00807038 A 20000306; JP 0001324 W 20000306; JP 2001566219 A 20000306