Radio frequency circuit for portable radion communication device

Details Radio frequency circuit for portable radion communication device Radio frequency circuit for portable radion communication device

1996-06-26

1998-02-03

Chin, Tommy P.

Telecommunications

Transmitter

Diversity

455133, 455 78, 455134, 455135, 4552771, 455275, H04B 156

Patent

active

057155259

ABSTRACT:
Band-pass filters BPF1, BPF2, and BPF3 correspond to the reception frequency band for FDD, the transmission band for FDD, and the band for TDD, respectively. An antenna A1 is used in common for transmission and reception in the FDD and TDD systems. Another antenna A2 is used for diversity reception in the FDD system. A controller 20 controls switches SW1 through SW4. When the FDD system is selected, the reception signal is sent from the antenna A1 or A2 through the filter BPF1 to a reception amplifier RA, and the transmission signal is sent from the transmission amplifier TA through the filter BPF2 to the antenna A1. When the TDD system is selected, the reception signal is sent from the antenna A1 through the filter BPF3 to the reception amplifier RA, and the transmission signal is sent from the transmission amplifier TA through the filter BPF3 to the antenna A1.

REFERENCES:
patent: 4876743 (1989-10-01), Lindenmeier et al.
patent: 4914714 (1990-04-01), Tamura
patent: 5159707 (1992-10-01), Mogi et al.
patent: 5276920 (1994-01-01), Kuisma
patent: 5444745 (1995-08-01), Ali-Vehmas
patent: 5465409 (1995-11-01), Borras et al.
patent: 5475677 (1995-12-01), Arnold et al.
patent: 5491723 (1996-02-01), Dipestraten

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