Switchable duplex filter

Details Switchable duplex filter Switchable duplex filter

1996-11-22

1998-09-29

Ham, Seungsook

Wave transmission lines and networks

Plural channel systems

Having branched circuits

333132, 333134, 333206, H01P 512, H01P 1202

Patent

active

058150480

ABSTRACT:
A radio frequency filter has a band-pass type frequency response which is controllable in a manner such that the frequency response may be moved between the transmission frequency (TX') and reception frequency (RX') of associated radio equipment. Thus the radio frequency filter may be used both as a transmission filter and as receiving filter, provided that the transmission and reception take place at different times. The radio frequency filter includes a change-over switch, which connects the radio frequency filter to a transmitter when the pass band of the radio frequency filter is in the transmission frequency, and which connects to the receiver when the pass band of the radio frequency filter is in the reception frequency.

REFERENCES:
patent: 5023935 (1991-06-01), Vancraeynest
patent: 5387886 (1995-02-01), Takalo et al.
patent: 5515017 (1996-05-01), Yamada et al.
patent: 5541560 (1996-07-01), Turunen et al.

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