Arrangement for separating transmission and reception

Wave transmission lines and networks – Plural channel systems – Having branched circuits

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333104, 455 80, 455 83, H01P 115, H04B 144

Patent

active

055215610

ABSTRACT:
The present invention relates to an arrangement for separating transmission and reception accomplished through one and same antenna (A) in a transceiver, said arrangement comprising a filter and a switching element (K) and being provided with a common port to be coupled to the antenna (A), a transmitter branch (TX) port (T) to be coupled to the transmitter of the transceiver and a receiver branch port (RX) port (R) to be coupled to the receiver of the transceiver, and in which, as a response to a control signal, the switching element couples operationally to the common port alternatively the transmitter branch port (T) and the receiver branch port (R). The arrangement comprises a filter (S.sub.T,S.sub.F,S.sub.1,S.sub.2) including transmission line resonators, said filter being provided with adaptation couplings to be coupled to the transmission line resonators and for accomplishing couplings between the transmission line resonators. The adaptation couplings comprise an impedance adaptation circuit comprised of discrete components for adapting the filter to the antenna. The switching element (K, K.sub.T, K.sub.F) includes parts of the adaptation couplings of the filter, whereby the switching element is connected to the filter utilizing the adaptation couplings thereof and said impedance adaptation circuit is arranged in the switching element to serve as a phase shifter.

REFERENCES:
patent: 4492937 (1985-01-01), Theriault
patent: 5023935 (1991-06-01), Vancraeynest
patent: 5054114 (1991-10-01), Erickson
patent: 5109205 (1992-04-01), Hart et al.
patent: 5109536 (1992-04-01), Kommrusch
patent: 5193218 (1993-03-01), Shimo
patent: 5230090 (1993-07-01), Zametzer et al.
patent: 5241693 (1993-08-01), Kim et al.
patent: 5285177 (1994-02-01), Norose
patent: 5387886 (1995-02-01), Takalo et al.
Finnish Office Action for Application No. 944835 (with translation).

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