Lk Products Oy

Panu Hagstrom

Seppo Yrjola

The object of the invention is a radio communication transceiver, in which the low noise pre-amplifier and mixer of the receiver and the power amplifier, directional coupler and the mixer of the transmitter are integrated in connection with the filter section. The active components are integrated with the filter so that the entity forms one component on the circuit board of the telephone.

Radio communications transceiver with integrated filter, antenna switch,

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.

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Oulu, Finland

Panu Hagstrom