Patent ID: 9668300
Date: 2017-05-30
CPC Classifications: H04B,H04L,H04W

Claim:
1. A portable radio, comprising: a long term evolution (LTE) transceiver having an LTE receive (RX) path and an LTE transmit (TX) path for operation in full duplex mode; a land mobile radio (LMR) transceiver having an LMR transmit (TX) path and an LMR receive (RX) path for operation in half-duplex mode; an LTE antenna; an LMR antenna; a linear duplexer coupled to the LTE antenna; first and second surface acoustic wave (SAW) filters coupled to the linear duplexer, the first SAW filter implemented as a duplexer with one port terminated to provide a filter for the LTE RX path of the portable radio, the second SAW filter implemented as a duplexer with one port terminated to provide a filter in the LTE TX transmit path of the portable radio; and the linear duplexer and first SAW filter for filtering an LMR TX signal and an LTE TX signal which are simultaneously present at the LTE antenna, the linear duplexer and first SAW filter combining to eliminate intermodulation spurs before they are generated in an active LTE RX path; and wherein the linear duplexer lowers the signal levels of the simultaneously present LMR TX signal and LTE TX signal beneath predetermined threshold levels, the first SAW filter filtering the lower level LMR TX and LTE TX signals without generating spurious emissions above an acceptable level.