Improved Antenna Isolation in Transmit/Receive Applications

Systems with simultaneously operating transmitters and receivers require an excellent isolation between receive and transmit paths for preventing the transmit signal to cause saturation and intermodulation distortion in the sensitive receiver part. Furthermore, masking of the receive signal by spectral transmit signal components falling into the receive band has to be avoided. In case that frequency bands for transmit (TX) and receive (RX) are sufficiently wide separated in frequency, bandpass filters and/or filter duplexers are used to provide the required isolation.