2$\,\times\,$ 2 Switch Matrix for WiMAX Relay Station Applications

A 2
$\,\times\,$
2 Switch Matrix operating at the 3.3–3.8 GHz frequency band is presented. The design is based on PIN diode switch elements. The achieved isolation is below 80 dB, while the insertion loss is less than 2 dB for the full frequency band. The proposed 2
$\,\times\,$
2 Switch Matrix is used as the antenna switching element in the RF Front-End of a WiMAX Relay Station, supporting both Time-domain Transmit and Receive and Simultaneous Transmit and Receive operation in Time Division Duplexing mode.