A study of main contributors to the Out-Of-Band performance of a generic wire antenna

The Out-Of-Band (OOB) performance of a generic wire antenna, exemplified by a simple monopole, has been analysed using various antenna models. Our study showed that the low frequency gain roll off is about 55 dB/decade for wire type antenna. Across the rest of the OOB frequency band, the analytical and simulated antenna models have showed good agreement with the measured results. The main contributors for the OOB gain response for this class of antenna are mainly due to its directivity and mismatch loss.