Investigations of Multi-Resonant Wideband Null Frequency Scanning Microstrip Patch Antennas

The radiation behavior of multi-resonant wideband null frequency scanning microstrip patch antennas is studied in this paper. The relationships between the null scanning range, antenna heights and flared angles have been intensively studied and discussed. The study reveal that the antenna heights have little influence on the null scanning tendency and range, and the null scanning angle range will be widened with the increase in the flared angle while with the decrease in available radiation bandwidth (ARB). The tradeoff between ARB and null frequency scanning sensitivity (NFSS) is specifically studied. In order to obtain wider bandwidth and higher null frequency scanning sensitivity, the height and the flared angle should be carefully optimized.