A Multi-Functional Circularly Polarized All Pole Filtering Conical Horn Antenna

In this paper, we present a circularly polarized filtering conical horn antenna for aero-space communication applications. This filtering antenna basically includes the functionality of a band pass filter and a circularly polarized conical horn antenna within a single component. This not only leads to a small form factor (reduced size due to functional integration) but also eliminates additional losses like cascaded mismatch loss and hence enhancing the performance of the transceiver system. The proposed <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$4^{\text {th }}$</tex> order filtering antenna is realized at 11.2 GHz with a bandwidth of 350 MHz and realized gain of 8.1 dBi.