DESIGN OF BROADBAND HORN ANTENNA WITH HIGHER- ORDER MODE SUPPRESSOR

摘要

In this paper, we designed a double-ridged horn antenna with the higher-order mode suppressor (HOMS). The cylindrical metal posts were inserted into the double-ridged waveguide (DRW) to suppress the higher-order (TE, not TM) mode and covert it into TE_(10) dominant mode. The TE_(30) mode of the horn antenna was almost suppressed and its insertion loss was more than 40 dB in the operating frequency range. The peak radiation gain range of TE10 mode with HOMS is almost identical with that of the antenna without HOMS. And the radiation patterns of TE_(30) mode in the designed antenna are very similar to those of the TE_(10) mode in a conventional horn antenna.