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 TE_(10) 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.