K-band 4 th -order Tunable Filter Using Dual TE 211 Mode and TE 011 Mode

In this paper, a 4th-order K-band tunable cavity resonator filter is introduced. The tunable filter uses a dual TE211 mode cavity to reduce the size and the mass of the filter. To improve selectivity, two TE011 mode cavities are coupled to the duel TE211 modes. The concept, design, and test results are presented.