Abstract
The tunable filter with a constant bandwidth in its operating range is still needed. To meet this demand, a novel hybrid coupling structure between cavities using in tunable coaxial-cavity filters is presented in this paper. The coupling structure is constituted of rectangular window between cavities and metal rod across the cavities. Comparing to the traditional coupling structure, the combination of rectangular window and metal rod can introduce an almost constant bandwidth to the tunable filters in the operating range. In this paper, a 3rd tunable coaxial-cavity bandpass filter operating from 110MHz to 176MHz with absolute bandwidth of 1MHz is designed and simulated using EM simulation software HFSS. The simulated results indicated that the absolute bandwidth is 1.2MHz in the low frequency and 1.1MHz in the high frequency, a 1% difference exists.
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