Abstract

This paper presents a tri-band bandpass filter with high design flexibility in symmetrical structure and a wide stopband by using quad-mode stub loaded resonator. Stub-to-stub coupling is introduced to split two identical modes and produce two transmission zeros. The harmonic passband can be typically eliminated by regularly embedding open-circuited stubs in the feeding structure without affecting the performance of the three passbands. A filter prototype is simulated to validate the proposed design. The results show a desired wide upper stopband at 8.8 GHz with rejection better than 20 dB and three passbands are centered at 2.45 GHz, 3.68 GHz, and 5.19 GHz respectively, which is applicable to WLAN and WiMAX applications.

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