Miniaturized cavity filters based on concentric dual-coaxial SIR

Abstract

Two concentric dual-coaxial SIR filters with different structures are proposed. The first is that the upper resonant cap wraps the lower resonant cap; the second is that the cap of the upper resonator no longer wraps the lower resonator. The dual-coaxial quarter-wavelength SIR structure improves the anti-vibration capability of the resonator, and the structure makes full use of the resonator space and improves the unloaded Q value. The insertion loss of the first filter is less than 0.3 dB, and the insertion loss of the second filter is less than 1.5 dB.

KEYWORDS:

• Microwave filter
• high performance
• miniaturization
• low insertion loss

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The work was supported in part by the National Natural Science Foundation of China [grant numbers 61771094 and 62171097].