A design of waveguide elliptic filter based on resonant diaphragms with a complex aperture

作者：Zemlyakov, Viacheslav^*; Krutiev, Sergey; Tyaglov, Mikhail; Shevchenko, Valery

来源：International Journal of Circuit Theory and Applications, 2019, 47(1): 55-64.

DOI：10.1002/cta.2566

• circuit theory
• complex aperture
• computer simulation
• diaphragm resonators
• electrodynamic analysis
• elliptic filter
• microwave waveguide

A novel approach to the synthesis of waveguide band-pass elliptic filters on the transverse metal resonant diaphragms with the complex aperture is proposed. The aperture of the diaphragm is considered to be a rectangular window with two L-shaped metal ridges. For the complex conductivity of the diaphragm, we solve the corresponding electrodynamic problem. We also construct and investigate an equivalent circuit of the resonant diaphragm containing a series-parallel LC circuit. The geometry of the diaphragm aperture is found to be corresponding to the parameters of the equivalent circuit. We construct a third-order elliptic filter and provide a computer simulation of the diaphragms satisfying the amplitude-frequency characteristics of its resonators. We show that some resonators can be located on one complex resonant diaphragm, which then reduces the length of the filter. The band-pass filter for a rectangular waveguide WR137 is developed and manufactured. The central frequency of the filter is 6.6 GHz, the passband width 7.5 % with return loss of -20 dB, and the total length is 34 mm.

• 出版日期2019-1
• 单位上海交通大学