A design of waveguide elliptic filter based on resonant diaphragms with a complex aperture |
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Authors: | Viacheslav Zemlyakov Sergey Krutiev Mikhail Tyaglov Valery Shevchenko |
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Affiliation: | 1. Faculty of Physics, Southern Federal University, Rostov-on-Don, Russia;2. School of Mathematical Sciences, Shanghai Jiao Tong University, Shanghai, China;3. Scientific Research Institute “Gradient”, Rostov-on-Don, Russia |
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Abstract: | 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. |
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Keywords: | circuit theory complex aperture computer simulation diaphragm resonators electrodynamic analysis elliptic filter microwave waveguide |
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