volume | PIER Journals

2011-01-27

High Power VHF Frequency-Hopping Filters with High Suppression of Second Harmonic

Zhi-Yuan Zhao,

Dr. Zhi-Yuan Zhao

PLA University of Science and Technology

China

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Ping-Hui Li,

Professor Ping-Hui Li

PLA University of Science and Technology

China

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Kun-Lun Cheng,

Dr. Kun-Lun Cheng

PLA University of Science and Technology

China

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Wen-Quan Cao,

Professor Wen-Quan Cao

PLA University of Science and Technology

China

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Kun-He Chen

Dr. Kun-He Chen

The 63rd Research Institute of the PLA GSH

China

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Progress In Electromagnetics Research Letters, Vol. 20, 119-128, 2011

doi:10.2528/PIERL10122002

Abstract

A compact helix structure implementation and associated design formula of lumped element second-order bandpass filter circuit for high power frequency-hopping filter are proposed in this paper. The filter schematic provides one, two or three finite transmission zeros (Tzs), and these Tzs locates in the upper stopband to improve the rejection above the center frequency, especially the suppression of second harmonic with two Tzs. The filter schematic is built on a common grounded helix coil of inductive coupled resonator tanks whose suspectance is tunable. Due to the parasitical capacitance of the helix coil, the filter has a feedback capacitor between input and output. Its working mechanism is revealed both mathematically and graphically. The measured results have a good agreement with the 3D full-wave electromagnetic simulation responses. The experimental filter has a insert loss < 1.5 dB , return loss > 15 dB, a 3-dB bandwidth of 5%~8.5% over entire operating range with the power handling capability greater than 49 dBm and the suppression of second harmonic better than 56 dB.

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Zhi-Yuan Zhao, Ping-Hui Li, Kun-Lun Cheng, Wen-Quan Cao, and Kun-He Chen, "High Power VHF Frequency-Hopping Filters with High Suppression of Second Harmonic," Progress In Electromagnetics Research Letters, Vol. 20, 119-128, 2011.
doi:10.2528/PIERL10122002

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