High Power VHF Frequency-hopping Filters With High Suppression of Second Harmonic

摘要：

A compact helix structure implementation and associated design formula of lumped element secondorder 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 hens 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 return loss better than 15dB, a 3-dB bandwidth of 5％ ～8.5％ over entire operating range with the power handling capability greater than 49dBm and the suppression of second harmonic better than 56dB. Z

关键词： frequency-hopping helical bandpass filter high power handling capability suppression of second harmonic

作者: ZHAO Zhi-yuan LI Ping-hui CHEN Kun-he CHENG Kun-lun CAO Wen-quan

作者单位: ICE, PLAUST, Nanjing 210007, China The 63rd Research Institute of the PLA GSH, Nanjing 210007, China

会议类型: 国际会议

会议名称: 2011 China-Japan Joint Microwave Conference(2011年中日微波会议CJMW 2011)

会议地点: 杭州

会议语种:英文

页码: 433-436

在线出版日期: 2011-04-20（万方平台首次上网日期，不代表论文的发表时间）