NDLI: High-power VHF tunable filters with high selectivity

Content Provider	IET Digital Library
Author	Zhao, Zhi Yuan Chen, Jiang Yang, Lin Chen, Kun He
Abstract	A tunable helical bandpass filter with high selectivity designed for 30–88 MHz operation is presented. The two-pole tunable filter is discretely tuned by connecting PIN switched capacitor banks at the terminal ends of the helix. The filter schematic provides two finite transmission zeros located in the lower and upper stopbands, respectively. The experimental filter has an insertion loss between 1.65 and 2.75 dB with its return loss better than 13 dB. The 3-dB fractional bandwidth of the filter is 3.3%–3.7% and the shape factor (BW30 dB/BW3 dB) is smaller than 5.5 over the entire tuning range. The input power handling capability is greater than 45 dBm. The measured results show good agreement with the simulated ones.
Starting Page	1356
Ending Page	1358
Page Count	3
ISSN	00135194
Volume Number	50
e-ISSN	1350911X
Issue Number	Issue 19, Sep (2014)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/50/19
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2014.2170
Journal	Electronics Letters
Publisher Date	2014-09-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active Filter Active Network Band-pass Filter Circuit Tuning Finite Transmission Zeros Fractional Bandwidth Frequency 30 MHz to 88 MHz High-power VHF Tunable Filter Insertion Loss PIN Switched Capacitor Banks Return Loss Switched Capacitor Filter Time Varying And Switched Network Tunable Helical Bandpass Filter Two-pole Tunable Filter VHF Filter
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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