NDLI: Large-area varactor diode for electrically tunable, high-power UHF bandpass filter

Content Provider	IEEE Xplore Digital Library
Author	Swartz, G.A. Wern, D.W. Robinson, P.H.
Copyright Year	1963
Abstract	An electronically tunable, high-power, UHF (225-400-MHz) bandpass filter which utilizes large-area, high-capacitance varactor diodes has been designed and tested. The varactor diodes with 100-V breakdown potential, uniform impurity density in the active layer and 400-pF capacitance at -8-V bias are used as the tuning elements of the filter. The diodes are fabricated from epitaxial layers grown on high-conductivity silicon substrates. The epitaxial layers include an n⁺transition layer between the substrate and n-type active layer to minimize the growth defects in the n layer which reduce the breakdown potential to a fraction of the theoretical value. Measurements in a test cavity at 151 MHz indicate a diode Q of 190 at -8-V bias. Input power levels of 1-5 W can be accommodated across the tuning range. Insertion loss varies from 4 to 7 dB and intermodulation products are suppressed 30 dB or more for two input tones of 1 W each. This filter exhibits an order-of-magnitude improvement in power-handling capability over present state-of-the-art filters.
Sponsorship	IEEE Electron Devices Society
Starting Page	2146
Ending Page	2151
Page Count	6
File Size	853861
File Format	PDF
ISSN	00189383
Volume Number	27
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1980-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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