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Paper Abstract and Keywords
Presentation 2017-05-18 11:00
A consideration on frequency control of varactor-loaded single-layer ring microstrip antennas with reduced bias circuits
Toru Ikeda, Sakuyoshi Saito, Yuichi Kimura (Saitama Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) This paper presents reduced bias circuit designs of frequency-tunable ring microstrip antennas with varactor diodes. Two varactor diodes are mounted on square ring patch antenna fed by an L-probe to realize a frequency-tunable microstrip antenna. Resonant frequency of the proposed antenna can be controlled by the DC bias voltage applied to the varactor diodes. In order to design a frequency-tunable multiband microstrip antenna with multiple ring patches, reduction of the bias circuits is important. In this paper, the bias circuit for negative bias terminal of the frequency-tunable ring microstrip antenna is replaced with a via shorting the ring patch to ground plane at the zero-voltage plane. Furthermore, upper half area of the ring patch can be removed with the via to miniaturize the ring microstrip antenna. The fractional bandwidths of the frequency-tunable range of the reduced bias circuit design and the miniaturized design are measured to be around 10% and 5% under the condition of over 3 dBi gain and the reflection less than –10 dB, respectively.
Keyword (in Japanese) (See Japanese page) 
(in English) planar antenna / microstrip antenna / multiband antenna / frequency-tunable antenna / varactor diode / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 31, AP2017-26, pp. 21-26, May 2017.
Paper # AP2017-26 
Date of Issue 2017-05-11 (AP) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee AP  
Conference Date 2017-05-18 - 2017-05-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Hotel MERIEGES 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2017-05-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A consideration on frequency control of varactor-loaded single-layer ring microstrip antennas with reduced bias circuits 
Sub Title (in English)  
Keyword(1) planar antenna  
Keyword(2) microstrip antenna  
Keyword(3) multiband antenna  
Keyword(4) frequency-tunable antenna  
Keyword(5) varactor diode  
1st Author's Name Toru Ikeda  
1st Author's Affiliation Saitama University (Saitama Univ.)
2nd Author's Name Sakuyoshi Saito  
2nd Author's Affiliation Saitama University (Saitama Univ.)
3rd Author's Name Yuichi Kimura  
3rd Author's Affiliation Saitama University (Saitama Univ.)
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Date Time 2017-05-18 11:00:00 
Presentation Time 20 
Registration for AP 
Paper # IEICE-AP2017-26 
Volume (vol) IEICE-117 
Number (no) no.31 
Page pp.21-26 
#Pages IEICE-6 
Date of Issue IEICE-AP-2017-05-11 

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