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Paper Abstract and Keywords
Presentation 2014-05-29 11:10
Evaluation of Reception Properties of ESPAR Antenna with Periodically Variable Directivity
Yusuke Idoguchi, Masato Saito (Ryukyu Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) In this study, we made prototypes of ESPAR (Electronically Steerable Passive Array Radiator) antennas whose directivity can periodically change and measured characteristics of the antennas. The antenna pattern of the
antennas can be time-variable according to the incurred voltage of dc and sinusoidal waveform to the variable reactance which is connected to the parasitic element of the antennas. The periodically variable directivity can make the received signal components frequency-shifted according to the frequency of the sinusoidal waveform. The multiple received signals in different frequencies can be utilized as diversity branches to obtain diversity gain. According to the experimental results we can see that the antenna can provide time-variable antenna patterns with different phase to the received signals from opposite directions. Besides, we could increase the power of frequency-shifted components by increasing the antenna pattern variation. As a conclusion, the prototypes can contribute to realize the diversity of combined antenna pattern and path and to improve the diversity gain.
Keyword (in Japanese) (See Japanese page) 
(in English) ESPAR antenna / time-variable antenna pattern / antenna pattern diversity / path diversity / / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 62, AP2014-22, pp. 17-22, May 2014.
Paper # AP2014-22 
Date of Issue 2014-05-22 (AP) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee AP  
Conference Date 2014-05-29 - 2014-05-30 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa Industory Support Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Antennas and Propagation 
Paper Information
Registration To AP 
Conference Code 2014-05-AP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Evaluation of Reception Properties of ESPAR Antenna with Periodically Variable Directivity 
Sub Title (in English)  
Keyword(1) ESPAR antenna  
Keyword(2) time-variable antenna pattern  
Keyword(3) antenna pattern diversity  
Keyword(4) path diversity  
1st Author's Name Yusuke Idoguchi  
1st Author's Affiliation University of the Ryukyus (Ryukyu Univ.)
2nd Author's Name Masato Saito  
2nd Author's Affiliation University of the Ryukyus (Ryukyu Univ.)
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Date Time 2014-05-29 11:10:00 
Presentation Time 25 
Registration for AP 
Paper # IEICE-AP2014-22 
Volume (vol) IEICE-114 
Number (no) no.62 
Page pp.17-22 
#Pages IEICE-6 
Date of Issue IEICE-AP-2014-05-22 

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