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Analysis and design of circularly polarized capacitively-fed planar suspended antenna for universal UHF RFID applications
(2020-01-01)
Boonying, Komkris
;
Phongcharoenpanich, Chuwong
This research paper deals with the design of a circularly polarized reader antenna with a tennis ball-shaped radiating plate that operates at a frequency range of 860-960 MHz with the center frequency of 910 MHz. In the fabrication of the tennis ball-shaped radiating plate, a small annular-ring slot was first created on a circular radiating plate, followed by two diagonally opposite large arc-shaped annular-ring slots on either edge of the circular radiating plate and then the truncation of the corners of the remaining main element of the plate. A prototype antenna with the final tennis ball-shaped plate was subsequently assembled prior to excitation by the capacitively coupled feed technique to enhance |S11| bandwidth. The prototype antenna could achieve an average gain of 6.18 dBic, |S11| covering the frequency range of 837.6-966.2 MHz, and the circular polarization of 850.6-963.5 MHz, making it suitable for universal UHF RFID applications. In addition, simulations were carried out using CST Microwave Studio for comparison with the experimental results.
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A 2.4-GHz dual polarized suspended square plate rectenna with inserted annular rectangular ring slot
(2016-02-01)
Phongcharoenpanich, Chuwong
;
Boonying, Komkris
This research has proposed a dual polarized suspended square plate rectenna for RF-to-DC conversion at the 2.40-2.50 GHz frequency band. The proposed dual polarized antenna yields improved isolation with an annular rectangular ring slot etched in the square radiating plate. The proposed antenna could achieve >40.00 dB isolation and >8.00 dBi gain with unidirectional radiation. The proposed SMS7630-based rectifying circuits were measured and could realize the maximum conversion efficiency of 25.98% (1.57 V) with a 3.00 kΩ resistor and 2.00 mW input RF power of a signal generator. On integration, the experimental vertical polarization rectenna was capable of achieving the maximum conversion efficiency of 21.86% (14.20 mV) at the 0.5 m distance and 0.00015.00 mW/cm<sup>2</sup> input power density. The proposed dual polarized rectenna can receive the input RF power density of arbitrary polarization with obtained average conversion efficiency of 14.97% (10.50 mV) at the 0.5 m distance of wireless local area network (WLAN) system.
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Circularly-polarized capacitively-fed UHF-RFID antenna with truncated reverse-arc shape
(2015-10-13)
Boonying, Komkris
;
Phongcharoenpanich, Chuwong
This article presents a circularly polarized (CP) flat antenna with truncated corners using the capacitively coupled feed technique for UHF RFID applications. A radiating plate, an air gap and a ground plane constitute the antenna. The reverse-arc shape truncated corners are utilized to generate a CP radiation and the suspended structure antenna using the capacitively coupled feed technique is adopted to enhance bandwidth. A prototype antenna was fabricated and its measured results were 13% for the bandwidth and 11.54% for the 3-dB axial ratio (AR) bandwidth. The half-power beamwidths of the left hand circular polarization on x-y and x-z planes were both greater than. The measured gain on the UHF RFID system was greater than 5.90 dBic.
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Planar array antenna for WPT system at 2.4 GHz
(2015-01-28)
Pookkapund, Khanet
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Boonying, Komkris
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Dentri, Sitthichai
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Phongcharoenpanich, Chuwong
This paper presents a rectifying antenna (rectenna) which can harvest the wireless power at 2.45 GHz band. The proposed antenna is designed to convert the wireless RF signal into DC power. The antenna structure consists of four printed dipoles located perpendicularly to one another to combine the pattern and increase the gain. The compact antenna radiates unidirectional pattern with the high gain. The rectifying circuit part is designed based on voltage diode with stub matching circuit.
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Polarization reconfigurable suspended antenna using RF switches and P-I-N diodes
(2014-01-01)
Boonying, Komkris
;
Phongcharoenpanich, Chuwong
;
Kosulvit, Sompol
Polarization reconfigurable square flat antenna using RF switches and P-I-N diodes is presented for WLAN application operated at the center frequency of 2.45 GHz. The proposed antenna consists of the square flat structure, three switches (six P-I-N diodes), transmission-line phase shifters of 0 and 90 degrees. The antenna can be switched between 5 different states: vertical, horizontal and slant polarizations for linear polarization (LP), left-handed circular polarization (LHCP) and right-handed circular polarization (RHCP) by controlling the DC bias of 5 V and the current of 16 mA for the P-I-N diodes. The simulated and measured results show that the proposed antenna can cover the impedance bandwidth from 2.400 GHz to 2.484 GHz and good axial ratio for the circular polarization. © 2014 IEEE.
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Dual-band circular plate antenna with annular-ring slot and four-paired rectangular slots
(2013-09-02)
Boonying, Komkris
;
Phongcharoenpanich, Chuwong
;
Kosulvit, Sompol
This paper presents dual-band circular plate antenna with an inserted annular-ring slot and four-paired rectangular slots excited by a feeding probe for RFID applications. The operating frequencies of the RFID system are 920 MHz to 925 MHz and 2.4 GHz to 2.5 GHz. It is found that at two bands, 922.5 MHz and 2.45 GHz, the S<inf>11</inf> are -14.7 dB and -23.2 dB, respectively. The radiation pattern of the proposed antenna radiates unidirectional beam with vertical polarization for both bands. The half-power beamwidths at 922.5 MHz in XZ-plane and XY-plane are 63.4 ° and 80.1 °, whereas ones at 2.45 GHz in XZ-plane and XY-plane are 35.5 ° and 57.6 °, respectively. The measured gain is higher than 5 dBi at both frequencies. © 2013 IEEE.

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