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Analysis and design of circularly polarized capacitively-fed planar suspended antenna for universal UHF RFID applications

Boonying Komkris, Phongcharoenpanich Chuwong

Przegląd Elektrotechniczny

2020

R. 96, nr 1

100--107

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 annularring 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.

W artykule zaprezentowano projekt anteny o kształcie piłki tenisowej pracujacej w zakresie częstotliwopści 860 – 960 MHz. Prototyp anteny pokrywał zakrs 837.6 – 966.2 MHz co spełnia wymagania uniwersalnej komunikacji UHF RFID.

Procedure to Calculate the Inductance of a Circular Loop Near a Metal Plate

Stevens N., Destrycker L., Verschelde W.

Przegląd Elektrotechniczny

2011

R. 87, nr 9a

255-258

This paper describes the influence of metallic objects on the inductance as a function of the separation distance. We focus our attention on the benchmark configuration of a circular loop antenna near an infinite conducting plate. We consider the quasi-static approach, thus with a constant current distribution over the entire loop. The results are obtained by numerical integration and the accuracy of the numerical integration procedure is verified for a circular loop antenna in free space, for which a closed analytical solution exists. The results are particularly interesting in the domain of low frequency and high frequency Radio Frequency IDentification, where mutual influence of multiple reader antennas is often suppressed by means of a metallic shielding, which results in an important decrease of the readout distance and a detuning of every reader antenna.

W artykule opisano wpływ obiektów metalowych na indukcyjność jako funkcję dystansu. Analizowano okrągłą antenę w pobliżu nieskończenie długiej metalowej płytki. Badania mają znaczenie w układach RFID gdzie liczne anteny są zakrywane przez metalowe ekrany.