Abstract
A novel compact broadband patch antenna for UHF (ultrahigh frequency), RFID (radio frequency identification), and GSM-900 (global system for mobile communications) band is shown in this paper. The antenna is composed of an ellipse shape annular ring at the patch. The ground plane of the planar antenna is modified with a semiellipse shape slot. The structure can generate substantial amount of current at the feed-line. The geometry of the antenna is evaluated by using HFSS simulation software and deliberated across the paper. Parametric study is exhibited to delineate the response change of the antenna. The antenna has a physical width of 0.24 λand length of 0.3 λ. It covers a frequency starting from 0.9 GHz to 1.08 GHz. A fractional bandwidth of 18.2% has been achieved from 0.9 GHz till 1.08 GHz. An average gain of 5.5 dBi is achieved at the resonance frequency. The simulated and measured results have good agreement.
Highlights
Microstrip antennas are becoming more popular in communication systems day by day
A rectangular slot is introduced in the ground plane with a circular ring at the patch in [2] to enhance the impedance bandwidth
Though the antenna evaluates quadrifilar spiral antenna (QSA) technology for RFID application, the antenna gain is as low as 0.06 dBic
Summary
Microstrip antennas are becoming more popular in communication systems day by day. With the help of cost effective substrates and different copper shapes over and under the substrate, researchers are getting new bands of interest with comparatively less complexity than other types of antennae. A rectangular slot is introduced in the ground plane with a circular ring at the patch in [2] to enhance the impedance bandwidth Another near field RFID reader antenna is exhibited in [3] to have a reading performance of about 7 cm. Circular slot is introduced to have dual frequency response in [8, 9] by using FR4 substrate This RFID reader antenna has a measured gain of 3.5 dBi at the operating frequency. The impedance characteristics of the ellipse shape antenna jump over 150 Ω at the claimed frequency with an imaginary value of –j20 Ω. In [20] an ellipse shape crescent slot broadband microstrip antenna is shown. The measured results of the antenna are shown to have good agreement with the simulated result
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