Abstract
In this paper, an inverted suspended circular patch with square slot design is proposed for broadband circular polarized antenna. The antenna was designed based on L-probe technique and air gap of 10 mm distance between substrate and copper ground. L-probe technique is used in this antenna design to feed the 50 Ohm SMA connector signal through the feedline to the antenna structure. The proposed antenna had been designed and simulated by using computer simulation technology (CST) software. This antenna design is targeted for wireless local area network (WLAN) application which operating frequency at 2.4 GHz. Antenna performances in term of return loss, resonant frequency, bandwidth, gain, axial ratio, directivity, total efficiency and radiation pattern at the design frequency are analyzed. Result of simulation show that the proposed antenna achieved axial ratio below 3 dB which is 0.62 dB with return loss -35.60 dB at targeted frequency. Comparison result of simulation and measurement show that the return loss bandwidth (RLBW) and realized gain of the antenna at 2.4 GHz frequency decreases from 556 MHz to 354 MHz with gain 7.76 dB to 4.54 dB. However, the proposed antenna covers a wider bandwidth of 2.4 GHz where both simulation and measurement bandwidth is over 350 MHz.
Highlights
Microstrip patch antennas have been widely used due to their advantages of low profile, ease of fabrication, inexpensive, light weight and ease of integration with active Radio Frequency (RF) devices [1]
The resonant frequency of the simulation result is at 2.398 GHz with -35.8 dB return loss, while the measurement result shifts a little bit to higher frequency which is at 2.42 GHz with return loss dropped slightly to -21.5 dB
This might be due to the reduction of return loss for measurement result at 2.4 GHz from -35.6 dB to -20.3 dB which is around -15.3 dB less compared to the simulation result
Summary
Microstrip patch antennas have been widely used due to their advantages of low profile, ease of fabrication, inexpensive, light weight and ease of integration with active Radio Frequency (RF) devices [1]. The basic and most commonly shape used to design microstrip antenna is the rectangular patch antenna. Instead of rectangular is the basic and most commonly used shape, microstrip patch antenna could be in lot of various shapes such as circular, square, elliptical and triangular [3]. The major advantage of L-probe fed is the ability of the design to improve bandwidth no less than 5% from its centre frequency [7] while keeping reasonable radiation properties. Microstrip patch antenna in their basic form normally provides linear polarization, but by certain modification it can provide circular polarization. The circular polarized antenna can be obtained by using single or double feed [1,14], truncated corner [2,15], slot [15], double layer. The proposed circular patch antenna was designed for circular polarization at 2.4 GHz frequency
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