Abstract
The microstrip antenna is one of the best antenna structures, due to its low cost and compact design. In this paper, a coaxial feed circularly polarized square patch antenna is designed using the U-slot. The proposed antenna is suited for the RFID readers in the SHF band. This structure of antenna of FR-4 substrate (dielectric constant = 3.5), is capable to cover the range of frequency of 2.4 to 2.5GHz. The size of patch is 25*25 mm2. An equivalent electrical model of this antenna was proposed and simulated by the ADS software. The simulated gain is 4.189 dBi and S11 bandwidth is about 100 MHz. Analysis and modeling of the proposed antenna was carried out using the CST and HFSS simulator based on the finite element method. The simulation results obtained are presented and discussed.
Highlights
The circular polarization was created by feeding the antenna to different locations and with a 90 ° phase shift
A U-shaped slot will be used on the patch of the coaxially fed square patch antenna
Characteristics of the proposed patch antenna were simulated using the CST software
Summary
The circular polarization was created by feeding the antenna to different locations and with a 90 ° phase shift. In addition to maintaining symmetry at the diagonal, this configuration is easier to conceive since it has a degree of freedom of less than the opening in the metallization The latter can vary in length and width while the truncation is symmetrical. An insulated slot in a patch, the addition of different slot shapes at the radiating element, such as the L-shaped slot, a T-shaped slot, an H-shaped slot and the fractals slot have been reported for large bands [5]-[9] Among these techniques, a U-shaped slot will be used on the patch of the coaxially fed square patch antenna.
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