Fatemeh Kazemi - University of zabol

In this paper, a dual-polarized antenna fed by CPW is presented. The proposed includes a conductor on the ‎radiator and has defected ground, so it has been achieved as an omnidirectional antenna which makes it a low loss, ‎and a simple antenna which is appropriate for a wireless communication system. By imposing the different ‎circumstances of U-shape elements on the ground, the features of antennas have been improved. The scattering ‎characteristic of the antenna are less than -۲۰ dB with high impedance matching at ۲.۲GHz, ۴.۸GHz, and ۶.۶GHz. ‎Also, the antenna covers ۴۰۰ MHz bandwidth from ۲ GHz to ۲.۴ GHz, ۵۰۰ MHz bandwidth from ۴.۶ GHz to ۵.۱ GHz, ‎and ۱.۳ GHz bandwidth from ۵.۷ GHz to ۷ GHz, respectively. In addition, the maximum gain of the antenna is almost ‎‎۱۰ dB. The simple and compact antenna with an overall size of ۲۵x۲۰mm۲ is designed on an FR-۴ substrate with ۰.۸ ‎mm thickness. On the one hand, the structure is fabricated and tested. The results of the antenna have shown that ‎the measured results agree with the simulated results; The performance of the antenna with CPW-fed, consisting of ‎compact size, circular polarization, and suitable gain at resonance frequencies, make it a suitable choice for the ‎communication system and the portable device.‎

Small Antenna, Parasitic Elements, Circular Polarization, Wireless Communication Systems