Implementation and investigation of circular slot UWB antenna with dual-band-notched characteristics
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RESEARCH
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Implementation and investigation of circular slot UWB antenna with dual-band-notched characteristics Abdol Aziz Kalteh1*, Gholamreza DadashZadeh2 and Mohammad Naser-Moghadasi1
Abstract The design and analysis of an ultra wideband aperture antenna with dual-band-notched characteristics are presented. The proposed antenna consists of a circular ring exciting stub on the front side and a circular slot on the back ground plane. By utilizing a parasitic strip and a T-shaped stub on the antenna structure, two notched bands of 850 MHz (3.5-4.35 GHz) and 900 MHz (5.05-5.95 GHz) are achieved. The proposed antenna is fabricated and measured. Measured results show that this antenna operates from 2.3 GHz to upper 11 GHz for voltage standing wave ratio less than 2, except two frequency notched bands of 3.5-4.35 and 5.05-5.95 GHz. Moreover, the experimental results show that proposed antenna has stable radiation patterns and constant gain. A conceptual circuit model, which is based on the measured impedance of the proposed antenna, is also shown to investigate the dual-band-notched characteristics. Keywords: ultra-wideband antennas, microstrip slot antennas, band-notched antennas
1. Introduction Since the Federal Communications Commission (FCC) first approved rules for the commercial use of ultra wideband (UWB) in 2002 [1], the feasible design and implementation of UWB system has become a highly competitive topic in both academy and industry communities of telecommunications. Antennas are the particularly challenging aspect of UWB technology. To satisfy such a requirement, various wideband antennas have been studied [2-5]. Challenges of the feasible UWB antenna design include the UWB performances of the impedance matching and radiation stability, the compact appearance of the antenna size, and the low manufacturing cost for consumer electronics applications [6]. The UWB communication systems use the 3.1-10.6 GHz frequency band, unfortunately there are some other existing narrowband services that already occupy frequencies in the UWB band, such as the C-band (3.7-4.2 GHz) satellite communication systems and wireless local-area network (WLAN) IEEE802.11a and HIPERLAN/2 * Correspondence: [email protected] 1 Science and Research Branch, Faculty of Engineering, Islamic Azad University, Tehran, Iran Full list of author information is available at the end of the article
WLAN operating in the 5.15-5.825 GHz band. Therefore, UWB communication systems may cause unwanted interference with other co-existing communication systems. To overcome problems caused by this electromagnetic interference, various UWB antennas with single or multiple notch functions have been developed for UWB communication systems [7-14]. In this article, based on designs presented in [5,10], a circular slot UWB antenna with dual-band-notched characteristics is presented. The proposed antenna composed of circular ring exciting stub on the front side and a circular slot on the back ground plane. To achieve dual-bandnotched characteristics
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