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Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Implementation and investigation of circular slot UWB antenna with dual-band-notched characteristics | Kalteh et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 88 EURASIP Journal on . http jwcn.eurasipjournals.eom content 2011 1 88 Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access Implementation and investigation of circular slot UWB antenna with dual-band-notched characteristics Abdol Aziz Kalteh 1 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
