Abstract
In this study a parabolic reflector antenna is designed and fabricated for IEEE 802.11a WLAN application. Initially, a single element circular tuning slot coupled Cylindrical Dielectric Resonator Antenna (CDRA) feeder is designed and fabricated for a symmetric parabolic reflector. Subsequently, the designed feeder is integrated at the focal point of the parabolic reflector to provide unidirectional radiation pattern with improved gain and sidelobe levels. The measured fractional impedance bandwidth achieved for the proposed antenna is 1.8% for S<sub>11</sub><-10 dB from 5.32 to 5.52 GHz. A radiation pattern with broadside radiation and low back radiation has been obtained. A good measurement gain of approximately 13 dB is achieved over the bandwidth by placing CDRA feeder at the focal point of the parabolic reflector. In addition, a comprehensive parametric study has been conducted to realize the effect of slot size and position on the resonance frequency of the designed feeder. Furthermore, a parametric study of various reflector parameters has also been performed to study the effect of size, depth and focal point of the parabolic reflector on gain of the antenna. Important design factors have been identified from the parametric study of the antenna. The experimental and measured results show that the designed antenna is suitable for IEEE WLAN 802.11a wireless application.
Highlights
An extensive, fast and explosive expansion in wireless communication technology and communication systems has prompted the broad use of high gain, low profile, easy to manufacture and low cost antennas
Results and discussion of Cylindrical Dielectric Resonator Antenna (CDRA) with parabolic reflector: The fabricated antenna described in Fig. 2b is constructed on the basis of the dimensions and geometrical design shown in Fig. 2a and it is measured using Agilent E8363C PNA network analyzer
The measured results produces 100 MHz (100%) more bandwidth as compared to simulated result. This deviation is due to the air gap that exists between the Cylindrical Dielectric Resonator (CDR) and the ground plane for the fabrication unit
Summary
Fast and explosive expansion in wireless communication technology and communication systems has prompted the broad use of high gain, low profile, easy to manufacture and low cost antennas. The Dielectric Resonator Antenna (DRA) has better performance over the microstrip patch antennas since it has lower conductor and surface wave losses at millimetre wave frequencies (Bijumon et al, 2007; Baba et al, 2013). Dielectric resonator antenna has several advantages which include its small size, light weight, low loss, ease of fabrication, low production cost, high radiation efficiency (>98%) and high dielectric constant. For compact size of antenna design, high permittivity of dielectric is used, for achieving the wide bandwidth operation a low permittivity of dielectric resonator is commonly utilised (Antar and Fan, 1996; Petosa et al, 1998; Nasimuddin and Esselle, 2007; Petosa, 2007; Aras et al, 2008). DRAs can be excited by different feeding techniques such as probes (Yuehe and Esselle, 2009; Huynh et al, 2011), slot (Denidni and Xian-Ling, 2009; Ohlsson et al, 2013), microstrip lines (Trabarov, 2011; Rashidian et al, 2012), dielectric image lines (Song et al, 2006; Al-Zoubi et al, 2009; Omar and Al-Hasan, 2009; Abeesh and Jayakumar, 2011) and co-planar waveguides (Omar and Al-Hasan, 2009; Abeesh and Jayakumar, 2011)
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