Abstract
This paper presents air gap aperture coupled microstrip antenna for dual-band operation over the frequency range of (2.9 to 6.0 GHz). This antenna differs from any other microstrip antenna with their feeding structure of the radiating patch element. Input signal couples to the radiating patch trough the aperture that exists on the ground plane of microstrip feed line. The dual-band achieved by variation of air gap [2 mm to 6 mm] between single patch antenna and aper-ture coupled microstrip antenna. The main advantage of this type antenna is increased the bandwidth of the antenna as compared to a single layered patch antenna. The two resonant frequencies can vary over a wide frequency range and the input impedance is easily matched for both frequencies. The obtain ratios of resonance frequencies are variable from 2.1 GHz to 1.1 GHz with increasing the air gap between single patch and aperture coupled microstrip antenna. The measured return loss [–14 dB] exhibits an impedance bandwidth of 35%. The input impedance and VSWR return loss have been measured with the help of Network analyzer.
Highlights
The use of microstrip antenna has become quit popular because of their properties such as low profile, light weight, compact [1]
This paper presents air gap aperture coupled microstrip antenna for dual-band operation over the frequency range of (2.9 to 6.0 GHz)
The dual-band achieved by variation of air gap [2 mm to 6 mm] between single patch antenna and aperture coupled microstrip antenna
Summary
The use of microstrip antenna has become quit popular because of their properties such as low profile, light weight, compact [1]. The aperture coupled microstrip antenna first proposed by Pozar [2] in 1985 has a number of advantages over other feeding method involving galvanic contact between the antenna and feed line. The idea is introduce an air gap variation between the single patch and aperture coupled microstrip antenna. The air gap variations affect the resonant frequencies. The resonant frequencies can be tuned by the variation of air gap. A transmission line [9] and cavity model [10] have been proposed as efficiently analysis and design method. In this paper a simple but accurate design method from air gap aperture microstrip antenna is presented. The dual-band operation of air gap aperture coupled microstrip antenna are useful in many application such as dual-band transmit receive models for space vehicles
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