Abstract
Producing a suitable impedance matching between the radiating element and the feedline is the prior hurdle to overcome for a wideband antenna with circular polarisation designs. This study presents a novel antenna consisting of a defected ground structure (DGS) and a crescent-slot radiating patch for broad impedance bandwidth. In addition, a narrow rectangular slot was etched on the ground plane for antenna compactness and outcomes improvement. In order to examine the reliability, two different numerical softwares were compared based on the antenna’s basic structure. Apart from this, an equivalent circuit of the proposed prototype is modelled logically using ADS 2016. The numerical results demonstrate that the impedance bandwidth was about 74.6% for < −10 dB, while the 3 dB axial ratio bandwidth greater than 53% was achieved. In the operational bandwidth of the design, good impedance matching and high efficiency were seen, which shows that this design is appropriate for modern wireless communication systems in ISM and GSM bands.
Highlights
Circular polarisation (CP) is well known due to its attractive attributes in particular wideband antenna designs
To upgrade the antenna’s operational structure and ensure that optimum performance is achieved, numerous research works have been carried out using various recommended methods associated to CP features, which improved the antenna’s bandwidth
An open loop radiator fed with CPW [2], circulartapered fed sleeve [3], and C-shape radiator [4] were used
Summary
Circular polarisation (CP) is well known due to its attractive attributes in particular wideband antenna designs. In the aspect of reconfigurable antennas, switching ability from multiband to wideband mode has been performed and demonstrated in [7] Another design included two symmetrical slots that were fed with the help of a forkshaped microstrip line; once reconfigured, a broadband range was obtained [8]. This could result in undesired resonant frequencies where harmonics are generated due to the nonlinearity of PIN diode. In [15], it has been demonstrated that DGS has a positive association with a band notch filter as it rejected the undesirable higher or lower frequency mode of the resonator. A table of comparison showing the differences between the proposed works with the previously reported work has been presented
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