DGS Based Coaxially Fed Microstrip Slotted Rectangular Patch Antenna with Improved Gain and Bandwidth
Keywords:Defected ground structures, coaxially fed, slotted patch geometry, multiband operation
Most often, the conventional microstrip rectangular patch antennas have a limited gain and bandwidth performance. In this paper, an enhancement in the gain and bandwidth parameters are achieved by slotted radiating patch and using a defected ground structure respectively. The proposed antenna design with design frequency of 3.5 GHz has been evolved isometrically in different design stages (design iterations). The work initially considers an existing single band Microstrip rectangular patch antenna design of low gain and another work of single band antenna with a slotted patch geometry offering an improved gain but limited in its bandwidth. The change in the widths of the ground, substrate and the patch along with the addition of addition of slots into this design results into a completely different geometry featuring multiband operation with an improved gain and the use of defected ground structure in the final stage counters the limited bandwidth operability. All the involved iteration designs have been simulated over HFSS-15 for the performance parameters of the reflection coefficient, bandwidth, radiation pattern and gain. The designs of the last two stages have been fabricated and validated. The measured results have been found to be in close approximation to the simulated ones.
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