Wideband Design of Circular Microstrip Patch Antenna using Rectangular Metal Sheet Superstrate for X-Band Applications
Chandrashekar K S1, Chandramma S2, Halappa Gajera3, Koushik Dutta4

1Chandrashekar K S*, Dept. of Electronics, Yuvaraja’s College, University of Mysore, Mysuru, India.
2Chandramma S, Dept. of Electronics, University of Mysore, Mysuru, India.
3H. Gajera, Dept. of Studies in Electronics, PG Centre, Hemagangothri, Hassan, India.
4Koushik Dutta, Dept. of Electronics & Comm. Engineering, Netaji Subhash Engineering College, Kolkata, India.
Manuscript received on April 20, 2020. | Revised Manuscript received on April 30, 2020. | Manuscript published on May 10, 2020. | PP: 987-992 | Volume-9 Issue-7, May 2020. | Retrieval Number: G5786059720/2020©BEIESP | DOI: 10.35940/ijitee.G5786.059720
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: A wideband circular microstrip patch antenna (CMPA) has been presented employing a rectangular metal sheet superstrate. The proposed concept follows a unique, simple, and a flexible design approach to enhance the bandwidth of a circular patch. A simple change in the conventional antenna geometry has been suggested by adding a rectangular metal sheet superstrate, placed symmetrically above the patch. A cylindrical shaped foam spacer has been used to provide mechanical support to the optimized superstrate. The proposed antenna offers about 36% of impedance matching bandwidth ranging between 8.46 GHz to 12.06 GHz with a total bandwidth of 3.6 GHz. Whereas, a conventional circular patch, resonating at 9.96 GHz, hardly shows about 4.8% of impedance bandwidth (480 MHz) only. In addition to the enhanced bandwidth characteristics, the proposed antenna, also reveals a little increase in the gain throughout the operating frequency band. For the experimental validation, a set of antenna prototype has been fabricated using the commercially available dielectric substrate. The measured result is very closely agreed with the simulated predictions. 
Keywords: Microstrip patch antenna, Circular patch antenna, Wideband antenna, Wide bandwidth, Superstrate.
Scope of the Article: Smart Antenna