In this article, a double truncated circular patch (DTCP) with a defective ground structure (DGS) and having a microstrip line feed was addressed. The proposed antenna is designed to operate from 2.75 to 14 GHz (11.25 GHz spectrum). The desired antenna is printed on FR-4 substrate. A (PGP) partial ground plane with a notch was printed on the backside of the substrate to approach the ultrawideband (UWB-3.1-10.6 GHz) characteristics. The patch was truncated on the top and left sides of the circular patch to attain the characterization of UWB. The performance and characteristics of this antenna can be evaluated through reflection coefficient (S11), voltage standing wave ratio (VSWR), and radiation patterns and gain. The performance of this antenna is analyzed by using simulated results.
Objectives:The main objective of this article is to present a novel corner defected ultra wideband (UWB-3.1 to 10.6 GHz) rectangular patch with a partial ground plane to enhance the bandwidth with multi-resonance characteristics. By defecting the corners, the original rectangle patch will be converted into defected shape of proposed one to satisfy the objective. Methods: A FR-4 substrate with height (h) of 1.6 mm, dielectric constant (ε r ) of 4.3 and the loss tangent of 0.025 was used to develop the required antenna. The antenna was excited by a 50 Ohm microstrip line. This antenna was designed, simulated and analyzed by using MS-CST (Microwave Studio -Computer Simulation Technology) to attain the outcomes such as return loss (S11< -10 dB), voltage standing wave ratio (VSWR < 2), improved gain, Omni-directional radiation patterns, and enhanced bandwidth. Findings: It exhibits a fractional bandwidth (FBW) of 152.9 % between 2 GHz and 15 GHz. The antenna resonates at multiple frequencies owing to truncation of corners and produces resonant frequencies of 3.87 GHz and 11.36 GHz with the corresponding return losses of -26.03 dB and -34.87 dB respectively in the simulation point of view. The antenna was fabricated and tested. The measured and simulated results of the desired antenna were compared, and they show good agreement. Applications: The proposed antenna is suitable for UWB, WiMAX (Worldwide Interoperability for Microwave Access), C and X -band communications.
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