Abstract
2 Abstract: Microstrip patch antennas represent one family of compact antennas that offer a conformal nature and the capability of ready integration with communication system's printed circuitry. In this paper, a microst rip antenna has been designed at 1.9GHz using ANSOFT-HFSS. By varying the feed point, good value of return loss is obtained and optimum position of feed point and the bandwidth are also determined. Microstrip antennas are used in high performance aircraft, spacecraft, satellite and missile application, where size, weight, cost, performance, ease of installation and aerodynamic profile are constraints (1). Presently there are many government and commercial applications of microstrip antennas such as mobile radio and wireless communications. Microstrip antennas however have limitations in terms of bandwidth and efficiency, all imposed by the presence of dielectric substrate? A modified rectangular patch antenna with an air gap in between the two substrate layers of patch is analyzed to achieve compact size, light weight and wide band operation (2). There are many configurations that can be used to feed microstrip antennas. The four most popular are microstrip line, coaxial probe, aperture coupling and proximity coupling (3). Coaxial feed method is widely used because of its simplicity in fabrication and matching and it has low spurious radiation. Matching may be achieved by properly selecting the location of the feed may also affect the radiation characteristics. In view of this, an attempt has been made to determine the optimum feed position of microstrip antenna designed at 1.9GHz. Optimum feed position can be obtained by finding the Return loss (4). Because Return loss is convenient way to characterize the input and output of signal sources. In other words, when the load is mismatched, not all the available power from generator is delivered to the load. This loss is termed as return loss and is expressed in dB. There are many methods of analysis for microstrip antennas. Most popular models are Transmission Line Model (TLM), cavity and full wave. In this paper, a compact rectangular microstrip patch antenna for use in cellular phones is designed using HFSS. II. DESIGN PROCEDURE The essential parameters for the design are resonant frequency f0=1.9GHz, dielectric constant of the material is er= 11.5 and height of the substrate is 1.3mm. . Fig 1. Top view of Microstrip Patch Antenna in HFSS.
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