International Journal of Scientific & Engineering Research, Volume 6, Issue 5, May-2015 1413 ISSN 2229-5518 IJSER © 2015 http://www.ijser.org A Novel design approach Microstrip Patch Antenna Design for Ultra wideband Applications Prashant Sarode, Shashikant S. Patil, Sachin Sonawane, Girish Patil Abstract— There are various types of Microstrip antennas that can be used for many applications in communication systems. This paper proposes the design of a Bevel Shape rectangular Microstrip patch antenna to operate in a frequency range of 1.55 GHz to 2.2 GHz. We have designed the antenna, based on a thickness of 1.6 mm, Flame Retardant 4 substrate with a dielectric constant of approximately 4.4, is a probe feed and has a partial ground plane. After mathematical design and simulation tool results, the antenna performance characteristics such as antenna VSWR and Return Loss are substantially improved. The simulation was done using Hyperlink 3D simulator software Index Terms— Microstrip Antenna, Bevel Shape, Partial Ground Plane, Operating Frequency Range, Antenna Performance Characteristics, Hyperlink 3D Simulator. ——————————  —————————— 1 INTRODUCTION ntennas play a very important role in the field of wire- less communications. Some of them are parabolic reflec- tors, patch antennas, slot antennas, and folded dipole antennas with each type having their own properties and us- age. It is perfect to classify antennas as the backbone and the driving force behind the recent advances in wireless commu- nication technology. Microstrip antenna technology began its rapid develop- ment in the late 1970s. By the early 1980s basic Microstrip an- tenna elements and arrays were fairly well establish in term of design and modeling. In the last decades printed antennas have been largely studied due to their advantages over other radiating systems, which include: light weightiness, reduced size, low cost, conformability and the ease of integration with active device. A Microstrip Patch antenna consists of a radiat- ing patch on one side of a dielectric substrate which has a ground plane on the other side. The patch is generally made of conducting material such as copper or gold. The radiating patch and the feed lines are usually photo etched on the die- lectric substrate. Microstrip patch antennas radiate primarily because of the fringing fields between the patch edge and the ground plane. In the contacting method, the RF power is fed directly to the radiating patch using a connecting element such as a Microstrip line or probe feed. In the non-contacting scheme, electromagnetic field coupling is done to transfer power between the Microstrip line and the radiating patch this includes proximity feeding and aperture feeding [11]. A Microstrip patch antenna is a radiating patch on one side of a dielectric substrate, which has a ground plane on the un- derside. The EM waves fringe off the top patch into the sub- strate, reflecting off the ground plane and radiates out into the air. Radiation occurs mostly due to the fringing field between the patch and ground. The radiation efficacy of the patch an- tenna depends largely on the permittivity of the dielectric .Ideally a thick dielectric, has low permittivity and low inser- tion loss is preferred for broadband purpose. The advantage of Microstrip antenna that are low cost, light weight and low profile .Disadvantage of Microstrip antenna is narrow band- width, low gain and polarization purity is hard to achieved. Microstrip antennas are characterized by a larger number of physical parameters than conventional microwave anten- nas. They can be designed to have many geometrical shapes and dimensions but rectangular andcircular Microstrip reso- nant patches have been used extensively in many applications. In this paper, the design of probe feed rectangular Microstrip antenna is for satellite applications is presented and is ex- pected to operate within 1GHz - 3GHz frequency span. This antenna is designed on a double sided Flame Retardant (FR-4) epoxy and its performance characteristics which include Re- turn Loss and VSWR are obtained from the simulation [11][12]. 2 BASIC CONFIGURATION In the basic configuration of the Microstrip antenna, illustrated in Fig. 1, the basic parameters like length (L) and width (W) of a Microstrip patch antenna for a required resonant frequency or vice versa and substrate parameters (εr and h) are decided. The (L/W) ratio is expected to be approximately equal to uni- ty then radiation pattern is symmetric but may not provide resonant input impedance and hence, value for W is required to be derived accordingly. W is one of the constraints for the input impedance at radiating edges [3] [12]. The antenna is design on FR4 substrate with thickness 1.6 mm and dielectric constant 4.4. The MSA is designed of primary patch with beveled shape. The beveled shape rectangular patch of dimension 30 mm x 30 mm is design on one side of FR4 substrate of thickness 1.6 mm and by following the stand- ard model, ground plane is placed on the opposite side of sub- strate. The standard coaxial probe (50 Ω) is preferred to feed the input signal to antenna. This feeding technique produces low spurious radiation. Out of three patch strips of variable length; middle strip is rectangular step shaped fractal having length 11 mm and width of 4 mm, the shorter patch is con- nected to the feed line. Accompanying strips behave like para- sitic elements and are of equal width but reducing length. Monopole antenna is generally a quarter of wavelength; hence the minimum operative frequency can be approximated by [2] [7]. A IJSER