International Journal of Advances in Engineering & Technology, May 2011. ©IJAET


ISSN: 2231-1963 DESIGN AND SIMULATION OF A DUAL BAND GAP


COUPLED ANNULAR RING MICROSTRIP ANTENNA Shuchita Saxena1 and B.K. Kanaujia2


1Department of E&C Engineering, MIT, Moradabad shuchita1210@gmail.com


2 Department of E&C Engineering, AIT, Bareilly ABSTRACT


The bandwidth enhancement technique using coplanar parasitic element is presented in this paper. This paper presents the analysis of gap coupled annular ring microstrip antenna. The proposed antenna is designed to operate at 6.2 GHz. Details of the proposed antenna and measured results are presented and discussed. The various parameters of the patch antenna are calculated and the antenna impedance is matched to 50 ohm of coaxial feed. The simulated impedance bandwidth of the proposed antenna is 4.8% for lower band (5.07-5.32 GHz) and 2.13% for higher band (6.05-6.18 GHz).


Keywords: Microstrip antenna, Gap-coupled antenna, Annular ring antenna, impedance, return loss, VSWR.


1. INTRODUCTION Although antenna engineering has a history of over 60 years, it remains as a vibrant field which is bursting with activity, and is likely to remain so in the foreseeable future. Within this field, microstrip antenna forms one of the most innovative areas of current antenna work. An antenna is an element used for radiating or receiving electromagnetic wave. Although antennas may seem to be available in numerous different shapes and sizes, they all operate according to the same basic principles of electromagnetic. Micro strip antenna consists of a path of metallization on a grounded substrate. A microstrip patch antenna is a type of antenna that offers a low profile, i.e. thin and easy manufacturability, which provides a great advantage over traditional antennas. Patch antennas are planar antennas used in wireless links and other microwave applications. The microstrip technique uses conductive strips and/or patches formed on the top surface of a thin dielectric substrate separating them from a conductive layer on the bottom surface of the substrate and constituting a ground for the line or antenna. A patch is typically wider than a strip and its shape and dimensions are important features of the antenna. Microstrip patch antennas are attractive due to their compact structure; light weight due to the absence of heavy metal stamped or machined parts, and low manufacturing cost using printed circuit technology. They also provide low profiles, conformity to surfaces and direct integration with microwave circuitry. The patch can take many different configurations. However, the rectangular and circular are the most popular because of ease of analysis and fabrication, and their attractive radiation characteristics. These antennas can be mounted on the surface of high performance aircraft, spacecraft, satellite, missiles and even hand-held mobile telephones. The annular ring microstrip antenna has been studied from a long time by a number of the investigators [1]-[4] because the bandwidth is larger as compared to the other conventional microstrip patch antenna. There are several interesting features associated with this patch. • For a given frequency, the size is substantially smaller than that of the circular patch when both operated in the lowest order mode. In application to arrays, this allows the element to be more densely situated, thereby reducing the grating-lobe problem.


• It is possible to combine the annular ring with a second microstrip element, such as another co planer parasitic antenna, to form a compact dual band antenna system.


• The separation of the mode can be controlled by the ratio of outer to inner radii. 151 Vol. 1,Issue 2,pp.151-158


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