CO-AXIAL FED MICROSTRIP RECTANGULAR PATCH ANTENNA DESIGN FOR BLUETOOTH APPLICTION

Phani Kumar TVB, Abhinay Kumar Reddy S, Aditya K, NagaRaju A

Abstract: Abstract: - A design procedure for Microstrip rectangular patch antenna for Bluetooth application is presented. In Bluetooth open wireless technology important constraints are size and installation of the antenna. In this paper the proposed antenna is designed using transmission line model and can create resonance at 2.45 GHz with in Bluetooth frequency range 2400-2485 MHz. Coaxial feed technique is used to excite the patch even though microstrip inset feed technique is present because of low radiation and ease of installation. Placement of co axial feed for this patch is taken almost one third of length from virtual ground line i.e., at the center line of the patch which is along the width lines and can creates resonance at 2.45 GHz with minimum reflection coefficient (s11) at this feed position. Fabrication is done using photolithographic technique and is tested with Agilent Network Analyzer to measure VSWR and S11 parameters. S-parameters are used to measure the antenna performance and shown that S11 value is low at resonant frequency. Variation of input impedance as function of frequency is also presented using Smith Chart. Radiation patterns are drawn both in E-plane, H-plane in anechoic chamber and parameters like gain, beam width (both E and H planes) are measured. Designed antenna is simulated on FR4 substrate with loss tangent tand=0.02 using Agilent Advance Design System (ADS) software. Simulation and measurement results are compared and discussed.

Keywords: Transmission line model, Blue tooth communications, S-parameters, VSWR, Anechoic chamber.

DOI: https://doi.org/10.15623/ijret.2013.0211090