Reducing the Size of UMTS Microstrip Antennas

to integrate them in Mobile Stations

 

Réduction de la Taille des Antennes Microstrip UMTS

pour les Intégrer  dans les Stations Mobile

 

A. Latif1*, R. Hilal2, A. Ait Ouahman1

1National School of Applied Sciences, Cadi Ayyad University, Morocco,

BP575 Avenue Abdelkarim   Khattabi,,Guéliz, Marrakech

2 Cadi Ayyad University, Marrakesh, Morocco,

* Corresponding author. E-mail: latif_adnane@yahoo.fr

Received: 02 August 2008; revised version accepted:11 November 2008

 

Abstract

     In this work we propose a simple technique permitting to reduce the size of the conventional patch antenna of 75%: it is the folding technique. Indeed, while bending a quarter patch antenna of oblong wave, the length of the antenna can be reduced to lg/8. The aim of this paper is to study the miniature patch antenna fed by a coaxial line, and the design comparison of this antenna by two methods: The Transmission Line Model (TLM) and the G-L-C Parallel Circuit Model. An adaptation of the microstrip antenna l/8, by the setting up of a capacitor in the middle of the probe-feed is achieved. The modeling and the design of the miniature patch antenna will be made by the TLM; a particular attention will be carried on the results got on the level of the bandwidth. The second part is based on the idea of microstrip patch antenna starting from the G-L-C Parallel Circuit Model, (by order of 14 %), which gives the bandwidth more interest than the first method (TLM). The results obtained by the two methods (Input Impedance, reflection coefficient, SWR and bandwidth) will be given by the programs in MATLAB software.

 

Keywords: Microstrip Patch antennas; Reduction Size; Design of antennas; UMTS Antennas.

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