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A Circular Patch Dual Band Circularly Polarized

Pentagonal Slot Antenna for Mobile Communication

System

Introduction:

Microstrip antennas are widely used as an efficient radiator in many communication systems.

One of the most interesting applications is their use for transmitting or receiving systems,

required for circular polarisation.

Many types of antennas are used for mobile satellite communications to enable airplanes,ships and vehicles to maintain communication link. Such systems require circularly polarized

antennas. Microstrip patch antennas are of great interest for mobile communicationapplications due to their thin and compact structures. The flexibility afforded by microstrip

antenna technology has led to a wide variety of designs and techniques. The usability ofcircularly polarized microstrip antennas in mobile systems is limited by their narrow axial

ratio bandwidth. Several impedance bandwidth enhancement techniques are available in open

literature. However, not many antenna configurations exist in literature for obtaining a wide

ellipticity bandwidth and is still a challenging task.

The ring antenna is very attractive because wireless communication systems usually require

smaller device size in order to meet circuit miniaturization and cost reduction. The radiation

characteristics of a ring slot microstrip antenna are complementary to those of a ringmicrostrip antenna with electric and magnetic field interchanged using Babinets principle.

Slot microstrip antennas are usually designed for a linear polarization. However, the

circularly polarized antennas are attracting much attention in recent years. In someapplications such as satellite communication systems, a circular polarization (CP) antenna is

more suitable because of its insensitivity to transmitter and receiver orientations. They are

also used in radar to reduce the clutter from spherically symmetric objects like raindrops,

hail, etc.. For the design of the single-feed ring slot microstrip antenna with CP operation,

generally the required two orthogonal modes with equal amplitude and 90 phase difference

can be excited by dual feeding, by protruding a tuning stub, and by a pair of perturbations,

which is located at one of diagonals.

Objective of the proposed research work :

The objective of the proposed research work is as following:a) To design dual-band circularly polarized pentagonal slot antenna on circular patch

using coaxial feedtechnique.b) Use of circular patch for improved return loss and improved axial ratio.c) To increase the compactness of the proposed antenna using circular patch.d) To demonstrate a novel pentagonal slot antenna that can be applied into dual-band CP

operation.

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Proposed Antenna Design:

Software to be used:

Following software will be used in the proposed research work :

a) Ansoft HFSS Version-13b) Zealand ie3d Version-9

References:

1) J. R. James, P. S. Hall, and C. Wood, Microstrip Antenna Theory and Design.London, U.K.: Peregrinus, 1981.

2)

W.-S. Chen, C.-K. Wu, and K.-L. Wong, Square-ring microstrip antenna with a crossstrip for compact circular polarization operation, IEEE Trans. Antennas Propag.,

vol. 47, no. 10, pp. 15661568, Oct. 1999.

3) Antenna Theory Analysis and Design, second edition by C. A. Balanis, John Wiley &Sons, Inc.

4) A. Hakim, C. Laurent, G. Marjorie, L. Jean-Marc, and P. Odile, Reconfigurablecircularly polarized antenna for short-range communication systems, IEEE Trans.

Antennas Propag., vol. 54, no. 6, pp. 28562863, Jun. 2006.

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GANNT Chart for the proposed dissertation work: