Design, Simulation and Implementation of the Turnstile Fractal Patch

Antenna

Guided by :Mr. Mukh Ram RajbharAssistant ProfessorECE Dept. GCET GR. Noida

Shailesh Patel (2909731009)Ravindra Singh (0809731069)Shashibhushan (0809731075)Yogendra Kumar (2909731012)

ANTENNA: That part of a transmitting or receiving system that is designed to radiate or to receive electromagnetic waves.

INTRODUCTION

Available Antennas

1. WIRE ANTENNA2. MICROSTRIP PATCH ANTENNA

Limitations of available Antennas

LARGE AVAILABLE SPACE SIZE FACTOR FEED PROBLEMS GAIN DIRECTIVITY

PROPOSED ADVANTAGES OF TURNSTILE DESIGN

SMALL SIZE WIDE BAND(Multiband ) LOW IMPEDANCE(Better matching) OPTIMIZED DESIGN STRUCTURE

Turnstile Antenna

A Turnstile Antenna  is a set of two  dipole antenna aligned at right angles to each other and fed 90 degrees out-of-phase.

Turnstile Antenna Geometry

Design FormulaAntenna length : l = (c/2 f).A Where l = length of antenna c = velocity of light f = operating frequency

A = Velocity factor(0.44-0.49)Calculated value : l = 63 mm f = 2.1 GHz

Design Parameters

Frequency 2.1 GHz

Substrate Rogers RT/duroid 5880

Dielectric Constant 4.4

Height(h) 3.2 mm

Feed type Coaxial

Software HFSS v.11

Conducting material PEC

Analysis Software Tool HFSS

HFSS : High Frequency Structure SimulatorANSOFT HFSS is the framework upon which the industry’s broadest suite of advanced engineering simulation technology is built. An innovative project schematic view ties together the entire simulation process, guiding the user every step of the way.Even complex multiphysics analyses can be performed with drag-and-drop simplicity.With bidirectional CAD connectivity, an automated project update mechanism.

Turnstile PatchAntenna

Feeding Mechanism

Reflection Coefficient(S11)

2-D Radiation Pattern at phi 0 deg and Frequency 3.6556 GHz

2-D Radiation Pattern at phi 90 deg and frequency 3.65GHz

First iteration Turnstile Fractal patch antenna

Reflection Coefficient(S11)

2-D Radiation Pattern at phi 0 deg

2-D Radiation Pattern at phi 90 deg

Second iteration Turnstile Fractal patch antenna

Reflection Coefficient (S11)

2-D Radiation Pattern at phi 0 deg

2-D Radiation Pattern at phi 90 deg

Comparison Chart

PROPOSED APPLICATIONS High Frequency Range (3.5 GHz and above) Marine Radio Determination (Radar). Government Radiolocation. Radiolocation, Speed Measuring Devices. Automatic Vehicle Identification Systems (AVIS).

CONCLUSIONS We get the unidirectional radiation pattern. Radiation becomes more uniform and directional at phi 90. Electric field strength near to feed point is more then far from the feed point.Required area in turnstile patch is lower than wire turnstile antenna, for same electric field strength..

Thank you