ELLIPTICAL PATCH ANTENNA

Submitted by:-SWATI PUGALIA

INTRODUCTION

By definition, an Antenna is a device used to transform an RF signal, traveling on conductor, into an electromagnetic wave in free space.

Antennas are broadly classified in four categories namely yagi-uda, dipole, slotted and micro strip patch antenna.

Each type of antenna has its own range of different antennas.

PROPOSED UWB ANTENNA

KEY FEATURES:-

It is a band-rejected printed elliptical antenna with a notch cut and a U-like slot fed by a simple micro strip line.

It is designed for Ultra Wideband (UWB) wireless communications with a stop-band notch in the 5-GHz HIPERLAN and WLAN bands.

To obtain sufficient matching bandwidth, a partial ground plane and notch cut are used.

To obtain the band-rejected characteristic of 5.2/5.8 GHz, the U-like slot is embedded beneath the notch cut in the elliptical patch.

ANTENNA PARAMETERS

Operating frequency = 4 & 7 GHz. Thickness of Rogers(RT/Duroid 5880)

substrate(t) =20mil. Area of antenna aperture

=35mm*35mm. Relative permittivity =3.46. Length of ground plane =12mm. Notched frequency =5.55GHz

GEOMETRY OF THE BAND-NOTCHED ANTENNA

DESIGN PARAMETERS:- Parameters

Dimensions(mm)

h 0.25

L 35

w 35

L2 12

W1 1.16

a1 9.6

a2 0.7

a3 3.55

a4 3.75

a5 1

a6 6

a7 6

b1 6

d 3.8

MEASURED ANTENNA GAIN IN VS. FREQUENCY

MEASURED RADIATION PATTERNS OF THE ANTENNA:

MEASURED SIGNAL OF IMPULSE RESPONSE OF ANTENNA

(a) Input signal and received waveforms

(b) Waveform of the received signal.

ADVANTAGES:-

Broad bandwidth and small size. Wide impedance bandwidth and Omni

directional radiation pattern. Low power consumption. High speed transmission. Simple hardware configuration.