broadband patch antenna design new

8/8/2019 Broadband Patch Antenna Design New

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Under the guidance of

Prof: Golak Santra Erla. Rajesh

p08ec905



Over viewy I tr cti

y Micr stri atc a te a

y Desi r ce re f sim le ecta lar Micr stri

A te a

y Br a ba i tec iq es

y F t re w r



Introduction to road and patch antenna

y Growth of personal co unication ser vice devices

(PCS) fro o ile phone to WL N.

y Wide variety of applications like we and ulti edia

essaging.

y Increasing popularity of WL N leads to develop ent

of road and antenna



Structure of rectangular icro strip patch antenna



Antenna perfor ance para eters

y Radiation pattern

y irectivity

y Input i pedance

y Voltage Standing Wave Ratio (VSWR)

y Return loss



Co on Shapes of icrostrip Ele ents



Advantages:

y

Light weight and lowv

olu e.y Low profile planar configuration which can e easily

ade confor al to host surface.

y Low fa rication cost, hence can e anufactured in

large uantities.

y Supports oth, linear as well as circular polarization.

y Can e easily integrated with icrowave integrated

circuits ( ICs).y Capa le of dual and triple fre uency operations.



Disadvantages:

Narrow andwidth.

Low efficiency.

Low Gain.

Extraneous radiation fro feeds and junctions.

Poor end fire radiator except tapered slot antennas.

Low power handling capacity.

Surface wave excitation



Comparisons between different feed techniques



Polarization Types

y Linear Polarization

y Circular Polarization

Right hand circular polarization

Left hand circular polarization



Design Procedure of si ple Rectangular

icrostrip Antenna

y Su strate Selection

y Copper Tape or Sheet

y Ele ent Width and Length

y Radiation Pattern

y eed Point Location



Designing Equations

121 1

1 122 2

r r reff

h

w

I I I

« »

! ¬ ¼- ½

R in= R r cos2 (Txf /L) , R r>=R in



Broad anding Techni ues

So e of the road and sche es under seriousconsideration

are

yPlanar ulti-resonators

y Stacked Electro agnetically

y Co pact road and icrostrip antennas



Rectangular Broad and Antenna Using Parasitic

Rectangular Patchy In this ethod, instead of using parasitic rings,

parasitic patches of si ilar di ensions are placed

around the ase fed-patch.

y Initially when designing the antenna, all four parasitic

ele ents had identical di ension as the ase patch.

y The lengths of the parasitic ele ents were altered

until the re uired resonant fre uencies were achiev

ed.



Cockroach antenna



Thank you

broadband patch antenna design new

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