Advance Antenna System (ECE-6208)

7/25/2019 Advance Antenna System (ECE-6208)

1/23

dvance ntenna System

(ECE-6208)

Seminar on Rectangular Micro stri

Antenna#

$y%&eea' Rasaily(ME-Modular Su)*ect +eac"er% ,ar

Roll .o%//606 Assistent !ro1essor(.

ECE &ett%ECE

WMC-PRESENTATION BY DEEPAK RASAILY ROLL NO-141606

1


2/23

Content

Brie !i"tor#

W$%t %re Mi&ro"tri' Antenn%(

C)%""i*&%tion

+ee,in Te&$ni.e

Re&t%n)%r Mi&ro"tri' Antenn%

Mo,e)"

A,%nt%e 2Di"%,%nt%e" P3)i"$e, '%'er"

Con&)"ion

Reeren&e"


3/23

Brie !i"tor#

Microstrip antenna technology began in the late 1970s.

Invented by Bob Munson in 1972 (but earlier work by echa

to19"#$.

By the early 19%0s basic !icrostrip antenna ele!ents and arrays

established in ter!s o& design and !odeling.

'ttentions to i!proving antenna per&or!ance &eatures (e.. Bandw

increased application o& the technology.

*he &irst aperture coupled !icrostrip antenna was &abricated a

graduate student) allen buck) on august 1) 19%+) in the university oantenna lab.

*oday ,atch antennas play a very signi&icant role in the w

co!!unication syste!s.


4/23

W$%t %re Mi&ro"tri' Antenn%(

The Microstrip Patch Antenna is a single-layer design which consists generally

ground plane, substrate, and the feeding part)

A Micro-strip patch antenna consists of a radiating patch on one side of a dielec

has a ground plane on the other side.

Fig-1 shows tructure of MPA!"t has Patch (#ectangular) of $ength ($) % &i

% height (h) of ubstrate and the round plane.

Fig- hows co**ercially a+ailable MPA.


5/23

Basic Principles of Operation

-Microstrip patch antenna consists of a radiating patch on one

side of a dielectric substrate with a continuous *etal layer

bonded to the opposite side of the substrate which for*s aground plane. T

-The patch is generally *ade of conducting *aterial such as

copper or gold and can ta'e any possible shape. A patch antenna

is a narrowband, wide-bea* antenna fabricated by photo

etching

-The patch acts approi*ately as a resonant ca+ity (short circuit

walls on top and botto*, open-circuit walls on the sides).

-"n a ca+ity, only certain *odes are allowed to eist, at different

resonant freuencies.

-"f the antenna is ecited at a resonant freuency, a strong field

is set up inside the ca+ity, and a strong current on the (botto*)

surface of the patch. This produces significant radiation (a good

antenna).


6/23

Different Shapes of Micro-strip Patch El


7/23

Different Parameters of Micro-strip

Antenna

$ $ength of the Micro-strip Patch /le*ent

& &idth of the Micro-strip Patch /le*ent

t Thic'ness of Patch

h 0eight of the ielectricubstrate.


8/23

Design of the rectangular patch antenna

Calculate reff E5e&tie ,ie)e&tri& &on"t%nt

W$ere r -- T$e ,ie)e&tri& &on"t%nt o t$e "3"tr%te

C%)&)%te

C%)&)%te $ere


9/23

Re"on%n&e re.en or "'e&i*& 8o,e i"

Where m, n %re t$e o'er%tin 8o,e" o t$e Mi&ro"tri' '%t&$ %nteit$ L )ent$ W- i,t$

+or t$e e5e&tie r%,i%tion t$e ,e"in o t$e "tr&tre i" t$e t8o%"'e&t %n, or t$i" t$e i,t$ i" &%)&)%te, %"

W$ere

Design of the rectangular patch antenna


10/23

Re&t%n)%r P%t&$ Antenn% P%r%8

irecti+ity!irecti+ity is a funda*ental antenna para*eter. "t is a *easure of how 2d

radiation pattern is. An antenna that radiates eually in all directions would

directionality, and the directi+ity of this type of antenna would be 1 (or 4 d5).

In't i8'e,%n&e

Re:e&tion Coe;&ient T$e ,eree o i8'e,%n&e 8i"8%t&$ i"t$e re:e&tion &oe;&ient %t t$%t )o%, %n, i" ien 3#

W$ere


11/23

Re&t%n)%r P%t&$ Antenn% P%r%8

Return Loss :It &%n 3e "%i, t$%t $en t$e )o%, i" 8i"8%t&$e,'oer i" not ,e)iere, to t$e )o%, t$ere i" % retrn o t$e 'oe&%))e, )o""9 %n, t$i" )o"" t$%t i" retrne, i" &%))e, t$e =Retrn )

Gain: G ? @ D @ T$e ei&ien o t$e %ntenn% 9 D Dire&

Voltage Standing Wave Ratio

A" t$e re:e&tion &oe;&ient r%ne" ro8 0 to 19 t$e VSWR r%n

#adiation Pattern! A radiation pattern defines the +ariation of the power radiat

as a function of the direction away fro* the antenna. This power +ariation as

arri+al angle is obser+ed in the far field.


12/23

+ee, Te&$ni.e"

Microstrip patch antennas can be fed by a +ariety of *ethods.

These *ethods can be classified into two categories- contacting and

"n the contacting *ethod, the #F power is fed directly to the rad

connecting ele*ent such as a *icrostrip line.

"n the non-contacting sche*e, electro*agnetic field coupling is do

between the *icrostrip line and the radiating patch.

The four *ost popular feed techniues used are the *icrostrip line and coaial probe (both contacting sche*es)

aperture coupling and proi*ity coupling (both non-contacting sche


13/23

+ee,in Te&$ni.e Co8'%ri"on"

+ee, Te&$ni.e

Feed type Advantages Di

Proximity Copled 6o direct contact between feed and patch 7an ha+e large effecti+e thic'ness for patch substrate and

*uch thinner feed substrate

8 Multilayer fabri

Microstrip !ine

Monolithic,/asy to fabricate,/asy to *atch by controlling

"nsert position,/asy to *atch,$ow spurious radiation

8 purious radiation

for thic' substrate wh

Coaxial Feed

/asy to *atch

$ow spurious radiation

$arge inductance f

oldering reuired

Apertre Copled

9se of two substrates a+oids deleterious effect of ahighdielectric constant substrate on the bandwidth andefficiency

6o direct contract between feed and patch a+oiding largeprobe reactance or width *icrostrip line

6o radiation fro* the feed and acti+e de+ices since a groundplane separates the* fro* the radiating patch

Multilayer fabricat

0igher bac' lobe r


14/23

Met$o," o An%)#"i"

The preferred *odels for the analysis of Microstrip patch an

trans*ission line *odel, ca+ity *odel, and full wa+e *odel pri*arily integral euations:Mo*ent Method).

The trans*ission line *odel is the si*plest of all and it gi+e

insight but it is less accurate."n this *ethod we assu*e that

trans*ission line or a part of a trans*ission line.

The ca+ity *odel is *ore accurate and gi+es good physical insigh

in nature. in this *ethod we assu*e that the patch is a dielectric ;

The full wa+e *odels are etre*ely accurate, +ersatile and

ele*ents, finite and infinite arrays, stac'ed ele*ents, arbitrary s

and coupling. These gi+e less insight as co*pared to the two *o

abo+e and are far *ore co*ple in nature.


15/23

ADANTAES

Microstrip patch antennas are increasing in popularity for use in wireless

to their low-profile structure. Therefore they are etre*ely co*patible fo

antennas in handheld wireless de+ices such as cellular phones, pagers etc

The tele*etry and co**unication antennas on *issiles need to be thin an

are often in the for* of Microstrip patch antennas.

Another area where they ha+e been used successfully is in atellite co**

o*e of their principal ad+antages are gi+en below!

< $ight weight and low +olu*e.

< $ow profile planar configuration which can be easily *ade confor*al to

host surface.

< $ow fabrication cost, hence can be *anufactured in large uantities.

< upports both, linear as well as circular polari3ation.

< 7an be easily integrated with *icrowa+e integrated circuits (M"7s).

< 7apable of dual and triple freuency operations.

< Mechanically robust when *ounted on rigid surfaces.


16/23

DISADANTAES

Microstrip patch antennas suffer fro* *ore drawbac's a

to con+entional antennas. o*e of their *a=or disad+antagi+en below!

< 6arrow bandwidth.

< $ow efficiency.

< $ow ain.

< /traneous radiation fro* feeds and =unctions.

< Poor end fire radiator ecept tapered slot antennas.< $ow power handling capacity.

< urface wa+e ecitation.

Microstrip patch antennas ha+e a +ery high antenna uali


17/23

A'')i&%tion

Mo"ile and satellite commnication application# Mo"ileco**unication r

cost, low profile antennas. Microstrip patch antenna *eets all reuire*ents

$lo"al Positioning System applications#*icrostrip patch antennas with subper*itti+ity sintered *aterial are used for P.

%adio Fre&ency 'dentification (%F'D)##F" usesin different areas li'e *

co**unication, logistics, *anufacturing, transportation and health care

*orld+ide 'nteropera"ility for Micro+ave Access (*iMax)

%adar Application#. #adar de*ands a low profile, light weight antenna subs

antennas are an ideal choice.

%ectenna Application# #ectenna is a rectifying antenna, a special type of an

directly con+ert *icrowa+e energy into 7 power.

,elemedicine Application# "n tele*edicine application antenna is operating

Medicinal applications of patch# 'tis found that in the treat*ent of *aligna

*icrowa+e energy is said to be the *ost effecti+e way of inducing hyperther*


18/23

P3)i"$e, Re"e%r&$ P%'er

Tr'ti In%)e19 AATrio)i%rF9 nG%n R%t$oreH9 PCL%t%neSimulRectangular Microstrip Patch Antenna I J I R S !" Vol# $

Januar& '(%)

A3"tr%&t

I Si8)%tion o % re&t%n)%r 8i&ro"tri' '%t&$ %ntenn% o'er%tin o FH4 !J

II T$e 'eror8%n&e o %ntenn% i" "t,ie, in ter8" o '%r%8eter )i

Re:e&tion Coe;&ient9 SWR9 I8'e,%n&e 2 B%n,i,t$ o %ntenn

III Co8'%r%tie re")t or &ir&)%r %n, re&t%n)%r '%t&$ ,e"in i" e

)


19/23

P%r%8eter" %)e"

+or % re&t%n)%r '%t&$9 t$e )ent$ L o t$e '%t&$ i" "%))#L 0 o9 $ere o i" t$e ree-"'%&e %e)ent$

T$e '%t&$ i" "e)e&te, to 3e er# t$in "&$ t$%t t o $

'%t&$ t$i&ne""

T$e $ei$t h o t$e ,ie)e&tri& "3"tr%te i" "%))# 000Ho

T$e ,ie)e&tri& &on"t%nt o t$e "3"tr%te r i" t#'i&%))# in tQ r Q 1F

Re")t O3t%ine,

Otpt Parameters %ectangla

Physical Parameters @.?1B(&idth)

Effective Parameters @.1@?

(&idth)

E-P!AE .PB* C?.44444

.-P!AE .PB* C?.44444

Directivity of patch B.DB?

Directivity of patch .4DB db


20/23

Si8)%tion Re")t


21/23

Reeren&e"

Antenna Theory!Analysis and esign by 7A 5alanis,Third /dition

https!::en.wi'ipedia.org:wi'i:MicrostripEantenna.

"ndrasen ingh, r. .. Tripathi ,GMicro strip Patch Antenna and

Applications! a ur+eyG "H7TA I /PT-J7T 411

Trupti "ngale1, A.A.Tri'oli'ar, un=an #athoreD, P.7.$ataneKi*

#ectangular Microstrip Patch AntennaG " H " # / T, ol. ?, "ssue41@.
https://en.wikipedia.org/wiki/Microstrip_antennahttps://en.wikipedia.org/wiki/Microstrip_antennahttps://en.wikipedia.org/wiki/Microstrip_antennahttps://en.wikipedia.org/wiki/Microstrip_antennahttps://en.wikipedia.org/wiki/Microstrip_antenna


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Documents

Advance Antenna System (ECE-6208)