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Different Techniques of Antenna

Miniaturizations

Compact Meander-Type Slot Antennas

Presented by:

Lopamudra Mazumder

Research Scholar (PhD)

E&ECE Department

II !hara"pur

Ind#a$

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Requirement of Compact Antenna [1]

Compact antennas are needed so that more antennas can be closely packed toether !ithout

the risk of mutual and parasitic couplin bet!een them"

#or local area net!orks$ there is an emerin interest in makin antennas small enouh to

ultimately fit on a sinle chip !ith the rest of the recei%in front-end"

At lo! frequencies &'#()'#*$ miniature antennas are in hih demand$ since the antenna si+e

often imposes a sinificant limitation on the o%erall si+e of a portable !ireless system"

[1] R" A+adean and ," Sarabandi$ A no%el approach for miniaturi+ation of slot antennas$.IEEE rans$ %ntennas Propa""$ %ol" /1$ no" 0$ pp" 21-23$ Mar" 2440"

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5ntroduction

#e! !ell-kno!n techniques to reduce the si+e of the microstrip antenna6

1" 7se hih dielectric substrate"

2" Application of resisti%e8reacti%e loadin bet!een patch and round"

0" 5ncreasin the electrical lenth by optimi+in the shape of a microstrip

antenna so that its o%erall si+e is reduced for a i%en operatin frequency"

9ased on the fact that the hori+ontal slot line mainly contributes to the

radiation of microstrip slot antenna$ in this paper !e discuss about a modified

meander-type slot antenna"

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Miniaturi+ation of Antenna6 )ariation of slot :eometry

9y %aryin the slot eometry of the antenna$ the chanes of the resonant frequency of this

antenna can miniaturise slot antenna is /;< smaller than con%entional Slot Antenna"

The !idth of lonitudinal-directed slot is narro!er than that of the hori+ontal slots" This

method can do!nsi+e con%entional meander-type antenna !ithout deterioratin the

radiation pattern"

The lenth and the !idth of the feed line can be ad=usted to achie%e a ood input match"

#i1"

Con%entional

Slot antenna

#i2"

Miniaturised

Slot Antenna

slot !idths6

>1?>2 ? 1"4 mm"

The meander slot antenna is fabricated on

2 Teflon substrates"

The miniaturi+ed antenna dimensions are6>1?4"1 to 1 mm$ >2? 1 mm$ ) ? '?11

mm

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Contd@

The presented meander slot antenna !hich has non-

uniform slot line !idths >ith same dimension the

resonant frequency of the antenna has been decreased

from 0"43 :'+ to 2"03 :'+"

The measured 14d9 band!idth of the meander slot

antenna is "/ M'+ & about 1"/B

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Conclusion

>e proposed a meander slot antenna !hich has non uniform slot line !idths">ith same dimension the resonant frequency of the antenna has been decreased from

0"43 :'+ to 2"03 :'+"

Con%entional meander slot antenna suests that the resonant frequency of the

meander antennas decreases by increasin meander sections" 'o!e%er" !e can

decrease the resonant frequency by reducin the slot !idth !ithout chanin the totallenth of the meander sections$ thus maintain the o%erall antenna si+e"

>ith this approach$ the si+e of the modified antenna is about /;< smaller than that

of con%entional one"

The disad%antae of these antennas !ould be its lo! radiation efficiency due tosmall area"

Stackin hih dielectric substrate on the antenna and8or usae of a hih temperature

superconductor surface could be adapted to compensate the lo! radiation efficiency"

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References

[ 5 ] ," C" :upta$ Ramesh :an$ 5nder 9ahi$ and rakash hartia$ Microstriplines and slotlines$ Artech 'ouse 9oston" Dondon$ pp"2;3-00$ 133;

[2] '" F" >an and M" G" Dancaster$ Aperture coupled thin film

superconductin meander antennas.$ 5EEE Trans Antennas ropaat %ol" $

pp"B23-B0;$ 1333

[0] '" F" >an$ 5" Simkin$ C" Emson$ and M" G" Dancester$ Compact meander

slot antennas.$ Micro!a%e and Hptrcal Tech Detters %ol" 2 $ pp"0-0B4$ 2444[] Gui-'an Du and ,in Du >on$ Slot-loaded meandered rectanular

microstrip antenna !ith compact dual frequency operation.$ Electronics

Detters %ol" 0$ pp"14B-14/4$ 133B"

[/] R" A+adean and ," Sarabandi$ A no%el approach for miniaturi+ation of

slot antennas$. IEEE rans$ %ntennas Propa""$ %ol" /1$ no" 0$ pp" 21-23$

Mar" 2440"

[;] lun-Min ,im$ Gon-:!an Fook$ >oo-Foun Son$ Foun-Goon Foon$

Gae-Feon ark$ 'an-,yu ark$ Compact Meander-%pe Slot Antennas.$ 4-

B40-44-B8418I144"24444 1IEEE$

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THANK YOU