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7/25/2019 1.Antenna Miniaturisation
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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