3. 3
*
* Microstrip antennas are planar resonant cavities that radiates from their edges.
*Microstrip antenna are popular for low profile applications.
*Linear and circular polarization can be achieved effortlessly.
*Microstrip antennas are usually used for Ultra High Frequencies (UHF) & High
Frequencies (HF) because of the antenna size is tightened to the wavelength at the
resonant frequency.
*It provides better efficiency, larger bandwidth & better radiation.
4. 4
*
*Also known as āPRINTED ANTENNASā, which consisting of a radiating patch on one
side of the dielectric substrate having a ground plane on the other side .
*Useful for high performance in extreme applications: aircraft, satellite, missiles,
cellphones and electronic devices.
*PROS:
*Cost effective, easy to fabricate, mechanically robust and very versatile.
*Capable of dual & triple frequency operations.
*CONS:
*Irrelevant radiation from feeds and from junctions.
*Poor scanning properties and very narrow frequency bandwidth.
6. 6
*
*In this paper, two structural designs have been propose, the basic schematic structure
of the microstrip patch antenna is:
Basic structure of the antenna Dimensions for the basic
design
Parameters Dimensions
(mm)
c 2.5
d 4
f 1.5
g 7.5
h 7
i 3
Fx 13.5
Fy 13.5
7. 7
*
*In the modified design, to achieved broadband operation miniaturization is obtained by
etching two rectangular slots, while converting a rectangular patch into a āA-shapedā
Proposed structure of the A-shaped antenna Dimensions of the modified design
Parameter
s
Dimension
s
(mm)
c 2.5
d 4
e 1.5
f 1.5
g 7.5
h 7
i 3
j 4
Fx 13.5
Fy 13.5
8. 8
*
Parameters Dimensions
(mm)
i 4
k 11.7
m 3.8
p 14.8
q 13.5
r 7.5
o 1
n 1.2
Schematic diagram of the ground
plane of the proposed antenna
embedded with rectangular slots.
Dimensions of the mentioned
design
9. 9
*
*From the modified antenna obtained an impedance bandwidth of 3.663 GHz with
RL of 17.21dB. S-parameter of the antenna states that it covers the WLAN &
WiMAX application band within the impedance bandwidth.
Magnitude of S-parameter vs frequency Magnitude of gain vs frequency
10. 10
*
*Accumulated frequencies can be used for S-band communications.
*Particle accelerators may be powered by S-band RF sources. The frequencies are
then standardized at 2.998 GHz (Europe) or 2.856 GHz (US).
* IEEE 802.16a and 802.16e standards utilize a part of the frequency range of S
band.
* S-bandsā properties are so unique that this band is mainly used for radar systems.
*Technology may be used for real time data & status for traffic and weather
conditions.
15. 15
*In this paper a combination of A-shaped slot which is etched over the top
surface and rectangular slots are used for this purpose.
*The 10 dB impedance bandwidth of the proposed antenna is 3.663 GHz
(3.152GHz-6.815GHz).
* Compactness of the antenna is achieved by embedding two slots at the ground
plane.
*From the desired frequencies obtained this A-shaped antenna can be used for
the applications of WLAN and Wi-MAX bands.
*
16. 16
*
*Jaewon Lee, Seokjinhong, Jaewoong Shin, and Jaehoonchoi, āA compact
ultrawideband monopole antenna for wireless communication applicationā, IEEE
transactions on antennas and propagation, vol.57,no. 9,pp. 2785-2788, September
2009.
*Wen-Shanchen and Kuang-Yuanku, āBand-rejection design of the printed open slot
antenna for wlan/wimax operationā, IEEE transactions on antenna and propagation,
vol. 56, no 4,pp.1163-1169, April 2008.
*T. Aboufoul, R.Bharadwaj and A.Alomainy, āReconfiguration of ultra wideband
antenna for milti-band operation in cognitive radio applicationā, Conference on
antenna and propagation EUCAP,978-88-90701 2014.
*Kin-Luwong and Wen-Hsiuhsu, āA broad-band rectangular patch antenna with a pair
of wide slitsā IEEE transactions on antennas and propagation, vol 49, no. 9, pp.
1345-1347, september 2001.
*Kalyan Mondal and Partha pratim Sarkar, āM-shaped broadband microstrip patch
antenna with modified ground planeā, Microwave and optical technology letters.
vol.57, no. 6, pp. 1308-1312, june 2015
*H-W. Liu and C.-F.Yang, āMiniature broadband antenna for Wlan/Wimax and lower-
band UWB applicationsā,Electronics letters19thNovember 2009 vol.45 no.24.
Substrate Integrated Waveguide (SIW) belongs to the clan of substrate integrated circuits and is fabricated by using two periodic rows of conducting cylinders (via