Deschamps first proposed the concept of the MSA in 1953practical antennas were developed by Munson and Howell in the1970s.Metallic patches mounted on a dielectric substrateThe radiating patch can be of any shape such as circular, rectangular, triangular, sectoral, annular ring, semicircular .Low profile, conformable to various surfaces, inexpensive, durable, but narrow-band
Dual Band Microstrip Antenna
“ DUAL BAND MICROSTRIP ANTENNA”
Mr. Kadri Anas (20100354)
UNDER GUIDANCE OF
Mr. S. V. Khobragade
DEPARTMENT OF ELECTRONICS & TELECOMMUNICATION ENGINEERING
DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY
• A metallic device for radiating or receiving radio waves.
• A transitional structure between free space & a guiding device.
Types Of Antennas
a) Wire Antennas
b) Aperture Antennas
c) Microstrip Antennas
d) Reflector Antennas
e) Lens Antennas
o In its most basic form, a Microstrip patch antenna consists of a radiating patch on
one side of a dielectric substrate which has a ground plane on the other side.
Basic Principles of Operation.
The patch acts approximately as a resonant cavity (short circuit walls on
top and bottom, open-circuit walls on the sides).
If the antenna is excited at a resonant frequency, a strong field is set up
inside the cavity, and a strong current on the surface of the patch. This
produces significant radiation.
The radiating patch can be of any shape such as circular,
rectangular, triangular, sectoral , annular ring, semicircular .
Low profile, conformable to various surfaces, inexpensive, durable,
For good antenna performance, a thick dielectric substrate having a
low dielectric constant is desirable since this provides better
efficiency, larger bandwidth and better radiation .
Micro strip patch antenna or patch antenna is a narrow band ,widebeam antenna.
A thicker substrate will increase the radiation power , reduce
conductor loss and improve Band width.
1.Microstrip Line Feed.
A conducting strip is connected to the edge of
the patch. The feed can be etched on the
• In this type of feeding the feeding is
done to small aonther patch instead of
main radiating patch.
3. Coaxial Feeding.
The Coaxial feed or probe feed is a very common technique used for
feeding Microstrip patch antennas.
The center conductor of the coaxial connecter is soldered to the patch.
1.Easy to fabricate and match.
2.Low spurious radiation.
Effects of Key Design Parameters
on Antenna Performance
Dimensions of Feed Strip
Size and properties of Dielectric substrate
Different Shapes of Radiator Patch
Low weight and small volume.
Low fabrication cost
Allows linear and circular polarization.
Capable of dual and triple frequency operations.
Low power handling capacity.
Spurious feed radiation.
Low power and low gain can overcome by arrays configuration.
Surface wave associated limitations such as poor efficiency,
increased mutual coupling , reduced gain and radiation pattern can
The band width can increase up to 60% by using Bandwidth
Dual Band Microstrip Antenna.
In order to design a circular microstrip antenna for multiband
applications suitable dielectric substrate of relative permittivity
Єr=4.2 and thickness h=1.6mm is chosen.
The circular microstrip antenna has radius=16.625mm.
T-shaped slot with appropriate dimension is provided on the circular
patch to get dual band frequencies.
• The proposed antenna is probe fed and
antenna parameters like Return Loss,
VSWR and Radiation pattern at
corresponding resonance frequencies are
simulated on HFSS.
• The simulation of the proposed antenna is done on HFSS software,
Simulation gives dual frequencies at 2.30 GHz and 5.8 GHz.
• VSWR stands for Voltage Standing Wave Ratio.
Used in Mobile Satellite Communication System.(2.3 GHz)
Wire less LAN’S.(2.3 GHz)
GPS system.(2.3 GHz)
Can also be used for Radio Applications.(5.8 GHz)
G. Kumar and K. P. Ray, Broadband Microstrip Antennas, Artech House,
Norwood, Mass, USA, 2003
 C. A. Balanis, Antenna Theory, John Wiley & Sons, Hoboken, NJ, USA,
2nd edition, 2004.
R. Garg, P. Bhartia, I. Bahl, and A. Ittipiboon,Microstrip Antenna Design
Handbook, Artech House, Norwood, Mass, USA, 2001.
A Novel Dual Band Circular Microstrip Antenna , International Journal of