DESIGN OF CORPORATE FEED RECTANGULAR MICROSTRIP PATCH ANTENNA AUTHORS P SUBBULAKSHMI R RAJKUMAR

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DESIGN OF CORPORATE
FEED RECTANGULAR MICROSTRIP PATCH ANTENNA

AUTHORS
P.SUBBULAKSHMI
R.RAJKUMAR


OBJECTIVES
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 To design microstrip patch antenna array configuration with high
gain, large bandwidth and smaller size for Wi-MAX applications.


INTRODUCTION
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 Antenna is a electrical device which converts electrical power into radio
waves .
 This paper proposes the design of 4-element microstrip patch antenna.
 It uses corporate feed technique for excitation.
 Taconic is the dielectric substrate (εr=2.2)
 The design is simulated using FEKO software.
 Frequency range – 1 to 6 GHz.
 Attractive for airborne and spacecraft applications.
 Size reduction using high dielectric materials.
 Narrow bandwidth should be enhanced.
 Different feeding techniques

MICROSTRIP PATCH ANTENNA
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 Consists of thin metallic strip called patch.
 Thickness of patch ( t << λ0 )
 Low profile
 Simple and inexpensive
 Patch radiates first because of fringing fields.
 Mechanically robust to mount


MICROSTRIP PATCH ANTENNA

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FEEDING TECHNIQUES
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FEEDING METHODS

NON CONTACTING

CONTACTING

PIN FEED

EDGE FEED

APERTURE

PROXIMITY

COUPLING

COUPLING


FEEDING TECHNIQUES
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Conti…
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Parameters to be discussed
 Gain
 Return Loss
 Impedance
 Radiation Pattern

Softwares Required
 FEKO
 SONNET


Existing Technique
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


MICROSTRIP CORPORATE FEED
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 Provide power split of 2n (n=2,4,8,16…).
 It also uses quarter wavelength transformer method.
 Phase can be controlled using phase shifter.
 Amplitude can be adjusted using either attenuator or amplifier.


Microstrip Patch Design
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

Design Parameters:


Frequency (f)



Lambda (c/f)



Patch depth (d)



Patch width (w)



Substrate (ɛr



Substrate Height (h)


Conti…
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 Easy to fabricate.
 Simple to match the impedance by controlling the inset position.
 Conducting strip is directly connected to the edge of the patch.
 If thickness increases, surface waves and spurious feed radiation
increases.


Co-axial / probe
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 Inner conductor  extends through dielectric.
 Outer conductor connected to ground plane.
 Feed can be placed anywhere in the patch.

 Low spurious radiation.
 Broad bandwidth applications, even for a thick dielectric substrate.
 Used in Wi -MAX applications.


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MICROSTRIP CORPORATE FEED
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 Provide power split of 2n(n=2,4,8,16….).
 It also uses quarter wavelength transformer method.
 Phase can be controlled using phase shifter.
 Amplitude can be adjusted using either attenuator or amplifier.


DESIGN CONSIDERATION
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 Frequency of operation(f0): 9-11 GHz
 Dielectric constant ( εr): 2.2
 Dielectric substrate: TACONIC
 Height of dielectric substrate(h): 2.87mm


 By using FEKO SUITE, we have designed the Microstrip Patch
Antenna.

SOFTWARE USED

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MICROSTRIP PATCH PARAMETERS
Microstrip patch parameters from
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FEKO software

RETURN LOSS

PATCH PARAMETERS

OBTAINED VALUES

F

Frequency(Hz)

8.475 Hz

GAIN

Gain(dB)

6.8 dB

Return loss(dB)

-6.8 dB

RESULT OF SIMULATION


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 Used in air borne and spacecraft applications.
 Highly suitable for x-band applications.
 In satellite and military systems.

APPLICATIONS


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 Simple, Small size and high efficiency antenna can be designed.
 Return loss, gain and efficiency are acceptable
 Bandwidth enhancement of 20dB is possible
 Our future work will be carried out using different feeding techniques
with different software………

CONCLUSION


THANK

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YOU

QUERIES ????

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