Post on 03-Apr-2018
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MICROSTRIP ANTENNA
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Microstrip patch antennaadvantages
Low profile, light weight, low volume, low fabrication cost
Support both linear and circular polarization
Compatible with microwaves ICs
Capable of dual and triple frequency operation
Mechanically robust when mounted on rigid surfaces
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Microstrip patch antenna
disadvantages Narrow bandwidth, low efficiency, low gain
Low power handling capacity
Surface wave excitation
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Construction
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Various type of microstrip antennas
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Feeding Methods
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Patch Calculation
Step 1: Calculation of the Width (W
):
Substituting c = 3.108 m/s, r= 3.8, we get:
Results:W= 42.23 mm forfo= 2.4 GHz
W= 19.49 mm forfo= 5.2 GHz
2
)1(2 0
rf
cW
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Patch Calculation
Step 2: Calculation of Effective dielectric constant (reff):
h = 1.524 mm
Results:
reff = 3.18 forfo= 2.4 GHz
reff = 3.05 forfo= 5.2 GHz
2
1
1212
1
1
1
W
hrrreff
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Path Calculation
Step 3: Calculation of the Effective length (L eff):
Results:L eff= 35.03 mm for fo= 2.4 GHzL eff= 16.53 mm for fo= 5.2 GHz
reffeff f
cL
02
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Path Calculation
Step 4: Calculation of the length extension (L):
Results:
L = 0.73 forfo= 2.4 GHz
L = 0.72 forfo= 5.2 GHz
8.0258.0
264.03.0
412.0
h
W
h
W
hLreff
reff
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Path Calculation
Step 5: Calculation of actual length of patch (L):
Results:L = 33.59 mm forfo= 2.4 GHzL = 15.08 mm forfo= 5.2 GHz
LLL eff 2
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Patch Calculation
Step 6: Calculation of the ground plane dimensions (Lg
and Wg
):
Results:
Lg = 42.70 mm and Wg = 51.38 mm forfo= 2.4 GHzLg = 24.23 mm and Wg = 28.64 mm forfo= 5.2 GHz
LhLg
6 WhWg
6