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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