DESIGN PARAMETER SYMBOL DESIGN VALUE NOTE – COMMENT
Length extension
DL
0.79 mm (0.031 in) Equation 2
Conductor length L 15.38 mm (0.605) Equation 4
Resonant input resistance R
in
248 W
Equation 5
Inset feed length y
o
5.41 mm (0.213 in) Equation 6
Quarter-Wave transformer Z
o
112 W
Equation 7
Quarter-Wave transformer
L
l/4
8.48 mm (0.334 in) Microstrip calculator
16
Quarter-Wave transformer, width
W
l/4
1.05 mm (0.035 in)
Microstrip calculator
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Directivity D 7.0 dB Equation 12
Radiation pattern E-plane P
E
Figure 8 Equation 9
Radiation pattern H-plane P
H
Figure 8 Equation 10
Figure 8 represents the E-plane and H-plane
radiation patterns of the 5.80 GHz, rectangular
microstrip antenna. Note that the beamwidth of the
E-plane radiation pattern is somewhat greater than
the H-plane beamwidth. It should also be noted that
the H-plane radiation pattern is independent of the
slot separation length, L; this is not evident from
equation 10 until one cautiously considers the
equation under the condition,
f = p/2.
The E-plane and H-plane radiation patterns of Figure 8
were calculated with MathCad™ using the equations of
[4]. Similar patterns are produced using the other cited
references.
16
On-Line microstrip parameter calculator: http://www.microwaves101.com/content/calculators.cfm
Figure 8 – E-Plane (red) and H-Plane (black) Radiation Patterns
0
30
60
90
120
150
180
210
240
270
300
330
20 -
15 -
10 -
5 -
0
E-Plane and H-Plane Radiation Pattern
Microstrip Antenna Design
11 www.cadence.com/go/awr
