From: Efficient design of a wideband tunable microstrip filtenna for spectrum sensing in cognitive radio systems
Parameter
Value \((\text{mm})\)
\({d}_{1}\)
8
\({a}_{1}\)
4
\({d}_{2}\)
5.5
\({a}_{2}\)
2
\({d}_{3}\)
1. 5
\({a}_{3}\)
3
\({d}_{4}\)
0.75
\({R}_{h}\)
1
\({d}_{5}\)