Design of Tunable Monopole Arm Planar Spiral Antenna for Cognitive Radio

Table 2

Resonated frequencies at different diode junction capacitance.

Bias voltage (v)	Junction capacitance (pF)	Resonant frequencies (GHz)
4	0.9	1.1, 2, 2.8, 3.51, 4.88, 5.55, 6.3, 7, 7.71, 8.46
0.5	2	1.07, 1.97, 2.76, 3.26, 3.51, 4.88, 5.66, 6.32, 7.72, 8.49