A Frequency Agile Semicircular Slot Antenna For Cognitive Radio System

Table 1

Simulated resonant frequencies, bandwidth, and gain at various states of the PIN diodes.

State	Switch state						Simulated frequency (GHz)	Simulated bandwidth (MHz, %)	Simulated gain (dBi)
	D1	D2	D3	D4	D5	D6
1	OFF	OFF	OFF	OFF	OFF	OFF	5.33	170, 3.18	2.99
							8.94	220, 2.46	6.32
2	OFF	OFF	OFF	ON	OFF	OFF	5.81	220, 3.78	3.36
3	OFF	OFF	ON	OFF	OFF	OFF	6.10	200, 3.27	2.75
							8.20	200, 2.43	3.04
4	OFF	OFF	OFF	OFF	ON	OFF	6.45	140, 2.17	2.47
							8.6	270, 3.13	3.34
5	OFF	OFF	ON	ON	OFF	OFF	6.61	310, 4.68	2.54
6	OFF	ON	OFF	ON	OFF	OFF	7.42	310, 4.17	3.65
							9.81	190, 1.93	4.08
7	OFF	OFF	ON	OFF	ON	OFF	7.58	410, 5.40	3.88
8	OFF	ON	OFF	OFF	ON	OFF	8.40	410, 4.88	4.95
9	ON	OFF	OFF	OFF	ON	OFF	8.90	260, 2.92	4.40
10	OFF	ON	OFF	OFF	OFF	OFF	8.97	280, 3.12	5.29
11	ON	OFF	OFF	OFF	OFF	OFF	9.32	220, 2.36	4.29
12	OFF	OFF	OFF	OFF	OFF	ON	9.32	220, 2.36	4.29
13	OFF	ON	OFF	OFF	OFF	ON	9.43	270, 2.86	3.72
14	ON	OFF	OFF	OFF	OFF	ON	9.90	330, 3.33	3.99