A Frequency Agile Semicircular Slot Antenna For Cognitive Radio System

Table 2

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

State	Switch state						⁢Simulated frequency (GHz)		Bandwidth (MHz)		Gain (dBi)
	D1	D2	D3	D4	D5	D6	Simulated	Measured	Simulated	Measured	Simulated	Measured
1	OFF	OFF	OFF	OFF	OFF	OFF	5.33	5.19	170	165	2.99	2.90
							8.94	8.80	220	217	6.32	5.30
2	OFF	OFF	OFF	ON	OFF	OFF	5.81	5.66	220	215	3.36	3.20
3	OFF	OFF	ON	OFF	OFF	OFF	6.10	5.94	200	190	2.75	2.64
							8.20	8.02	200	195	3.04	2.95
4	OFF	OFF	OFF	OFF	ON	OFF	6.45	6.33	140	132	2.47	2.42
							8.6	8.49	270	264	3.34	3.26
5	OFF	OFF	ON	ON	OFF	OFF	6.61	6.56	310	305	2.54	2.42
6	OFF	ON	OFF	ON	OFF	OFF	7.42	7.23	310	300	3.65	3.50
							9.81	9.60	190	185	4.08	4.02
7	OFF	OFF	ON	OFF	ON	OFF	7.58	7.54	410	400	3.88	3.73
8	OFF	ON	OFF	OFF	ON	OFF	8.40	8.31	410	400	4.95	4.87
9	ON	OFF	OFF	OFF	ON	OFF	8.90	8.68	260	255	4.40	4.30
10	OFF	ON	OFF	OFF	OFF	OFF	8.97	8.93	280	270	5.29	5.18
11	ON	OFF	OFF	OFF	OFF	OFF	9.32	9.17	220	208	4.29	4.15
12	OFF	OFF	OFF	OFF	OFF	ON	9.32	9.17	220	208	4.29	4.15
13	OFF	ON	OFF	OFF	OFF	ON	9.43	9.37	270	260	3.72	3.40
14	ON	OFF	OFF	OFF	OFF	ON	9.9	9.83	330	325	3.99	3.78