Research Article
A Frequency Agile Semicircular Slot Antenna For Cognitive Radio System
Table 3
Comparison of various antennas with proposed antenna.
| | Antennas | Frequency range | Number of states | Number of diodes | Frequency ratio |
| | Ref. [7] | 6–10.6 | 5 | 5 | 1.76 | | Ref. [11] | 6–10.6 | 8 | 7 | 1.76 | | Proposed | 5.3–9.90 | 14 | 6 | 1.85 : 1 |
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