I am designing antenna but the required bandwidth is very less. I want to increase the bandwidth. Is there any tradeoff between antenna radius and bandwidth?
Increase the thickness (radius) of the radiator. A good exercise is to run a wire antenna simulator (like NEC) and see what happens to feedpoint impedance vs. frequency as the monopole radius is varied. Better yet, write your own Hallen or Pocklington equation solver (easy to do with Octave or Matlab) to learn how these simulators work and what the tradeoffs are.
Good luck!
@George Slade : Thank you for your support. Actually I am designing Monopole antenna for the detection of the different solar Activities but Giving some problem related with Bandwidth.
i want to detect frquency of 20mhz . I am using CADFEKO software.
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