annular ring antenna

Hi !

I'd like to design an annular ring slot antenna for 2.4 GHz. Could someone kindly point me out in the right direction as to how to design one (inner and outer radius specification etc) for a given substrate of dielectric constant er and thickness.

I have tried to search in books(Microstrip Antenna Design by Bhartia, Antennas by Balanis) and IEEE research papers but there seems to be no references to the basic design equations for annular-ring slot antennas

Many thanks

hi
you can use the following perfect refrence papers.
1. "I/P impedance of annular ring microstrip antenna using circuit theory approach" IEEE Trans on antenna and propagation Vol. AP-33, No.4, PP.369-374, April 1985.
2. "A broad -Band annular ring Microstrip Antenna" LEEE Trans. on Antennas and Propagation Vol. AP-30, No.5, PP 918-922 sep. 1982.
3. Vector Hankel Transform of Annular ring MA" IEEE Trans. on Antennas and Propagation Vol. AP-30 No4, pp. 637-644 1982.
4. wider Band Microstrip Antenna for CP" IEEE Antenna and propagation Vol AP 36 No 2, pp 157-163 feb 1988
5. generalized Transmission line model of Microstrip patches" proc. inst. elec, eng. Vol 132, pt.H, pp 193-198 Apr 1985.


note: i will attache the above refrence ASAP.

Regards
Hasan