1. Microstrip antennas;Howell;IEEE Trans. Antennas and Propag.,1975
2. Improved theory for microstrip antennas;Richards;Electron. Lett.,1979
3. Theory of the circular disk printed-circuits antennas;Long;Proc. Inst. Electr. Eng.,1978
4. R. P. Jedlicka, et al. Mutual coupling between rectangular and circular microstrip elements, IEEE/APS-80, pp. 750-753 (1980).
5. F. J. Parks, et al. Mutual coupling between microstrip disk antennas, IEEE/APS-76, pp. 399-402 (1976).