Abstract :
John Mahony has pointed out several corrections to various equations, tables and and tex in the August Antenna Designer??s Notebook (J.D. Mahany, "Approximate Expressions for the Directivity of a Circular Microstrip-Patch Antenna," IEEE Antennas and Propagation Magazine, vol 43, no 4, August 2001, pp. 88-90), the following corrections should be made:
