Input impedance of a wraparound microstrip antenna on a conical surface

Microstrip antennas are used where low-profile, conformable antenna structures are advantageous. They are ideal for applications on the surface of missiles, rockets, and other aircraft, where aerodynamics and weight are issues of importance. This paper deals with the input impedance of the antenna shown. In the analysis of the antenna, surface wave excitation is assumed to be negligible, and fringing at the microstrip edges is neglected. The thickness of the dielectric substrate is very small compared to a wavelength in the dielectric (h/spl Lt//spl lambda//sub g/), so that the cavity field is dominated by the E/sub /spl theta// component.