The input admittance quality factor and relative bandwidth of the rectangular cavitybacked slot antenna
Abstract
Equations which represent the magnetic and electric stored energies are derived for an infinite section of rectangular waveguide and a rectangular cavity. These representations which are referred to as being physically observable were obtained by considering the difference in the volume integrals appearing in the complex Poynting theorem. It is shown that these physically observable stored energies were determined by the field components that vanish in a reference plane outside the aperture. These representations were used to compute the input admittance of a rectangular cavitybacked slot antenna in which a single propagating wave is assumed to exist in the cavity. For the rectangular cavitybacked slot antenna, the Q and relative bandwidth were computed independently by using energy relationships. It is shown that the asymptotic relationship which is usually assumed to exist between the Q and the reciprocal of relative bandwidth is equally valid for the rectangular cavitybacked slot antenna.
 Publication:

Ph.D. Thesis
 Pub Date:
 1974
 Bibcode:
 1974PhDT........64C
 Keywords:

 Bandwidth;
 Energy Distribution;
 Q Factors;
 Rectangular Waveguides;
 Slot Antennas;
 Asymptotic Series;
 Energy Storage;
 Numerical Analysis;
 Poynting Theorem;
 Communications and Radar