SUMMARY The wall admittance of an arbitrarily shaped microstrip antenna is generally formulated. As examples, elliptical microstrip antennas with and without a circular slot are calculated. The wall admittance is determined by the spectral domain analysis in order to consider the effect of the dielectric substrate. The electromagnetic fields within the… (More)
SUMMARY The formulation of the wall admittance of a circular microstrip antenna by the spectral domain method is presented. The circular microstrip antenna is calculated using the cavity model. The electromagnetic fields within the antenna cavity are determined from the impedance boundary condition at the side aperture. The contribution from the region… (More)
1. Introduction The authors have analyzed the resistance-loaded planar monopole antenna located within a rectangular parallelepiped cavity for impulse radar and shown the broadband operation of input impedance for the frequencies from 0.5 GHz to 4.5 GHz . This antenna is fed by a coaxial probe from the wall of the rectangular cavity of 48 mm by 44 mm… (More)
The compact TV antenna composed of the unbalanced fed ultra low profile inverted L antenna is proposed. The antenna size is 40 mm by 244 mm by 32 mm. The return loss less than -10 dB is satisfied at the frequencies from 470 MHz to 713 MHz. The directivity is 2.83 dBi to 3.25 dBi.
An ultra low profile unbalanced inverted antenna is proposed, which is analyzed numerically and its characteristics are compared with those ultra low profile inverted L antenna and conventional base fed inverted antenna then compared with its measured results. The design frequency is 2.45 GHz. When the size of conducting plane is 0.245 λ by 0.49… (More)
An ultra low profile inverted L antenna located within the rectangular conducting plane has been analyzed. In this paper, two types of inverted L antennas are proposed. The directivity of 3.3 dBi is obtained in the case of inverted L antenna composed of the coaxial cable, and 1.87 dBi in the case of inverted L antenna composed of CPW. This antenna is… (More)
SUMMARY The electric currents on the upper, lower and side surfaces of the patch conductor in a circular microstrip antenna are calculated by using the integral equation method and the characteristic between the electric currents on the upper and lower surfaces is compared. The integral equation is derived from the boundary condition that the tangential… (More)