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)
The return loss bandwidth of the unbalanced fed ultra low profile inverted L antenna has been extended by adjusting length and width of its conducting plane. The return loss less than -10 dB is satisfied at the frequency from 463 MHz to 606 MHz. This frequency bandwidth is almost 60 % of the television frequency band in Japan. This antenna is promising as… (More)
The WPT system composed of the unbalanced fed, ultra low profile inverted L antenna on a rectangular conducting plane is proposed and analyzed numerically. The input impedances of transmitting and receiving antennas are matched to 50 ohms by adjusting the length of horizontal element and the feed point position. The size of conducting plane is 550 mm by… (More)
The ultra low profile, conventional base fed F antenna is analyzed numerically and its characteristics are compared with those of the unbalanced fed, ultra low profile inverted L antenna. The design frequency is 2.45 GHz. When the size of conducting plane is 0.17 λ by 0.49 λ and the antenna height is 0.08 λ, the return loss bandwidth… (More)