Title :
Polarization characteristics of resistively loaded orthogonal dipoles excited by ultra wideband signals
Author_Institution :
Dept. of Electr. Eng., Howard Univ., Washington, DC, USA
Abstract :
Polarization characteristics of the radiated electric field in free space at far distances from resistively loaded thin half-wave orthogonal dipoles excited by short pulses are investigated. It is shown that the radiated field can become circularly polarized in the broadside direction when the exciting input voltage is sinusoidal and the input to the x-axis dipole is the same as the input to the z-axis dipole but delayed by a quarter cycle. The Wu-King loading profile (see Wu, T.T. and King, R.W.P., IEEE Trans. Antennas and Propagation, vol.13, p.369-73, 1965) is considered here. These results are compared with that of the radiated field of unloaded orthogonal dipoles excited by finite cycles of sinusoids.
Keywords :
antenna theory; dipole antennas; electromagnetic field theory; electromagnetic wave polarisation; radar antennas; transmitting antennas; UWB radar; Wu-King loading profile; broadband antennas; broadside direction; circular polarization; orthogonal dipoles; polarization characteristics; radiated electric field; resistively loaded dipoles; short pulses; thin half-wave dipoles; traveling wave antenna; ultra wideband radars; Antenna theory; Broadband antennas; Dipole antennas; H infinity control; Impedance; Loaded antennas; Polarization; Radar scattering; Transmitting antennas; Ultra wideband technology;
Conference_Titel :
Ultra Wideband Systems and Technologies, 2002. Digest of Papers. 2002 IEEE Conference on
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
0-7803-7496-7
DOI :
10.1109/UWBST.2002.1006385
