Title :
A Magneto-Electric Dipole for Unidirectional UWB Communications
Author :
Lei Ge ; Kwai Man Luk
Author_Institution :
State Key Lab. of Millimeter Waves, City Univ. of Hong Kong, Hong Kong, China
Abstract :
A new magneto-electric dipole antenna is designed. The antenna is composed of a horizontal bowtie electric dipole, a center-fed loop antenna functioning as a magnetic dipole and a rectangular cavity. A microstrip-to-stripline transition is employed as a balun to feed the antenna. A prototype was fabricated and measured. Results show that an impedance bandwidth of 110%, with SWR ≤ 2 from 3.08 to 10.6 GHz, was achieved. A stable gain of 8.7 ±1.9 dBi was realized by using the rectangular cavity. Stable radiation pattern with low cross polarization ( ≤ -20 dB), low back radiation ( ≤ -13 dB) and symmetrical E- and H-plane patterns was found over the operating frequencies. Moreover, the impulse response is analyzed which reveals the antenna with good time domain characteristic.
Keywords :
antenna radiation patterns; bow-tie antennas; dipole antennas; loop antennas; microstrip transitions; polarisation; time-domain analysis; ultra wideband communication; H-plane patterns; balun; bandwidth 3.08 GHz to 10.6 GHz; center-fed loop antenna; cross polarization; impedance bandwidth; impulse response; low back radiation; magnetic dipole; microstrip-to-stripline transition; operating frequencies; rectangular cavity; stable radiation pattern; symmetrical E-plane patterns; time domain characteristic; Antenna measurements; Antenna radiation patterns; Dipole antennas; Magnetic domains; Magnetoelectric effects; Microstrip antennas; Ultra wideband antennas; Magneto-electric dipole; time domain characteristics; ultra-wideband antenna; unidirectional patterns;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2013.2276924
