A novel wideband, triple-resonant sectorial dipole antenna with simple configuration is advanced. The antenna is evolved from a 1.5-wavelength prototype electric dipole, which is backed by a circular metallic planar reflector. The flared angle of the sectorial radiator and the corresponding usable resonant modes for wideband radiation is determined by mode synthesis chart. As numerically and experimentally validated, the flared angles of the principal dipole should be 300 , with its radius approximately equal to 0.23-wavelength centered at 2.4 GHz. By introducing a pair of tuning stubs and a pair of slits along circumference, three resonant modes simultaneously excited in a single sectorial dipole to generate a wideband, tripleresonant radiation characteristic. Prototype antennas are then fabricated to experimentally validate the design approach. It is shown that the proposed antenna exhibits a unidirectional pattern with its impedance bandwidth over 73.3%. Meanwhile, stable radiation patterns with gain fluctuation less than 2.4 dB, low cross polarization level of À27 dB, and maximum gain of 6.9 dBi are realized within the same frequency range.
A novel design approach to high-gain, wideband, dual-resonant, closely-spaced, three-element Yagi-Uda antenna is advanced. The antenna is comprised by a full-wavelength, principal sectorial dipole, a circular metallic flat reflector, and a sectorial director. At first, a multi-source model is developed to predict the initial values of the key antenna parameters, e.g., the flared angle/radius of the director, and the separation between them. Then, as theoretically predicted, numerically simulated and experimentally validated, the flared angles of the principal radiator and the director are eventually determined as 270° and 180°, respectively. They are further tightly coupled at a close separation of 0.024-wavelength to yield relatively compact size and high gain simultaneously. Prototype antenna with a circular metallic reflector successfully exhibits an impedance bandwidth up to about 40%, with in-band maximum gain up to 10.4 dBi and gain fluctuation less than 3 dB. Finally, the antenna is comparatively studied with other Yagi-Uda antennas to highlight its unique wideband and high gain characteristics. Index Terms Wideband antenna, Yagi-Uda antenna, full-wavelength dipole antenna, dual-mode resonance, high gain antenna.
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