Wideband Wide Beamwidth Full-Wavelength Sectorial Dipole Antenna Under Dual-Mode Resonance

Dual-Resonant High-Gain Wideband Yagi-Uda Antenna Using Full-Wavelength Sectorial Dipoles

“…1 (a). The flared angle of the principal dipole is set as 270° [39]. In order to determine the distance between the director and the principal radiator as well as the radius and flared angle of the director, a six-source model is developed and shown in Fig.…”

“…Suppose the antenna will be designed on dielectric substrate with relative permittivity of ε r = 2.65 at the center frequency of 2.4 GHz. The radius and flared angle of the principal sectorial dipole can be calculated by (2) [40], where ε e is relative dielectric constant that can be estimated by empirical expressions indicated in [41], ν is the circumferential eigen-number determined by the flared angle α, and χ ν1 is the first root of the first-order derivative of the ν-order Bessel function of the first kind, respectively [39,40]. When the flared angle is set as β = 270° [39], the radius can be initially calculated as R 0 = 26.5 mm [42].…”

“…To maintain the antenna's balanced configuration, a dummy cable should be attached to the other arm. A pair of open-circuited, tuning stubs with lengths of L 1 , L 2 and widths of W 1 , W 2 can be introduced on the periphery of the sectorial principal radiator to perturb the second odd-order resonant mode and to yield dual-resonant characteristic [39]. (a) Parametric studies on three design parameters of W, L 3 and W 3 have been performed to validate the theoretical results by using the HFSS simulator, with the results given in Fig.…”

“…To our best knowledge, there are no reported Yagi-Uda antennas, which are comprised by full-wavelength dipoles, so far. Recent studies have revealed that both 1-D and 2-D full-wavelength dipoles [36][37][38][39] can exhibit better performance than the half-wavelength dipole, such as wider bandwidth [36,39], higher gain [37][38], and improved polarization purity within the whole beamwidth [39]. Therefore, it is highly expected that a novel class of wideband, high gain Yagi-Uda antennas can be presented, designed and implemented by using multi-resonant, 2-D full-wavelength sectorial dipoles [39].…”

“…IEEE Open Journal of Antennas and Propagation dipoles. The antenna is composed of a full-wavelength, principal sectorial radiator, a circular metallic flat reflector, and a full-wavelength sectorial director [39]. At first, a multi-source model is developed to calculate the initial parameters of the antenna.…”