Zheng Li

TL;DR: In this article, a 3D-printed Luneburg lens with a simplified geometry is presented, where rod-type structures are employed as the unit cell of the gradient-index material to realize the required permittivity distribution in the lens.

TL;DR: In this article, a fixed-frequency beam-scanning leaky-wave antenna (LWA) based on a period-reconfigurable structure is presented, which consists of a slotted substrate integrated waveguide and 54 electrically small patches.

Abstract: A novel circularly polarized (CP) complementary source antenna with endfire radiation is proposed in Ka-band. With the existence of two antipodal notches etched at the edges of the two broad walls of an open-ended substrate-integrated waveguide, two orthogonal electric field components radiated from the equivalent magnetic current, and the electric currents separately can be excited simultaneously. The magnitude and phase differences between the two filed components can be controlled effectively by properly tuning the dimensions of the notches. The operating mechanism and the design procedure of the antenna are analyzed in detail. Wide −10 dB impedance and 3 dB axial ratio bandwidths of 64% and 51%, a gain varying from 3.1 to 6.4 dBic, and the symmetrical radiation pattern are obtained. In order to further increase the gain and front-to-back ratio (FTBR) of the antenna, a dielectric rod structure is then integrated with the antenna. An overlapped operating bandwidth of 41%, an improved gain up to 12 dBic and the stable radiation pattern with an FTBR close to 20 dB are verified by a fabricated prototype. The antenna presented in this paper provides a new mean to design the wideband endfire CP antenna with a simple configuration, which would be attractive for future millimeter-wave wireless systems.

TL;DR: In this article, a novel kind of composite patch antenna is proposed, in which the mushroom-like electromagnetic band-gap (EBG) structure is integrated onto the conventional patch, and the composite patch as a whole acts as the radiating part of the antenna.

TL;DR: In this paper, a millimeter-wave (mmW) low profile wideband magneto-electric (ME) monopole antenna with the vertically polarized endfire radiation is presented by combining a pair of top-loaded electric monopoles with a thin open-ended substrate integrated waveguide (SIW) with the extended lower broad wall.