Rotation-Free Far-Field Gain Measurement of Linearly-Polarized Antennas Using Artificial Anisotropic Polarizers

A novel rotation-free far-field gain measurement method of linearly-polarized (LP) antennas using artificial anisotropic polarizers (AAP) is proposed in this paper. No rotation to antenna feed is required during the measurement. Measurements for a rectangular linearly-polarized horn operating between 50 to 67 GHz have been conducted for verification at different E-plane angles. The measurement method is useful for gain measurements of linearly-polarized antennas especially at millimeter-wave and terahertz range

A Wideband Low Profile Millimeter-Wave Antenna Fed by SICL

A wide band low profile magneto-electric (ME) dipole working in millimeter wave band is presented in this paper.  Different from conventional ME dipoles using the vertical wall as magnetic dipoles, the proposed antenna’s magnetic dipole is composed of the aperture between the patches of the electric dipole. As a result, the profile of the ME dipole can be much lower than conventional ones. The proposed ME dipole antenna is fed through the ground slot by the substrate integrated coaxial line (SICL), which can significantly enhance the backside lobe performance. A simulated impedance bandwidth of 48.5% (26-42 GHz) and a gain up to 9 dBi can be achieved with a profile of about 0.12 λ0. Additionally, symmetric radiation patterns with back lobe lower than -23 dB over the operating band can be obtained. With the advantage of wide working band, low profile and low backside radiation, the proposed antenna would a good candidate for millimeter wave antenna in package (AiP) applications

Complex-source-point theory of the higher-order modes in an open resonator

published_or_final_versionElectrical EngineeringDoctoralDoctor of Philosoph

360° beam-steering reconfigurable wideband substrate integrated waveguide horn antenna

A novel beam-steering reconfigurable substrate integrated waveguide (SIW) horn antenna is presented. By employing p-i-n diodes as tuning mechanisms, the states of copper posts of the SIW horn can be electronically controlled. Accordingly, the aperture direction of the horn can be switched, and a 360° beam-scanning ability is realized. A pair of bowl-shaped reflectors is introduced for achieving a wide impedance bandwidth and good directional radiation patterns. A fully functional prototype with a 26.2% impedance bandwidth is developed and tested, demonstrating the antenna with a measured gain varying between 8 and 10 dBi and a radiation efficiency of approximately 75% over the impedance band. Moreover, owning to its symmetrical structure, the proposed antenna is capable of steering the radiation beam every 22.5° with identical radiation patterns in the H-plane