Two wide-angle scanning linear array antennas (E-and H-plane scanning linear array antenna) are studied and presented. In order to improve the wide-angle scanning performance of the phased array antenna, a wide beam-width U-shaped microstrip antenna with the electric walls is designed. The wide-angle scanning linear array antennas are studied in the frequency band from 3.2 to 3.8 GHz. The 3-dB beam-width of the antenna is 140° in the E-plane scanning linear array center and 220° in the H-plane scanning linear array center at 3.5 GHz. The main beams of the H-plane scanning linear array antenna can scan from −90° to +90° with a gain fluctuation less than 3 dB and a maximum sidelobe level (SLL) less than −5.0 dB. Simultaneously, the main beam of the E-plane scanning linear array antenna can scan from −75° to +75° with a gain fluctuation less than 3 dB and SLL less than −5.0 dB. The H− and E-plane scanning linear array antennas with nine elements are fabricated and tested. The measured results have a good agreement with the simulated results.

In this paper, a wide scanning-angle leaky wave antenna (LWA) based on a microstrip spoof surface plasmon polaritons (SSPPs) transmission line (TL) is proposed. The dual-conductor SSPPs-TL as the guiding-wave structure of the proposed antenna consists of a two-edged grooved corrugated strip and a ground plane. A set of metallic posts connect the corrugated strip to the ground plane along two sides of the SSPPs-TL in a staggered way, which converts SSPPs to radiation waves. A power divider is the feeding network for 2 antenna arrays. The scanning region is mainly controlled by the depth of the groove, which has strong relationship with the dispersion of the antenna. Over the operating band from 5 GHz to 7 GHz, the beam of the proposed antenna scans widely from -30° to 51° (including the broadside) with the realized gain varying from 15.9 dBi to 19.4 dBi. A prototype is fabricated and measured, which confirms the design theory and the simulation results.

A compact dual-band substrate integrated waveguide (SIW) slotted array antenna is presented in this paper. The proposed antenna has two layers. The bottom layer is for a 2$\times$6 longitudinal slotted rigged SIW (RSIW) array resonating at the X-band. The top layer is for a 4$\times$8 longitudinal slotted SIW array working in the Ku-band. Two SIW power dividers are employed as the feeding networks for two slotted arrays. The effects between two antennas are analyzed. The lower and higher band Antennas on two different layers can be designed separately, which have good abilities to work independently in X-band and Ku-band, respectively. The -10 dB impedance band is 9.4 ~ 10 GHz in X-band and 14.5 ~ 15.2 GHz in Ku-band. Over the impendence band, the maximum gains are 14.5 dBi in the lower-band and 17.5 dBi in the upper-band.