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Broadside Scanning Asymmetric SIW LWA with Consistent Gain and Reduced Side Lobe
摘要： In this paper, a backwards-to-forward continuous beam scanning leaky wave antenna (LWA) is presented in substrate integrated waveguide (SIW) technology. The antenna radiates from a continuous longitudinal slot etched on its broad wall. The slot is excited by using periodic H-plane steps. An impedance matched unit cell structure is used to suppress the open stop-band in the broadside direction. Bloch wave analysis is used to obtain the propagation characteristics of the antenna. However, due to radiation being obtained only from the shunt type radiating element viz., the longitudinal slot, a gain dip is observed in the broadside direction. Transversal asymmetry is then introduced in the structure to eliminate the gain dip and obtain consistent gain. A prototype of the antenna is fabricated and measured. Continuous beam scanning is achieved from –29o to +30o about the broadside direction with a gain variation of less than 2 dB over 8.0–12.4 GHz. A measured peak gain of 16.1 dBi is obtained. Key structural design parameters of the antenna are identified for controlling the leakage rate. Next, Taylor tapered aperture illumination is used to obtain low sidelobe level (SLL). The Taylor tapered antenna is also fabricated with the measured SLL below -21 dB.
关键词： substrate integrated waveguide (SIW),broadside radiation,Taylor distribution,Leaky-wave antenna (LWA)
更新于2025-09-23 15:21:21
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1-D Leaky-Wave Antenna with Scanning Through the Broadside Based on Sinusoidally-Modulated Reactance Surface
摘要： A dispersion diagram (DD) and radiation property in a wide-band frequency range are considered for a periodic leaky-wave antenna (PLWA) based on artificial reactance surface (ARS). In the first step, the surface impedance versus gap spacing over a wide frequency band is obtained using full-wave simulation results. In the second step, the frequency dependency effect of ARS on DD of PLWA in the special frequency band is theoretically analyzed. The new DD provides a simple way to analyze the radiation beam angle in a wide frequency band for these types of periodic structures. To mitigate and almost eliminate the open stop band, special parameters of sinusoidally-modulated ARS are theoretically analyzed and the results show how to achieve minimum variations in attenuation near the broadside. By nearly eliminating the open stop band’s behavior, the proposed antenna is able to scan through the broadside without any rapidly varying attenuation. Simulation and measurement results of the proposed antenna validate the theoretical analysis.
关键词： broadside radiation,dispersion diagram,periodic leaky-wave antenna,open stop band,artificial reactance surface
更新于2025-09-09 09:28:46