Abstract
In this paper, novel compact high gain broadband leaky-wave antenna (LWA) using TE220 high-order mode is proposed. The high-order mode antenna not only possesses more compact structure with higher gain, but also simplifies the feeding network of the antenna array and relaxes processing tolerance. The radiation element consists of an SIW cavity etched with 2×2 slot array on the top surface, which is excited by a microstrip-slot coupling structure. Microstrip spoof surface plasmon polariton (SPP) is worked as a slow-wave transmission line (TL) to increase the beam scanning range of a four elements periodic array antenna. The antenna was simulated, optimized and fabricated, which verified theoretical analysis. Experimental results show that the linearly polarized (LP) beam scanning antenna has a bandwidth of 53.5% (from 12.6 GHz to 21.8 GHz) with beam scanning range from -24° to +32° and gain in the range of 10.2 dBi to 12.4 dBi. Then a linear-to-circular polarization converter is loaded to implement a circular polarization (CP) beam scanning antenna. The proposed antenna has the features of compact size, low profile, high gain, large beam scanning range and flexible polarization conversion.
Highlights
With the rapid development of satellite communication and wireless communication, beam scanning antenna with compact size, low profile, high gain and wide scanning range has been widely used [1]
Spoof surface plasmon polariton (SPP) slow-wave transmission line (TL) is worked as a feeding structure to increase the beam scanning range of the four elements periodic array structure
It is excited by microstripslot coupling structure and electromagnetic wave is coupled out of substrate integrated waveguide (SIW) cavity by 2 × 2 slot array etched on the top surface
Summary
With the rapid development of satellite communication and wireless communication, beam scanning antenna with compact size, low profile, high gain and wide scanning range has been widely used [1]. The TL structure with slow-wave dispersion characteristics can produce larger phase difference between adjacent radiation elements within the same frequency band, enlarging the beam scanning range. We consider using the high-order modes in SIW with slots etched on top surface as radiation elements to design LWA with high gain performance.
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