A stable gain periodic microstrip leaky‐wave antenna with the open‐stopband eliminated

Abstract

A novel periodic microstrip leaky-antenna (LWA) with the open-stopband (OSB) eliminated and the stable gain is proposed. The energy is radiated mainly through a periodic slot array. Each period of the proposed periodic leaky-antenna (P-LWA) is consist of one transversal slot, two oblique slots, one parasitic patch, one narrow transversal slot and one metallic via.

A periodic meandering microstrip line leaky‐wave antenna with consistent gain and wide‐angle beam scanning

“…However, this type of LWAs suffer from the open‐stop band (OSB) effect when the beam scans through the broadside, causing the degradation of the gain and the deterioration of the reflection coefficient at broadside frequency. To suppress the OSB effect, many related methods have been investigated, including CRLH structures, 29–34 impedance matching methods, 35–37 and asymmetric structures 38–42 . In, 43 it is confirmed theoretically that the OSB effect of the linear polarized period LWA cannot be eliminated if the LWA unit cells are symmetric.…”

AnEH2‐mode microstrip leaky‐wave antenna with single beam radiation and backward‐to‐forward scanning

“…A great deal of LWAs was proposed based on various technologies, such as rectangular waveguide, microstrip line, substrate integrated waveguide, and coplanar waveguide. Since Menzel first proposed a microstrip LWA based on the first higher‐order mode (EH 1 ‐mode) of the microstrip line in the 1970 s, 1 a variety of microstrip LWAs have been developed 2–11 . Based on the different distribution of the transverse electric field, the microstrip LWAs can be divided into two categories, including the fundamental mode (EH 0 ‐mode) 12–14 and the other higher‐order modes 15–27 …”