Abstract
Abstract. The presented "open" composite left-handed/right-handed (CRHLH) substrate integrated waveguide performs well as a low-profile leaky wave antenna. This design is distinguished due to the fact that it is derived from the approved equivalent circuit model of the H10 rectangular hollow waveguide mode. The wave propagation behaviour is visualised by the dispersion diagram calculated by two different methods, infinite periodic full-wave simulation and Matrix-Pencil analysis of driven field solutions. The periodic configuration is also analysed in terms of the Bloch impedance. Although FR-4 serves as substrate the antenna features an efficiency of about 50% to 60%. The radiation performance demonstrates nearly backfire to almost endfire scanning capability of the antenna by mere frequency variation. Broadside radiation is possible due to the balanced state at 4 GHz.
Highlights
The presented leaky-wave antenna is attractive as conformal antenna
A broadband conformal leaky-wave antenna was presented which is continuously scannable from nearly endfire to backfire including broadside radiation
The presented design is based on the H10 rectangular hollow waveguide mode, which was upgraded to a composite left-/righ-handed mode by introducing transverse slots with narrow spacing
Summary
The presented leaky-wave antenna is attractive as conformal antenna. Having a low profile, it achieves a relatively high gain due to its large aperture. Important is that this EQC is very close to the aimed EQC of the CRHLH configuration since only the series capacitors are missing. The wave nature is investigated and illustrated by the dispersion diagram validated by two separate techniques, full-wave simulation of the infinite periodic configuration and the Matrix-Pencil estimation technique. The latter is applied to the field distribution of the gained driven solution. The measurements of a prototype reinforce the simulation results obtained by CST Microwave Studio
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