Abstract
This paper introduces analytical solutions to gap waveguide slot antenna structures. The reciprocity method is used for the analysis by exploiting Green’s function of a bed of nails structure employing a homogenized plane-wave spectral-domain approach. Green’s function is found using parallel plate waveguide and surface admittance concepts. The spectral surface admittance of the pin structure is calculated using asymptotic boundary condition (ABC), and the unknown antenna slot currents are solved using moment methods. The structure is designed to have a cutoff frequency of 10–15 GHz, and the central operating frequency of the slot is 12.5 GHz. This approach is applied to the specific geometry of a propagating ridge gap waveguide single transverse broad wall slot antenna structure. The equivalent series impedance and far zone fields and patterns are calculated, and the results are compared with a full-wave commercial software, and they are proved to be accurate.
Highlights
Waveguide slot antennas are an essential category of microwave antennas
Array antennas have a variety of forms, including circular and rectangular parallel plate waveguide slot arrays [3], [4], substrate integrated waveguide slot arrays [5], and gap waveguide slot arrays [6]
Motevalli et al.: Reciprocity Method of Analysis for Gap Waveguide Slot Antennas the perfect magnetic conductor (PMC) surfaces, the waves can propagate along the path locally
Summary
Waveguide slot antennas are an essential category of microwave antennas. These antennas are of continued interest in modern applications such as ground and airborne radar systems, remote sensing, and communications due to their low loss and high power handling capability. Advantages of low cost and are easier to fabricate and integrate with active microwave components They have problems such as increasing dielectric loss and the excitation of surface waves with higher frequencies. Motevalli et al.: Reciprocity Method of Analysis for Gap Waveguide Slot Antennas the PMC surfaces, the waves can propagate along the path locally. Electromagnetic fields can be derived for any electric or magnetic infinitesimal current source [19] This structure can be analyzed through a mode-matching technique, in which every pin in the lower plate is seen as a scatterer. The reciprocity method is used and applied to the ridge gap waveguide with a single transverse slot to find the electromagnetic fields and series impedance of the slot. The results are compared to a commercial electromagnetic package (CST)
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