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For a leaky waveguide with periodic slots cut in the wall, the guided wavelength can be expressed as: λg = λ0/√εg. (1) Here, εg is an equivalent dielectric constant of the leaky waveguide, and is expressed by εg = εr − (λ0/λc')2, (2) where εr is the dielectric constant of the material filled in the waveguide, and it equals 1 when no dielectric is filled; λ0 is the wavelength in free space, and λ'c...
Two new broadband CP reflectarray elements operating at 15 GHz are proposed and two reflectarrays with the corresponding elements are simulated. The results of a traditional reflectarray consisting of the split ring element at 15 GHz are presented for comparison. As the results show that the bandwidths of the proposed elements and reflectarrays are improved efficiently compared to the split ring element...
A compact directional coupler with rectangular apertures, which are arranged in a fishbone configuration for high power systems, is designed. The proposed design can be applied to small size microwave interspaces and realize low coupling between waveguide and microstrip line with parallel axes by multi-aperture. In this paper, we present a C band novel directional coupler with low coupling of 40 dB...
This paper presents a new broadband metal-only reflectarray antenna. The designed reflectarray antenna operating at 12.5 GHz doesn't contain any dielectric substrate by using a modified slot structure. The slot-type element is optimized to provide a linear phase curve and a phase-shift range in excess of 360 degrees is achieved. With an offset feed configuration, a 9×9 elements reflectarray antenna...
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