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A wideband circularly polarized (CP) dielectric resonator antenna (DRA) with filtering response was proposed in this communication. To combine additional filtering and harmonic suppression functions within an antenna while realizing circular polarization, a new wideband filtering quadrature coupler was implemented to feed a hollow DRA. The filtering quadrature coupler was based on a snowflake shaped...
The existing designs of Butler matrices are all based on microstrip lines, which may cause performance degradation when the operation frequency increases. To solve this problem, this article presents the design and realization of Butler matrix based on patch element. In order to achieve wideband and simple structure features, the circuit utilizes couplers with arbitrary phase difference and a novel...
Two output structures constructed by multiple apertures in E-and H-planes were designed for a W-band broadband sheet beam traveling wave tube (TWT). E-plane coupler can achieve 32% relative bandwidth and perform excellent port isolation. In comparison, another output coupler built by multi-aperture in H-plane was demon-strated, which is much convenient for PCM focusing system and can be easily integrated...
A novel vertically installed planar structure with patterned ground plane had been presented in this paper. It eliminates the existing limitations of conventional vertically installed planar structure, resulting in a simple structure with less fabrication efforts. For demonstration purpose, a 3-dB hybrid coupler was designed based on the proposed improved structure. It was measured to have a good...
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