Shao Yong Zheng

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Previous hybrid couplers have output phase difference that have either been 0<sup>&#x00B0;</sup>, 90<sup>&#x00B0;</sup>, or 180<sup>&#x00B0;</sup>. Other phase differences could only be realized using additional phase-shift elements. This increased circuit size and cost, and also degraded overall performance due to interconnecting mismatch losses. The(More)
This paper presents, for the first time, the design of a size-reduced rectangular patch hybrid coupler. Different types of compact rectangular patch hybrid couplers with different ground plane patterns are described. For demonstration, two compact rectangular patch hybrid couplers are designed to operate at 3.5 GHz. They are measured to have 30.1% and 33.3%(More)
This paper presents, for the first time, the design of a rectangular patch hybrid coupler that can operate at two arbitrary frequency bands with the same quadrature phase relation between the two outputs. The design procedure of the hybrid coupler is presented. For demonstration, a dual-band rectangular patch hybrid coupler is designed to operate in the(More)
A new optimization scheme combined with the space-mapping technology and the jumping-gene genetic algorithm (JGGA) is to replace the conventional direct genetic computational type of the optimization scheme for antenna designs. This utilizes the assumption that there is an equivalent linear mapping between the design-parameter ratio and the response ratio(More)