Abstract
AbstractThe spectral domain analysis of microstrip couplers with lateral ground strips can be conducted following two different approaches: assuming the lateral strips are continuously short‐circuited to ground or discretely bonded to the reference ground conductor at the coupler ends. In this paper, the second approach is used: The wave number and the characteristic admittance of the central strip propagation made of a coplanar three‐conductor microstrip transmission line are determined and shown to depend critically on the coupler length. The spatial evolution of microstrip voltages and currents inside the coupler is also determined and discussed. The results show that noticeable standing wave effects are present when the coupler length comes close to an integer multiple of one‐half wavelength.
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