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This letter presents a novel topology of a Butler matrix, which can realize relatively flexible phase differences at the output ports. The proposed Butler matrix employs couplers with arbitrary phase-differences to replace quadrature couplers in the conventional Butler matrix. By controlling the phase differences of the applied couplers, the progressive phase differences among output ports...
In this paper, we present a dual-band Sequential Power Amplifier (SPA) to provide high efficiency at power back-offs and maximum output power at two working frequencies. The proposed SPA consists of a carrier amplifier, a peaking amplifier, a power divider and a combining coupler. The SPA provides 48 % and 62 % drain efficiency (DE) at 6 dB output back-off (OBO) and maximum output power at 1.1 GHz,...
In this paper, we present the system applications of planar couplers. A uni-planar 3dB 180° coupler with fully symmetrically allocated input and output ports is designed for this purpose. Different from the conventional rat-race coupler, it integrates a compact crossover with a modified conventional coupler to rearrange the Σ, Δ, coupling, and through ports of the 180° coupler. The full-wave electromagnetic...
Two kinds of reconfigurable microwave couplers are presented in this paper. The first one is a 90-degree branch-line coupler with a wide range of tunable coupling ratios. Especially, when its coupling ratio is tuned to be 1, this coupler becomes a crossover. The second one possesses a reconfigurable performance between a rat-race coupler and a 90-degree coupler. Both of the devices have a symmetrical...
A novel design of tri-band branch-line couplers using tri-band transmission lines is presented in this paper. The proposed tri-band transmission line employs a Pi-type line with open- and short-ended stubs. The line with Pi-type structure is applied to realize the dual-band operation at the first two frequencies (f2/f1). To achieve the third operating frequency ratio (f3), the open- and short-ended...
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