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A reconfigurable output power 4×4 Butler matrix consisted of four adjustable output power ratio branch line couplers and two 45 degree phase shifters is proposed. The adjustable output power ratio branch line coupler is accomplished by simply changing the values of two shunted capacitors. The simulated antenna factors of four different inputs changes as predication are also presented.
A mixed type branch line coupler combining T-type and pi-type equivalent circuits and keeping main lines characteristic impedance at 50Ω is reported. The new branch line coupler contains only capacitors and open stubs. Two prototypes of two and three branches are designed, simulated and measured. The size reduction reached 40% comparing with the original circuits. The simulated and experimental results...
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