| 摘要 |
PURPOSE: A switchable combiner with improved phase imbalance is provided to accomplish impedance matching at a contact even when combination path is changed. CONSTITUTION: A switchable combiner comprises many input ports(Pi1,Pi2,Pi3), an output port(Po), many switch bars(B1,B2,B3), a first contact(21), a fixed switch bar(B4), a second contact(22), an N path switch bar(B7,B5,B8,), an N path impedance line(24), a third contact(23) and a control signal port. The switch bars(B1,B2,B3) are coupled to the input ports(Pi1,Pi2,Pi3) and function as signal transfer paths. The first contact(21) selects any one of the input ports(Pi1,Pi2,Pi3). The fixed switch bar(B4) transfers a signal combined at the first contact(21). The second contact(22) connects the impedance line according to the number of paths combined at the first contact(21). The second contact(22) connects the impedance line according to the number of paths combined at the second contact(22). The N path impedance line has impedance according to the number of paths combined at the first contact(21). The third contact(23) connects the N path impedance line to the output port. The control signal port controls switches of the first to the third contact.
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