Abstract: A signal distributing/synthesizing apparatus includes a 4-terminal hybrid circuit, first and second antennas, a pseudo-antenna, and first to third 4-terminal switches. The 4-terminal hybrid circuit distributes the signal input to the first terminal to the second and third terminals, and synthesizes the signals input to the second and third terminals into a signal to be output to the first terminal. The first and second antennas form a radio transmission channel for an output signal from the signal 4-terminal hybrid circuit. The pseudo-antenna forms a pseudo-radio transmission channel for an output signal from the 4-terminal hybrid circuit. The first switch complementarily switches/connects a first broadcasting unit and the first antenna to the first terminal of the 4-terminal hybrid circuit and the third switch. The second switch complementarily switches/connects a second broadcasting unit and the second antenna to the second terminal of the 4-terminal hybrid circuit and the third switch.

Abstract: In a method for forming microwave testing high-power dummy load, a first center conductor, to which microwave power is input, is connected to a power distributor formed from a second center conductor having an output-side distal end branching into a plurality of portions. This causes the microwave power input to the first center conductor to separate into a plurality of outputs in correspondence with the output-side distal end of the second center conductor. A plurality of termination resistors are connected between the output-side distal end of the second center conductor and a ground conductor to make the termination resistors consume the microwave power. The heat generated by the termination resistors upon consumption of the microwave power is radiated by the ground conductor. A microwave testing high-power dummy load apparatus made by the above described method is also disclosed.