High frequency signal adder

The paper presents the results of the development and investigation of the frequency properties of a wide-band adder of high-power high-frequency signals. The adder is intended for the construction of multichannel RF and microwave amplifiers used in transmitting de-vices of radio engineering systems, telecommunications, communica-tion systems, digital terrestrial television broadcasting, electronic war-fare equipment, as an equivalent antenna, as well as in medical equipment. This paper presents a two-input adder based on three co-axial or microstrip transmission line segments with the same 50 ohm impedance. At the same time, all three segments have a length of less than a quarter of the wavelength, which significantly reduces the weight and size indicators. The use of coaxial or microstrip transmis-sion line segments with a wave resistance of 50 ohms to build the adder ensures the operation of the adder at an input power level of several kW and significantly simplifies the design. By introducing shortening capacitors into each segment of the transmission line, the effect of the parasitic capacitance of a powerful film-type ballast re-sistor is neutralized and high-quality matching in the frequency band of up to 15% is achieved. Based on the considered adder, high-power multi-input summing microwave systems can be implemented.