A waveguide power combiner is a passive device used to combine the power of multiple RF or microwave signal sources into one output path. This device is widely used in applications where the power of multiple signal sources needs to be efficiently combined, such as radar systems, communication base stations, electronic countermeasures equipment, etc. Waveguide power combiners can be designed into a variety of topologies, including but not limited to Wilkinson power dividers/combiners, branch line couplers, circulators, and Magic-T.

　　The following are several common waveguide power combiners and their characteristics:

　　Wilkinson Power Divider/Combiner:

　　Named after its inventor Ernest Wilkinson, this combiner provides good port isolation and can achieve zero reflection under ideal conditions.

　　It usually consists of two branches of equal impedance, each of which is connected to a quarter-wavelength matching resistor to absorb unbalanced signals, thereby ensuring high isolation between the input ports.

　　Branchline Coupler:

　　A branchline coupler uses two mutually perpendicular transmission lines to achieve power distribution or combination at the intersection.

　　It has a 90-degree phase difference characteristic, which is very useful in some applications, such as orthogonal modulation and demodulation.

　　Circulator:

　　A circulator is not a typical power combiner, but it can be used to build a power combiner, especially when unidirectional operation is required.

　　It has three or four ports, and the signal can only be transmitted from one port to the next port in a predetermined direction, but not in the opposite direction.

　　Magic-T:

　　The magic-T is a special configuration of waveguide that combines the E-plane and H-plane T-junctions to effectively combine signals from different directions without reflection.

　　It can be used for a variety of applications such as power combination and signal separation.

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