Butterfly microstrip filtering power divider

Abstract

The invention discloses a butterfly microstrip filtering power divider, and belongs to the technical field of communication. The power divider has a filtering function on the basis of power division,and has the advantages of good in-band insertion loss and isolation, small size, simple design and the like. Compared with a traditional Wilkinson power divider, the power divider has the advantages that the parallel coupling lines are mainly adopted to replace quarter-wavelength transmission lines in the power divider, and open-circuit stub lines of step impedance are added, so that the defects of harmonic response and poor out-of-band rejection of the Wilkinson power divider are overcome. The parallel coupling line structure is used for realizing a filtering function and obtaining better port matching; by adjusting the impedance ratio of the step impedance open-circuit stub, the first transmission zero points on the two sides of the transmission pass band of the filtering power divider can be moved, and therefore the high-frequency selection characteristic is achieved. Finally, a real object made by taking Rogers5880 as a substrate material has the advantages that the measured centerfrequency is 3GHz, the relative bandwidth is 56%, the passband insertion loss is less than 0.34 dB, the return loss is superior to 17dB, the port isolation is higher than 18.7 dB, and the overall size is 43mm * 44mm.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a butterfly-shaped microstrip filter power divider. Background technique [0002] In communication and radar systems, the power divider is one of the important components. The full name of the power divider is a power divider, which is a device that divides the energy of an input signal into two or multiple channels to output equal or unequal energy, and can also conversely combine the energy of multiple channels into one output, which can also be called at this time. Combiner. A certain degree of isolation should be guaranteed between the output ports of a power divider. The technical indicators of the power divider include frequency range, withstand power, distribution loss from main circuit to branch, insertion loss between input and output, isolation between branch ports, voltage standing wave ratio of each port, etc. [0003] Filters are also very import...

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Problems solved by technology

However, the passband of the Wilkinson divider periodically appears

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