Microwave power distributor with multiple power distributing ratios

Abstract

This invention relates to a microwave power splitter having multiple kinds of power splitting ratios, in which, the microstrip lines of said power splitter form a square, every edge of which is connected by two equivalent 1 / 4 wavelength lines, the cross points of two equivalent 1 / 4 wavelength lines at the right and left of the square are connected by an equivalent 1 / 2 line and the property impedance, the electric length and loaded capacitance value are determined by the output power distribution ratio of the power splitter, which gets high isolation without using any isolation resistors and the stationary ratio is good.

Description

technical field [0001] The invention relates to a microwave power splitter, in particular to a microwave power splitter with a microstrip line in a square structure and utilizing capacitive loading technology with various power distribution ratios. Background technique [0002] The full name of microwave power divider is microwave power divider, which is widely used in microwave circuits, especially microwave integrated circuits. At present, for small and medium power two-way microwave power splitters, most of them use microstrip three-port power splitters. For a three-port power divider with no loss and reciprocity, it is impossible for the three ports to match at the same time, so the Wilkinson structure is generally used, and isolation resistors are used to improve the isolation between ports and the matching of each port. For multi-channel microwave power splitters, a common method is to use multiple power splitters divided into two for cascading expansion to obtain pow...

AI Technical Summary

Problems solved by technology

However, the design of these two power splitters must consider the electrical length, that is, when the center frequency is determined, their geometric dimensions are also determined. Once the operating frequency deviates from the center frequency, the VSWR, isolation and balance of the two outputs And other indicators deteriorate, so the working frequency band is narrow

From 2002 to 2003, Maximilian C.Scardelletti and B.Piernas et al. proposed to use capacitive loading technology to reduce the size of the Wilkinson power divider. The focus is to reduce the length of the 1 / 4 wavelength microstrip line, but isolation resistance is still required. In terms of circuit topology, it is still based on the Wilkinson structure and its variants

Since each segment line in this structure is an integer multiple of 1 / 4 wavelength, once the working frequency deviates from the center frequency, the index will deteriorate, so the frequency band of this power divider is narrow

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