Non-uniform power divider with integrated band-pass filtering function

Abstract

The invention discloses a non-uniform power divider with an integrated band-pass filtering function. The non-uniform power divider comprises an upper-layer micro-strip structure, an isolating element, a middle-layer medium substrate and a lower-layer grounding metal plate. The non-uniform power divider with the integrated band-pass filtering function comprises two single-frequency band-pass filtering circuits and the isolating elements connected between the two single-frequency band-pass filtering circuits. Input impedance and output impedance of the non-uniform power divider are identical, and input impedance and output impendence of each single-frequency band-pass filtering circuit can be regulated by changing coupling strength among corresponding resonators and positions of corresponding ports, so that power can be divided according to different ratios, and matching can be realized. A quarter-wave impedance conversion section required at an output port of the traditional Wilkinson non-uniform power divider can be omitted, so that the size of the non-uniform power divider is effectively reduced. The non-uniform power divider can be used in various radiofrequency front-end systems, has a power dividing function and a frequency selecting function, and is beneficial to integrating and minimizing devices.

Description

technical field [0001] The invention relates to a power divider with filter function, in particular to a non-equal power divider with integrated single-frequency band-pass filter function applicable to radio frequency front-end circuits. Background technique [0002] Power splitters are a fundamental part of microwave circuits and are used in many antenna arrays and balanced circuits because of their ability to separate and combine signals. The band-pass filter circuit is another indispensable part in the wireless communication system, because it can separate the required frequency band. Both elements are present in many microwave systems. [0003] In the past few decades, there has been a lot of research on power dividers. The focus of the research is widening the frequency band, reducing the area, dual frequency response and harmonic suppression. At the same time, band-pass filter circuit is also an important research field in passive circuit design. Single-passband an...

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Problems solved by technology

In D. Hawatmeh, K.A. Shamaileh and N. Dib, “Design and Analysis of Compact Unequal-Split Wilkinson Power Divider Using Non-Uniform Transmission Lines,” Applied Electrical Engineering and Computing Technologies, pp.1-6, Dec, 2011. In the paper, the author replaces the traditional uniform transmission line with a non-uniform transmission line, which effectively reduces the size, but this structure still needs to add a quarter-wavelength impedance transformation section at the output port position, the size cannot be further reduced, and there is no filtering function

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