Compact full-balanced broadband filtering power divider

Abstract

The invention discloses a compact full-balance type broadband filtering power divider which is of a central symmetry structure. Two cascaded three-wire coupling microstrip lines of which the two endsare loaded with chip capacitors and the wavelength is one eighth of that of the chip capacitors and a three-wire coupling microstrip line of which the wavelength is one fourth of that of the chip capacitors are arranged on a top metal layer. A central connection point is arranged between the middle microstrip line and the outer microstrip line of the quarter-wavelength three-wire coupling microstrip lines. Two grooves are formed in the metal ground, two metal patches and an isolation resistor connected with the two metal patches are arranged in the grooves respectively, and the four metal patches are connected with the outer microstrip lines of the two three-wire coupling microstrip lines with the one-eighth wavelength in a one-to-one correspondence mode through plated-through holes respectively. By cascading two three-wire coupling microstrip lines with one eighth wavelength and one three-wire coupling microstrip line with one quarter wavelength and combining the plurality of chip loading capacitors and resistors, the full-balanced broadband filtering power divider with the characteristics of small size, wide frequency band and low loss is obtained.

Description

technical field [0001] The invention relates to the field of microwave communication, in particular to a fully balanced broadband filter power divider. Background technique [0002] In recent years, with the rapid development of wireless communication technology, the requirements for system integration, broadband, miniaturization and low loss are getting higher and higher. As important components in wireless communication systems, filters and power splitters are widely used in many fields such as radar, satellite communication, phased array antenna and array antenna. Integrating the filter and the power divider into one body not only greatly reduces the volume and complexity of the system, reduces the cost, but also improves the communication quality and system integration. In addition, compared with single-ended circuits, fully balanced circuits have attracted widespread attention because they are convenient to connect with other balanced devices, and have good ability to ...

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Problems solved by technology

However, the working bandwidth of the fully balanced filter power splitter using the above design method is narrow, the loss is high, and some designs do not have isolation

A small number of fully balanced filter power splitters adopt the design method of coupling lines cascaded with quarter-wavelength microstrip lines. Compared with the fully balanced filter power splitters designed using the above method, the working bandwidth of this design increase, but its circuit size is too large, the loss is still high

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