Broadband IPD balun chip integrating impedance matching and band-pass filtering functions

A technology of band-pass filtering and impedance matching, which is applied in the field of microwave transmission, can solve the problems of large size of microstrip lines and coupled lines, and achieve the effect of expanding bandwidth, small size, and expanding application scenarios

Inactive Publication Date: 2019-10-25
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

At present, researchers have designed many baluns with filtering function based on microstrip lines or coupled lines. However, due to the large size of microstrip lines and coupled lines in the sub 6GHz frequency band, it is not conducive to their application in RF circuits of mobile terminals. middle

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  • Broadband IPD balun chip integrating impedance matching and band-pass filtering functions
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  • Broadband IPD balun chip integrating impedance matching and band-pass filtering functions

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Embodiment Construction

[0036] In the following, the embodiments of the present invention will be described in detail and clearly in combination with the embodiments and the accompanying drawings.

[0037] The traditional Marchand balun has wideband high-pass characteristics and poor frequency selectivity. In order to improve its frequency selectivity so that it can better shield and suppress out-of-band interference when working at a specific frequency, the present invention uses a low-pass filter to perform impedance Transform to match the input impedance of the input port to that of the Marchand balun. The low-pass filter and the Marchand balun with high-pass characteristics together form a band-pass filter structure to obtain high frequency selectivity.

[0038]In order to allow the present invention to cover the main working frequency band of the 5G communication system at sub 6GHz, the present invention introduces a capacitor at one end of the coupling line of the traditional Marchand balun. By...

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Abstract

The invention discloses a broadband IPD balun chip integrating impedance matching and band-pass filtering functions, and belongs to the field of microwave transmission and the field of integrated circuits. The broadband IPD balun chip takes a GaAs material as a substrate, and MIM capacitors and spiral inductors grow on the substrate. The broadband IPD balun chip comprises an input port and two output ports, wherein the input port is connected with the first spiral inductor through a transmission line and is connected with the first MIN capacitor in parallel at the same time; the first spiral inductor is connected with the second spiral inductor through an air bridge structure, the second spiral inductor is connected with a first coupling inductor and the second MIN capacitor, the first coupling inductor is connected with the first output port and is connected with the second coupling inductor at the same time, and the second coupling inductor is connected with the third MIN capacitor and the second output port. The broadband IPD balun chip has the characteristics of microminiaturization, integration, good band-pass characteristic, low insertion loss and broad band.

Description

technical field [0001] The invention belongs to the field of microwave transmission and the field of integrated circuits, and relates to a passive radio frequency chip, in particular to a broadband IPD balun chip integrating impedance matching and band-pass filtering functions. Background technique [0002] With the development of 5G mobile communication systems, the entire mobile communication industry has begun to explore new frequency bands. At present, many countries around the world have begun to use sub 6GHz spectrum resources for 5G communications. For this reason, researchers need to design radio frequency devices around 3.5GHz and 4.9GHz. In addition, in order to meet the high-speed and large-capacity requirements of 5G communication, communication equipment must have the characteristics of broadband work. [0003] In order to improve the battery life of the terminal, more and more areas of the smart terminal will be occupied by the battery. In the update process o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P5/10H01L27/10
CPCH01L27/10H01P5/10
Inventor 吴永乐杨雨豪王卫民庄正孔梦丹
Owner BEIJING UNIV OF POSTS & TELECOMM
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