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Distributed miniature band-pass balance filter

A technology of balanced filter and micro-strip, applied in the field of filter, to achieve the effect of flat in-band, high reliability and excellent electrical performance

Inactive Publication Date: 2013-11-27
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is an important issue to design the balanced filter as a single device without adding an additional balun

Method used

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  • Distributed miniature band-pass balance filter
  • Distributed miniature band-pass balance filter
  • Distributed miniature band-pass balance filter

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Embodiment Construction

[0011] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0012] combine figure 1 , a distributed miniature bandpass balanced filter of the present invention, the miniature bandpass balanced filter package includes a surface-mounted 50 ohm impedance input port P1, an input inductance Lin, a first-stage parallel resonant unit L1 C11 C12, a second Level parallel resonance unit L2 C21 C22, third level parallel resonance unit L3 C31 C32, fourth level parallel resonance unit L4 C41 C42, first Z-shaped inter-level coupling stripline LC1, second Z-shaped inter-level coupling stripline LC2, the first output inductor Lout1, the surface-mounted 75-ohm impedance balanced output port P2, the second output inductor Lout2, the surface-mounted 75-ohm impedance output port P3; the input port P1 resonates in parallel with the first stage through the input inductor Lin The second-layer stripline L1 in the unit is connected, the bala...

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Abstract

The invention discloses a distributed miniature band-pass balance filter which comprises a surface mounted 50-ohmage resistance input port, four parallel resonance units, two surface mounted 75-ohmage resistance output ports and a grounded terminal. The input port is connected with the first-stage parallel resonance unit. The two output ports are connected with two strip lines of the fourth-stage parallel resonance unit respectively. The strip lines of the first-stage parallel resonance unit, the second-stage parallel resonance unit, the third-stage parallel resonance unit and the fourth-stage parallel resonance unit are respectively grounded at one end and provided with an open circuit at the other end. Two ends of two Z-shaped interstage coupling strip lines are both grounded. The distributed miniature band-pass balance filter has the advantages of being small in size, light in weight, high in reliability, excellent in electrical performance, simple in circuit implementation structure, low in cost and convenient to use and install.

Description

technical field [0001] The invention relates to a filter, in particular to a distributed miniature band-pass balanced filter. Background technique [0002] In modern wireless communication systems, balancing circuits play an important role. Compared with unbalanced single-port input and output circuits, balanced circuits can efficiently suppress environmental noise and noise generated by internal active devices, and thus have superior electromagnetic compatibility characteristics. Various RF microwave devices such as filters, mixers and power amplifiers are used in balanced topologies. With the rapid development of integrated circuits, the demand for balanced devices will become more urgent. The balanced filter is required to have filtering characteristics when the differential mode signal is input, and can effectively suppress the common mode noise at the same time. A balanced filter can be easily constructed with a one-port filter and two baluns, but its area is huge. ...

Claims

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Application Information

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IPC IPC(8): H01P1/20H01P1/203
Inventor 戴永胜陈相治李雁邓良施淑媛陈龙朱丹罗鸣冯辰辰方思慧顾家朱正和
Owner NANJING UNIV OF SCI & TECH
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