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Compact micro-strip balance filter based on slotted line structures

A balanced filter and filter technology, which is applied in the field of communication, can solve the problems of complex design of broadband balanced filters, etc., and achieve high common-mode signal suppression capability, easy processing, and small size.

Inactive Publication Date: 2014-07-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The design of broadband balanced filter is relatively complicated, because it is difficult to achieve a high suppression effect on common mode signals in a wide frequency band

Method used

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  • Compact micro-strip balance filter based on slotted line structures
  • Compact micro-strip balance filter based on slotted line structures
  • Compact micro-strip balance filter based on slotted line structures

Examples

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Embodiment Construction

[0025] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] A compact microstrip balanced filter based on a slotted line structure, comprising a first filter and a second filter formed on a dielectric substrate, and both the first filter and the second filter include a filter located on the upper layer of the dielectric substrate The microstrip line structure and the slotted line located in the lower layer of the dielectric substrate, the first filter and the second filter have the same structure and are symmetrical to each other, the slotted line of the first filter is connected as a whole with the slotted line of the second filter .

[0027] In this embodiment, a PCB with a relative permittivity of 2.2 and a thickness of 0.508 mm is used as the dielectric substrate. Such as figure 1 Shown is a schematic cross-sectional view of the single-layer printed circuit board of the present inventio...

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Abstract

The invention discloses a compact micro-strip balance filter based on slotted line structures. The compact micro-strip balance filter based on the slotted line structures comprises a first filter and a second filter, wherein the first filter and the second filter are formed on a dielectric substrate The first filter and the second filter respectively comprise a micro-strip line structure located on the upper layer of the dielectric substrate and a slotted line located on the lower layer of the dielectric substrate. The first filter and the second filter are the same in structure and are symmetric mutually. The slotted line of the first filter is integrally connected with the slotted line of the second filter. The compact micro-strip balance filter has a very wide difference mode signal passband which internally has the very high common-mode rejection characteristic, a circuit is simple, and machining is easy.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a compact microstrip balanced filter based on a slotted line structure. Background technique [0002] The rapid development of modern communication systems puts forward higher requirements on the performance of filters. Miniaturized, high-performance, and wide-band filters are an indispensable part of communication systems. A balanced filter requires that the signal be transmitted under the excitation of the differential mode signal and suppress the transmission of the common mode signal as much as possible. The internal noise and environmental noise of the system are mostly common-mode signals, so compared with ordinary single-ended filters, balanced filters have greater advantages in noise suppression. [0003] The traditional balanced filter is composed of a single-port filter and two balun structures, which not only makes the size of the filter large, but a...

Claims

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Application Information

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IPC IPC(8): H01P1/203
Inventor 邓宏伟赵永久贺莹王洪李
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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