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Balance type band-pass filter with harmonic suppression function

A band-pass filter and harmonic suppression technology, applied in the field of radio frequency communication, can solve the problem of lack of balanced band-pass filter

Active Publication Date: 2017-05-17
TIANJIN RES INST FOR ADVANCED EQUIP TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] That is to say, there is in the prior art: the technical problem of lacking a balanced band-pass filter with harmonic suppression function that is simple in structure and convenient for design and production

Method used

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  • Balance type band-pass filter with harmonic suppression function
  • Balance type band-pass filter with harmonic suppression function
  • Balance type band-pass filter with harmonic suppression function

Examples

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Embodiment 1

[0032] Please refer to figure 1 and figure 2 , an embodiment of the present invention provides a balanced bandpass filter with a harmonic suppression function, including: a port layer 10, a resonator layer 20, a ground layer 30, a first dielectric substrate 40, a second dielectric substrate 50 and a prepreg layer 60; it should be noted that, figure 2 The hierarchy shown is the same as figure 1 The planar structure of the balanced bandpass filter shown in the figure is consistent in size in the horizontal direction, and the devices of each layer in the two figures correspond to each other in the vertical direction.

[0033] The port layer 10 is arranged on the upper surface of the first dielectric substrate 40; the resonator layer 20 is arranged on the lower surface of the first dielectric substrate 40; the ground layer 30 is arranged on the lower surface of the second dielectric substrate 50; the first dielectric substrate 40 and the second dielectric substrate layer 50 i...

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Abstract

The invention discloses a balance type band-pass filter with a harmonic suppression function, and solves the technical problem that the balance type band-pass filter with the harmonic suppression function, a simple structure and convenience in design and production is not available in the prior art. The filter comprises a port layer, a resonator layer and a ground layer, wherein the port layer comprises a first differential port and a second differential port; the resonator layer comprises a first resonator and a second resonator; the first resonator and the second resonator are both half-wavelength open-loop resonators; a differential feed port is formed in a voltage zero point of a resonator secondary harmonic and is in orthogonal coupling with the corresponding resonator to excite the resonator fundamental wave to form a passband, and to suppress secondary harmonic at the same time; and the open loop side of the first resonator and the open loop side of the second resonator are arranged at intervals so as to realize coupling between the resonators and to form a resonator third harmonic band-elimination structure. A stop band on a differential mode is expanded while broadband common-mode rejection is realized by the filter; and in addition, the design steps are quite simple and the performance is good.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication, in particular to a balanced band-pass filter with harmonic suppression function. Background technique [0002] With the rapid development of radio frequency communication systems, balanced circuits have been widely used due to their strong anti-electromagnetic interference capability, good common-mode rejection, and easy connection with other balanced circuits. As the most critical signal selection device, the balanced bandpass filter requires good performance in its design, that is, it can better suppress harmonics while having the differential mode response required by the design. [0003] In the past few years, various balanced bandpass filters have been proposed and designed. Among them, a half-wavelength resonator is one of the simplest ways to realize a balanced bandpass filter. However, due to the periodic resonance characteristics of the transmission line resonator...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/203
CPCH01P1/203
Inventor 陈建新李蕴力陈蒋婧娴张士兵包志华
Owner TIANJIN RES INST FOR ADVANCED EQUIP TSINGHUA UNIV
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