High-selectivity differential dual-passband microstrip filter based on stepped impedance resonator

A technology of microstrip filter and ladder impedance, which is applied in the field of microwave and radio frequency, and can solve the problem of poor selectivity outside the differential mode passband

Active Publication Date: 2021-05-07
XIAN INSTITUE OF SPACE RADIO TECH +1
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Problems solved by technology

However, the disadvantage of this invention is that there is only one transmission zero between the two differential m

Method used

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  • High-selectivity differential dual-passband microstrip filter based on stepped impedance resonator
  • High-selectivity differential dual-passband microstrip filter based on stepped impedance resonator
  • High-selectivity differential dual-passband microstrip filter based on stepped impedance resonator

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] refer to figure 1 , the present invention includes a dielectric substrate 1, and the dielectric substrate 1 is made of RO5880 material with a relative permittivity of 2.2, a size of 46.2mm×40.0mm, and a thickness of 0.8mm.

[0019] The structure of the upper surface of the dielectric substrate 1 is as follows figure 2 As shown, the upper surface of the dielectric substrate 1 is printed with two U-shaped microstrip lines 4 that are mirror-symmetrical about the axis AA' and have opposite openings. The U-shaped microstrip lines 4 are formed by a The crossed microstrip bottom and two microstrip arms parallel to the axis BB' are used to realize the feeding characteristics. The microstrip bottom of the U-shaped microstrip line 4 and the two microstrip arms have the same width, both of which are 50Ω Impedance line width to ensure t...

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Abstract

The invention provides a high-selectivity differential dual-passband microstrip filter based on a stepped impedance resonator, and aims to improve out-of-band selectivity between differential mode passbands by increasing the number of transmission zero points. The high-selectivity differential dual-passband microstrip filter comprises a dielectric substrate, and a metal floor is printed on the lower surface of the dielectric substrate. Two stepped impedance slot lines which are in mirror symmetry about an axis A-A'are etched on the metal floor; the upper surface of the dielectric substrate is printed with two U-shaped microstrip lines which are in mirror symmetry about the axis A-A'and have opposite openings; two stepped impedance resonators and two stepped impedance microstrip lines which are in mirror symmetry about the axis A-A'are printed between the two U-shaped microstrip lines; and the stepped impedance resonator is an open ring structure, an opening faces an axis B-B', each stepped impedance microstrip line comprises a linear stepped impedance microstrip line and an L-shaped microstrip line, and the linear stepped impedance microstrip line is connected with the free end of one arm of the L-shaped microstrip line to form a quasi-U-shaped structure with the opening facing the axis B-B'.

Description

technical field [0001] The invention belongs to the field of microwave and radio frequency technology, and relates to a differential double-passband microstrip filter, in particular to a highly selective differential double-passband microstrip filter based on a ladder impedance resonator, which can be applied to wireless communication systems RF front end. Background technique [0002] In recent years, with the continuous advancement of various wireless communication technologies, filters, as an important device in modern wireless communication systems, play the role of accurately selecting signals in the working frequency band and filtering out system noise and other channel interference outside the working frequency band. important role. The microstrip structure has the advantages of high integration and miniaturization, and is widely used in filter design. However, the miniaturization leads to the reduction of the internal line spacing of the device, resulting in radiat...

Claims

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Application Information

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IPC IPC(8): H01P1/203
CPCH01P1/203
Inventor 李奇威孙静方进勇魏峰王嘉欣程星钰
Owner XIAN INSTITUE OF SPACE RADIO TECH
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