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Highly Selective Differential Dual-Passband Microstrip Filter Based on Ladder Impedance Resonators

A microstrip filter and stepped impedance technology, applied in the microwave and radio frequency fields, can solve the problem of poor out-of-band selectivity of differential mode passband, and achieve the effects of improving out-of-band selectivity, strong common mode rejection, and enhanced coupling

Active Publication Date: 2021-10-29
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 mode passbands, and less transmission zeros lead to poor out-of-band selectivity between the differential mode passbands

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  • Highly Selective Differential Dual-Passband Microstrip Filter Based on Ladder Impedance Resonators
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  • Highly Selective Differential Dual-Passband Microstrip Filter Based on Ladder Impedance Resonators

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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 present invention proposes a high-selectivity differential dual-passband microstrip filter based on a ladder impedance resonator, aiming to improve the out-of-band selectivity between the differential mode passbands by increasing the number of transmission zeros, including the dielectric substrate, the A metal floor is printed on the lower surface of the dielectric substrate, and two stepped impedance slit lines that are mirror-symmetrical about the axis A-A' are etched on the metal floor; two mirror-symmetrical and U-shaped microstrip lines with opposite openings; two stepped impedance resonators and two stepped impedance microstrip lines that are mirror-symmetrical about the axis A‑A' are printed between the two U-shaped microstrip lines; the stepped impedance resonators It adopts an open ring structure, and the opening faces the axis B‑B'; the stepped impedance microstrip line includes a linear stepped impedance microstrip line and an L-shaped microstrip line, and the linear stepped impedance microstrip line and the L-shaped microstrip line have one arm The free ends are connected 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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Patent Type & Authority Patents(China)
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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