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dual band filter

A dual-band filter, dual-band technology, applied in waveguide-type devices, resonators, electrical components and other directions, can solve the problems of complex filter structure, difficult design, complex structure, etc., to achieve compact structure, flexible design, volume small effect

Inactive Publication Date: 2016-10-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are many ways to realize dual-band bandpass filters. The more common structures and their existing problems are as follows: (1) Two sets of single-band resonances are connected in parallel to realize dual-band filters. The existing problems are An additional matching circuit is often required, and the structure is complex and bulky; (2) A dual-band filter is designed by introducing a transmission zero in the passband of a wideband bandpass filter, but the filter has a complex structure and is difficult to design; (3) The traditional half-wavelength stepped impedance resonator is used for dual-band filter design, but the passbands of the dual-band filter affect each other, making the design difficult and bulky

Method used

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Embodiment Construction

[0014] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0015] Such as figure 1 As shown, the dual-band filter in this embodiment includes a dielectric substrate 1 provided with a grounding via 11, a main line 2 located on the upper surface of the dielectric substrate 1, and a metal floor 3 located on the lower surface of the dielectric substrate. The main line 2 is formed by cascading two axisymmetrically distributed dual-band resonators 21, 21', and the two dual-band resonators 21, 21' are connected through the ground via hole 11 to achieve grounding. The dual-band resonators 21, 21' are respectively connected with input / output transmission lines 4, ...

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Abstract

A dual-band filter applied to the communication field disclosed by the present invention includes a dielectric substrate provided with grounding through holes, a main circuit located on the upper surface of the dielectric substrate, and a metal floor located on the lower surface of the dielectric substrate, wherein the main circuit consists of two Axisymmetrically distributed dual-band resonators are cascaded. The two dual-band resonators are connected through ground vias. Each dual-band resonator is connected to the input / output transmission line. Each dual-band resonator includes a low Impedance transmission lines and L-shaped short-circuit high-impedance transmission lines and open-circuit transmission lines respectively connected to low-impedance transmission lines. The dual-band filter overcomes the problems of complex structure and bulky volume of traditional dual-band filters, and has the characteristics of center frequency, easy control of bandwidth, high frequency selectivity, good inter-band isolation, compact structure, and small size.

Description

technical field [0001] The invention belongs to the technical field of microwave communication, and in particular relates to a dual-band filter suitable for microwave and millimeter wave planar circuits. Background technique [0002] The rapid development of multi-band and multi-standard wireless communication systems puts forward higher design requirements for the frequency of multi-band bandpass filters. At present, there are many ways to realize dual-band bandpass filters. The more common structures and their existing problems are as follows: (1) Two sets of single-band resonances are connected in parallel to realize dual-band filters. The existing problems are An additional matching circuit is often required, and the structure is complex and bulky; (2) A dual-band filter is designed by introducing a transmission zero in the passband of a wideband bandpass filter, but the filter has a complex structure and is difficult to design; (3) The traditional half-wavelength stepp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/203H01P7/08
Inventor 尉旭波乐国韬袁双林廖家轩徐自强汪澎金龙田忠石玉
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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