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Narrowband high transmission filter

A filter and high-transparency technology, used in waveguide-type devices, electrical components, circuits, etc., to solve problems such as easy leakage, inability to achieve multi-frequency effects, and large lateral size of microstrip lines

Inactive Publication Date: 2010-05-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working mode of the microstrip line of the coupling ring is a quasi-TEM wave mode. If you want to obtain a relatively low frequency effect, you must use a large-sized metal ring resonant structure, which makes the lateral size of the microstrip line very large. , unfavorable coupling to the maintenance of the quasi-TEM wave mode, easy to leak, not conducive to device integration, and unable to achieve the ideal multi-frequency effect in a very narrow frequency band

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Please refer to the attached figure 1 .

[0019] The invention consists of a dielectric substrate 1, a metal layer ground plate 2, a metal ring 3, a metal microstrip 4, a 50-ohm matching line 5 and an adapter 6. A layer of metal layer grounding plate 2 is applied on the lower surface of the dielectric substrate 1. On the upper surface of the dielectric substrate 1, there are three coupling period units that are periodically arranged closely according to the design requirements but are disconnected from each other. Each coupling period The unit is connected by 5 square metal rings 3, and a metal microstrip 4 with the following specific design width is arranged between the 5 metal rings 3. Both ends of the filter of the present invention are connected to the adapter 6 (SMA head) through a 50-ohm matching line 5 . The dielectric substrate 1 has a relative permittivity of 2.6 and a thickness of 0.8mm. The average side length of the square metal ring 3 on the upper surfac...

Embodiment 2

[0021] All structures are the same as in Embodiment 1, except that there are 4 closely arranged but disconnected coupling period units, and each coupling period unit consists of 3 square metal rings 3 and the metal between two adjacent metal rings 3 The microstrip 4 is connected.

[0022] from Figure 4 (Coupling periodic unit composed of three metal rings connected together) It can be seen that below 5.5GHz, there are two resonant frequencies with high transmission, respectively at 2.64GHz and 5.25GHz, and the Q value is about 100-300. As the frequency increases, the Q value increases.

Embodiment 3

[0024] All structures are the same as in Embodiment 1, except that there are 3 closely arranged but mutually disconnected coupling period units, and each coupling period unit consists of 4 square metal rings 3 and the metal between two adjacent metal rings 3 The microstrip 4 is connected.

[0025] from Image 6 (Coupling period unit composed of four metal rings connected together) It can be seen that below 6GHz, there are three resonant frequencies with high transmission, respectively at 1.64GHz, 3.25GHz and 4.15GHz, and the Q value is about 100-300. As the frequency increases, the Q value increases.

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Abstract

Disclosed is a narrow band high pass filter. The filter comprises: metal layer plate (2), medium base plate (1) and three or more coupling cycle units on the top surface of the medium base plate (1),wherein each cycle unit is connected with three or more metal rings (3) and metal tape (4) connected with the metal rings (3). The metal rings (3) can be rectangle, square, circular and the distance and sizes of the metal rings (3) are same or different. The invention has the advantages of be able to realize high Q value frequency choice and have controlling the crossing size of micro strip line to realize low frequency.

Description

technical field [0001] The invention relates to a band-reject filter device which can be used in the field of microwave communication. It can have multiple operating frequencies, can effectively reduce the longitudinal size of the filter, and can reduce signal leakage, which is beneficial to device integration. . Background technique [0002] Microstrip is a commonly used waveguide device in the microwave band. It is mostly used for microwave signal transmission. It can also be used for bandpass or bandstop filtering, phase shifting, or delay lines through appropriate design. Microstrip is also commonly used in active devices such as antennas. . Microstrip lines have various structures, and when used for microwave propagation, they mainly rely on the quasi-TEM fundamental mode localized between the metal conduction band and the metal floor to transmit microwave signals. The microstrip line with the simplest structure is to lay a layer of metal on the lower base plate as th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/20
Inventor 李宏强文茂翠
Owner TONGJI UNIV