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A Cavity Filter with Wide-Range Frequency Band Adjustability

A cavity filter, a large-scale technology, applied in the direction of waveguide devices, circuits, electrical components, etc., can solve the problem of non-adjustable frequency band, and achieve the effect of large return loss, large adjustable frequency band and good isolation effect

Active Publication Date: 2019-02-22
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the document "Novel Dual-Band Microwave Filter Using Dual-Capacitively-Loaded CavityResonator", a dual-frequency cavity filter is proposed, but its frequency band is not adjustable

Method used

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  • A Cavity Filter with Wide-Range Frequency Band Adjustability
  • A Cavity Filter with Wide-Range Frequency Band Adjustability
  • A Cavity Filter with Wide-Range Frequency Band Adjustability

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Embodiment Construction

[0033] 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 combination with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are exemplary only, and are not intended to limit the scope of the present invention. Also, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present invention.

[0034] Such as figure 1 As shown, the cavity filter with wide-range frequency band tunability in the preferred embodiment of the present invention includes a resonant cavity 13, a resonant cavity cover 14 and an inner conductor in the resonant cavity.

[0035] The resonant cavity 13 and the resonant cavity cover 14 are made of copper. In a specific embodiment of the present invention, the length of resonator 13, width, ...

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Abstract

The invention discloses a wide-range cavity filter with an adjustable frequency band. The wide-range cavity filter comprises an input port and an output port, wherein the input port and the output port are arranged on the same side of a cuboid resonant cavity, two rectangular windows are arranged at the central position of the resonant cavity, two cuboid resonant rods are arranged on two symmetric sides of the rectangular windows, two pairs of resonant discs are respectively arranged above the two cuboid resonant rods, two resonant discs arranged below the two cuboid resonant rods are separately connected with two cuboid resonant rods, and two cylindrical tuning screw rods are separately connected with the two resonant discs arranged above the two cuboid resonant rods. The corresponding area of the two pairs of resonant discs can be changed by rotating the tuning screw rods for achieving adjustable frequency band of the cavity filter. The wide-range cavity filter with the adjustable frequency band, disclosed by the invention, is simple in structure, relatively wide bandwidth, relatively small insertion loss and relatively high return loss can be achieved in pass-band width, the effect of adjustable frequency band in a wide range is achieved, and the cavity filter has favorable promotion prospect.

Description

technical field [0001] The invention relates to a cavity filter with adjustable frequency bands in a wide range, specifically, to a wireless communication system that needs filters in different frequency bands, and belongs to the technical field of microwave transmission devices. Background technique [0002] Filter is a frequency selective device, its function is to extract and separate useful signals, while suppressing unwanted signals, its performance affects the communication quality of the entire system. [0003] The filter is one of the indispensable key components in the communication transceiver. Its size determines the overall volume of the RF front-end to a certain extent. If a single filter can be used to achieve multi-frequency characteristics, the overall volume of the transceiver will be greatly reduced. Thereby effectively reducing the equipment cost. At present, the most widely used filters in radio frequency and microwave circuits are planar structure filte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01P1/207
CPCH01P1/207
Inventor 吴永乐南丽霞王卫民黎淑兰刘元安
Owner BEIJING UNIV OF POSTS & TELECOMM
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