WO2018119825A1 - Tem mode filter and communication device - Google Patents

Abstract

Disclosed are a TEM mode filter and a communication device. The TEM mode filter comprises : a cover plate, a filter cavity and a resonator, wherein the cover plate covers the filter cavity, forming a resonant cavity, the resonator is arranged in the resonant cavity, at least part of the space of the resonant cavity is filled with a dielectric material, and the dielectric constant of the dielectric material is larger than the dielectric constant of air. By the above-mentioned means, the present invention provides a TEM mode filter and a communication device, which effectively reduce the volume and weight of the filter and also can realize a miniaturization design of the filter.

Description

TEM mode filter and communication device

[Technical Field]

The present invention relates to the field of communications technologies, and in particular, to a TEM mode filter and a communication device.

 【Background technique】

As a frequency selection device, mobile filters are widely used in the field of communications, especially in the field of radio frequency communications. In the base station, a filter is used to select a communication signal to filter out clutter or interference signals outside the frequency of the communication signal.

The resonators used in the conventional filter technology are made of metal, and the space between the resonator and the cavity is filled with air medium. In general, the use of metal resonators to achieve the required specifications of the radio frequency, the size of the cavity capacity will be relatively large, which is not conducive to the miniaturization of the filter.

 [Summary of the Invention]

The invention provides a TEM mode filter and a communication device, which can effectively reduce the volume of the cavity, thereby effectively reducing the volume and weight of the entire filter.

A technical solution adopted by the present invention is to provide a filter, comprising: a cover plate, a filter cavity and a resonator; wherein the cover plate covers the filter cavity to form a resonant cavity, and the resonator is disposed on Within the resonant cavity, the resonant cavity is at least partially filled with a dielectric material having a dielectric constant greater than a dielectric constant of air.

Wherein the resonator is a metal resonator, and the dielectric material is filled between the metal resonator and the filter cavity.

Wherein the dielectric material is a solid material.

The dielectric material is in contact with an outer peripheral surface of the metal resonator and is spaced apart from an inner peripheral surface of the filter cavity.

Wherein the resonator is a dielectric resonator formed of the dielectric material, and a conductive layer is coated on a surface of the dielectric resonator.

Wherein the resonator is hollow.

Wherein, the resonator is formed integrally or separately from the filter cavity.

Therein, a tuning screw is also included, the tuning screw being coupled to the cover plate and extending into the resonator to adjust the frequency of the resonator.

Wherein, the tuning screw and the resonator are disposed coaxially with each other.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a communication device including the above TEM mode filter, and the TEM mode filter is used for selecting a signal transmission and reception of the communication device.

The communication device is one of a simplexer, a duplexer, a splitter, a combiner, and a tower top amplifier.

The invention has the beneficial effects of providing a TEM mode filter and a communication device, which can be effectively filled by at least partially filling a dielectric material between a metal resonator and a filter cavity or by coating a conductive layer on a surface of the dielectric resonator. Reduce the volume of the cavity, which in turn reduces the size and weight of the entire filter.

 [Description of the Drawings]

1 is a schematic cross-sectional view of a TEM mode filter according to a first embodiment of the present invention;

2 is a schematic perspective cross-sectional view of a TEM mode filter in accordance with a second embodiment of the present invention.

【detailed description】

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the present invention, a dielectric material having a dielectric constant greater than that of air is at least partially filled between the metal resonator and the filter cavity. Also, in a preferred embodiment, a high dielectric constant solid dielectric material is added to the outside of the original metal resonator. In another preferred embodiment, the original metal resonator is replaced by a high dielectric constant dielectric resonator, and a conductive layer is coated on the surface of the dielectric resonator. In the above manner, the volume of the cavity can be effectively reduced, thereby reducing the volume and weight of the entire filter, that is, the purpose of miniaturization of the filter can be achieved. The following detailed description will be made in conjunction with specific embodiments as follows:

Please refer to FIG. 1. FIG. 1 is a schematic cross-sectional view of a TEM mode filter according to a first embodiment of the present invention. The TEM mode filter 10 includes a cover plate 11, a filter cavity 12, and a resonator 13. Further, the TEM mode filter 10 further includes a tuning screw 15.

The cover 11 covers the filter cavity 12 to form a resonant cavity 14 , and the resonator 13 is disposed in the resonant cavity 14 , and the resonant cavity 14 at least partially fills the dielectric material 16 .

Among them, the resonator 13 is a metal resonator and is hollow. Specifically, the resonator 13 is formed integrally or separately from the filter cavity 12, and the resonator 13 is integrally formed on the inner side of the bottom of the filter cavity 12, or the resonator 13 is an independently disposed component and is in the filter cavity. The body 12 is fixedly connected by a fixing element.

Further, a dielectric material 16 is filled between the metal resonator 13 and the filter cavity 12, and the dielectric material 16 is in contact with the outer peripheral surface of the metal resonator 13, and is spaced apart from the inner peripheral surface of the filter cavity 12. Specifically, the dielectric material 16 is a solid material including, but not limited to, ceramics such as barium titanate, zirconate, and zirconium titanate, and the dielectric constant of the dielectric material 16 is greater than the dielectric constant of air. In an application scenario of the present invention, the greater the dielectric constant of the dielectric material 16 to be filled, the smaller the volume of the dielectric material 16 is required, and the smaller the size and weight of the corresponding TEM mode filter 10.

In a particular embodiment, the tuning screw 15 is coupled to the cover plate 11 and extends into the resonator 13, and the frequency of the resonator 13 is adjusted by varying the length of the tuning screw 15. In the present application, the tuning screw 15 and the resonator 13 are disposed coaxially with each other.

In the above embodiment, by filling at least part of the space between the metal resonator and the filter cavity with a dielectric material having a dielectric constant larger than air, the volume of the cavity can be effectively reduced, thereby reducing the volume and weight of the entire filter.

Referring to FIG. 2, a second embodiment of the present invention is different from the first embodiment in that at least part of the space filling dielectric constant between the metal resonator and the filter cavity in the first embodiment is greater than air. The dielectric material of the second embodiment is replaced with a dielectric resonator having a high dielectric constant, and a conductive layer is coated on the surface of the dielectric resonator. The specific description is as follows:

Please refer to FIG. 2. FIG. 2 is a schematic perspective cross-sectional view of a TEM mode filter according to a second embodiment of the present invention. The TEM mode filter 20 includes a cover plate 21, a filter cavity 22, and a resonator 23. Further, the TEM mode filter 20 further includes a tuning screw 25.

The cover plate 21 covers the filter cavity 22 to form a resonant cavity 24, and the resonator 23 is disposed in the resonant cavity 24, and the resonant cavity 24 at least partially fills the dielectric material 26.

Among them, the resonator 23 is a dielectric resonator formed of a dielectric material and is hollow. Specifically, the dielectric material is a solid material including but not limited to ceramics such as barium titanate, zirconate, and zirconium titanate, and the dielectric constant of the dielectric material is greater than the dielectric constant of air. In a specific application scenario of the present invention, the larger the dielectric constant of the dielectric material, the smaller the volume of the resonator 23 is formed, and the smaller the volume of the corresponding TEM mode filter 20 is, which facilitates the implementation of the filter. Miniaturization.

The resonator 23 is formed integrally or separately from the filter cavity 22, and the resonator 23 is integrally formed on the inner side of the bottom of the filter cavity 22, or the resonator 23 is an independently disposed component and is in the filter cavity. 22 is fixedly connected by fixing elements.

Further, to reduce the insertion loss, the dielectric resonator 23 is coated with a conductive layer, such as a metal including but not limited to silver, on the upper surface 231 and the inner surface 232 as shown in FIG.

In a particular embodiment, the tuning screw 25 is coupled to the cover plate 21 and extends into the resonator 23 to adjust the frequency of the resonator 23 by varying the length of the tuning screw 25. In the present application, the tuning screw 25 and the resonator 23 are disposed coaxially with each other.

In the above embodiment, by replacing the original metal resonator with a high dielectric constant dielectric resonator and coating the conductive layer on the surface of the dielectric resonator, the volume and weight of the filter can be effectively reduced, and the filter can be reduced. Its insertion loss.

It can be understood that the filter provided by the above embodiments can be applied to a communication system, such as a communication device, which can be a simplex, a duplexer, a splitter, a combiner, and a tower amplifier. One kind. Specifically, the communication device can also be applied to a radar system, which is not specifically limited in the present invention. And the filter is used to select a signal to and from the communication device.

In summary, those skilled in the art will readily appreciate that the present invention provides a TEM mode filter and a communication device, which can effectively reduce the size and weight of the filter, and can also achieve the purpose of miniaturization of the filter.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims (11)

1.  A TEM mode filter, comprising: a cover plate, a filter cavity and a resonator;

   Wherein, the cover plate covers the filter cavity to form a resonant cavity, the resonator is disposed in the resonant cavity, and the resonant cavity is at least partially filled with a dielectric material, and the dielectric constant of the dielectric material is greater than air Dielectric constant.
2. The TEM mode filter according to claim 1, wherein said resonator is a metal resonator, and said dielectric material is filled between said metal resonator and said filter cavity.
3. The TEM mode filter according to claim 2, wherein the dielectric material is a solid material.
4. A TEM mode filter according to claim 3, wherein said dielectric material is in contact with an outer peripheral surface of said metal resonator and spaced apart from an inner peripheral surface of said filter cavity.
5. The TEM mode filter according to claim 1, wherein said resonator is a dielectric resonator formed of said dielectric material, and a conductive layer is coated on a surface of said dielectric resonator.
6. The TEM mode filter of claim 1 wherein said resonator is hollow.
7. The TEM mode filter according to claim 1, wherein said resonator is formed integrally or separately from said filter cavity.
8. The TEM mode filter of claim 1 further comprising a tuning screw coupled to said cover plate and extending into said resonator to adjust the frequency of the resonator.
9. The TEM mode filter according to claim 8, wherein said tuning screw and said resonator are disposed coaxially with each other.
10. A communication device comprising the TEM mode filter according to any one of claims 1 to 9, the TEM mode filter for selecting a signal transmission and reception of the communication device.
11. The communication device according to claim 10, wherein said communication device is one of a simplexer, a duplexer, a splitter, a combiner, and a tower top amplifier.