CN109219904A - A kind of TEM mode filter and communication equipment - Google Patents
- ️Tue Jan 15 2019
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of communication, in particular to a TEM mode filter and communication equipment.
[ background of the invention ]
Mobile filters are widely used as a frequency selection device in the field of communications, especially in the field of radio frequency communications. In a base station, a filter is used to select a communication signal and 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 materials, and the space between each resonator and the cavity is filled with air media. In general, when a metal resonator is adopted to achieve the required radio frequency index, the size of the cavity capacity is relatively large, which is not beneficial to the miniaturization of the filter.
[ summary of the invention ]
The invention provides a TEM mode filter and communication equipment, which can effectively reduce the volume of a cavity, and further effectively reduce the volume and weight of the whole filter.
The invention adopts a technical scheme that: there is provided a filter comprising: the filter comprises a cover plate, a filter cavity and a resonator; the cover plate covers the filtering cavity to form a resonant cavity, the resonator is arranged in the resonant cavity, at least part of space of the resonant cavity is filled with a dielectric material, and the dielectric constant of the dielectric material is greater than that of air.
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 the outer peripheral surface of the metal resonator and is arranged at intervals with the inner peripheral surface of the filter cavity.
The resonator is a dielectric resonator formed by the dielectric material, and a conducting layer is coated on the surface of the dielectric resonator.
Wherein the resonator is hollow.
Wherein the resonator and the filter cavity are integrally or separately formed.
The tuning screw rod is connected with the cover plate and extends into the resonator to adjust the frequency of the resonator.
Wherein the tuning screw and the resonator are arranged coaxially with each other.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a communication device comprising the above TEM mode filter, the TEM mode filter being configured to select signal transmission and reception of the communication device.
The communication equipment is one of a simplex, a duplexer, a splitter, a combiner and a tower amplifier.
The invention has the beneficial effects that: a dielectric material is filled in at least part of the space between a metal resonator and a filter cavity or a conducting layer is coated on the surface of the dielectric resonator, so that the volume of the cavity can be effectively reduced, and the volume and the weight of the whole filter are further reduced.
[ description of the drawings ]
Fig. 1 is a schematic cross-sectional view of a TEM mode filter according to a first embodiment of the present invention;
fig. 2 is a schematic perspective cross-sectional view of a TEM mode filter according to a second embodiment of the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the invention, a dielectric material with a dielectric constant larger than that of air is filled in at least part of the space between the metal resonator and the filter cavity. In a preferred embodiment, a ring of solid dielectric material with high dielectric constant is added outside the original metal resonator. In another preferred embodiment, the original metal resonator is replaced by a dielectric resonator with high dielectric constant, and the surface of the dielectric resonator is coated with a conductive layer. Through the mode, the volume of the cavity can be effectively reduced, the volume and the weight of the whole filter are further reduced, and the purpose of miniaturization design of the filter can be achieved. The following detailed description will be made in conjunction with specific embodiments:
referring 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 plate 11 covers the filter cavity 12 to form a resonant cavity 14, the resonator 13 is disposed in the resonant cavity 14, and at least a part of the space of the resonant cavity 14 is filled with a dielectric material 16.
The resonator 13 is a metal resonator and is hollow. Specifically, the resonator 13 is formed integrally with or separately from the filter chamber 12, and the resonator 13 is formed integrally with the inner side surface of the bottom of the filter chamber 12, or the resonator 13 is an independently provided component and is fixedly connected to the filter chamber 12 by a fixing member.
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 tin titanate, and the dielectric constant of the dielectric material 16 is greater than that of air. In one aspect of the present invention, the larger 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 TEM mode filter 10.
In a particular embodiment, a 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 changing the length of the tuning screw 15. In the present application, the tuning screw 15 and the resonator 13 are arranged coaxially with each other.
In the above embodiment, the dielectric material with a dielectric constant greater than that of air is filled in at least part of the space between the metal resonator and the filter cavity, so that the volume of the cavity can be effectively reduced, and the volume and weight of the whole filter can be further reduced.
Referring to fig. 2, a second embodiment of the present invention is different from the first embodiment in that at least a part of the space between the metal resonator and the filter cavity in the first embodiment is filled with a dielectric material with a dielectric constant greater than that of air, the metal resonator in the second embodiment is replaced with a dielectric resonator with a high dielectric constant, and the surface of the dielectric resonator is coated with a conductive layer. The specific description is as follows:
referring 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, wherein 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.
Wherein, the cover plate 21 covers the filter cavity 22 to form a resonant cavity 24, the resonator 23 is disposed in the resonant cavity 24, and at least a part of the space of the resonant cavity 24 is filled with a dielectric material 26.
The resonator 23 is a dielectric resonator formed of a dielectric material and is hollow. Specifically, the dielectric material is a solid material including ceramics such as but not limited to barium titanate, zirconate, and zirconium tin titanate, and the dielectric constant of the dielectric material is greater than that of air. In a specific application scenario of the present invention, the larger the dielectric constant of the dielectric material is, the smaller the volume of the formed truncated resonator 23 is, and the smaller the volume of the corresponding TEM mode filter 20 is, which is beneficial to miniaturizing the filter.
The resonator 23 and the filter cavity 22 are integrally or separately formed, and the resonator 23 is integrally formed on the inner side surface of the bottom of the filter cavity 22, or the resonator 23 is an independently provided component and is fixedly connected to the filter cavity 22 by a fixing element.
Further, to reduce insertion loss, the upper surface 231 and the inner surface 232 of the dielectric resonator 23 as shown in fig. 2 are coated with a conductive layer, which is a metal including, but not limited to, silver.
In a particular embodiment, a tuning screw 25 is coupled to the cover plate 21 and extends into the resonator 23, and the frequency of the resonator 23 is adjusted by changing the length of the tuning screw 25. In the present application, the tuning screw 25 and the resonator 23 are arranged coaxially with each other.
In the above embodiment, the original metal resonator is replaced with the dielectric resonator with a high dielectric constant, and the conductive layer is coated on the surface of the dielectric resonator, so that not only the volume and weight of the filter can be effectively reduced, but also the insertion loss of the filter can be reduced.
It is understood that the filter provided in the above embodiments may be applied to a communication system, such as a communication device, which may be one of a duplexer, a splitter, a combiner, and a tower top amplifier. In particular, the communication device may also be applied to a radar system, and the present invention is not particularly limited. And the filter is used for selecting the signal transceiving of the communication equipment.
In summary, it is easily understood by those skilled in the art 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 achieve the purpose of miniaturization design of the filter.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.