CN212113971U - Filter and antenna of half-wavelength resonator based on strip line structure - Google Patents
Filter and antenna of half-wavelength resonator based on strip line structure Download PDFInfo
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- CN212113971U CN212113971U CN202021047205.2U CN202021047205U CN212113971U CN 212113971 U CN212113971 U CN 212113971U CN 202021047205 U CN202021047205 U CN 202021047205U CN 212113971 U CN212113971 U CN 212113971U
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Abstract
The embodiment of the utility model discloses half wavelength resonator's wave filter and antenna based on stripline structure belongs to communication technology field. The filter includes: the half-wavelength resonator and the multilayer PCB medium plate are mounted on the surface; the half-wavelength resonator is positioned on the PCB medium plate of the middle layer; the center position of the half-wavelength resonator is virtually grounded, and the half-wavelength resonator adopts a hairpin line structure and a comb line structure which are alternately arranged. The embodiment of the utility model provides an in adopt the low loss tangent PCB dielectric plate to realize the wave filter, reduce development cost. The center position of the half-wavelength resonator in the filter is virtually grounded, so that the grounding of the resonator is avoided, and the problem that the grounding is difficult to accurately control the size in circuit processing is avoided. Half-wavelength syntonizer in the wave filter adopts hairpin line structure and combline structure, realizes miniaturized wave filter through the syntonizer that adopts stripline structure, and hairpin line structure and combline structure alternate arrangement realize half-wavelength coupling.
Description
Technical Field
The embodiment of the utility model provides a relate to the communication technology field, in particular to half wavelength syntonizer's wave filter and antenna based on stripline structure.
Background
5G (5) by phased array technologythGeneration, fifth Generation mobile communication system) millimeter wave communication technology is the most hot field of communication technology research at present, and the frequency band of 5G millimeter waves is released in China, America, Europe and other areas, and 24Hz/28Hz/39GHz is taken as the commercial frequency band of the future 5G millimeter waves. The phased array technology needs to integrate a large number of filters in an antenna for resisting interference, so that the development of a miniaturized filter applied to a millimeter wave frequency band is the key of the 5G millimeter wave technology. The conventional metal filter cannot be integrated inside the antenna due to its large volume and weight.
Many researches are carried out on miniaturized filters at home and abroad, and at present, the miniaturized filters are mainly realized by adopting an LTCC (Low Temperature Co-fired Ceramic) technology, an MEMS (Micro-Electro-Mechanical System) technology and the like.
However, when the LTCC technology and the MEMS technology are used to realize a miniaturized filter, a large amount of capital and cycle investment is required in the early development, thereby limiting the development work of the filter.
Disclosure of Invention
The embodiment of the utility model provides a half wavelength syntonizer's wave filter and antenna based on stripline structure for solve the problem among the prior art. The technical scheme is as follows:
in one aspect, there is provided a filter of half-wavelength resonators based on a stripline structure, the filter comprising: the half-wavelength resonator and the multilayer printed circuit board PCB dielectric plate are mounted on the surface;
the half-wavelength resonator is positioned on the PCB medium plate of the middle layer;
the center position of the half-wavelength resonator is virtually grounded, and the half-wavelength resonator adopts a hairpin line structure and a comb line structure which are alternately arranged.
In one possible embodiment, the first half-wavelength resonator in the filter adopts a comb-shaped line structure, and the second half-wavelength resonator adopts a hairpin line structure;
the first side length in the hairpin line structure is larger than the second side length, the first side length is the side length close to the first half-wavelength resonator, and the second side length is the side length far away from the first half-wavelength resonator.
In a possible implementation manner, the PCB dielectric slab on the uppermost layer and the PCB dielectric slab on the lowermost layer in the filter are ground layers, and through holes are formed around the half-wavelength resonator and connect the PCB dielectric slab on the uppermost layer and the PCB dielectric slab on the lowermost layer.
In a possible implementation mode, the distance between two rows of through holes in the filter and the distance between two rows of through holes in the filter are in a negative correlation relationship with the distance of a parasitic passband, and the two rows of through holes are through holes at the opening and the bending position of the half-wavelength resonator adopting the hairpin line structure.
In a possible implementation mode, the opening of the half-wavelength resonator adopting the hairpin line structure is provided with a chamfer angle.
In a possible embodiment, the filter further includes a pad, and the pad is located on the lowest PCB dielectric board.
In a possible embodiment, the filter further comprises a tap, the tap is connected to the first half-wavelength resonator in the filter, and the tap is connected to the pad through the via.
In one possible embodiment, the tapping is performed using a back drilling process.
In one possible embodiment, the first half-wavelength resonator is a half-wavelength resonator at the input end or a half-wavelength resonator at the output end.
In one aspect, an antenna is provided, in which a filter as described above is integrated.
The embodiment of the utility model provides a technical scheme's beneficial effect includes at least:
the filter comprises a half-wavelength resonator and a plurality of layers of PCB dielectric plates mounted in a surface-mounted mode, wherein the half-wavelength resonator is located on the PCB dielectric plate in the middle layer, and therefore the filter can be achieved through the PCB dielectric plates with low loss tangent, and development cost is reduced. The center position of the half-wavelength resonator in the filter is virtually grounded, so that the grounding of the resonator can be avoided, and the problem that the grounding is difficult to accurately control the size in circuit processing is avoided. Half-wavelength syntonizer in the wave filter adopts hairpin line structure and pectination line structure, like this, can realize miniaturized wave filter through the syntonizer that adopts stripline structure, and hairpin line structure and pectination line structure alternate arrangement to realize half-wavelength coupling.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a filter based on a half-wavelength resonator in an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of an intermediate layer of a filter according to an embodiment of the present invention;
fig. 3 is an enlarged schematic view of a half-wavelength resonator in an embodiment of the present invention;
fig. 4 is a frequency response graph of a filter in an embodiment of the invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, a filter of a half-wavelength resonator based on a stripline structure according to an embodiment of the present invention is shown, the filter including: a half-wavelength resonator 110 and a surface-mounted multi-layer PCB (Printed Circuit Board) dielectric Board 120, and the half-wavelength resonator 110 is positioned on the PCB dielectric Board 120 of the middle layer.
In order to reduce the development cost, in this embodiment, a low-cost PCB technology is adopted, and the millimeter wave filter is implemented by using the PCB dielectric plate 120 with a low loss tangent, so as to develop a filter suitable for the requirements of the phased array system in the frequency band of 5G millimeter waves. The filter may include a plurality of layers of PCB dielectric boards 120, and the plurality of layers of PCB dielectric boards 120 are mounted in a surface-mount manner, which is not limited in the embodiment.
In a possible example, the filter includes four layers of PCB dielectric boards 120, the uppermost layer of PCB dielectric board 120 and the lowermost layer of PCB dielectric board 120 may be ground layers, one layer of PCB dielectric board 120 located in the middle layer is provided with the half-wavelength resonator 110, and the other layer of PCB dielectric board 120 located in the middle layer is hollowed out.
The half-wavelength resonator 110 is a resonator of a strip line structure using a half wavelength, and can realize a miniaturized millimeter wave filter. Referring to the cross-sectional view of the middle layer of the filter shown in fig. 2, the shaded portion in fig. 2 is the copper-clad portion of the circuit, i.e., the half-wavelength resonator 110.
In this embodiment, the center of the half-wavelength resonator 110 is virtually grounded, please refer to the enlarged schematic diagram of the half-wavelength resonator 110 shown in fig. 3. Therefore, the grounding of the resonator can be avoided, and the problem that the grounding is difficult to accurately control the size in circuit processing is avoided.
The half-wavelength resonators 110 in this embodiment are all stripline structures, wherein the stripline structures include a hairpin line structure and a comb line structure. The hairpin line structure can be a U-shaped structure, and the comb line structure can be a long strip-shaped structure. In order to implement the half-wavelength coupling, the half-wavelength resonator 110 adopts a hairpin line structure and a comb line structure which are alternately arranged, so that the electromagnetic coupling can be implemented according to the distribution principle of the electric field and the magnetic field.
The alternate arrangement of the hairpin line structures and the comb line structures means that one hairpin line structure is arranged between every two comb line structures. For example, four hairpin line structures are arranged at intervals between five comb line structures in fig. 1.
The filter further comprises an input terminal and an output terminal, and in this embodiment, the half-wavelength resonator 110 at the input terminal and the half-wavelength resonator 110 at the output terminal are both referred to as a first half-wavelength resonator 110. Taking fig. 1 as an example, the leftmost half-wavelength resonator 110 and the rightmost half-wavelength resonator 110 in fig. 1 are both referred to as the first half-wavelength resonator 110.
In this embodiment, the first half-wavelength resonator 110 in the filter adopts a comb-shaped line structure, and the second half-wavelength resonator 110 adopts a hairpin line structure. Since the coupling gap 130 between the first half-wavelength resonator 110 and the second half-wavelength resonator 110 is where the coupling is the strongest in the filter, the coupling gap 130 is small, and in order to enhance the coupling, the second half-wavelength resonator 110 may be designed in an asymmetric structure to increase the length of one side near the first half-wavelength resonator 110, thereby enhancing the coupling coefficient with the first half-wavelength resonator 110. That is, the first side length 111 in the hairpin line structure is larger than the second side length 112, the first side length 111 is a side length close to the first half-wavelength resonator 110, and the second side length 112 is a side length far from the first half-wavelength resonator 110.
In one embodiment, the uppermost PCB dielectric board 120 and the lowermost PCB dielectric board 120 in the filter are ground layers, and the half-wavelength resonator 110 is provided with through holes 140 at its periphery, and the through holes 140 connect the uppermost PCB dielectric board 120 and the lowermost PCB dielectric board 120. Thus, by arranging the through holes 140 around the filter, the electromagnetic signal can be shielded by the through holes 140, and the leakage of the electromagnetic signal is reduced, so that the loss of the filter is reduced.
In this embodiment, the through holes located at the opening and the bend of the half-wavelength resonator 110 in the hairpin line structure may be referred to as two upper and lower rows of through holes 140. The distance between the two rows of vias 140 in the filter is inversely related to the distance of the parasitic passband. That is, the larger the distance between the two rows of vias 140, the closer the parasitic passband; the smaller the distance between the upper and lower rows of vias 140, the further the parasitic pass-band.
In order to reduce the surface waves on the PCB dielectric board 120 to suppress the parasitic passband, it is necessary to reduce the distance between the two rows of vias 140 as much as possible. In one embodiment, the opening of the half-wavelength resonator 110 in the hairpin structure is chamfered so that the vias 140 in the upper row can be moved down at the chamfered angle to reduce the distance between the two rows of vias 140.
In this embodiment, the filter further includes a pad (not shown in fig. 1) located on the lowest PCB dielectric board 120. Wherein the pads are for connection to a phased array system.
In this embodiment, the filter further comprises a tap 150, the tap 150 being connected to the first half-wavelength resonator 110 in the filter, and the tap 150 being connected to the pad through the via 140. Wherein, the filter comprises two taps 150, wherein one tap 150 is connected with the first half-wavelength resonator 110 of the input end, and the other tap 150 is connected with the first half-wavelength resonator 110 of the output end.
The taps 150 in the filter may be implemented using a back-drilling process to avoid the risk of a short circuit that may occur.
The filter in this embodiment is suitable for 5G communication system with 24Hz/28Hz/39GHz, please refer to the frequency response graph of the filter shown in FIG. 4.
In summary, in the filter provided by this embodiment, the filter includes the half-wavelength resonator and the multilayer PCB dielectric plate mounted on the surface mount, and the half-wavelength resonator is located on the PCB dielectric plate in the middle layer, so that the filter can be implemented by using the PCB dielectric plate with a low loss tangent, thereby reducing the development cost. The center position of the half-wavelength resonator in the filter is virtually grounded, so that the grounding of the resonator can be avoided, and the problem that the grounding is difficult to accurately control the size in circuit processing is avoided. Half-wavelength syntonizer in the wave filter adopts hairpin line structure and pectination line structure, like this, can realize miniaturized wave filter through the syntonizer that adopts stripline structure, and hairpin line structure and pectination line structure alternate arrangement to realize half-wavelength coupling.
An embodiment of the utility model provides an antenna still provides, based on phased array technique, this antenna internal integration has a plurality of wave filters in the above.
The above description should not be taken as limiting the embodiments of the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the embodiments of the present invention should be included in the scope of the embodiments of the present invention.
Claims (10)
1. A filter based on half-wavelength resonators in a stripline structure, the filter comprising: the half-wavelength resonator and the multilayer printed circuit board PCB dielectric plate are mounted on the surface;
the half-wavelength resonator is positioned on the PCB medium plate of the middle layer;
the center position of the half-wavelength resonator is virtually grounded, and the half-wavelength resonator adopts a hairpin line structure and a comb line structure which are alternately arranged.
2. The filter of claim 1, wherein the first half-wavelength resonator of the filter is in a comb structure and the second half-wavelength resonator is in a hairpin structure;
the first side length in the hairpin line structure is larger than the second side length, the first side length is the side length close to the first half-wavelength resonator, and the second side length is the side length far away from the first half-wavelength resonator.
3. The filter of claim 1, wherein the uppermost PCB dielectric plate and the lowermost PCB dielectric plate in the filter are ground planes, and through holes are formed around the half-wavelength resonator, and the through holes connect the uppermost PCB dielectric plate and the lowermost PCB dielectric plate.
4. The filter of claim 3, wherein the distance between the two upper and lower rows of vias in the filter is inversely related to the distance of the parasitic passband, and the two upper and lower rows of vias are vias located at the opening and the bend of the half-wavelength resonator in the hairpin structure.
5. The filter of claim 4, wherein the opening of the half-wavelength resonator using the hairpin line structure is provided with a chamfer.
6. The filter of claim 3, further comprising a pad on a lowest layer of PCB dielectric board.
7. The filter of claim 6, further comprising a tap connected to a first one-half wavelength resonator in the filter, the tap connected to the pad through the via.
8. The filter of claim 7, wherein the taps are implemented using a back-drilling process.
9. A filter according to claim 2 or 7, characterised in that the first half-wavelength resonator is a half-wavelength resonator at the input or a half-wavelength resonator at the output.
10. An antenna having integrated therein a filter according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021047205.2U CN212113971U (en) | 2020-06-09 | 2020-06-09 | Filter and antenna of half-wavelength resonator based on strip line structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021047205.2U CN212113971U (en) | 2020-06-09 | 2020-06-09 | Filter and antenna of half-wavelength resonator based on strip line structure |
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| CN212113971U true CN212113971U (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021047205.2U Expired - Fee Related CN212113971U (en) | 2020-06-09 | 2020-06-09 | Filter and antenna of half-wavelength resonator based on strip line structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111668581A (en) * | 2020-06-09 | 2020-09-15 | 江苏贝孚德通讯科技股份有限公司 | Filter and antenna of half-wavelength resonator based on strip line structure |
| CN113497326A (en) * | 2021-06-30 | 2021-10-12 | 华为技术有限公司 | Coupler and electronic equipment |
-
2020
- 2020-06-09 CN CN202021047205.2U patent/CN212113971U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111668581A (en) * | 2020-06-09 | 2020-09-15 | 江苏贝孚德通讯科技股份有限公司 | Filter and antenna of half-wavelength resonator based on strip line structure |
| CN113497326A (en) * | 2021-06-30 | 2021-10-12 | 华为技术有限公司 | Coupler and electronic equipment |
| CN113497326B (en) * | 2021-06-30 | 2022-06-10 | 华为技术有限公司 | Coupler, radio frequency circuit board, radio frequency amplifier and electronic equipment |
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Granted publication date: 20201208 |