CN217770041U - Elliptic function high-pass filter - Google Patents
Elliptic function high-pass filter Download PDFInfo
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- CN217770041U CN217770041U CN202221995444.XU CN202221995444U CN217770041U CN 217770041 U CN217770041 U CN 217770041U CN 202221995444 U CN202221995444 U CN 202221995444U CN 217770041 U CN217770041 U CN 217770041U
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Abstract
The utility model discloses an elliptic function high pass filter, including PCB printing board, be provided with the coupling capacitance of establishing ties and parallelly connected ladder impedance syntonizer on the PCB printing board, ladder impedance syntonizer includes the fan-shaped electric capacity of suspension stripline inductance and planar waveguide structure, and PCB printing board is installed between last cavity and lower cavity, goes up the cavity and still is connected with the radio frequency coaxial connector down between the cavity. The utility model discloses a product of elliptic function high pass filter design, very big assurance the rectangle coefficient of product, nearly area suppression has accomplished the optimum.
Description
Technical Field
The utility model relates to a high pass filter in wireless communication field especially relates to an elliptic function high pass filter, elliptic function type high pass filter can improve the outer restraine of near-band area.
Background
High-pass filters are an essential and important component in modern mobile communication technology. Common high-pass filters are two types, namely a Chebyshev type filter and an elliptic function type filter, and the common high-pass filters have the obvious defects of slow descending outside a near-band and low inhibition, and cannot meet the ultrahigh inhibition requirement of the near-band; the latter has the advantages of small volume, wide passband bandwidth, low in-band insertion loss, high near-band out-of-band inhibition and easy batch processing production. Therefore, the elliptic function type high-pass filter has good product performance and strong market competitiveness and is a preferred device of a base station of a mobile communication system for a long time.
With the development of mobile communication, the introduction of new standards and systems, the market has higher and higher requirements on the performance of the high-pass filter. Firstly, the product has higher requirement on the inhibition degree of a near band, and secondly, the high-pass filter has higher requirement on the passband bandwidth, which are the difficulties in the design of the elliptic function type high-pass filter.
The high-pass filter in the prior art mainly has the problems of slow out-of-band drop, low out-of-band rejection, large insertion loss, large standing wave ratio and other filtering effects, and part of the prior art also has the problems of difficult tuning or inconvenient operation, system isolation and the like.
After retrieval, no reference file that can solve the above problems has been found.
Disclosure of Invention
Technical problem to be solved
The utility model provides an elliptic function type high pass filter, this wave filter adopt suspension microstrip structure, obtain higher rectangle coefficient and wideer passband bandwidth.
(II) technical scheme
In order to solve the above problem, the utility model provides a following technical scheme:
the PCB printed board is provided with a coupling capacitor connected in series and a stepped impedance resonator connected in parallel, the stepped impedance resonator comprises a suspended stripline inductor and a fan-shaped capacitor of a planar waveguide structure, the PCB printed board is installed between an upper cavity and a lower cavity, and the end faces of the two ends of the upper cavity and the lower cavity are further connected with radio frequency coaxial connectors.
As the preferable scheme of the previous step, positioning pins are arranged between the PCB and the upper and lower cavities and used for accurately positioning the PCB between the upper and lower cavities.
As the preferable scheme of the previous step, the front surface of the upper cavity is provided with an upper cylindrical counter bore, the front surface of the lower cavity is provided with a first lower screw hole, and the upper cavity and the lower cavity are fixedly connected through locking screws screwed into the upper cylindrical counter bore and the first lower screw hole.
As a preferable scheme of the previous step, an upper screw hole is formed in the end face of the upper cavity body, a second lower screw hole is formed in the end face of the lower cavity body, a through hole or a connecting screw hole is formed in the connector, and the radio frequency coaxial connector is fixed to the end faces of the upper cavity body and the lower cavity body through pan head fastening screws.
As a preferable scheme of the previous step, the width of the high resistance line of the suspended stripline inductor is 0.4mm, and the included angle of the fan-shaped capacitor is 120 degrees.
(III) advantageous effects
The beneficial effects of the utility model reside in that:
(1) The utility model discloses a product of elliptic function high pass filter design, very big assurance the rectangle coefficient of product, nearly area suppression has accomplished the optimum.
(2) The utility model discloses a reduce the parasitic capacitance of thread series capacitance and reduce parasitic inductance and the electric capacity of parallelly connected ladder impedance syntonizer, the wave filter has obtained wideer passband frequency, can reach 10 octaves.
(3) The utility model discloses a compact structure's suspension band wire compares in the microstrip line, and the most power line of suspension band wire concentrates on in the air, and the influence is little in the medium introduction, and the suspension band wire has less electric field strength at the dielectric layer, has littleer current density at the metal level, so the suspension band wire Q value is higher, and the filter loss by its constitution is little.
(4) The utility model discloses this elliptic function type suspension microstrip high pass filter, overall mechanical structure is simple, and the spare part processing degree of difficulty is little, and the assembly uniformity is good, easily batch production, and overall cost is low.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a perspective view of the present invention;
fig. 3 is a three-dimensional structure diagram of the PCB printed board of the present invention;
wherein: 1. the antenna comprises an upper cavity, 11, an upper screw hole, 12, an upper cylindrical counter bore, 2, a lower cavity, 21, a first lower screw hole, 22, a second lower screw hole, 3, a PCB printed board, 31, a coupling capacitor, 32, a suspension stripline inductor, 33, a fan-shaped capacitor, 34, a positioning hole, 4, a radio frequency coaxial connector, 41, a through hole or a connecting screw hole, 5, a positioning pin, 6, a locking screw, 7 and a pan head fastening screw.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and the described embodiments are only some embodiments, not all embodiments, of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment is as follows:
the utility model discloses an ultra wide band high pass filter adopts elliptic function high pass filter prototype, and fig. 1 is corresponding circuit design schematic diagram, and the wave filter adopts suspension microstrip structure, and the wave filter body includes PCB printed board 3, and the upper and lower both sides of printed board are provided with cavity 1 and cavity 2 down respectively, and cavity and last cavity pass through fastening screw fixed connection down, the equal fixedly connected with connector 4 in the left and right sides of cavity, as shown in fig. 2, the utility model discloses a radio frequency coaxial connector 4 is a square flange coaxial connector, wherein is provided with four through-holes or connects screw 41 on four angles of connector, goes up cavity 1 terminal surface and is provided with screw 11, and the terminal surface of cavity 2 is provided with first lower screw 21 down, and radio frequency coaxial connector 4 fixes the terminal surface at last cavity 1 and cavity 2 down through coiled hair fastening screw 7, goes up the front of cavity 1 and is provided with cylindricality counter sink hole 11, and 2 inner wall openly is provided with second lower screw 22 down, goes up cavity 1 and cavity 2 down through last cylindricality counter sink hole 11 in the screw, and carries out fixed connection with locking 6 of PCB 3 lower cavity, and the last cavity 3 and the lower cavity 2 inner wall openly is provided with the main impedance of suspension and the parallel connection of PCB, and the parallel connection of the impedance of the PCB 3, and the main impedance of the series connection of the resonator 33 that the high pass through spiral inductance is shown by the series connection of PCB, and the series connection of the PCB, and the impedance of the PCB is connected with the PCB, and the series connection of the structure, and is again, and is connected with the series connection of the impedance of the PCB, and is connected with the impedance of the PCB, and is connected with the impedance of the structure.
An elliptic function high-pass filter prototype is adopted, a corresponding circuit design schematic diagram is shown in figure 1, and 8-section stepped impedance resonators are adopted in the design according to specific index requirements of customers.
Compared with a microstrip line, most of power lines of the suspension strip lines are concentrated in the air, the influence of medium introduction is small, the suspension strip lines have smaller electric field intensity in the medium layer, and smaller current density exists in the metal layer, so that the Q value of the suspension strip lines is higher, the loss of a filter formed by the suspension strip lines is small, the requirement on the coupling capacitance of the main circuit series capacitor is stronger, the double-layer suspension strip line structure is easier to realize, and the strip line widths of the upper layer and the lower layer of the main circuit PCB are both 2.16mm.
The PCB is a high-frequency board with the dielectric constant of 2.2 and good performance, the thickness of the high-frequency board is 0.254mm, the coupling distance is further reduced, the coupling area is reduced, the parasitic parameters between the plate capacitors are reduced, and the wider bandwidth is realized.
The central line of the suspension microstrip and the central lines of the radio frequency coaxial connectors at the two ends are on the same straight line, and the parallel branch stepped impedance resonator is connected with the upper side and the lower side of the central line of the suspension microstrip in a row.
The parallel branch stepped impedance resonator is composed of an inductor and a fan-shaped capacitor, the inductor part is in a suspended strip line structure, the capacitor part adopts a fan-shaped structure, and parasitic parameters generated by impedance sudden change are reduced by utilizing the characteristic of gradual impedance change of the capacitor part; and the sector capacitor part structure is changed from a suspended strip line structure into a planar waveguide structure, so that the sector area is reduced, the parasitic capacitance is reduced, and the wider passband bandwidth is ensured.
In this example, the width of the high resistance line equivalent to the inductor is 0.4mm, the included angle of the sector capacitor is uniform 120 degrees, and a non-uniform angle can be adopted according to optimization requirements.
In order to ensure the assembly precision, a positioning pin 5 is arranged between the PCB and the upper and lower cavities, the positioning pin 5 penetrates through a positioning hole 34 arranged on the PCB, and two ends of the positioning pin 5 are respectively connected with the inner walls of the upper and lower cavities.
In order to better satisfy the thermal conductivity and the corrosion resistance of filter cavity, as the utility model discloses an ultra wide band high pass filter cavity and last cavity all adopt the aluminum alloy material down, specifically are AL6061.
In order to better reduce the insertion loss of the filter, the surface treatment of the lower cavity and the upper cavity is silver plating, and the specific requirement is Cu3Ag1.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. An elliptic function high-pass filter, characterized by: the PCB comprises a PCB (printed circuit board) (3), wherein a coupling capacitor (31) and a parallel stepped impedance resonator which are connected in series are arranged on the PCB (3), the stepped impedance resonator comprises a suspended stripline inductor (32) and a fan-shaped capacitor (33) of a planar waveguide structure, the PCB (3) is installed between an upper cavity (1) and a lower cavity (2) and is fixed through screws, and the end faces of the two ends of the upper cavity (1) and the lower cavity (2) are further connected with a radio frequency coaxial connector (4).
2. An elliptic function high-pass filter as claimed in claim 1, characterized in that: a positioning pin (5) is arranged between the PCB printed board (3) and the upper cavity body and between the PCB printed board (3) and the lower cavity body, and the positioning pin (5) is used for accurately positioning the PCB printed board (3) between the upper cavity body and the lower cavity body.
3. An elliptic function high-pass filter according to claim 1 or 2, characterized in that: the front surface of the upper cavity (1) is provided with an upper cylindrical counter bore (12), the front surface of the lower cavity (2) is provided with a first lower screw hole (21), and the upper cavity (1) and the lower cavity (2) are fixedly connected through a locking screw (6) screwed into the upper cylindrical counter bore (12) and the first lower screw hole (21).
4. An elliptic function high-pass filter as claimed in claim 1, characterized in that: the end face of the upper cavity (1) is provided with an upper screw hole (11), the end face of the lower cavity (2) is provided with a second lower screw hole (22), a through hole or a connecting screw hole (41) is formed in the radio frequency coaxial connector, and the radio frequency coaxial connector (4) is fixed on the end faces of the upper cavity (1) and the lower cavity (2) through pan head fastening screws (7).
5. An elliptic function high-pass filter as claimed in claim 1, characterized in that: the width of a high-resistance wire of the suspended stripline inductor (32) is 0.4mm, and the included angle of the fan-shaped capacitor (33) is 120 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221995444.XU CN217770041U (en) | 2022-08-01 | 2022-08-01 | Elliptic function high-pass filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221995444.XU CN217770041U (en) | 2022-08-01 | 2022-08-01 | Elliptic function high-pass filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217770041U true CN217770041U (en) | 2022-11-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221995444.XU Active CN217770041U (en) | 2022-08-01 | 2022-08-01 | Elliptic function high-pass filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217770041U (en) |
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2022
- 2022-08-01 CN CN202221995444.XU patent/CN217770041U/en active Active
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