CN203039076U - Quarter-wave coaxial resonator structure - Google Patents
Quarter-wave coaxial resonator structure Download PDFInfo
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- CN203039076U CN203039076U CN 201320003560 CN201320003560U CN203039076U CN 203039076 U CN203039076 U CN 203039076U CN 201320003560 CN201320003560 CN 201320003560 CN 201320003560 U CN201320003560 U CN 201320003560U CN 203039076 U CN203039076 U CN 203039076U
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- coaxial
- coaxial line
- quarter
- resonant cavity
- wave
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Abstract
The utility model relates to a quarter-wave coaxial resonator structure of a coaxial filter, so as to overcome the defect that the coaxial resonator in the prior art is huge in volume. The volume of the resonant cavity is narrowed by improving the coaxial line structure and shape in a resonant cavity. The technical scheme is that the quarter-wave coaxial resonator structure comprises a resonant cavity and a coaxial line, wherein the coaxial line is in a symmetrical structure, and the symmetric axis is coaxial with the central axis of the resonant cavity. The quarter-wave coaxial resonator structure is characterized in that a metal flat plate is connected onto the top part of the coaxial line; and the symmetric axis of the metal flat plate is coaxial with the symmetric axis of the coaxial line. According to the quarter-wave coaxial resonator structure, through improving the coaxial line structure, resonant capacitance is increased, the length of the coaxial line can be reduced, the volume of the resonant cavity and the volume of the coaxial filter can be reduced, and material and cost can be saved.
Description
Technical field
The utility model relates to coupling coaxial cavity filter, particularly constitutes the quarter-wave coaxial resonator structure of coupling coaxial cavity filter.
Background technology
Quarter-wave coaxial resonator (abbreviating resonator as) is the core component that constitutes coaxial filter, and its structure as depicted in figs. 1 and 2.Comprise resonant cavity 1 and coaxial line 10, resonant cavity 1 normally bottom surface is rectangle or foursquare four-prism, also can be cylinder.Coaxial line 10 has symmetrical structure, is generally cylinder, its symmetry axis and resonant cavity spigot shaft coaxle, coaxial line 10 length H=λ/4(λ are wavelength).Coaxial resonator can be regarded end open circuit, the coaxial line of a terminal shortcircuit as.Fig. 3 shows the structural representation of the level Four coaxial filter that is made of 4 coaxial resonators, and Fig. 4 is the equivalent circuit diagram of level Four coaxial filter.Each resonant cavity is realized parallel resonance by capacitor C o and inductance L o parallel circuits, and inner wire (coaxial line 10) is equivalent to inductance L o, and capacitor C o is the distributed capacitance between coaxial line and the resonant cavity, and capacitor C o and inductance L o are called resonant capacitance and resonant inductance.Capacitor C t is coupling capacitance, can regard the equivalent capacity of coupling window between the resonant cavity as.By the LC resonant circuit, a large amount of useless signal attenuation to ground, is transferred out useful signal by coupling capacitance Ct simultaneously, reach the purpose of filtering frequency-selecting.Because the coaxial line length by length is λ/4, lower when frequency, when wavelength is longer, the quarter-wave size of this moment is also bigger, situation as hundreds of million, cause coaxial resonator bulky like this, the volume of filter is doubled and redoubled especially, and product cost rises thereupon.
The utility model content
Technical problem to be solved in the utility model is exactly at the bulky shortcoming of prior art coaxial resonator, and a kind of quarter-wave coaxial resonator structure is provided, and by improving coaxial line planform in the resonant cavity, dwindles the resonant cavity volume.
The utility model solve the technical problem, the technical scheme that adopts is, quarter-wave coaxial resonator structure, comprise resonant cavity and coaxial line, described coaxial line has symmetrical structure, and its symmetry axis and resonant cavity spigot shaft coaxle is characterized in that, described coaxial line top is connected with metal plate, and the symmetry axis of described metal plate is coaxial with coaxial line symmetry axle.
Further, the periphery of the described oriented coaxial line root extension in metal plate edge.
Further, described periphery and metal plate are structure as a whole.
Concrete, the cross section of described resonant cavity is rectangle.
More specifically, described rectangle is long and wide equates.
The beneficial effects of the utility model are by improving the coaxial line structure, to increase resonant capacitance, thereby can reduce coaxial line length, and then reduce the volume of resonant cavity volume and coaxial filter, material saving and cost.
Description of drawings
Fig. 1 is prior art cavity resonator structure schematic diagram;
Fig. 2 is the A-A cutaway view of Fig. 1;
Fig. 3 is level Four coaxial filter structural representation;
Fig. 4 is level Four coaxial filter equivalent circuit diagram;
Fig. 5 is the structural representation of embodiment 1;
Fig. 6 is the A-A cutaway view of Fig. 5;
Fig. 7 is the structural representation of embodiment 2;
Fig. 8 is the A-A cutaway view of Fig. 7.
Embodiment
Describe the technical solution of the utility model in detail below in conjunction with drawings and Examples.
The technical solution of the utility model, improved the structure of coaxial line, at coaxial line open end (top) metal plate has been installed, the symmetry axis of this metal plate is coaxial with coaxial line symmetry axle, be equivalent to enlarge the area at coaxial line top, increased resonant capacitance.Because LC antiresonant circuit resonance frequency is determined by the product of resonant inductance and resonant capacitance, so satisfying under the condition of identical resonance frequency, can reduce resonant inductance, namely can reduce coaxial line length, thereby reduce resonant cavity volume and coaxial filter volume, not only can satisfy the requirement of product miniaturization, can also material saving and cost.
This routine quarter-wave coaxial resonator structure as shown in Figure 5 and Figure 6.The metal plate 11 that comprises resonant cavity 1 and coaxial line 10 and coaxial line 10 tops.This routine coaxial line section is circular, has symmetrical structure, its symmetry axis and resonant cavity 1 spigot shaft coaxle, and the section of resonant cavity 1 (namely cross section) vertical with central shaft is square.Metal plate 11 is circular among the figure, and its symmetry axis (or central shaft) is coaxial with the symmetry axis of coaxial line 10.This routine coaxial line planform increased coaxial line top and resonant cavity end face over against area, improved distributed capacitance.
Embodiment 2
This routine quarter-wave coaxial resonator structure is referring to Fig. 7 and Fig. 8.The periphery 12 that oriented coaxial line 10 roots in these routine metal plate 11 edges extend.With the periphery 12 of metal plate 11 integrative-structures, just as the metal bucket that tips upside down on the coaxial line top.The coaxial line structure of this shape, not only increased coaxial line and resonant cavity end face over against area, increased simultaneously with the resonant cavity sidewall over against area.This routine resonant capacitance recruitment is greater than embodiment 1.
Because coaxial cavity is equivalent to a LC antiresonant circuit, coaxial line is equivalent to inductance, and coaxial line length is more big, and inductance is more big.Coaxial line and resonant cavity form distributed capacitance, and coaxial line and resonant cavity are more big over against area, and distributed capacitance is more big.The coaxial line structure of above-described embodiment make the more much bigger than common coaxial cavity over against area of coaxial line and resonant cavity, so distributed capacitance is also much bigger.Because resonance frequency is determined by the product of inductance and electric capacity, so satisfying under the identical resonance frequency condition, can reduce inductance, also namely can reduce the length H of coaxial cavity inner wire.The coaxial line size just can little λ/4 like this, and the coaxial resonator of working it out so just can be smaller, and filter size also can correspondingly reduce.
Claims (5)
1. quarter-wave coaxial resonator structure, comprise resonant cavity and coaxial line, described coaxial line has symmetrical structure, its symmetry axis and resonant cavity spigot shaft coaxle, it is characterized in that, described coaxial line top is connected with a metal plate, and the symmetry axis of described metal plate is coaxial with coaxial line symmetry axle.
2. quarter-wave coaxial resonator structure according to claim 1 is characterized in that, the periphery that the oriented coaxial line root in described metal plate edge extends.
3. quarter-wave coaxial resonator structure according to claim 2 is characterized in that described periphery and metal plate are structure as a whole.
4. according to any described quarter-wave coaxial resonator structure of claim 1～3, it is characterized in that the cross section of described resonant cavity is rectangle.
5. quarter-wave coaxial resonator structure according to claim 4 is characterized in that, described rectangle is long and wide to be equated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320003560 CN203039076U (en) | 2013-01-06 | 2013-01-06 | Quarter-wave coaxial resonator structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320003560 CN203039076U (en) | 2013-01-06 | 2013-01-06 | Quarter-wave coaxial resonator structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203039076U true CN203039076U (en) | 2013-07-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320003560 Expired - Fee Related CN203039076U (en) | 2013-01-06 | 2013-01-06 | Quarter-wave coaxial resonator structure |
Country Status (1)
| Country | Link |
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| CN (1) | CN203039076U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019165A (en) * | 2020-08-27 | 2020-12-01 | 中电科仪器仪表有限公司 | Terahertz broadband frequency doubling circuit based on pump stray high suppression and frequency doubler |
-
2013
- 2013-01-06 CN CN 201320003560 patent/CN203039076U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112019165A (en) * | 2020-08-27 | 2020-12-01 | 中电科仪器仪表有限公司 | Terahertz broadband frequency doubling circuit based on pump stray high suppression and frequency doubler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130703 Termination date: 20140106 |