CN205680768U - Micro-strip open loop wave filter - Google Patents
Micro-strip open loop wave filter Download PDFInfo
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- CN205680768U CN205680768U CN201620648782.4U CN201620648782U CN205680768U CN 205680768 U CN205680768 U CN 205680768U CN 201620648782 U CN201620648782 U CN 201620648782U CN 205680768 U CN205680768 U CN 205680768U
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- strip
- open loop
- wave filter
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Abstract
The utility model discloses a kind of micro-strip open loop wave filter.This micro-strip open loop wave filter includes being located at the ground plane at the medium substrate back side and is located at that input, output and n of medium substrate front be square or the resonator of rectangle, n is integer and >=2, n resonator is open loop structure and size is identical with structure, n resonator is arranged in a line and is symmetric for symmetry axis with the perpendicular bisector of this straight line, the opening direction of adjacent resonators is contrary, is provided with the micro-strip branch line being connected with resonator in loop resonator.First, in ring, increase micro-strip branch line, external structure and the size of resonator will not be changed；Secondly, the micro-strip branch line increasing in ring is equivalent to add the length of resonator, significantly extends current path, reduces the resonant frequency of wave filter, the beneficially miniaturization of micro-strip open loop wave filter.
Description
Technical field
The utility model relates to a kind of micro-strip open loop wave filter.
Background technology
Generally using microstrip line system in microwave transmission field, its structure is as it is shown in figure 1, include the signals layer of top layer
101st, the ground plane 103 of the medium substrate 2 in intermediate layer and bottom.Ground plane 103 is usual to be made up of metal material, can be metal
Paper tinsel or metal coating, signals layer 103 is microstrip line.Existing microstrip filter uses open-loop resonator, and (resonator is i.e. gathered around
Have length-specific and the microstrip line of resonance can occur), resonator is connected in tap mode with input/output terminal, and its structure is such as
Shown in Fig. 2, Fig. 2 is a quadravalence micro-strip open loop wave filter, and input 3 is by tap mode and the resonator 1 near input 3
Connecting, output 4 is connected with the resonator 1 near output 4 by tap mode, and four resonators 1 are open loop structure, etc.
Effect is antiresonant circuit, forms bandpass filter by electromagnetic coupled, and it is corresponding that resonator 1 girth is about filter centre frequency
Wavelength (i.e. transmission wavelength in microstrip line for the signal) 1/2nd.Its operation principle is: when signal frequency is equal to center
During frequency, resonator parallel resonance, relatively big to ground impedance, useful signal can be transmitted by main road；When in signal frequency deviation
During frequency of heart, resonator not resonance, less to ground impedance, useless signal is to ground decay.But, above-mentioned micro-strip open loop wave filter
Volume relatively big, resonant frequency is higher, and the therefore application of micro-strip open loop wave filter is restricted.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of novel micro-strip open loop wave filter, its resonant frequency
Low, volume is little.
The technical scheme that the above-mentioned technical problem of the utility model solution is used is that micro-strip open loop wave filter, including be located at
The ground plane at the medium substrate back side and be located at that input, output and the n in medium substrate front be square or the resonator of rectangle,
N is integer and >=2, and n resonator is open loop structure and size is identical with structure, n resonator arrange in a line and with
The perpendicular bisector of this straight line is that symmetry axis is symmetric, and the opening direction of adjacent resonators is contrary, be provided with in loop resonator with
Resonator while connect micro-strip branch line.First, in ring increase micro-strip branch line, will not change resonator external structure and
Size；Secondly, the micro-strip branch line increasing in ring is equivalent to add the length of resonator, significantly extends current path, reduces humorous
Vibration frequency, the beneficially miniaturization of micro-strip open loop wave filter.Empirical tests, for same resonant frequency, resonance of the present utility model
The size of device is less than the volume of traditional resonator by about 80%.
Further, described resonator is provided with short dot, and short-circuit line connects ground plane and passes through medium substrate and resonator
On short dot connect.For the resonator being made up of the microstrip line of equal length, have that the resonator of short dot constitutes is micro-
With open loop wave filter, there is less resonant frequency.
Further, described short dot be positioned at opening place on.For traditional micro-strip open loop four-step filter
Speech, the girth of resonator is about 1/2nd of the corresponding wavelength of filter centre frequency.When increasing on the one side at opening place
If after short dot, the wavelength of corresponding resonator is about 1/4th of the corresponding wavelength of filter centre frequency.Therefore, right
In the wave filter of resonator and the identical exponent number of same girth, the resonant frequency of micro-strip open loop wave filter of the present utility model is about
The half of the resonant frequency of conventional filter.
Further, described micro-strip branch line has symmetrical structure.Use the micro-strip branch line of symmetrical structure, it is simple to make resonator
There is symmetrical structure, be conducive to regulating the resonant frequency of wave filter.Further, described micro-strip branch line in " I " type, " T-shaped ",
" do " type, " ten " type, " Y type " or " individual " type, naturally it is also possible to use the micro-strip branch line of other shapes.
Further, the width of described micro-strip branch line is equal with the width on the limit of described resonator, so can make resonator
On current density evenly.
Further, described micro-strip branch line with and opening relative connect, current path so can be made longer, resonance
The structure of device is more symmetrical, is conducive to reducing the resonant frequency of micro-strip open loop wave filter.Further, described micro-strip branch line and opening phase
To one side midpoint connect.
Further, the resonator near input is of coupled connections with input or tap is connected；Resonance near output
Device is of coupled connections with output or tap is connected.The external structure of the resonator of micro-strip open loop wave filter of the present utility model and biography
The external structure of the open-loop resonator of system is identical, therefore can replace the resonator in existing wave filter, with input/output terminal coupling
Close connection or tap connects.When employing is of coupled connections, passband both sides also can respectively produce an attenuation pole, thus improves
The Out-of-band rejection degree of wave filter.In order to realize being of coupled connections, input microstrip line and output microstrip line can be set up.Its
In, output is of coupled connections with the resonator near input by input microstrip line, input microstrip line and this resonator
One side parallel and vertical with described straight line；Output is coupled even with the resonator near output by output microstrip line
Connect, output microstrip line and the parallel of this resonator and vertical with described straight line；Input microstrip line and output are micro-
Structure with line is identical with shape, and is symmetrically distributed in the both sides of described symmetry axis.
Micro-strip open loop wave filter of the present utility model, on the basis of traditional resonator, increases micro-strip in the ring of resonator
Branch line so that current path significantly extends, can effectively reduce the resonant frequency of wave filter, contributes to the little of micro-strip open loop wave filter
Type.
Brief description
Fig. 1 is the structural representation of microstrip line system.
Fig. 2 is the structural representation of the quadravalence microstrip filter of prior art open loop structure.
Fig. 3 is the schematic diagram of the micro-strip open loop wave filter of embodiment 1.
Fig. 4 is the schematic diagram of the micro-strip open loop wave filter of embodiment 2.
Fig. 5 is the schematic diagram of the micro-strip open loop wave filter of embodiment 3.
Fig. 6 is the schematic diagram of the micro-strip open loop wave filter of embodiment 4.
Detailed description of the invention
Embodiment 1
It as it is shown on figure 3, micro-strip open loop wave filter is a four-step filter, including is located at the ground connection at medium substrate 2 back side
Face 103 and input the 3rd, input microstrip line the 5th, output the 4th, the output microstrip line 6 being located at medium substrate 2 front and four sides
Shape resonator 1, four resonators 1 are open loop structure and size is identical with structure, four resonators 1 arrange in a line and with
The perpendicular bisector of this straight line is that symmetry axis is symmetric, and the opening direction of adjacent resonators 1 is contrary.In the ring of each resonator 1,
Being connected with T-shape micro-strip branch line 11 on the relative midpoint, one side of opening, the width of micro-strip branch line 11 is equal to the width on each limit.?
The one side at opening place is provided with a short dot 12, and this short dot 12 is connected with ground plane 103 by short-circuit line.Empirical tests,
For same resonant frequency, the volume of the traditional resonator (not having micro-strip branch line and short dot) of the volume ratio of this resonator is little
About 80%.Output 3 is of coupled connections with the resonator 1 near input 3 by input microstrip line 5, input microstrip line 5
Parallel and vertical with described straight line with one side of the resonator 1 near input 3；Output 4 by output microstrip line 6 with
Resonator 1 near output 4 is of coupled connections, and output microstrip line 6 is parallel with the resonator 1 near output 4 simultaneously
And it is vertical with described straight line；Input microstrip line 5 is identical with shape with the structure of output microstrip line 6, and is symmetrically distributed in institute
State the both sides of symmetry axis.
During use, signal enters the resonator 1 near input 3 through input 3 by way of being of coupled connections, when defeated
When entering signal frequency equal to centre frequency, four resonator 1 parallel resonances, impedance is relatively big, and useful signal can pass through；Work as input
Signal frequency deviation centre frequency when, resonator 1 not resonance, impedance is less, useless signal to ground decay, signal eventually through
Output 4 exports.
Embodiment 2
As shown in Figure 4, compared with the micro-strip open loop wave filter of embodiment 1, differ primarily in that: the micro-strip of the present embodiment is opened
The micro-strip branch line 11 being connected in four resonators 1 of ring wave filter is " I " type.
Embodiment 3
As it is shown in figure 5, compared with the micro-strip open loop wave filter of embodiment 1, differ primarily in that: the micro-strip of the present embodiment is opened
Ring wave filter is third-order filter, and the micro-strip branch line 11 being connected in three resonators 1 is " doing " type.
Embodiment 4
As shown in Figure 6, compared with the micro-strip open loop wave filter of embodiment 1, differ primarily in that: the micro-strip of the present embodiment is opened
Ring wave filter is second order filter, and the micro-strip branch line 11 being connected in two resonators 1 is " ten " type.
Claims (9)
1. micro-strip open loop wave filter, including be located at the ground plane (103) at medium substrate (2) back side and be just located at medium substrate (2)
The input (3) in face, output (4) and n be square or the resonator (1) of rectangle, and n is integer and >=2, and n resonator (1) is all
Being open loop structure and size is identical with structure, n resonator (1) is arranged in a line and with the perpendicular bisector of this straight line as symmetry axis
Being symmetric, the opening direction of adjacent resonators (1) is contrary, it is characterised in that: it is provided with and resonance in the ring of resonator (1)
Device (1) while connect micro-strip branch line (11).
2. micro-strip open loop wave filter as claimed in claim 1, it is characterised in that: described resonator is provided with short dot (12),
Short-circuit line connects ground plane (103) and is connected with the short dot (12) on resonator (1) through medium substrate (2).
3. micro-strip open loop wave filter as claimed in claim 2, it is characterised in that: described short dot (12) is positioned at opening place
On one side.
4. micro-strip open loop wave filter as claimed in claim 1, it is characterised in that: described micro-strip branch line (11) has the knot of symmetry
Structure.
5. micro-strip open loop wave filter as claimed in claim 4, it is characterised in that: described micro-strip branch line (11) is in " I " type, " T
Type ", " doing " type, " ten " type, " Y type " or " individual " type.
6. micro-strip open loop wave filter as claimed in claim 1, it is characterised in that: the width of described micro-strip branch line (11) with described
The width on the limit of resonator (1) is equal.
7. micro-strip open loop wave filter as claimed in claim 1, it is characterised in that: described micro-strip branch line (11) is relative with opening
While connecting.
8. micro-strip open loop wave filter as claimed in claim 7, it is characterised in that: described micro-strip branch line (11) is relative with opening
The midpoint on one side connects.
9. micro-strip open loop wave filter as claimed in claim 1, it is characterised in that: near input (5) resonator (1) with defeated
Enter end (5) to be of coupled connections or tap connection；The resonator (1) of close output (6) is of coupled connections with output (6) or tap connects
Connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620648782.4U CN205680768U (en) | 2016-06-27 | 2016-06-27 | Micro-strip open loop wave filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620648782.4U CN205680768U (en) | 2016-06-27 | 2016-06-27 | Micro-strip open loop wave filter |
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| CN205680768U true CN205680768U (en) | 2016-11-09 |
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| CN201620648782.4U Expired - Fee Related CN205680768U (en) | 2016-06-27 | 2016-06-27 | Micro-strip open loop wave filter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684511A (en) * | 2016-12-28 | 2017-05-17 | 中国计量大学 | Adjustable terahertz wave filter based on tungsten sulfide film structure |
| CN107425240A (en) * | 2017-06-20 | 2017-12-01 | 成都旭思特科技有限公司 | A kind of wave filter with multiple loop configuration |
| CN107799857A (en) * | 2017-10-30 | 2018-03-13 | 成都大学 | A kind of compact-sized bimodule band-pass filter |
| CN108717994A (en) * | 2018-04-18 | 2018-10-30 | 西安电子科技大学 | A kind of novel planar double frequency band-pass filter antenna applied to WLAN frequency ranges |
| CN109167136A (en) * | 2018-08-23 | 2019-01-08 | 成都信息工程大学 | A kind of microstrip structure |
| WO2021093016A1 (en) * | 2019-11-12 | 2021-05-20 | 郴州世通科技有限公司 | Microstrip line filter |
-
2016
- 2016-06-27 CN CN201620648782.4U patent/CN205680768U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684511A (en) * | 2016-12-28 | 2017-05-17 | 中国计量大学 | Adjustable terahertz wave filter based on tungsten sulfide film structure |
| CN106684511B (en) * | 2016-12-28 | 2019-02-19 | 中国计量大学 | Based on the adjustable THz wave filter of tungsten sulfide membrane structure |
| CN107425240A (en) * | 2017-06-20 | 2017-12-01 | 成都旭思特科技有限公司 | A kind of wave filter with multiple loop configuration |
| CN107799857A (en) * | 2017-10-30 | 2018-03-13 | 成都大学 | A kind of compact-sized bimodule band-pass filter |
| CN108717994A (en) * | 2018-04-18 | 2018-10-30 | 西安电子科技大学 | A kind of novel planar double frequency band-pass filter antenna applied to WLAN frequency ranges |
| CN109167136A (en) * | 2018-08-23 | 2019-01-08 | 成都信息工程大学 | A kind of microstrip structure |
| CN109167136B (en) * | 2018-08-23 | 2021-04-06 | 成都信息工程大学 | Microstrip structure |
| WO2021093016A1 (en) * | 2019-11-12 | 2021-05-20 | 郴州世通科技有限公司 | Microstrip line filter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161109 Termination date: 20170627 |