CN207517832U - A kind of plane triplexer based on minor matters loading structure - Google Patents
A kind of plane triplexer based on minor matters loading structure Download PDFInfo
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- CN207517832U CN207517832U CN201721562818.8U CN201721562818U CN207517832U CN 207517832 U CN207517832 U CN 207517832U CN 201721562818 U CN201721562818 U CN 201721562818U CN 207517832 U CN207517832 U CN 207517832U
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- minor matters
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- pass filter
- filter
- branch line
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Abstract
The utility model discloses a kind of plane triplexers based on minor matters loading structure, including upper-layer micro-strip structure, intermediate medium substrate and underlying metal floor, the upper-layer micro-strip structure is by the first low-pass filter, second low-pass filter, bandpass filter, high-pass filter, first T-shaped branch line and the second T-shaped branch line are formed, the first T-shaped branch line and the second T-branch line include an input branch and two output branchs, first is connected and composed by the difference of above-mentioned wave filter and branch line, second and third filter network, first filter network and the second filter network shares the first low-pass filter, reduce the circuit complexity of the second low-pass filter and bandpass filter.
Description
Technical field
The utility model is related to a kind of plane triplexers, and in particular to one kind applied to RF front-end circuit is based on minor matters
The plane triplexer of loading structure.
Background technology
In the field of wireless communication, triplexer has very big demand.By accessing triplexer, communication system can be received
Originator shares common antenna, so as to be greatly reduced the volume of system.Triplexer should have smaller insertion loss, so as to carry
The signal-to-noise ratio that high antenna receives；There is very high isolation simultaneously, prevent the signal of transmitting terminal from coupling such as receiving terminal, burn out reception
Machine.In recent years, scholar expands triplexer many researchs at home and abroad.Most outstanding cavity triplexer has filter with low insertion loss,
The features such as high isolation, but cost is prohibitively expensive, and volume is larger, weight weight, limits the practical application of cavity triplexer.
Microstrip line triplexer has many advantages, such as low cost, light-weight, small.The debugging of microstrip line triplexer is also more prone to simultaneously,
Therefore microstrip line has the advantage of bigger in engineer application.
The characteristic of high isolation in order to obtain, forming the wave filter of triplexer needs introducing transmission zero as much as possible.It passes
Three passbands of triplexer are realized in system design usually using three wave filters, but there is the problem of inhibiting difference.
Utility model content
In order to overcome shortcoming and deficiency of the existing technology, the utility model provides a kind of based on minor matters loading structure
Plane triplexer.
The utility model, using shared low-pass filter, is realized good in the first two filter network in highest frequency range
Inhibition reduces minor matters quantity, reduces circuit complexity.
The utility model adopts the following technical solution：
A kind of plane triplexer based on minor matters loading structure, including upper-layer micro-strip structure, intermediate medium substrate and bottom
Metal floor, the upper-layer micro-strip structure is by the first low-pass filter, the second low-pass filter, bandpass filter, high-pass filtering
Device, the first T-shaped branch line and the second T-shaped branch line are formed, and the first T-shaped branch line and the second T-branch line include one
A input branch and two output branchs, specific connection are as follows：
The input branch input signal of first T-shaped branch line, by the output branch connection the of the first T-shaped branch line
The input terminal of one low-pass filter, the output terminal of the first low-pass filter are connect with the input branch of the second T-shaped branch line, then
One output branch of the second T-shaped branch line connects the input terminal of the second low-pass filter, and signal is defeated from the second low-pass filter
Outlet exports, and forms the first filter network；
The input branch input signal of first T-shaped branch line, by the output branch connection the of the first T-shaped branch line
The input terminal of one low-pass filter, then the output terminal of the first low-pass filter connect with the input branch of the second T-shaped branch line,
By the input terminal of another output branch connection bandpass filter of the second T-shaped branch line, finally from the output of bandpass filter
Output signal is held, forms the second filter network；
The input branch input signal of first T-shaped branch line is connected by another output branch of the first T-shaped branch line
The input terminal of high-pass filter from the output terminal output signal of high-pass filter, forms third filter network.
First low-pass filter, the second low-pass filter, bandpass filter and high-pass filter using open circuit or
Short circuit loads the minor matters for generating transmission zero.
First low-pass filter at least loads a minor matters, and is transmitted caused by the minor matters of the first low-pass filter
Zero frequency is located in the band connection frequency of third filter network.
Second low-pass filter at least loads a minor matters, transmission zero caused by the minor matters of the second low-pass filter
Dot frequency is located in the band connection frequency of the second filter network.
The bandpass filter at least loads a minor matters, transmission zero frequency position caused by the minor matters of bandpass filter
In in the band connection frequency of the first filter network.
The high-pass filter at least loads two minor matters, and transmission zero frequency caused by two minor matters is located at the first filter
In the band connection frequency of wave network and the second filter network.
First low-pass filter loads three minor matters, and one of minor matters are bent to the left；
Second low-pass filter loads two minor matters, and one of minor matters are L-type, another minor matters is connected for arcuate
The microstrip line of two minor matters is in 90 degree；
The high-pass filter loads five minor matters, each minor matters length be relatively shorter than two low band filters plus
It is long to carry minor matters.
Five minor matters of the high-pass filter, first minor matters are bent to the right, remaining minor matters is bent to the left, minor matters end
It is provided with evenly distributed round hole.
The beneficial effects of the utility model；
(1) the utility model realizes two filter networks using shared low-pass filter, reduces the complexity of circuit,
Promote inhibition；
(2) the utility model can realize very wide working frequency range using the structure of minor matters loading, while minor matters generate
Transmission zero can realize high-isolation and high rolloff-factor.
Description of the drawings
Fig. 1 is a kind of structure diagram of plane triplexer based on minor matters loading structure of the utility model；
Fig. 2 is the structure diagram of the first low-pass filter in Fig. 1；
Fig. 3 is the structure diagram of the second low-pass filter in Fig. 1；
Fig. 4 is the structure diagram of bandpass filter in Fig. 1；
Fig. 5 is the structure diagram of high-pass filter in Fig. 1；
Fig. 6 is the first T-shaped branch line structure diagram in the utility model；
Fig. 7 is the second T-shaped branch line structure diagram in the utility model；
Fig. 8 is the frequency response characteristic figure of the triplexer embodiment of the utility model.
Specific embodiment
With reference to embodiment and attached drawing, the utility model is described in further detail, but the reality of the utility model
It is without being limited thereto to apply mode.
Embodiment
As shown in Figure 1, a kind of plane triplexer based on minor matters loading structure, including upper-layer micro-strip structure, intermediate medium
Substrate and underlying metal floor,
The upper-layer micro-strip structure is filtered by the first low-pass filter 1, the second low-pass filter 2, bandpass filter 3, high pass
Wave device 4, the first T-shaped 5 and second T-shaped branch line 6 of branch line are formed, and the first T-shaped branch line and the second T-shaped branch line wrap
Include an input branch and two output branchs, first low-pass filter 1, the second low-pass filter 2, bandpass filter 3,
High-pass filter 4, the first filter network that the first T-shaped 5 and second T-shaped branch line 6 of branch line is formed, the second filter network and
Third filter network；First filter network and the second filter network shares the first low-pass filter, and it is low to reduce second
The circuit complexity of bandpass filter and bandpass filter.
First filter network, specific connection are as follows：From 50 input signal of input branch of the first T-shaped branch line, by
One output branch 51 of one T-shaped branch line is connected to the input terminal 11 of the first low-pass filter, then from the first low-pass filter
Output terminal 12 be connected to the input branch 60 of the second T-shaped branch line, then by an output branch of the second T-shaped branch line
61 are connected to the input terminal 21 of the second low-pass filter, are finally exported from the output terminal 22 of the second low-pass filter.
50 input signal of input branch of first T-shaped branch line connects by an output branch 51 of the first T-shaped branch line
The input terminal 11 of the first low-pass filter is connect, then the input of the 12 and second T-shaped branch line of output terminal of the first low-pass filter
Branch 60 connects, and the input terminal 31 of bandpass filter is connected by another output branch 62 of the second T-shaped branch line, finally from band
32 output signal of output terminal of bandpass filter forms the second filter network；
50 input signal of input branch of first T-shaped branch line, by another output branch 52 of the first T-shaped branch line
The input terminal 41 of high-pass filter is connected, from 42 output signal of output terminal of high-pass filter, forms third filter network.
First low-pass filter, the second low-pass filter, bandpass filter and high-pass filter using open circuit or
Short circuit loading realizes the promotion of isolation and roll-off characteristic, the quantity of minor matters determines transmission for generating the minor matters of transmission zero
The number of zero.
First low-pass filter at least loads a minor matters, and is transmitted caused by the minor matters of the first low-pass filter
Zero frequency is located in the band connection frequency of third filter network.
As shown in Fig. 2, in the present embodiment, the first low-pass filter is suitable according to from left to right there are three loading minor matters 13
Sequence, first and second minor matters are rectangular configuration, and third minor matters are L-shaped structure, and are bent to the left, reduce area.
Second low-pass filter at least loads a minor matters, transmission zero caused by the minor matters of the second low-pass filter
Dot frequency is located in the band connection frequency of the second filter network.
As shown in figure 3, in the present embodiment, the second low-pass filter is by loading two minor matters 23, a bending l-shaped, one
It is a to be bent into bow character form structure, it can effective saving components area.
The bandpass filter at least loads a minor matters, transmission zero frequency position caused by the minor matters of bandpass filter
In in the band connection frequency of the first filter network.
As shown in figure 4, bandpass filter, there are three loading minor matters 33, first and second minor matters is bent into L-shaped structure, the
Three minor matters are bent into " bow " type structure, connect two sections of microstrip lines of minor matters in 90 °, save area.
As shown in figure 5, high-pass filter, there are five loading minor matters 43, each minor matters length is relatively shorter than two low-frequency ranges
The loading minor matters of wave filter are long, sequence from left to right, and first loading minor matters is bent to the right, remaining minor matters is bent to the left,
The evenly distributed round hole in minor matters end to form short-circuit minor matters for being metallized via by being grounded.
As shown in fig. 6, the first T-shaped branch line and the second T-shaped branch line are respectively provided with an input branch and two outputs point
Branch line.
The width of above-mentioned wave filter loading minor matters is used to be used for adjusting the matching status of the port of each wave filter.
It is illustrated in figure 7 the T-shaped minor matters that input port cascades the first low-pass filter and high-pass filter up and down, T-shaped branch
Section is equal with the micro belt line width of the junction of two wave filters, can efficiently solve the discontinuity of microstrip line, reduces micro-
The error that discontinuity is brought in strip line structure.
As an example, the parameters of the present embodiment are described as follows below：
As shown in Figures 2 to 7, L1To L42And W1To W42Each dimensions length of the present embodiment is designated, it is specific as follows：
L1Equal to 9.1mm, W1Equal to 3.25mm；L2Equal to 10.35mm, W2Equal to 17.6mm；L3Equal to 18.35mm, W3Deng
In 1.8mm；L4Equal to 21.1mm, W4Equal to 12.25mm；L5Equal to 23.3mm, W5Equal to 1.8mm；L6Equal to 31.8mm, W6It is equal to
4.7mm；L7Equal to 9.33mm, W7Equal to 2.55mm；L8Equal to 4.4mm, W8Equal to 1.8mm；L9Equal to 143mm, W9It is equal to
1.7mm；L10Equal to 130.7mm, W10Equal to 7mm；L11Equal to 81.4mm, W11Equal to 2.5mm；L12Equal to 117.6mm, W12It is equal to
4mm；L13Equal to 6.1mm, W13Equal to 4.7mm；L14Equal to 20.3mm, W14Equal to 1.2mm；L15Equal to 78.8mm, W15It is equal to
2.2mm；L16Equal to 28.85mm, W16Equal to 1.8mm；L17Equal to 77.85mm, W17Equal to 6mm；L18Equal to 33.8mm, W18It is equal to
1.8mm；L19Equal to 57.5mm, W19Equal to 3.85mm；L20Equal to 10.85mm, W20Equal to 4.2mm；L21Equal to 2.53mm, W21Deng
In 6.45mm；L22Equal to 10.75mm, W22Equal to 3.6mm；L23Equal to 14.95mm, W23Equal to 2.8mm；L24Equal to 31.1mm,
W24Equal to 5.15mm；L25Equal to 14mm, W25Equal to 5mm；L26Equal to 14.95mm, W26Equal to 2.4mm；L27Equal to 20.35mm,
W27Equal to 4.25mm；L28Equal to 15.7mm, W28Equal to 0.85mm；L29Equal to 25.15mm, W29Equal to 3.85mm；L30It is equal to
6.9mm, W30Equal to 5mm；L31Equal to 14.95mm, W31Equal to 4.6mm；L32Equal to 24.75mm, W32Equal to 4.15mm；L33It is equal to
22.5mm W33Equal to 2.35mm；L34Equal to 5mm, W34Equal to 4.2mm；L35Equal to 5mm, W35Equal to 4.2mm；L36It is equal to
10.1mm W36Equal to 3.25mm；L37Equal to 5.25mm, W37Equal to 1mm；L38Equal to 55.9mm, W38Equal to 1.9mm；L39It is equal to
6.45mm W39Equal to 4.43mm；L40Equal to 9.33mm, W40Equal to 2.55mm；L41Equal to 16.45mm, W41Equal to 2.15mm；L42
Equal to 8.7mm, W42Equal to 3mm.The thickness of medium substrate employed in present case is 1.524mm, and relative dielectric constant is
2.55, dielectric loss tangent 0.003, whole copper facing on microstrip line, copper thickness 1oz, the circle in high-pass filter loading minor matters
Hole is metallization VIA, and the area of entire device is 14mm*17mm.
Experimental result is as shown in figure 8, include S in figure11,S21,S31And S41Four curves, three passbands of the triplexer
Positioned at 350-470MHz, tri- frequency ranges of 698-960MHz, 1.71-2.7GHz, the insertion loss of three job networks is respectively less than
0.9dB, passband fluctuation are less than 0.5dB, and return loss is all higher than 17dB, and Out-of-band rejection is more than 25dB.In high frequency pass band two it is low
The insertion loss that frequency range generates is all higher than 35dB, by way of cascading the first low-pass filter, realizes and two low-frequency ranges are produced
Effective inhibition of raw higher hamonic wave reduces the required minor matters number of two low-frequency filters, while circuit is simplified, reaches
Better inhibition is arrived.
To sum up, the utility model provides a triplexer based on minor matters loading structure, is using four wave filters
In the case of can effectively improve inhibition of the first two filter network in high frequency pass band, have Insertion Loss it is small, good wave filtering effect, isolation effect
The good excellent properties of fruit, can be widely applied in the radio-frequency front-end of wireless communication system.
The utility model uses open circuit and short-circuit minor matters loading structure, and minor matters quantity and size determine the number of transmission zero
And position, the transmission zero that loading minor matters generate improve inhibition and roll-off characteristic；Minor matters are bent to reduce face
Product；The triplexer realized in traditional design using three wave filters is different from, the utility model makes in the first two filter network
With shared low-pass filter, good inhibition is realized in highest frequency range, reduces minor matters quantity, it is complicated to reduce circuit
Property.
Above-described embodiment is the preferable embodiment of the utility model, but the embodiment of the utility model is not by described
The limitation of embodiment, the change made under other any Spirit Essences and principle without departing from the utility model are modified, are replaced
In generation, simplifies combination, should be equivalent substitute mode, is included within the scope of protection of the utility model.
Claims (8)
1. a kind of plane triplexer based on minor matters loading structure, including upper-layer micro-strip structure, intermediate medium substrate and bottom gold
Possession plate, which is characterized in that the upper-layer micro-strip structure by the first low-pass filter, the second low-pass filter, bandpass filter,
High-pass filter, the first T-shaped branch line and the second T-shaped branch line are formed, the first T-shaped branch line and the second T-branch line
Include an input branch and two output branchs, specific connection is as follows：
The input branch input signal of first T-shaped branch line is low by the output branch connection first of the first T-shaped branch line
The input terminal of bandpass filter, the output terminal of the first low-pass filter are connect with the input branch of the second T-shaped branch line, and then second
One output branch of T-shaped branch line connects the input terminal of the second low-pass filter, and signal is from the second first low pass filter output
Output forms the first filter network；
The input branch input signal of first T-shaped branch line is low by the output branch connection first of the first T-shaped branch line
The input terminal of bandpass filter, then the output terminal of the first low-pass filter connect with the input branch of the second T-shaped branch line, by
The input terminal of another output branch connection bandpass filter of two T-shaped branch lines, it is finally defeated from the output terminal of bandpass filter
Go out signal, form the second filter network；
The input branch input signal of first T-shaped branch line connects high pass by another output branch of the first T-shaped branch line
The input terminal of wave filter from the output terminal output signal of high-pass filter, forms third filter network.
2. plane triplexer according to claim 1, which is characterized in that first low-pass filter, the second low pass filtered
Wave device, bandpass filter and high-pass filter load the minor matters for generating transmission zero using open circuit or short circuit.
3. plane triplexer according to claim 1, which is characterized in that first low-pass filter at least loads one
Minor matters, and transmission zero frequency caused by the minor matters of the first low-pass filter is located in the band connection frequency of third filter network.
4. plane triplexer according to claim 1, which is characterized in that second low-pass filter at least loads one
Minor matters, transmission zero frequency caused by the minor matters of the second low-pass filter are located in the band connection frequency of the second filter network.
5. plane triplexer according to claim 1, which is characterized in that the bandpass filter at least loads a branch
Section, transmission zero frequency caused by the minor matters of bandpass filter are located in the band connection frequency of the first filter network.
6. plane triplexer according to claim 1, which is characterized in that the high-pass filter at least loads two branches
Section, transmission zero frequency caused by two minor matters are located in the band connection frequency of the first filter network and the second filter network.
7. plane triplexer according to claim 1, which is characterized in that the first low-pass filter loads three minor matters, and
One of minor matters are bent to the left；
Second low-pass filter loads two minor matters, and one of minor matters are L-type, another minor matters connects two for arcuate
The microstrip line of minor matters is in 90 degree；
The high-pass filter loads five minor matters, and the loading minor matters that each minor matters length is respectively less than two low-pass filters are long.
8. plane triplexer according to claim 7, which is characterized in that five minor matters of the high-pass filter, first
A minor matters are bent to the right, remaining minor matters is bent to the left, and minor matters end is provided with evenly distributed round hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721562818.8U CN207517832U (en) | 2017-11-21 | 2017-11-21 | A kind of plane triplexer based on minor matters loading structure |
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| CN201721562818.8U CN207517832U (en) | 2017-11-21 | 2017-11-21 | A kind of plane triplexer based on minor matters loading structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834135A (en) * | 2017-11-21 | 2018-03-23 | 华南理工大学 | A kind of plane triplexer based on minor matters loading structure |
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- 2017-11-21 CN CN201721562818.8U patent/CN207517832U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834135A (en) * | 2017-11-21 | 2018-03-23 | 华南理工大学 | A kind of plane triplexer based on minor matters loading structure |
| CN107834135B (en) * | 2017-11-21 | 2020-02-18 | 华南理工大学 | Planar triplexer based on branch knot loading structure |
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