CN207910037U - A kind of miniaturization LTE cavity body filters applied to diversity reception digital optical fiber direct station - Google Patents
A kind of miniaturization LTE cavity body filters applied to diversity reception digital optical fiber direct station Download PDFInfo
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- CN207910037U CN207910037U CN201721366715.4U CN201721366715U CN207910037U CN 207910037 U CN207910037 U CN 207910037U CN 201721366715 U CN201721366715 U CN 201721366715U CN 207910037 U CN207910037 U CN 207910037U
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- optical fiber
- diversity reception
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Abstract
The utility model discloses a kind of miniaturization LTE cavity body filters applied to diversity reception digital optical fiber direct station, it includes filter cavity（1）And filter cover board（2）, filter cavity（1）And filter cover board（2）Form bandpass filtering unit（3）；Bandpass filtering unit（3）In containing there are six coaxial resonant cavity（4）, coaxial resonant cavity（4）In contain resonant rod（5）；Non-conterminous two coaxial resonant cavities（4）Between pass through isolation bar（6）It separates, adjacent coaxial resonant cavity（4）Between pass through couple window（7）It separates；First resonant cavity of bandpass filtering unit（8）With signal input port（9）Connection, the 6th resonant cavity of bandpass filtering unit（10）With signal output port（11）Connection.The utility model has the beneficial effects that：Compact-sized, performance indicator is excellent, is conducive to diversity reception LTE digital optical fiber direct stations.
Description
Technical field
The utility model is related to mobile communication technology fields, especially a kind of to be applied to diversity reception digital optical fiber direct station
Miniaturization LTE cavity body filters.
Background technology
Digital high-frequency amplification station is to be set the repeater class that optical transport is carried out after analog signal digital using digital if technology
Standby, core technology is digitised Intermediate Frequency technology, and higher as technology content in indoor distributed system product, system index is higher
New generation product be in industry widely used instead of simulation repeater etc. equipment.Digital high-frequency amplification station is made at present
To solve a kind of preferred embodiment that communication network extends over ability.Necessary hand as realization " low capacity, big covering " target
One of section, is mainly to ensure the network coverage under the premise of not increasing base station number due to the use of repeater one, second is that it is made
Valence is well below the micro cellular system for having effect same.Repeater is a kind of preferred side for solving communication network and extending over ability
Case.It has the advantages that compared with base station it is simple in structure, investment it is less and easy for installation, can be widely used for the blind area for being difficult to cover and
Weak area, such as market, hotel, airport, harbour, station, gymnasium, amusement hall, subway, tunnel, highway, the various fields in island
The problems such as institute improves communication quality, solves call drop.Digital high-frequency amplification station has noise low simultaneously, and networking mode is flexible, and equipment is stablized
The advantages that property higher, therefore be with a wide range of applications in network construction.LTE2.1G cavity body filters are located at band diversity work(
In the LTE2.1G optical fiber repeater far-end machines of energy, the electric signal received is sent into this band logical by the reception antenna in communication system
In filter, this bandpass filter is independent by uplink signal access one by downlink signal and after waiting other interference signals to filter out
Uplink diversity reception radio frequency link, subsequently through amplification, opto-electronic conversion, modulation etc. is transferred to proximal end after series of processes, logical in proximal end
It is sent to base station diversity interface after crossing respective radio-frequency processing.Result in formation of base station dual-antenna reception links so that base station connects
It is more sensitive to receive mobile phone signal, is reflected in coverage area, base station can also be transferred to from the farther mobile phone signal in base station.
Utility model content
The shortcomings that the purpose of the utility model is to overcome the prior arts, provides a kind of compact-sized, and performance indicator is excellent,
Be conducive to the miniaturization applied to diversity reception digital optical fiber direct station of the miniaturization of diversity reception LTE digital optical fiber direct stations
LTE cavity body filters.
The purpose of this utility model is achieved through the following technical solutions：One kind is directly put applied to diversity reception digital fiber
The miniaturization LTE cavity body filters stood, it includes filter cavity and filter cover board, the filter cavity and filter
Cover board forms bandpass filtering unit；Containing there are six coaxial resonant cavity in bandpass filtering unit, contain resonant rod in coaxial resonant cavity；
It is separated by isolation bar between non-conterminous two coaxial resonant cavities, is separated by coupling window between adjacent coaxial resonant cavity
It opens；First resonant cavity of bandpass filtering unit is connected to signal input port, the 6th resonant cavity and signal of bandpass filtering unit
Output port is connected to.
The signal input port to signal input port is followed successively by the first resonant rod, the second resonant rod, third resonance
Bar, the 4th resonant rod, the 5th resonant rod and the 6th resonant rod.
The bandpass filtering unit is LTE2.1G uplink signal bandpass filtering units.
It is provided with coupling screws between the coupling window.
The height of the resonant rod is 25.2mm, outer diameter 13mm, internal diameter 10mm.
It is provided with the first cross-couplings between the first resonant rod and third resonant rod of the bandpass filtering unit.
It is provided with the second cross-couplings between the 4th resonant rod and the 6th resonant rod of the bandpass filtering unit.
The utility model has the following advantages：Contain 6 coaxial resonant cavities in the bandpass filtering unit of the utility model, together
Containing LTE2.1G resonant rods in axis resonant cavity so that the uplink signal that reception antenna receives is sent into this bandpass filter, this
Bandpass filter connects by downlink signal and by one independent uplink diversity of uplink signal access after waiting other interference signals to filter out
Radio frequency link is received, base station dual-antenna reception link, reality of the realization diversity reception function in optical fiber and digital direct discharging station are formd
It is existing.This LTE2.1G upstream filter is compact-sized, and performance indicator is excellent, is conducive to diversity reception LTE2.1G direct discharging stations
Miniaturization.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the structural schematic diagram of bandpass filtering unit in Fig. 1；
In figure, 1- filter cavities, 2- filter cover boards, 3- bandpass filtering units, 4- coaxial resonant cavities, 5- resonant rods,
6- isolation bars, 7- couple window, the first resonant cavities of 8-, 9- signal input ports, the 6th resonant cavities of 10-, 11- signal output ends
Mouthful, the first cross-couplings of 12-, the second cross-couplings of 13-.
Specific implementation mode
The utility model is further described below in conjunction with the accompanying drawings, the scope of protection of the utility model be not limited to
It is lower described：
As shown in Figure 1 and 2, a kind of miniaturization LTE cavity body filters applied to diversity reception digital optical fiber direct station, it
Including filter cavity 1 and filter cover board 2, the filter cavity 1 and filter cover board 2 form bandpass filtering unit 3；
Containing there are six coaxial resonant cavity 4 in bandpass filtering unit 3, resonant rod 5 is contained in coaxial resonant cavity 4；Non-conterminous two coaxial
It is separated by isolation bar 6 between resonant cavity 4, is separated between adjacent coaxial resonant cavity 4 by coupling window 7；Bandpass filtering list
First resonant cavity 8 of member is connected to signal input port 9, the 6th resonant cavity 10 and signal output port 11 of bandpass filtering unit
Connection.
As shown in Figure 1 and 2, the signal input port 9 to signal input port 9 is followed successively by the first resonant rod, second humorous
Shake bar, third resonant rod, the 4th resonant rod, the 5th resonant rod and the 6th resonant rod.The bandpass filtering unit 3 is
LTE2.1G uplink signal bandpass filtering units.It is provided with coupling screws between the coupling window 7.The resonant rod
Height is 25.2mm, outer diameter 13mm, internal diameter 10mm.The first resonant rod and third resonance of the bandpass filtering unit 3
The first cross-couplings 12 are provided between bar.It is set between the 4th resonant rod and the 6th resonant rod of the bandpass filtering unit 3
It is equipped with the second cross-couplings 13.
The bandpass filtering unit passes through frequency using coupling coaxial resonant cavity structure from lowpass prototype filter
Transformation, the mutual cascade between realizing each resonant cavity with impedance transformer, each performance to obtain bandpass filter refer to
Mark.Bandpass filtering chamber is based on direct-coupled cavities filter theory, and cascading multiple stages coaxial resonant cavities realizes chebyshev function
The transmission curve of response.Coaxial resonant cavity is the quarter-wave coaxial line of one section of short at one end, and equivalent circuit is together
Joining resonant tank, this resonant tank is since its energy of electromagnetic field almost all is closed in the cavity, almost without radiation loss,
Therefore it can reach higher quality factor, coaxial resonant cavity filter is with insertion loss is small, Out-of-band rejection is high and bears power
The features such as high.
Coupling screws are provided between the coupling window 7, wears and is deep into inside cavity from cover board, for adjusting coupling
Intensity is closed, the diameter of the depth and screw that enhance coupling screws can increase the stiffness of coupling between resonant cavity.Each resonant rod
Coupling power determines the bandwidth of filter pass band, and the bandpass filtering chamber in the utility model is using the shape that opens a window between coaxial resonant cavity
At magnetic couplings, the part that isolation bar protrudes in each filtering chamber is coupling windowing part between resonant cavity, and window is bigger,
The degree of coupling is stronger, confirms the corresponding coefficient of coup using the emulation of HFSS simulation softwares, method is the two-chamber knot for intercoupling
Structure, to coupled structure size scanning parameter, corresponding coupling window size song when having obtained one group with coupling window size variation
Line chooses coupling window mouth size by the point of the corresponding coefficient of coup.
Utility model works principle is：When accessing the signal that antenna end receives, signal is through LTE2.1G bandpass signals
Input port inputs the LTE2.1G bandpass filtering chambers being made of six roots of sensation LTE2.1G resonant rods, the LTE2.1G bandpass filterings
Chamber filters out the out of band signal in LTE2.1G uplink signals, is then exported from signal output port 11；This bandpass filter is by downlink
Signal and uplink signal is accessed into an independent uplink diversity reception radio frequency link after waiting other interference signals to filter out, it is follow-up to pass through
It is transferred to proximal end after series of processes, is sent after being handled proximally by respective radio-frequency to base station diversity interface.Result in formation of
Base station dual-antenna reception link, reduces the influence of channel fading, improves the reliability of transmission and the sensitivity of base station reception.
This LTE2.1G bandpass filter structures is compact, and performance indicator is excellent, is conducive to the small of diversity reception LTE2.1G direct discharging stations
Type.
Claims (7)
1. a kind of miniaturization LTE cavity body filters applied to diversity reception digital optical fiber direct station, it is characterised in that：It includes
Filter cavity（1）And filter cover board（2）, the filter cavity（1）And filter cover board（2）Form bandpass filtering list
Member（3）；Bandpass filtering unit（3）In containing there are six coaxial resonant cavity（4）, coaxial resonant cavity（4）In contain resonant rod（5）；No
Two adjacent coaxial resonant cavities（4）Between pass through isolation bar（6）It separates, adjacent coaxial resonant cavity（4）Between pass through coupling window
Mouthful（7）It separates；First resonant cavity of bandpass filtering unit（8）With signal input port（9）Connection, the of bandpass filtering unit
Six resonant cavities（10）With signal output port（11）Connection.
2. a kind of miniaturization LTE cavitys applied to diversity reception digital optical fiber direct station according to claim 1 filter
Device, it is characterised in that：The signal input port（9）To signal input port（9）It is followed successively by the first resonant rod, the second resonance
Bar, third resonant rod, the 4th resonant rod, the 5th resonant rod and the 6th resonant rod.
3. a kind of miniaturization LTE cavitys applied to diversity reception digital optical fiber direct station according to claim 1 filter
Device, it is characterised in that：The bandpass filtering unit（3）For LTE2.1G uplink signal bandpass filtering units.
4. a kind of miniaturization LTE cavitys applied to diversity reception digital optical fiber direct station according to claim 1 filter
Device, it is characterised in that：The coupling window（7）Between be provided with coupling screws.
5. a kind of miniaturization LTE cavitys applied to diversity reception digital optical fiber direct station according to claim 1 filter
Device, it is characterised in that：The resonant rod（5）Height be 25.2mm, outer diameter 13mm, internal diameter 10mm.
6. a kind of miniaturization LTE cavitys applied to diversity reception digital optical fiber direct station according to claim 1 filter
Device, it is characterised in that：The bandpass filtering unit（3）The first resonant rod and third resonant rod between be provided with the first intersection
Coupling（12）.
7. a kind of miniaturization LTE cavitys applied to diversity reception digital optical fiber direct station according to claim 1 filter
Device, it is characterised in that：The bandpass filtering unit（3）The 4th resonant rod and the 6th resonant rod between be provided with the second intersection
Coupling（13）.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721366715.4U CN207910037U (en) | 2017-10-23 | 2017-10-23 | A kind of miniaturization LTE cavity body filters applied to diversity reception digital optical fiber direct station |
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| CN201721366715.4U CN207910037U (en) | 2017-10-23 | 2017-10-23 | A kind of miniaturization LTE cavity body filters applied to diversity reception digital optical fiber direct station |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054477A (en) * | 2017-10-23 | 2018-05-18 | 四川天邑康和通信股份有限公司 | A kind of miniaturization LTE cavity body filters applied to diversity reception digital optical fiber direct station |
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2017
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054477A (en) * | 2017-10-23 | 2018-05-18 | 四川天邑康和通信股份有限公司 | A kind of miniaturization LTE cavity body filters applied to diversity reception digital optical fiber direct station |
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