CN221058295U - 1800MHz wave band mobile communication repeater - Google Patents
1800MHz wave band mobile communication repeater Download PDFInfo
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- CN221058295U CN221058295U CN202322834376.XU CN202322834376U CN221058295U CN 221058295 U CN221058295 U CN 221058295U CN 202322834376 U CN202322834376 U CN 202322834376U CN 221058295 U CN221058295 U CN 221058295U
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- 238000010295 mobile communication Methods 0.000 title claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
The utility model discloses a mobile communication repeater in 1800MHz wave band, which comprises a frequency conversion filter circuit; the frequency conversion filter circuit comprises a first pi attenuation, a first radio frequency filter, a frequency conversion unit, a second radio frequency filter and a second pi attenuation which are sequentially connected in series. The mobile communication repeater generates an intermediate frequency (< 100 MHz) signal by filtering an 1800MHz radio frequency signal, and then converts the frequency back to 1800MHz after the intermediate frequency signal is filtered by an intermediate frequency filter. The intermediate frequency filter can select a center frequency point and a working bandwidth according to the actual working frequency band. Compared with a radio frequency filter, the intermediate frequency filter has the advantages of good in-band flatness, good out-of-band rejection and the like. And further, the overall effect of the repeater equipment is improved.
Description
Technical Field
The utility model relates to the field of mobile communication equipment, in particular to an 1800MHz band mobile communication repeater.
Background
In the 1800MHz band, mobile telecommunications has spectrum planning, and each operator spectrum resource is in a continuous state without intermediate guard intervals. For 1800MHz repeater equipment, if the filter effect is not good, the situation that signals of multiple operators are amplified simultaneously can occur, or the signal distortion is caused by poor in-band flatness effect, or the interference problem is caused by poor out-of-band suppression.
Disclosure of utility model
The utility model aims to provide a mobile communication repeater which has novel and unique structure, is convenient to use and can solve the problem of direct mutual interference of 1800MHz frequency band operator signals; the specific technical scheme is as follows:
A mobile communication repeater in 1800MHz band comprises a frequency conversion filter circuit; the frequency conversion filter circuit comprises a first pi-shaped attenuation, a first radio frequency filter, a frequency conversion unit, a second radio frequency filter and a second pi-shaped attenuation which are sequentially connected in series.
Further, the frequency conversion unit comprises a first mixer, a local oscillator, a power divider, an intermediate frequency filter and a second mixer, wherein the input end of the power divider is connected with the output end of the local oscillator, and the first input end of the first mixer is connected with the first output end of the power divider; the second input end is connected with the first radio frequency filter and outputs an intermediate frequency signal at the output end of the first mixer; the intermediate frequency signal is filtered by the intermediate frequency filter and then is connected to the first input end of the second mixer, the second input end of the second mixer is connected with the second output end of the power divider, and the output end of the second mixer is connected with the input end of the second radio frequency filter.
Further, the detector circuit is used for detecting the intensity of the output signal; and an output signal of the detection circuit is connected with the controller.
Further, a first numerical control attenuator is arranged between the first pi-shaped attenuation and the first radio frequency filter; the controller is connected with a control port of the first numerical control attenuator.
Further, a second digital control attenuator is arranged between the second pi-shaped attenuation and the second radio frequency filter; the controller is connected with a control port of the second digital attenuator.
The mobile communication repeater generates an intermediate frequency (< 100 MHz) signal by filtering an 1800MHz radio frequency signal, and then converts the frequency back to 1800MHz after the intermediate frequency signal is filtered by an intermediate frequency filter. The intermediate frequency filter can select a center frequency point and a working bandwidth according to the actual working frequency band. Compared with a radio frequency filter, the intermediate frequency filter has the advantages of good in-band flatness, good out-of-band rejection and the like. And further, the overall effect of the repeater equipment is improved.
Drawings
Fig. 1 is a schematic diagram of a signal downlink circuit of a mobile communication repeater according to the present utility model;
Fig. 2 is a schematic diagram of an uplink circuit of a mobile communication repeater signal according to the present utility model.
Description of the embodiments
The present utility model will be described more fully with reference to the following examples. This utility model may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein.
As shown in fig. 1 and 2, the 1800MHz band mobile communication repeater in the present embodiment is provided with a frequency conversion filter circuit; the 1800MHz signal and the local oscillation signal are converted into intermediate frequency signals below 100MHz through a mixer by a frequency conversion filter circuit; the characteristics of good in-band flatness and good out-of-band rejection of the intermediate frequency filter are utilized to remove interference signals as much as possible; obtaining purer intermediate frequency signals and converting the purer intermediate frequency signals and local oscillation signals into 1800MHz radio frequency signals through a mixer; the interference component in the output signal is less through conversion; signal interference between different operators of adjacent frequency bands is reduced.
Taking a signal downlink circuit as an example for analysis; the structure of the signal uplink circuit is the same as that of the signal uplink circuit.
The frequency conversion filter circuit in the embodiment comprises a first pi-attenuation, a first radio frequency filter, a frequency conversion unit, a second radio frequency filter and a second pi-attenuation which are sequentially connected in series; the input signal adjusts the signal amplitude through a first pi decay; removing part of interference signals through a first radio frequency filter, wherein the gap of the 1800MHz band is smaller; it is inevitable to mix in signals of other operators. The frequency conversion unit converts the radio frequency signal into an intermediate frequency signal and then performs intermediate frequency filtering, so that interference signals from other operators can be basically eliminated. Mixing the intermediate frequency signal with small distortion to generate a radio frequency signal, sorting the radio frequency signal by a second radio frequency filter, and adjusting the radio frequency signal to be a signal matched with a transmitting antenna by second pi attenuation; transmitted to the terminal through the antenna. The radio frequency filter, the intermediate frequency filter and the local oscillator are specifically designed according to the frequency band and the center frequency point of the signal to be transmitted by the mobile communication repeater; the design method belongs to the conventional technical means and is not described in detail here.
The frequency conversion unit comprises a first mixer, a local oscillator, a power divider, an intermediate frequency filter and a second mixer, wherein the input end of the power divider is connected with the output end of the local oscillator, and the first input end of the first mixer is connected with the first output end of the power divider; the second input end is connected with the first radio frequency filter and outputs an intermediate frequency signal at the output end of the first mixer; the intermediate frequency signal is filtered by the intermediate frequency filter and then is connected to the first input end of the second mixer, the second input end of the second mixer is connected with the second output end of the power divider, and the output end of the second mixer is connected with the input end of the second radio frequency filter.
In order to avoid the output signal from being too low or too high, a detection circuit for detecting the intensity of the output signal is also arranged at the signal output end; the output signal of the detection circuit is connected with a controller (not shown in the figure); the intensity of the output signal is monitored by a controller.
Pi attenuation can be added between the first radio frequency filter and the first mixer to carry out signal arrangement, so that interference signals are further reduced.
Because of network reasons, the signal intensity received by the repeater can change, and a first numerical control attenuator is arranged between the first pi attenuation and the first radio frequency filter in order to provide signals with stable intensity for the frequency conversion unit; the controller is connected with a control port of the first numerical control attenuator; the controller can dynamically adjust parameters of the first numerical control attenuator according to the signal intensity fed back by the detection circuit.
A second digital control attenuator is arranged between the second radio frequency filter and the second pi-shaped attenuator; the controller is connected with a control port of the second digital attenuator. And when the equipment is debugged, the controller is used for setting the parameters controlled by the second digital attenuator, so that the intensity of an output signal is ensured to be matched with the transmitting antenna.
The mobile communication repeater generates an intermediate frequency signal by filtering an 1800MHz radio frequency signal, wherein the signal frequency is less than 100 MHz; after filtering by the intermediate frequency filter, the frequency is converted back to 1800MHz. The intermediate frequency filter can select a center frequency point and a working bandwidth according to the actual working frequency band. Compared with a radio frequency filter, the intermediate frequency filter has the advantages of good in-band flatness, good out-of-band rejection and the like. And further, the overall effect of the repeater equipment is improved.
The above examples are for illustration of the utility model only and, in addition, there are many different embodiments which will be apparent to those skilled in the art after having the insight into the present utility model and are not explicitly recited herein.
Claims (5)
1. An 1800MHz band mobile communication repeater is characterized by comprising a frequency conversion filter circuit; the frequency conversion filter circuit comprises a first pi-shaped attenuation, a first radio frequency filter, a frequency conversion unit, a second radio frequency filter and a second pi-shaped attenuation which are sequentially connected in series.
2. The mobile communication repeater of claim 1, wherein the frequency conversion unit comprises a first mixer, a local oscillator, a power divider, an intermediate frequency filter and a second mixer, wherein an input end of the power divider is connected with an output end of the local oscillator, and a first input end of the first mixer is connected with a first output end of the power divider; the second input end is connected with the first radio frequency filter and outputs an intermediate frequency signal at the output end of the first mixer; the intermediate frequency signal is filtered by the intermediate frequency filter and then is connected to the first input end of the second mixer, the second input end of the second mixer is connected with the second output end of the power divider, and the output end of the second mixer is connected with the input end of the second radio frequency filter.
3. The mobile communication repeater of claim 1, further comprising a detection circuit for detecting the strength of the output signal; and an output signal of the detection circuit is connected with the controller.
4. A mobile communications repeater as claimed in claim 3, wherein a first digitally controlled attenuator is provided between the first pi-attenuation and the first radio frequency filter; the controller is connected with a control port of the first numerical control attenuator.
5. A mobile communications repeater as claimed in claim 3, wherein a second digital attenuator is provided between the second pi-attenuation and the second radio frequency filter; the controller is connected with a control port of the second digital attenuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322834376.XU CN221058295U (en) | 2023-10-23 | 2023-10-23 | 1800MHz wave band mobile communication repeater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322834376.XU CN221058295U (en) | 2023-10-23 | 2023-10-23 | 1800MHz wave band mobile communication repeater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221058295U true CN221058295U (en) | 2024-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322834376.XU Active CN221058295U (en) | 2023-10-23 | 2023-10-23 | 1800MHz wave band mobile communication repeater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221058295U (en) |
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2023
- 2023-10-23 CN CN202322834376.XU patent/CN221058295U/en active Active
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