CN216751729U - Based on anti-interference project organization of vehicle radio station radio frequency front end - Google Patents
Based on anti-interference project organization of vehicle radio station radio frequency front end Download PDFInfo
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- CN216751729U CN216751729U CN202123159239.8U CN202123159239U CN216751729U CN 216751729 U CN216751729 U CN 216751729U CN 202123159239 U CN202123159239 U CN 202123159239U CN 216751729 U CN216751729 U CN 216751729U
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Abstract
The utility model provides an anti-interference design structure based on radio frequency front end of mobile station. The anti-interference design structure based on the radio frequency front end of the vehicle-mounted radio station comprises a primary radio station part and a radio frequency front end anti-interference module arranged at the front end of the primary radio station part, wherein the primary radio station part comprises a channel module and a power amplifier/filter module; the radio frequency front end anti-interference module comprises two groups of radio frequency switches, an anti-interference filter circuit, a receiving access circuit and a power sampling circuit. The utility model provides an anti-interference project organization based on radio station radio frequency front end, anti-interference filter circuit's design, the problem of noise suppression takes outside when solving transmission and receiving, it is low to have insertion loss simultaneously, bear the characteristics that power is high, receive the design of route circuit, the sensitivity that insertion loss that the solution anti-interference module introduced brought descends, the simultaneous design has the linearity that the AGC circuit keeps the channel, open short-circuit protection and receive the time large-signal protect function when anti-interference module transmission is realized to power sampling circuit's design.
Description
Technical Field
The utility model relates to a radio frequency front end anti-interference technology field especially relates to a based on anti-interference project organization of vehicle radio station radio frequency front end.
Background
With the rapid progress of wireless communication technology, wireless communication devices with various functions are widely used, communication vehicles are provided with various communication devices, due to the fact that frequency spectrum resources are limited, working frequencies of different communication devices are often not far apart, the installation space of communication vehicle antennas is limited, the antennas are close to each other, and the transmitting power is high, the antennas interfere with each other greatly or even cannot work normally.
Taking two radio stations 1 and 2 with different working frequencies as an example, the antenna installation distance is small, the two radio stations are required to work simultaneously and do not interfere with each other, and after analysis and verification, when the two radio stations are in a receiving state or a transmitting state at the same time, the mutual interference does not exist; when two kinds of radio stations are in a state of receiving and dispatching, there is the biggest mutual interference, and the receiving radio station can not normally work, and received signal is blockked, and radio station 1, 2 operating frequency range are different (operating frequency radio station 1 > radio station 2), and radio station 1, 2 transmitter end have corresponding wave filter can restrain far-end outband noise, so power amplifier's broadband noise interference can be ignored, through the most serious interference between the following interference of analysis and experimental test for radio station 1, 2:
station 1 is in a transmitting state, station 2 is in a receiving state:
the transmission of the radio station 1 is not affected, and the interference signal received by the radio station 2 is a strong interference signal generated by the transmission of the main frequency of the radio station 1;
station 1 is in a receiving state, station 2 is in a transmitting state:
the transmission of the radio station 2 is not affected, and the interference signals received by the radio station 1 are strong interference signals generated by the main frequency transmitted by the radio station 2 and in-band interference signals generated by the harmonic frequency transmitted by the radio station 2 in the receiving frequency range of the radio station 1.
The radio frequency front end module of the radio station 1 needs to restrain the main frequency strong interference signal transmitted by the radio station 2 by more than or equal to 60dB, so that the front end low noise amplifier can be in a linear amplification area, and the normal receiving of the radio station 1 is not influenced.
From the above analysis it is clear that the stations 1, 2 must be able to work simultaneously and not interfere with each other:
when the radio station 2 receives, the influence of the main frequency transmitted by the radio station 1 cannot be generated;
when the radio station 2 transmits, its transmission harmonic component cannot affect the reception of the radio station 1, i.e. the harmonic amplitude < sensitivity: -110 dBm.
The isolation through between the actual measurement antenna is 30 ~ 40dB, including antenna self isolation and space loss, the isolation value is 30dB between the antenna during the design, promptly: when the transmitting power of the radio station 1 is +47dBm, the amplitude of the interference signal from the radiation signal to the antenna port of the radio station 2 is as follows: when +47dBm-30dB is +17dBm, the large signal enters a Low Noise Amplifier (LNA) without being suppressed at the front end during reception, which causes saturation distortion of the LNA, decreases gain and linearity, and degrades the reception performance of the entire apparatus.
When the transmission power of the radio station 2 is +47dBm, in order to prevent the harmonic component from affecting the reception of the radio station 1, the amplitude of the harmonic component must be less than-110 dBm, and considering that the separation degree between the antennas is 30dB, the amplitude of the actual transmission harmonic component of the radio station 2 is less than-110 dBm +30 dB-80 dBm, the harmonic suppression is > +47dBm- (-80dBm) -127 dB, and the actual measurement value of the harmonic suppression index of the conventional radio station 2 is not less than 80dB (third harmonic component and above), so that the suppression of the single harmonic filter is difficult to achieve due to factors such as spatial coupling and common ground crosstalk.
Therefore, it is necessary to provide an anti-interference design structure based on the radio frequency front end of the car radio station to solve the above technical problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides a based on the anti-interference project organization of vehicle radio station radio frequency front end, different frequency channel radio station simultaneous working mutual interference's electromagnetic compatibility's problem when having solved vehicle radio station loading.
In order to solve the technical problem, the anti-interference design structure based on the radio frequency front end of the vehicle-mounted radio station comprises a primary radio station part and a radio frequency front end anti-interference module arranged at the front end of the primary radio station part, wherein the primary radio station part comprises a channel module and a power amplifier/filter module; the radio frequency front end anti-interference module comprises two groups of radio frequency switches, an anti-interference filter circuit, a receiving access circuit and a power sampling circuit: the anti-interference filter circuit comprises an anti-interference band-pass filter with separated cavities; the receiving path circuit comprises an amplitude limiting protection circuit, a receiving out-of-band rejection filter, a low noise amplifier and a receiving AGC circuit; the power acquisition circuit comprises a bidirectional directional coupler, two groups of power detection circuits and a control circuit.
Preferably, the anti-interference band-pass filter is connected to the input end of the power acquisition circuit, and the input end of the anti-interference credit-pass filter is connected to a wireless port.
Preferably, the two sets of radio frequency switches are respectively connected to two ends of the receiving access circuit, an output end of one set of radio frequency switches is respectively connected to the channel module and the power amplifier/filter module, and an output end of the power amplifier/filter module is connected to an input end of the other set of radio frequency switches.
Preferably, the input end of the radio frequency switch of the other group is connected with the output end of the anti-interference band-pass filter, and the power sampling motor is connected in parallel between the radio frequency switch of the other group and the anti-interference band-pass filter.
Preferably, the output end of the other group of the radio frequency switches is respectively connected with the input end of the receiving out-of-band rejection filter and the input end of the receiving AGC circuit, and the amplitude limiting protection circuit is connected in parallel between the output end of the other group of the radio frequency switches and the input end of the receiving out-of-band rejection filter.
Preferably, the low noise amplifier is installed at the output end of the receiving out-of-band rejection filter, and the output end of the low noise amplifier is connected to the input ends of a group of the radio frequency switches.
The utility model also provides an anti-interference project organization based on radio station radio frequency front end, include former radio station part and radio frequency front end anti-interference module, a serial communication port, still include based on the anti-interference project organization of radio station radio frequency front end:
the bottom of the main board is provided with a connecting groove;
the bottom of the anti-interference module is mounted at the top of the mainboard;
the surface of the protective outer cover is arranged above the main board;
the surface of the heat dissipation column is movably arranged on the surface of the protective housing, and the top of the heat dissipation column is arranged on the protective housing;
and the connecting screw is arranged between the surface of the main board and the surface of the protective outer cover.
Preferably, the surface of the heat dissipation column is of an i-shaped structure, the surface of the heat dissipation column is abutted against the top of the anti-interference module, and the protective housing is provided with a vent hole.
Compared with the prior art, the utility model provides an anti-interference design structure has following beneficial effect based on radio station radio frequency front end:
the utility model provides an anti-interference project organization based on radio frequency front end of mobile radio station, the design of anti-interference filter circuit, the problem of noise suppression outside the band when solving transmission and receipt, it is low to have insertion loss simultaneously, the characteristics that power is high are born, receive the design of route circuit, the sensitivity that insertion loss that the solution anti-interference module introduced brought descends, the design has the linearity that the AGC circuit kept the channel simultaneously, power sampling circuit's design is opened short-circuit protection and is received the time large signal protect function when realizing anti-interference module transmission.
Drawings
Fig. 1 is a block diagram of an anti-interference rf front-end module system according to a first embodiment of the anti-interference design structure of the rf front-end of the vehicle-mounted radio station provided by the present invention;
fig. 2 is a schematic block diagram of an anti-interference filter based on an anti-interference design structure of a radio frequency front end of a vehicle-mounted radio station;
fig. 3 is a schematic block diagram of a receiving out-of-band rejection filter based on the anti-interference design structure of the radio frequency front end of the vehicle-mounted radio station;
fig. 4 is a schematic block diagram of a power sampling circuit based on an anti-interference design structure of a radio frequency front end of a vehicle-mounted radio station;
fig. 5 is a schematic view of a joint of a second embodiment of the anti-interference design structure based on the radio frequency front end of the vehicle-mounted radio station provided by the present invention;
fig. 6 is a cross-sectional view of the whole shown in fig. 5.
Reference numbers in the figures:
1. a main board 11 and a connecting groove;
2. an anti-interference module;
3. a shield case 31, a vent hole;
4. a heat-dissipating column;
5. and connecting screws.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and embodiments.
The first embodiment:
please refer to fig. 1, fig. 2, fig. 3 and fig. 4 in combination, wherein fig. 1 is a block diagram of an anti-interference rf front-end module system according to a first embodiment of an anti-interference design structure for a radio front-end of a vehicle radio station according to the present invention; fig. 2 is a schematic block diagram of an anti-interference filter based on an anti-interference design structure of a radio frequency front end of a vehicle-mounted radio station; fig. 3 is a schematic block diagram of a receiving out-of-band rejection filter based on the anti-interference design structure of the radio frequency front end of the vehicle-mounted radio station; fig. 4 is the utility model provides a power sampling circuit schematic block diagram based on anti-interference project organization of radio frequency front end of mobile radio station.
An anti-interference design structure based on a vehicle-mounted radio station radio frequency front end comprises a primary radio station part and a radio frequency front end anti-interference module arranged at the front end of the primary radio station part, wherein the primary radio station part comprises a channel module and a power amplifier/filter module;
the radio frequency front end anti-interference module comprises two groups of radio frequency switches, an anti-interference filter circuit, a receiving access circuit and a power sampling circuit:
the anti-interference filter circuit comprises an anti-interference band-pass filter with separated cavities;
the receiving path circuit comprises an amplitude limiting protection circuit, a receiving out-of-band rejection filter, a low noise amplifier and a receiving AGC circuit;
the power acquisition circuit comprises a bidirectional directional coupler, two groups of power detection circuits and a control circuit.
In a transmitting state, an anti-interference band-pass filter with isolation increased by cavity separation is used for improving the suppression degree of out-of-band transmission interference signals and avoiding interference with a receiving radio station;
when in a receiving state, the anti-interference band-pass filter filters out-of-band interference signals, and meanwhile, the receiving out-of-band rejection filter with better selectivity is added to further filter out-of-band interference signals, and meanwhile, a low noise amplifier and a related receiving AGC circuit are added for compensating insertion loss introduced by the filter;
the power sampling circuit is mainly used for protecting an antenna port and a large signal and avoiding damaging a transceiver.
The anti-interference band-pass filter is connected to the input end of the power acquisition circuit, and the input end of the anti-interference credit-pass filter is connected with a wireless port.
The anti-interference filter circuit improves the suppression degree of the out-of-band interference signal of the transmitting station, so that the amplitude of the out-of-band interference signal at the antenna port of the other receiving station is smaller than the sensitivity value of the out-of-band interference signal, and the anti-interference lending filter plays a role in suppressing the out-of-band interference including the main peak signal of the adjacent transmitting station during receiving;
the filter adopts a Butterworth filter consisting of a high-Q-value inductor and a capacitor, and has the characteristics of large bearing power, low insertion loss, good far-end suppression and the like.
The two groups of radio frequency switches are respectively connected with two ends of the receiving access circuit, the output end of one group of radio frequency switches is respectively connected with the channel module and the power amplifier/filter module, and the output end of the power amplifier/filter module is connected with the input end of the other group of radio frequency switches.
The input end of the radio frequency switch is connected with the output end of the anti-interference band-pass filter, and the power sampling motor is connected in parallel between the radio frequency switch and the anti-interference band-pass filter.
The output end of the other group of radio frequency switches is respectively connected with the input end of the receiving out-of-band rejection filter and the input end of the receiving AGC circuit, and the amplitude limiting protection circuit is connected in parallel between the output end of the other group of radio frequency switches and the input end of the receiving out-of-band rejection filter.
The low noise amplifier is arranged at the output end of the receiving out-of-band rejection filter, and the output end of the low noise amplifier is connected with the input ends of the radio frequency switches.
The low-noise amplifier compensates sensitivity reduction caused by the introduction of a radio frequency front end anti-interference module and comprises an amplitude limiting protection circuit, a receiving out-of-band rejection filter and a receiving AGC circuit;
the receiving out-of-band rejection filter has good cut-off characteristics, and further enhances the receiving anti-interference capability.
The power sampling circuit realizes the automatic gain control of the receiving state and the standing-wave ratio protection function of the transmitting state through the bidirectional directional coupler, the two groups of power detection circuits and the control circuit.
Design of the antijam filter circuit:
the anti-interference filter mainly functions to filter harmonic components during transmission and filter out-of-band interference signals during reception. The harmonic component received by the interference radio station 1 is far away from the working frequency of the radio station 2, so a filter with a gentle cut-off characteristic can be adopted, and the higher harmonic component is also restrained, the high-end restraining effect is not allowed to be weakened, and the high transmitting power has a strict requirement on the insertion loss, so a band-pass filter consisting of a Butterworth type low-pass filter and a high-pass filter is selected, and the Butterworth filter has the characteristics of simple structure, flattest response in a pass band, good attenuation characteristic and phase characteristic, moderate selectivity, moderate group delay characteristic, good tolerance on the difference of component quality and the like;
and (3) comprehensively considering the requirements of insertion loss and stop band attenuation indexes, and sampling a 7-order Butterworth low-pass filter and a 7-order Butterworth high-pass filter to form the anti-interference band-pass filter.
The antijam filter schematic is shown in fig. 2.
The capacitor of the band-pass filter adopts a high-power high-Q capacitor, and the inductor adopts a self-made hollow coil inductor and has a higher Q value;
actually measuring the insertion loss of the anti-interference filter: the loss of the working frequency of the radio station 2 is less than or equal to 0.35dB, and the suppression of the working frequency of the radio station 1 is more than or equal to 75.3 dB;
the design expectation is met, the harmonic suppression is more than 60dB of the required value, and the system design requirement is met.
Design of a receiving path circuit:
the receiving path circuit comprises an amplitude limiter, a receiving out-of-band rejection filter, a Low Noise Amplifier (LNA) and a receiving AGC circuit;
the amplitude limiter is mainly used for limiting the amplitude of the radio frequency input signal, protecting a post-stage circuit of the receiving circuit and avoiding a receiving part circuit from being burnt by a burst large signal;
the receiving out-of-band rejection filter is mainly used for filtering out-of-band interference signals of a near end during receiving and increasing and suppressing far-end interference signals;
the low noise amplifier is used for compensating the reduction of the receiving sensitivity caused by the insertion loss;
the receiving out-of-band rejection filter also adopts a band-pass filter, and the structure form is as follows: a low-pass filter + a high-pass filter;
because the near-end cut-off characteristic is required to be attenuated quickly, the far-end rejection characteristic is required to be common, and because the far-end rejection is mainly a high-power harmonic rejection filter to work, an elliptic function filter is adopted.
The elliptic function filter has fluctuation in the pass band, zero in the stop band, better cut-off characteristic than other filters, but strict requirements on devices, so that the capacitors and inductors forming the filter use high-Q-value devices.
And (4) comprehensively considering the insertion loss and the stop band attenuation index requirement, and determining to sample a 7 th-order elliptic function low-pass filter and a 7 th-order elliptic function high-pass filter.
A schematic block diagram of the receive out-of-band rejection filter is shown in fig. 3.
Actually measured reception out-of-band rejection filter insertion loss: the working frequency of the radio station 2 is less than or equal to 0.5dB, and the working frequency of the radio station 1 is more than or equal to 35.0 dB. And finally, the transmission main frequency rejection attenuation of the radio station 1 by the radio station 2 is larger than 100dB by combining the rejection characteristic of the anti-interference filter to the working frequency of the radio station 1.
Compared with simulation data, the design expectation is met, the near-end attenuation characteristic of the receiving out-of-band rejection filter is good, and the system design requirement is met.
Design of the power sampling circuit:
the actually measured insertion loss of the directional coupler is as follows: 0.15dB, coupling: 50dB, power capacity: 150W. Power detector frequency range: LF-2500MHz, detection range: > 30dB, maximum signal: less than or equal to 10 dBm. The directional coupler respectively couples out forward and reverse radio frequency power signals, and the signals are sent to a power detector after amplitude adjustment is carried out through a pi-type attenuation resistance network, the radio frequency power signals are converted into detection direct current levels representing the power of the signals, and the detection direct current levels are sent to a control circuit to carry out real-time forward and reverse power detection, so that the automatic gain control of a receiving state and the standing-wave ratio protection function of a transmitting state are realized.
A schematic block diagram of the power sampling circuit is shown in fig. 4.
The communication vehicle is provided with working frequency bands: 400MHz to 700MHz, emission power: 50W, sensitivity: -110dBm of stations 1; 30 MHz-90 MHz, emission power: 50W, sensitivity: station 2 at 116dBm, two station antennas installed at a distance: 0.8 m.
The actual measurement verifies that:
when the anti-interference radio frequency front-end module is not installed:
when the two radio stations are in a receiving state or a transmitting state at the same time, mutual interference does not exist; when the two radio stations are in a receiving and transmitting state, the maximum mutual interference exists, the receiving radio station can not work normally, and the received signal is blocked;
when installing anti-interference radio frequency front end module:
when the two radio stations are in an independent transceiving state, mutual interference does not exist; the sensitivity of the radio station is not reduced, and the index requirement is met.
The ultra-short wave anti-interference radio has been successfully applied to a certain ultra-short wave vehicle-mounted communication radio station, and meets the anti-interference requirements for loading in different frequency bands.
Fig. 1 shows a block diagram of an anti-interference rf front-end module system, which takes a radio station 2 as an example, and the specific design technical solution is as follows:
the radio frequency front end anti-interference module has the index requirements that:
1. the working frequency range is as follows: A-B MHz;
2. power capacity: not less than 50W;
3. transmission path insertion loss: less than or equal to 0.6 dB;
4. gain of a receiving path: not less than 6.0 dB;
5. the harmonic suppression is more than or equal to 60dB (in the working frequency range of the radio station 1).
When the radio station is in a receiving state, a useful receiving signal and a high-power interference signal enter a radio frequency front end anti-interference module from an antenna through an antenna port, the useful receiving signal enters an internal circuit through a high-power harmonic filter, meanwhile, an out-of-band interference signal is restrained to a certain extent, and then reverse power detection is carried out through a power sampling circuit;
when the reverse power detects that the input signal is a small signal, the FPGA control circuit controls the radio frequency switch to enable the radio frequency signal to enter a first receiving channel:
firstly, limiting the amplitude of a received signal through an amplitude limiter to avoid an instantaneous large signal from damaging a post-stage circuit;
then the received signal enters a receiving band-pass filter to further filter out-of-band interference signals, so that the anti-interference capability is improved;
the filtered signals enter a Low Noise Amplifier (LNA) for useful signal amplification, and finally the received signals enter a channel module through a radio frequency switch for subsequent processing;
when the reverse power detects that the input signal is a large signal, the control circuit controls the radio frequency switch to enable the radio frequency signal to enter a receiving AGC (automatic gain control) channel to attenuate the large signal, and the receiving AGC circuit is a pi-type resistance attenuation network consisting of power resistors;
when the reverse power detects that the input signal is increased to the point that the power resistor cannot bear, the FPGA control circuit controls the radio frequency switch to cut off all radio frequency channels, so that the internal circuit is prevented from being damaged;
the low noise amplifier added in the receiving channel compensates the filter insertion loss increased by improving the anti-interference capability of the system, and avoids the sensitivity reduction of the radio station.
When the radio station is in a transmitting state, an excitation signal sent by the channel module enters a radio frequency switch of the radio frequency front-end module and is switched to the power amplifier/filter module through the radio frequency switch, the radio frequency signal enters the radio frequency switch of the radio frequency front-end module again after being amplified and filtered, then sequentially passes through the power sampling circuit and the high-power harmonic filter, and finally, radio frequency power is transmitted through the antenna;
the forward and reverse power detection circuits simultaneously detect power and voltage standing wave ratio VSWR, when VSWR is larger than a set threshold value, the control circuit gives out a fault alarm signal of the standing wave ratio of the antenna port, and simultaneously reduces the power output level and avoids the power amplifier/filter module from being damaged by overlarge reflected power.
The radio frequency front end anti-interference module has the characteristics of strong anti-interference capability, small volume, large bearing power, convenience in additionally installing and upgrading original equipment, wide application range and the like;
the following problems are solved by additionally arranging a radio frequency front end anti-interference module:
the simultaneous working of the loading of different types of radio stations is mutually influenced;
the added module causes sensitivity reduction and influences communication effect;
the design can be optimized for a particular interfering frequency.
Compared with the prior art, the utility model provides an anti-interference design structure has following beneficial effect based on radio station radio frequency front end:
the design of the anti-interference filter circuit solves the problem of out-of-band noise suppression during transmission and reception, and has the characteristics of low insertion loss and high bearing power.
Second embodiment:
referring to fig. 5-6 of the second embodiment, the second embodiment of the present invention further provides another anti-interference design structure based on the radio frequency front end of the car radio.
In an optional mode of this embodiment, the anti-interference design structure based on the vehicle-mounted radio station radio frequency front end may include the original radio station part and the radio frequency front end anti-interference module.
Based on anti-interference project organization of vehicle radio station radio frequency front end still includes:
the bottom of the main board 1 is provided with a connecting groove 11;
the bottom of the anti-interference module 2 is arranged at the top of the mainboard 1;
the surface of the protective outer cover 3 is arranged above the main board 1;
the surface of the heat dissipation column 4 is movably arranged on the surface of the protective housing 3, and the top of the heat dissipation column 4;
and the connecting screw 5 is installed between the surface of the main board 1 and the surface of the protective outer cover 3.
The protection outer cover 3 is assembled on the mainboard 1 provided with the anti-interference module 2, so that the protection outer cover 3 is convenient to shield and protect circuits on the mainboard 1 on one hand, and provides scratch and rubbing resistance when the integral structure of the mainboard 1 is installed and disassembled on the other hand;
movable mounting has heat dissipation post 4 on the protection dustcoat 3, and heat dissipation post 4 adopts the heat conduction material, and after the installation of protection dustcoat 3, the bottom of heat dissipation post 4 can be stable with anti-interference module 2's top surface butt to the surface of heat dissipation post 4 upwards lifts for protection dustcoat 3, makes the surface of heat dissipation post 4 outwards expand, increases the contact with the outside air, makes things convenient for the supplementary heat dissipation of 2 partial operation in-process of anti-interference module.
The surface of the heat dissipation column 4 is of an I-shaped structure, the surface of the heat dissipation column 4 is abutted against the top of the anti-interference module 2, and the protective outer cover 3 is provided with a vent hole 31.
The heat-dissipating studs 4 of the same type ensure their stability during adjustment of the protective casing 3.
The ventilation holes 31 can secure the ventilation performance of the connection portion between the top surface of the main board 1 and the bottom surface of the shield case 3.
When in use, the bottom of the protective outer cover 3 is aligned to the top of the main board 1, and the protective outer cover 3 and the main board 1 are fixed after the connecting screw 5 is screwed down;
after the protective housing 3 is installed, the bottom of the heat dissipation column 4 is abutted against and in close contact with the top of the anti-interference module 2, so that heat dissipation of the anti-interference module 2 can be normal while protection is guaranteed.
In another optional manner of this embodiment, the anti-interference design structure based on the vehicle radio station front end may not include the original radio station part and the radio frequency front end anti-interference module. Based on the component that the anti-interference project organization of on-vehicle radio station radio frequency front end is constituteed, only need satisfy just sheltering from and protecting the circuit on the mainboard 1, make things convenient for simultaneously 2 partial operation in-process supplementary radiating effects of anti-interference module can.
Has the advantages that:
the protection housing 3, the protection housing 3 on the one hand conveniently shelters from and protects the circuit on the mainboard 1, and on the other hand provides the anti-scratch performance when the overall structure of mainboard 1 is installed and is dismantled, and when the surface of heat dissipation post 4 outwards expanded, increase the contact with the outside air, make things convenient for the supplementary heat dissipation of anti-interference module 2 part operation in-process.
The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes of the present invention are used in the specification and the attached drawings, or directly or indirectly applied to other related technical fields, and the same principle is included in the protection scope of the present invention.
Claims (8)
1. The utility model provides an anti-interference project organization based on vehicle radio station radio frequency front end, includes former radio station part and installs the anti-interference module of radio frequency front end at its front end, its characterized in that:
the original station part comprises a channel module and a power amplifier/filter module;
the radio frequency front end anti-interference module comprises two groups of radio frequency switches, an anti-interference filter circuit, a receiving access circuit and a power sampling circuit:
the anti-interference filter circuit comprises an anti-interference band-pass filter with separated cavities;
the receiving path circuit comprises an amplitude limiting protection circuit, a receiving out-of-band rejection filter, a low noise amplifier and a receiving AGC circuit;
the power acquisition circuit comprises a bidirectional directional coupler, two groups of power detection circuits and a control circuit.
2. The vehicle radio frequency front end based anti-interference design structure according to claim 1, wherein the anti-interference band-pass filter is connected to an input end of the power acquisition circuit, and an input end of the anti-interference credit-pass filter is connected to a wireless port.
3. The radio frequency front end anti-interference design structure based on the vehicle radio station as claimed in claim 1, wherein two sets of the radio frequency switches are respectively connected to two ends of the receiving path circuit, an output terminal of one set of the radio frequency switches is respectively connected to the channel module and the power amplifier/filter module, and an output terminal of the power amplifier/filter module is connected to an input terminal of the other set of the radio frequency switches.
4. The vehicle radio frequency front end based anti-interference design structure according to claim 3, wherein an input end of another group of the radio frequency switches is connected with an output end of the anti-interference band-pass filter, and the power sampling motor is connected in parallel between the other group of the radio frequency switches and the anti-interference band-pass filter.
5. The radio-frequency front-end anti-interference design structure based on the vehicle radio station as claimed in claim 3, wherein the output terminals of another group of the radio-frequency switches are respectively connected to the input terminal of the receiving out-of-band rejection filter and the input terminal of the receiving AGC circuit, and the amplitude-limiting protection circuit is connected in parallel between the output terminals of another group of the radio-frequency switches and the input terminal of the receiving out-of-band rejection filter.
6. The vehicle radio frequency front end based anti-jamming design according to claim 5, wherein the low noise amplifier is mounted at an output of the receive out-of-band rejection filter, and an output of the low noise amplifier is connected to an input of a set of the radio frequency switches.
7. An anti-interference design structure based on a vehicle radio station radio frequency front end, comprising the original radio station part and the radio frequency front end anti-interference module as claimed in claim 1, wherein the anti-interference design structure based on the vehicle radio station radio frequency front end further comprises:
the bottom of the main board is provided with a connecting groove;
the bottom of the anti-interference module is mounted at the top of the mainboard;
the surface of the protective outer cover is arranged above the main board;
the surface of the heat dissipation column is movably arranged on the surface of the protective housing, and the top of the heat dissipation column is arranged on the protective housing;
and the connecting screw is arranged between the surface of the main board and the surface of the protective outer cover.
8. The anti-jamming design structure based on the radio frequency front end of the vehicle radio station according to claim 7, wherein a surface of the heat dissipation pillar is of an i-shaped structure, and abuts against a top of the anti-jamming module, and a vent hole is formed in the protective housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123159239.8U CN216751729U (en) | 2021-12-15 | 2021-12-15 | Based on anti-interference project organization of vehicle radio station radio frequency front end |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123159239.8U CN216751729U (en) | 2021-12-15 | 2021-12-15 | Based on anti-interference project organization of vehicle radio station radio frequency front end |
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| CN216751729U true CN216751729U (en) | 2022-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123159239.8U Active CN216751729U (en) | 2021-12-15 | 2021-12-15 | Based on anti-interference project organization of vehicle radio station radio frequency front end |
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| Country | Link |
|---|---|
| CN (1) | CN216751729U (en) |
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2021
- 2021-12-15 CN CN202123159239.8U patent/CN216751729U/en active Active
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