CN111092623B - Large dynamic range electromagnetic signal long-distance transmission device - Google Patents
Large dynamic range electromagnetic signal long-distance transmission device Download PDFInfo
- Publication number
- CN111092623B CN111092623B CN201911354197.8A CN201911354197A CN111092623B CN 111092623 B CN111092623 B CN 111092623B CN 201911354197 A CN201911354197 A CN 201911354197A CN 111092623 B CN111092623 B CN 111092623B
- Authority
- CN
- China
- Prior art keywords
- capacitor
- inductor
- npn triode
- resistor
- preamplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1018—Means associated with receiver for limiting or suppressing noise or interference noise filters connected between the power supply and the receiver
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The embodiment of the invention provides a long-distance transmission device for electromagnetic signals with a large dynamic range, which comprises: the device comprises a preamplifier, a DC isolator, a shunt and a biaser; the preamplifier is used for amplifying useful signals received by the antenna and reducing the background noise of the system; the bias device is used for realizing the combination of direct current and signals and transmitting the direct current and the signals through a cable with the same axis; the biaser is also used for ensuring that direct current cannot enter the spectrum analyzer and providing high impedance for a direct current power supply end to ensure that signals are not injected into a direct current power supply input end; the shunt is used for separating a total path signal from direct current and providing high impedance to ensure that the signal cannot enter a power supply end of the preamplifier; and the DC isolator is used for ensuring that the DC cannot enter the signal input end of the preamplifier. The embodiment of the invention can accurately identify the tiny electromagnetic signals when the electromagnetic signals are transmitted and tested in a long distance.
Description
Technical Field
The invention relates to the technical field of communication electronics, in particular to a long-distance transmission device for electromagnetic signals with a large dynamic range.
Background
When the electromagnetic characteristics of large equipment such as an entire airplane are tested, in order to obtain good electromagnetic background noise, a place with a remote geographical position and relatively few peripheral power electronic facility equipment is generally selected under the condition that a full-electric dark room meeting the test conditions does not exist. In the traditional test method, a radio frequency signal received by an antenna is transmitted to test equipment through a coaxial low-loss cable, and then a series of transformation is carried out by utilizing a signal processing technology, so that the monitoring from a time domain signal to a frequency domain signal is realized. However, the conventional method has the disadvantages of large signal transmission loss, low transmission resolution, poor reliability, and the like. With the development of modern communication technology, radio frequency signals are transmitted in a long distance, and the working machine room is withdrawn from a remote area to a living convenient area, so that radio monitoring personnel obtain more convenient working and living conditions, and the development trend is formed, and optical fiber communication is generally used. The technology has the advantages of low transmission loss, wide transmission frequency band, strong anti-interference capability and the like, and is particularly suitable for long-term large-scale engineering projects. However, as a laboratory test method for scientific research, especially when the laboratory test method has a requirement for high-altitude operation, the method has the disadvantages of difficult power supply of a signal receiving end and high investment cost.
Taking fig. 1 as an example, in order to perform the performance test of the onboard antenna, it is necessary to set up a height requirement for the whole machine to eliminate the influence of the ground reflection on the test result, which is generally at least 10 meters. When the test antenna is used for receiving, the test antenna meets the electromagnetic wave far field condition, particularly, the test antenna is spaced from the aircraft antenna by more than 50 meters at a V/U wave band frequency, the whole machine erection height is combined, and then the receiving antenna is at least required to be lifted to a position 60 meters above the ground when a pitching direction test is carried out. The problem is usually solved by adding a preamplifier at the rear end of the antenna in the industry, but the problem of high-altitude power supply of the preamplifier becomes a troublesome problem. The problem of overweight bearing of high-altitude bearing objects can be caused by adopting a battery for power supply; the power supply is matched with a special wire to be transmitted to the preamplifier, so that the wire and the radio frequency cable form a twisted fabric in the air, serious safety risks exist, and extra load is formed.
For the problem, as the test is mainly used for the performance research and test of the whole military aircraft/civil aircraft or the superstructure of a ship, the related test standards do not have an exemplary standard test configuration at present, and a set of feasible test method for solving the actual difficulty in the high-altitude electromagnetic characteristic test has not been popularized in the industry.
Disclosure of Invention
The invention aims to provide a long-distance transmission device for electromagnetic signals with a large dynamic range, which can improve the dynamic range and the signal-to-noise ratio of a test under the condition of ensuring the safety of testers and equipment, simultaneously use a coaxial cable for transmitting radio-frequency signals to transmit low-power direct-current electric energy, solve the difficulty of bearing limitation of high-altitude bearing equipment, ensure effective signal and power isolation and provide safe and continuous work guarantee for a whole set of test system. And a simple and quick equipment connection configuration method is provided for field testers.
The embodiment of the invention provides a long-distance transmission device for electromagnetic signals with a large dynamic range, which comprises: the device comprises a preamplifier, a DC isolator, a shunt and a biaser; the preamplifier is connected with a DC isolator, the DC isolator is connected with the shunt, the shunt is connected with the biaser, the biaser is connected with a DC power supply, the biaser is connected with a spectrum analyzer, wherein,
the preamplifier is used for amplifying useful radio frequency signals received by the antenna and reducing the background noise of the system;
the bias device is used for realizing the combination of direct current and radio frequency signals and transmitting the direct current and the radio frequency signals through the same-axis cable; the biaser is also used for ensuring that direct current cannot enter the spectrum analyzer and providing high impedance for a power supply end to ensure that radio frequency signals are not injected into the power supply input end;
the shunt is used for separating the radio-frequency signal of the total path from the direct current and providing high impedance to ensure that the radio-frequency signal does not enter the power supply end of the preamplifier;
and the DC isolator is used for ensuring that the DC cannot enter the signal input end of the preamplifier.
Further, the preamplifier includes:
a first NPN triode, a second NPN triode and a third NPN triode;
the base electrode of the first NPN triode is a signal input end;
the emitting set of the first NPN triode is connected with the base electrode of the second NPN triode;
the emission set of the second NPN triode is connected with the base electrode of the third NPN triode;
and the collector electrode of the first NPN triode, the collector electrode of the second NPN triode and the collector electrode of the third NPN triode are connected with each other.
Further, the dc block comprises a seventh capacitor.
Further, the splitter comprises:
the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the first inductor, the second inductor, the third inductor, the fifth inductor and the sixth inductor;
the seventh capacitor, the third capacitor, the fourth capacitor and the fifth capacitor are sequentially connected in series;
the first inductor, the second inductor and the third inductor are sequentially connected in series; the seventh capacitor, the third capacitor, the fourth capacitor and the fifth capacitor which are connected in series are connected with the first inductor, the second inductor and the third inductor which are connected in series in parallel; one end of the first inductor is connected with a collector of a third NPN triode; one end of the seventh capacitor is connected with an emitting electrode of the third NPN triode;
the fifth inductor and the sixth inductor are connected in parallel; one end of the fifth inductor is connected with one end of the fourth capacitor, and one end of the sixth inductor is connected with the other end of the fourth capacitor; the other end of the fifth inductor and the other end of the sixth inductor are both grounded;
the first capacitor and the second capacitor are connected in parallel; one end of the first capacitor is connected with one end of the second inductor, and one end of the second capacitor is connected with the other end of the second inductor; the other end of the first capacitor and the other end of the second capacitor are both grounded.
Further, the biaser includes: a seventh inductor and a sixth capacitor; one end of the seventh inductor and one end of the sixth capacitor are both connected to an intersection point of the fifth capacitor and the third inductor, and the other end of the sixth capacitor is a signal output end.
Further, the positive pole of the power supply is connected to the other end of the seventh inductor, and the negative pole of the power supply is grounded.
Further, the preamplifier employs a common emitter circuit with negative feedback, including:
the first NPN triode, the second NPN triode, the third NPN triode, the first resistor, the second resistor, the third resistor, the fourth resistor and the fifth resistor are connected in series;
one end of the first resistor and one end of the second resistor are connected with the base electrode of the first NPN triode;
the other end of the second resistor, one end of the third resistor, one end of the fourth resistor and one end of the fifth resistor are connected with each other;
the other end of the third resistor, the collector of the first NPN triode and the base of the second NPN triode are mutually connected;
the other end of the fourth resistor, the collector of the second NPN triode and the base of the third NPN triode are mutually connected;
the other end of the fifth resistor is connected with a collector of a third NPN triode;
the collector of the first NPN triode is connected with the collector of the second NPN triode;
the collector electrode of the third NPN triode is connected to the collector electrode of the second NPN triode through a bypass capacitor; the input end is connected to a loop of the base electrode of the first NPN triode and the emitter electrode of the first NPN triode.
According to the embodiment of the invention, through the combination of the preamplifier, the biaser and the shunt, a system design idea that the direct current bias voltage and the alternating current signal (radio frequency signal) are fused and then reach a far end for separation again is adopted, and meanwhile, the signal receiving dynamic range of the electromagnetic characteristic test is greatly improved on the premise that a few low-cost test equipment is added by combining the DC blocking device and the feed-through capacitor in the biaser to safely and effectively protect the signal ends of the preamplifier and the input end of the spectrum analyzer of the input end and the output end of the alternating current signal respectively, so that the experimental arrangement difficulty and the personnel requirement of field testers are greatly reduced, and the problem that the preamplifier is difficult to supply power during long-distance electromagnetic characteristic test is solved. Furthermore, the method is simple. The direct current and the radio frequency signals are transmitted through the cable with the same axis, so that the cable can be simplified, the simplified cable, the battery and other devices provide larger space for selection of bearing equipment, the total test cost is effectively reduced, and a practical and effective solution is provided for ensuring long-distance electromagnetic signal transmission test.
Drawings
FIG. 1 is a high altitude rig test rendering;
FIG. 2 is a diagram of a specific test configuration and signal flow for a long-distance transmission device for electromagnetic signals with a large dynamic range according to an embodiment of the present invention;
fig. 3 is a schematic signal downlink transmission diagram of a long-distance electromagnetic signal transmission apparatus with a large dynamic range according to an embodiment of the present invention;
fig. 4 is a schematic power down-link diagram of a long-distance electromagnetic signal transmission apparatus with a large dynamic range according to an embodiment of the present invention;
FIG. 5 is a circuit diagram of a preamplifier provided by an embodiment of the invention;
FIG. 6 is a circuit diagram of a preamplifier provided in a preferred embodiment;
FIG. 7 is a schematic diagram of a biaser provided in accordance with an embodiment of the present invention;
fig. 8 is a schematic diagram of a splitter according to an embodiment of the present invention;
fig. 9 is a circuit diagram of an alternative preferred embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
When the electromagnetic characteristics of large-scale equipment such as an entire airplane and the like are tested, the traditional test method finally tests the background noise (P)Noise) Generally, the system comprises three parts, namely transmission cable loss, a Display Average Noise Level (DANL) of a spectrum analyzer, and a Resolution Bandwidth (RBW). Under the condition that the background noise of the spectrum analyzer is guaranteed to be the lowest (when the temperature is 27 ℃ at room temperature and about 290K, 50 ohms of the input end of the spectrum analyzer are matched with a load), the DANL-174 dBm under the condition that RBW is 1Hz can be obtained through a thermal noise calculation formula, and the value is the theoretical minimum value of the DANL at normal temperature. The transmission cable loss can be viewed as an ideal transmission line plus attenuator, directly affecting the resulting DANL. And the RBW of the receiving device also affects the final value of the test noise floor. Here we give the test floor noise (P)Noise) The calculation formula of (2).
Wherein:
IL represents line attenuation and may include cables, attenuators, and the like
NF represents noise figure
It can be seen that P is the same when the cable is 60 meters, 1dB/m attenuation is achieved, and RBW is 10kHzNoiseIn fact, the DANL of the spectrometer with the known brand is about-150 dBm, and the interference conditions such as NF increase caused by outfield high temperature weather are not calculated. This conventional approach is difficult to implement when far field conditions cause the transmission signal to be attenuated to below-50 dBm at the antenna port.
The invention aims to improve the DANL by using the micro-miniature preamplifier, improve the test dynamic range and the signal to noise ratio, simultaneously use the coaxial cable for transmitting the radio frequency signal to transmit low-power direct current electric energy, solve the difficulty that the bearing of high-altitude bearing equipment is limited, ensure effective signal and power isolation and provide safe and continuous work guarantee for the whole set of test system. The simple and fast equipment connection configuration method is provided for field testers, is simple and efficient, and is convenient for troubleshooting when abnormal testing occurs.
Referring to fig. 2, an embodiment of the invention provides a long-distance transmission device for electromagnetic signals with a large dynamic range, including: the device comprises a preamplifier, a DC isolator, a shunt and a biaser; the preamplifier is connected with a DC isolator, the DC isolator is connected with the shunt, the shunt is connected with the biaser, the biaser is connected with a DC power supply, and the biaser is connected with a spectrum analyzer; wherein the content of the first and second substances,
the preamplifier is used for amplifying useful radio frequency signals received by the antenna and reducing the background noise of the system;
the bias device is used for realizing the combination of direct current and radio frequency signals and transmitting the direct current and the radio frequency signals through the same-axis cable; the biaser is also used for ensuring that direct current cannot enter the spectrum analyzer and providing high impedance for a power supply end to ensure that radio frequency signals are not injected into the power supply input end;
the shunt is used for separating the radio-frequency signal of the total path from the direct current and providing high impedance to ensure that the radio-frequency signal does not enter the power supply end of the preamplifier;
and the DC isolator is used for ensuring that the DC cannot enter the signal input end of the preamplifier.
Specifically, please refer to fig. 3, fig. 3 is a schematic diagram of signal downlink transmission;
when the signal is transmitted in a downlink mode, the antenna receives electromagnetic signals of corresponding frequency bands and transmits the electromagnetic signals to the preamplifier; because the preamplifier is internally provided with a low-noise amplifying circuit, the background noise of the low-noise amplifying circuit is smaller than that of the DANL of the spectrum analyzer, when the preamplifier amplifies the useful signal and the background noise simultaneously, the background noise is still not higher than that of the DANL, and only the useful signal is amplified. The DC isolator has selectivity on transmission signals, only allows signals in a pass band to pass through, and mainly plays a role in isolating direct current from the signals. The biaser combines direct current and signals, and the output end can realize the output of the same cable and finally transmits the signals to the spectrum analyzer.
Referring to fig. 4, in the power up transmission, the preamplifier is preferably selected to be 9V to 12V, and the portable dc power supply is used to supply power. The DC port and the radio frequency signal are converged to a main path through the biaser for long-distance transmission, and the direct current electric energy is transmitted upwards, the radio frequency signal is transmitted downwards, and then the direct current electric energy and the radio frequency signal are separated through the shunt isolation port.
In the embodiment of the present invention, the preamplifier is also called a low noise amplifier, and the preamplifier is a small signal amplifier which is most commonly used,
as shown in fig. 5, the preamplifier includes:
a first NPN transistor Q1, a second NPN transistor Q2, and a third NPN transistor Q3;
the base electrode of the first NPN triode Q1 is a signal input end;
the emission set of the first NPN triode Q1 is connected with the base of the second NPN triode Q2;
the emission set of the second NPN triode Q2 is connected with the base of the third NPN triode Q3;
a collector of the first NPN transistor Q1, a collector of the second NPN transistor Q2, and a collector of the third NPN transistor Q3 are connected to each other.
The low noise amplifier is provided in the first stage of the high frequency circuit to improve the overall noise figure of the receiver, while the high frequency amplifier prevents the local oscillator signal from radiating out of the antenna path. The output signal of the antenna is fed to a low noise amplifier for amplification. The amplifier is a common emitter circuit and is also a broadband amplifier which is used for amplifying weak radio frequency signals and compensating insertion loss caused by cables. The triode in the high-frequency amplifier is required to have high cut-off frequency, large amplification factor and small noise coefficient. The first stage signal is small and the operating point is usually set low, and current negative feedback can be added to reduce noise.
In one preferred embodiment, the preamplifier is designed with a common emitter circuit with negative feedback. Specifically, as shown in fig. 6, the method includes:
a first NPN transistor Q4, a second NPN transistor Q5, a third NPN transistor Q6, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5;
one end of the first resistor R1 and one end of the second resistor R2 are connected with the base of the first NPN triode Q4;
the other end of the second resistor R2, one end of the third resistor R3, one end of the fourth resistor R4 and one end of the fifth resistor R5 are connected to each other;
the other end of the third resistor R3, the collector of the first NPN triode Q4 and the base of the second NPN triode Q5 are connected with each other;
the other end of the fourth resistor R4, the collector of the second NPN triode Q5 and the base of the third NPN triode Q6 are connected with each other;
the other end of the fifth resistor R5 is connected with the collector of a third NPN triode Q6;
the collector of the first NPN triode Q4 is connected with the collector of the second NPN triode Q5;
the collector of the third NPN transistor Q6 is connected to the collector of the second NPN transistor Q5 through a bypass capacitor C13; the input end is connected to the loop of the base electrode of the first NPN triode Q4 and the emitter electrode of the first NPN triode Q4.
The bypass capacitor C13 of the emitter of the third stage is used to improve the gain of the amplifier, which reduces the negative feedback effect on the signal. The DC operating point of the common emitter of the first stage is determined by a resistor R3; the second stage direct current working point is determined by a resistor R4 and is the feedback bias of a collector; the effect of resistor R5 determines the final output of the overall amplification circuit.
In practice, the first NPN transistor Q4, the second NPN transistor Q5, and the third NPN transistor Q6 are a broadband high frequency small signal amplifier.
The NPN triode is recommended to be selected from S9018, and has the characteristics of good temperature stability, wide input current range, high voltage gain (nearly 100 times) and the like.
The biaser is a three-port network device as shown in fig. 7, and the three ports are a radio frequency port RF, a direct current bias port DC, and a radio frequency direct current port RF & DC, respectively. The DC bias DC port of the bias device consists of a feed inductor and is used for adding DC bias, the characteristic that the inductor presents high impedance to an alternating current high-frequency signal is utilized, the alternating current signal of the RF port is prevented from leaking to a power supply system, and under an ideal condition, the direct current cannot cause any influence on a radio frequency end signal; the RF port consists of a DC blocking feed-through capacitor and is used for inputting radio frequency signals in a pass band range and simultaneously blocking the DC voltage of the bias port; the RF & DC port is connected to the main transmission path and can simultaneously transmit to a DC bias voltage and a radio frequency signal. If the internal devices of the biaser select ultra-wideband, near-ideal high-frequency inductors and capacitors without resonance points, the performance of the biaser is greatly improved.
The biaser selects mature products in the market as much as possible, such as U.S. mini-circuits, Changzhou Yicike and the like, and important indexes are bias voltage and current of a DC end, isolation between the RF end and the DC end, RF bandwidth, group delay, insertion loss, return loss and the like. The larger the value of the DC terminal bias current, the better the index. When the actual current exceeds the upper limit of the bias current, the inductance of the DC port is in current saturation. The performance of the biaser is affected in this state, and the device may be damaged due to excessive current, so that the biaser cannot work normally, and therefore the target must be larger than the rated current of the preamplifier. Isolation refers to the ability of the inductor to block the RF signal at the RF port from flowing to the DC port, and is typically expressed in dB. Theoretically, the larger the isolation, the better. If the isolation index of a certain biaser is poor, a radio frequency signal leaks into a power supply system, which may affect the performance of the power supply, and generally more than 20dB is recommended.
As shown in fig. 8, the splitter is a multi-port network device, and each port corresponds to an ac signal of a different frequency band. Each port of the shunt is composed of an LC network composed of capacitors and inductors so as to obtain different passband bandwidths. The embodiment of the invention adopts a three-port shunt for separating direct current bias from alternating current signals, the alternating current signal end adopts a mode that a main path is connected with a capacitor in series as much as possible, and the direct current bias is isolated by utilizing the characteristics of alternating current passing and direct current blocking of the capacitor; the DC offset end proposes to adopt a form that a main path is serially connected with an inductor, and utilizes the characteristic that the inductor does not influence DC to realize lossless passing on DC offset.
The inductor and the capacitor in the shunt are selected after being calculated through the LC resonance circuit according to a test passband frequency band, and the shunt is designed in a PCB single board mode, and can also be directly purchased from mature products of famous factories such as Japan village and the like. The indexes such as pass band frequency band, in-band loss, isolation degree and maximum input power are mainly concerned to meet the test requirements. It is noted that the main transmission path cannot contain a capacitor for circuit selection for dc bias separation.
The direct current power supply can select domestic famous brands such as Beijing Dahua, Xian Aike Saibo and the like, and the working reliability of continuous power-on in the test is ensured.
According to the embodiment of the invention, through the combination of the preamplifier, the biaser and the shunt, a system design idea that the direct current bias voltage and the alternating current signal (radio frequency signal) are fused and then reach a far end for separation again is adopted, and meanwhile, the signal receiving dynamic range of the electromagnetic characteristic test is greatly improved on the premise that a few low-cost test equipment is added by combining the DC blocking device and the feed-through capacitor in the biaser to safely and effectively protect the signal ends of the preamplifier and the input end of the spectrum analyzer of the input end and the output end of the alternating current signal respectively, so that the experimental arrangement difficulty and the personnel requirement of field testers are greatly reduced, and the problem that the preamplifier is difficult to supply power during long-distance electromagnetic characteristic test is solved. Furthermore, the method is simple. The direct current and the radio frequency signals are transmitted through the cable on the same shaft, so that the total number of transmission cables is reduced, and the risk of accidents caused by mutual interweaving of the transmission cables is avoided; the simplified devices such as cables and batteries provide larger space for selection of bearing equipment, effectively reduce the total test cost, and provide a practical and effective solution for ensuring long-distance electromagnetic signal transmission test
FIG. 9 is a schematic circuit diagram of one embodiment of the present invention including a preamplifier, a dc block, a shunt, and a biaser; the preamplifier is connected with a DC isolator, the DC isolator is connected with the shunt, the shunt is connected with the bias device, the bias device is connected with a DC power supply, and the like
The preamplifier includes:
a first NPN transistor Q1, a second NPN transistor Q2, and a third NPN transistor Q3;
the base electrode of the first NPN triode Q1 is a signal input end J1;
the emission set of the first NPN triode Q1 is connected with the base of the second NPN triode Q2;
the emission set of the second NPN triode Q2 is connected with the base of the third NPN triode Q3;
a collector of the first NPN transistor Q1, a collector of the second NPN transistor Q2, and a collector of the third NPN transistor Q3 are connected to each other.
The dc-block comprises a seventh capacitance C7.
The splitter includes:
a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first inductor L1, a second inductor L2, a third inductor L3, a fifth inductor L5 and a sixth inductor L6;
the seventh capacitor C7, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 are sequentially connected in series;
the first inductor L1, the second inductor L2 and the third inductor L3 are sequentially connected in series; the seventh capacitor C7, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 which are connected in series are connected in parallel with the first inductor L1, the second inductor L2 and the third inductor L3 which are connected in series; one end of the first inductor L1 is connected with the collector of a third NPN triode Q3; one end of the seventh capacitor C7 is connected with the emitter of the third NPN triode Q3;
the fifth inductor L5 and the sixth inductor L6 are connected in parallel; one end of the fifth inductor L5 is connected to one end of a fourth capacitor C4, and one end of the sixth inductor L6 is connected to the other end of the fourth capacitor; the other end of the fifth inductor L5 and the other end of the sixth inductor L6 are both grounded;
the first capacitor C1 and the second capacitor C2 are connected in parallel; one end of the first capacitor C1 is connected to one end of the second inductor L2, and one end of the second capacitor C2 is connected to the other end of the second inductor L2; the other end of the first capacitor C1 and the other end of the second capacitor C2 are both grounded.
The biaser includes: a seventh inductor L7 and a sixth capacitor C6; one end of the seventh inductor L7 and one end of the sixth capacitor C6 are both connected to an intersection point of the fifth capacitor C5 and the third inductor L3, and the other end of the sixth capacitor C6 is a signal output terminal J2.
The positive pole of the power supply is connected to the other end of the seventh inductor L7, and the negative pole of the power supply is grounded.
The internal components of the invention mostly adopt analog components and passive components, and are powered by a common portable switching power supply, so that the use of active components is reduced as much as possible, the influence of the system on electromagnetic characteristic test is reduced, and the excellence of the function and performance of the system is ensured.
The invention has low power consumption of internal devices, simple circuit and selectable mature products in the market for part of devices.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (7)
1. A large dynamic range long range electromagnetic signal transmission apparatus, comprising: the device comprises a preamplifier, a DC isolator, a shunt and a biaser; the preamplifier is connected with a DC isolator, the DC isolator is connected with the shunt, the shunt is connected with the biaser, the biaser is connected with a DC power supply, the biaser is connected with a spectrum analyzer, wherein,
the preamplifier is used for amplifying useful radio frequency signals received by the antenna and reducing the background noise of the system;
the bias device is used for realizing the combination of direct current and radio frequency signals and transmitting the direct current and the radio frequency signals through the same-axis cable; the biaser is also used for ensuring that direct current cannot enter the spectrum analyzer and providing high impedance for a power supply end to ensure that radio frequency signals are not injected into the power supply input end;
the shunt is used for separating the radio-frequency signal of the total path from the direct current and providing high impedance to ensure that the radio-frequency signal does not enter the power supply end of the preamplifier;
and the DC isolator is used for ensuring that the DC cannot enter the signal input end of the preamplifier.
2. The large dynamic range electromagnetic signal long distance transmission device of claim 1, wherein said preamplifier comprises:
a first NPN triode, a second NPN triode and a third NPN triode;
the base electrode of the first NPN triode is a signal input end;
the emitting set of the first NPN triode is connected with the base electrode of the second NPN triode;
the emission set of the second NPN triode is connected with the base electrode of the third NPN triode;
and the collector electrode of the first NPN triode, the collector electrode of the second NPN triode and the collector electrode of the third NPN triode are connected with each other.
3. The large dynamic range electromagnetic signal long distance transmission device of claim 2, wherein said dc-stop comprises a seventh capacitance.
4. The large dynamic range electromagnetic signal long distance transmission device of claim 3, wherein said splitter comprises:
the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the first inductor, the second inductor, the third inductor, the fifth inductor and the sixth inductor;
the seventh capacitor, the third capacitor, the fourth capacitor and the fifth capacitor are sequentially connected in series;
the first inductor, the second inductor and the third inductor are sequentially connected in series; the seventh capacitor, the third capacitor, the fourth capacitor and the fifth capacitor which are connected in series are connected with the first inductor, the second inductor and the third inductor which are connected in series in parallel; one end of the first inductor is connected with a collector of a third NPN triode; one end of the seventh capacitor is connected with an emitting electrode of the third NPN triode;
the fifth inductor and the sixth inductor are connected in parallel; one end of the fifth inductor is connected with one end of the fourth capacitor, and one end of the sixth inductor is connected with the other end of the fourth capacitor; the other end of the fifth inductor and the other end of the sixth inductor are both grounded;
the first capacitor and the second capacitor are connected in parallel; one end of the first capacitor is connected with one end of the second inductor, and one end of the second capacitor is connected with the other end of the second inductor; the other end of the first capacitor and the other end of the second capacitor are both grounded.
5. The large dynamic range electromagnetic signal long distance transmission device of claim 4, wherein said biaser comprises: a seventh inductor and a sixth capacitor; one end of the seventh inductor and one end of the sixth capacitor are both connected to an intersection point of the fifth capacitor and the third inductor, and the other end of the sixth capacitor is a signal output end.
6. The large dynamic range electromagnetic signal long distance transmission device of claim 5, wherein the positive pole of the power supply is connected to the other end of the seventh inductor, and the negative pole of the power supply is grounded.
7. The large dynamic range electromagnetic signal long distance transmission apparatus of claim 1, wherein said preamplifier employs a common emitter circuit with negative feedback, comprising:
the first NPN triode, the second NPN triode, the third NPN triode, the first resistor, the second resistor, the third resistor, the fourth resistor and the fifth resistor are connected in series;
one end of the first resistor and one end of the second resistor are connected with the base electrode of the first NPN triode;
the other end of the second resistor, one end of the third resistor, one end of the fourth resistor and one end of the fifth resistor are connected with each other;
the other end of the third resistor, the collector of the first NPN triode and the base of the second NPN triode are mutually connected;
the other end of the fourth resistor, the collector of the second NPN triode and the base of the third NPN triode are mutually connected;
the other end of the fifth resistor is connected with a collector of a third NPN triode;
the collector of the first NPN triode is connected with the collector of the second NPN triode;
the collector electrode of the third NPN triode is connected to the collector electrode of the second NPN triode through a bypass capacitor; the input end is connected to a loop of the base electrode of the first NPN triode and the emitter electrode of the first NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911354197.8A CN111092623B (en) | 2019-12-24 | 2019-12-24 | Large dynamic range electromagnetic signal long-distance transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911354197.8A CN111092623B (en) | 2019-12-24 | 2019-12-24 | Large dynamic range electromagnetic signal long-distance transmission device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111092623A CN111092623A (en) | 2020-05-01 |
| CN111092623B true CN111092623B (en) | 2021-06-29 |
Family
ID=70397194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911354197.8A Active CN111092623B (en) | 2019-12-24 | 2019-12-24 | Large dynamic range electromagnetic signal long-distance transmission device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111092623B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203933548U (en) * | 2014-05-20 | 2014-11-05 | 江苏博纳雨田通信电子有限公司 | Adopt micro-band monolithic integrated power amplifier chip of mixer along separate routes on sheet |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009095331A1 (en) * | 2008-01-29 | 2009-08-06 | Audioasics A/S | Signal conditioner with suppression of interfering signals |
| WO2015126675A1 (en) * | 2014-02-21 | 2015-08-27 | Andrew Llc | Input selective smart bias tee |
| US10644801B2 (en) * | 2016-06-30 | 2020-05-05 | Arizona Board Of Regents On Behalf Of The University Of Arizona | Proactive channel probing for wavelength switching in optical transmission systems |
| CN206040915U (en) * | 2016-09-14 | 2017-03-22 | 南京国睿安泰信科技股份有限公司 | Microwave channel selector auto -change over device based on biasing ware and separate straight ware |
| KR20180075048A (en) * | 2016-12-26 | 2018-07-04 | (주)시스다인 | Measure system and measure method of antenna factor |
| US10116264B1 (en) * | 2017-05-31 | 2018-10-30 | Corning Optical Communications Wireless Ltd | Calibrating a power amplifier such as in a remote unit in a wireless distribution system (WDS) |
| CN107768970A (en) * | 2017-09-19 | 2018-03-06 | 中国科学院上海微系统与信息技术研究所 | A kind of pulse mode Terahertz quantum cascaded laser radio-frequency modulations system and method |
-
2019
- 2019-12-24 CN CN201911354197.8A patent/CN111092623B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203933548U (en) * | 2014-05-20 | 2014-11-05 | 江苏博纳雨田通信电子有限公司 | Adopt micro-band monolithic integrated power amplifier chip of mixer along separate routes on sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111092623A (en) | 2020-05-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2017197954A1 (en) | Low-noise power amplifier used for satellite navigation and time service, and method for use | |
| CN103986417B (en) | Zero frequency amplitude suppression circuit with automatic detection and control as well as method thereof | |
| CN104333334A (en) | Broadband and low-noise radio frequency amplifier of satellite navigation aviation enhancing system and transmission device | |
| CN102013897A (en) | Aim satellite and data receiving circuit for satellite communication receiver | |
| CN110504930A (en) | Power amplifier device | |
| CN101793949B (en) | X-nuclear channel broadband pre-amplifier of high-field nuclear magnetic resonance spectrometer | |
| CN111092623B (en) | Large dynamic range electromagnetic signal long-distance transmission device | |
| CN111884725B (en) | Multipurpose broadband intelligent radio frequency photoelectric integrated transmitting and receiving assembly | |
| CN109327239A (en) | A kind of built-in base station duplex module with standing wave monitoring function low noise | |
| CN103501204B (en) | A kind of X-band power output telemetry-acquisition device | |
| CN109150228B (en) | Amplitude limiting amplification and output signal monitoring control module | |
| CN201540363U (en) | 1H/19F channel preamplifier of high-field nuclear magnetic resonance spectrometer | |
| CN211453937U (en) | Radar in-situ detection system | |
| CN107153140A (en) | A kind of protection circuit suitable for Noise Factor Analyzer receiver rf front-end | |
| CN212572567U (en) | Multipurpose broadband intelligent radio frequency photoelectric integrated transmitting and receiving assembly | |
| CN115911893B (en) | Radio astronomical normal temperature L wave band dual polarization receiver | |
| CN207939478U (en) | One kind exactly matching formula amplitude limit low-noise amplifier | |
| CN101726713A (en) | Preamplifier of high-field nuclear magnetic resonance spectrometer 1H/19F channel | |
| CN219122317U (en) | Radio frequency device detection system | |
| CN101090290A (en) | Plough time service integral receive antenna | |
| CN201611389U (en) | X nuclear channel wide-band preamplifier of high-field nuclear magnetic resonance spectrometer | |
| CN212811657U (en) | Radio frequency switch and filter combined structure | |
| CN213521857U (en) | Transmitting excitation system | |
| CN215581072U (en) | Power amplifier final-stage power amplification module | |
| Xu et al. | Study on Continuous Wave Electromagnetic Interference Effect of UAV Data Link |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 710075 floor 1, 2 and 3, complex building, No.9 zaozitai Road, new industrial park, high tech Zone, Xi'an City, Shaanxi Province Patentee after: GRG METROLOGY & TEST (XI'AN) CO.,LTD. Patentee after: Radio and TV Measurement and Testing Group Co.,Ltd. Address before: 710075 floor 1, 2 and 3, complex building, No.9 zaozitai Road, new industrial park, high tech Zone, Xi'an City, Shaanxi Province Patentee before: GRG METROLOGY & TEST (XI'AN) CO.,LTD. Patentee before: GUANGZHOU GRG METROLOGY & TEST Co.,Ltd. |