CN115189706A - Method for realizing active small magnetic antenna based on loranC very low frequency signal - Google Patents
Method for realizing active small magnetic antenna based on loranC very low frequency signal Download PDFInfo
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- CN115189706A CN115189706A CN202210829054.3A CN202210829054A CN115189706A CN 115189706 A CN115189706 A CN 115189706A CN 202210829054 A CN202210829054 A CN 202210829054A CN 115189706 A CN115189706 A CN 115189706A
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- 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
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45475—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using IC blocks as the active amplifying circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
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- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
The invention discloses a method for realizing an active small magnetic antenna based on loranC very low frequency signals, which particularly relates to the technical field of magnetic antennas and specifically comprises the following steps: s1: establishing a receiving front end; s2: frequency selection; s3: differential amplification; s4: and (5) signal amplification. The invention uses the mode of differential winding as the access end of the antenna, amplifies the signal by the differential mode, and finally obtains a loranC very low frequency signal, therefore, the mode has small requirement on the size of the antenna, the size can achieve the length of 120mm multiplied by the width of 120mm multiplied by the height of 5mm, and the requirement of miniaturization is facilitated.
Description
Technical Field
The invention relates to the technical field of magnetic antennas, in particular to a method for realizing an active small magnetic antenna based on loranC very low frequency signals.
Background
The magnetic antenna is formed by winding two groups of coils which are not connected with each other on a magnetic rod and is used for receiving electromagnetic waves in space. The magnetic antenna has good directivity, so that when the radio rotates in a certain direction, the sound is loudest, and the noise is reduced. It features that the loaded magnetic material has a certain magnetic permeability and dielectric coefficient.
The invention patent of patent application publication No. CN114649681A discloses a wiring system of independent dual-coil wireless passive electromagnetic antenna board and a working method thereof. This wireless passive electromagnetism antenna panel wiring system of stand alone type twin coil is with the transmitting coil array, the receiving coil array is arranged in proper order on the two sides of antenna panel, independent separately the arrangement separately each other, the condition of multiplexing the same set of coil of transmission and receiving has been avoided, thereby realized stand alone type multiunit control circuit coil array, provide sufficient wireless transmitting signal and stable received signal, can be used for the continuous work of wireless passive non-contact induction type electromagnetism handwriting pen, also can make control circuit module to its input signal's accurate quick data processing, there are transmit power not enough in having solved traditional technical scheme, the data calculation deviation that the received signal is unstable to cause is big, interference immunity is poor and there is the restriction scheduling problem of size.
In the prior art, a passive magnetic antenna with a large size is mainly adopted, and a very low frequency signal in a space is obtained in a mode of single-ended amplification of a rear stage by sensing the very low frequency magnetic signal in the space. This method has a large requirement on the size of the antenna, and the general size is about 260mm in length, 260mm in width, 300mm in height, which is not favorable for the requirement of miniaturization.
The prior art means has high requirements on CMRR of antenna received signals mainly through a single-end amplification form, and if antenna materials or sizes are not good, induced signal noise is large, and very low frequency signals cannot be well recovered at the back end.
To this end, we propose a textile dyeing apparatus to solve the above problems.
Disclosure of Invention
In order to overcome the above-mentioned defects in the prior art, embodiments of the present invention provide a method for implementing an active small magnetic antenna based on loranC very low frequency signals, in which a receiving front end of the antenna is obtained through differential winding, then the antenna resonates at 100KHz through a matching circuit, then a differential amplification form is used to obtain a differential amplification signal, and finally the differential amplification signal is transmitted to a subsequent stage through a shielding line for amplification processing.
In order to achieve the purpose, the invention provides the following technical scheme: the method for realizing the active small magnetic antenna based on the loranC very low frequency signal specifically comprises the following steps:
s1: establishing a receiving front end, obtaining the receiving front end of the active small magnetic antenna in a differential winding mode, and generating the receiving front end;
s2: frequency selection, namely enabling the antenna to resonate at 100KHz through a matching resonant circuit to achieve a frequency selection effect and generate a frequency selection signal;
s3: differential amplification, namely performing differential amplification on the small active antenna in a differential amplification mode to generate a differential amplification signal;
s4: and signal amplification, namely transmitting the differential amplification signal to a later stage in a shielded wire transmission mode, and performing signal amplification processing to generate an amplification signal.
In a preferred embodiment, when the S1 establishes the receive front end, the tap 1 is selected as the differential positive pole of the differential winding, and the tap 4 is selected as the differential negative pole of the differential winding.
In a preferred embodiment, the matching resonant circuit in step S2 is specifically: an inductance parameter L of the wound small antenna is tested by a meter, a capacitor C with the resonant frequency of 100KHz is obtained by calculation through a formula f = 1/(2 × pi (LC) (1/2)), and the active small antenna can resonate at 100KHz by connecting the capacitor C in parallel, so that the frequency selection effect is achieved.
In a preferred embodiment, the differential amplification form in step S3 is a three-stage amplification form:
s301: the differential amplification type first stage is an input buffer stage, and the amplification multiple is set to be 1-10 times;
s302: the second stage is an input amplification stage, and the amplification factor is set to be 5-100 times;
s303: and the third stage is an output driving stage, and the amplification factor is set to be 1-10 times.
In a preferred embodiment, the input buffer stage in step S301 is implemented by using an input buffer circuit, wherein the amplification factor is 2 × R3/R8, and CHA _2P and CHA _2N are differential output terminals of the input buffer stage.
In a preferred embodiment, in step S302, the input amplifier stage is implemented by using an input amplifier circuit, where CHA _2P and CHA _2N are differential input terminals of the input amplifier stage, the amplification factor is 2 × R5/R9, and CHA _3P and CHA _3N are differential output terminals of the input amplifier stage.
In a preferred embodiment, the output driver stage in step S303 is implemented by using an output driver circuit, where CHA _3P and CHA _3N are differential input terminals of the output buffer stage, the amplification factor is 2 × R7/R10, and CHA _4P and CHA _4N are differential output terminals of the output buffer stage.
In a preferred embodiment, said circuit board implements the method for implementing an active small magnetic antenna based on loranC very low frequency signals according to any one of claims 1 to 7.
The invention has the technical effects and advantages that:
1. compared with the prior art, the method for realizing the active small magnetic antenna based on the loranC very low frequency signal utilizes a differential winding mode as an access end of the antenna, amplifies the signal through a differential mode, and finally obtains the loranC very low frequency signal, so that the size requirement of the antenna is small, the size can achieve the length of 120mm, the width of 120mm and the height of 5mm, and the requirement of miniaturization is facilitated.
2. Compared with the prior art, the differential amplification circuit designed by the application can amplify signals in a splitting amplification mode and recover very low frequency signals at the rear end well.
Drawings
FIG. 1 is a block diagram of the process flow of the present invention.
Fig. 2 is a schematic diagram of a receive front end in embodiment 1 of the present invention.
Fig. 3 is a circuit diagram of an input buffer stage circuit provided in the present invention.
Fig. 4 is a circuit diagram of an input amplifier stage circuit provided in the present invention.
Fig. 5 is a circuit diagram of an output amplifier stage circuit provided by the present invention.
Fig. 6 is a schematic diagram of a receive front end in embodiment 2 of the present invention.
FIG. 7 is a schematic diagram of the steps of the present invention.
FIG. 8 is a schematic diagram of the step in step 3 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 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1:
the embodiment of the invention provides a method for realizing an active small magnetic antenna based on loranC very low frequency signals, which specifically comprises the following steps:
s1: establishing a receiving front end, obtaining the receiving front end of the active small magnetic antenna in a differential winding mode, and generating the receiving front end, wherein in the embodiment, a north-south phase is taken as an example for explanation, a tap 1 is selected as a differential positive pole of the differential winding, and a tap 4 is selected as a differential negative pole of the differential winding, as shown in fig. 2;
s2: frequency selection, make the antenna at 100KHz resonance through matching resonant circuit, reach the frequency selection effect, generate the frequency selection signal, wherein matching resonant circuit specifically is: an inductance parameter L of the wound small antenna is tested by a meter, a capacitor C with the resonant frequency of 100KHz is obtained by calculation through a formula f = 1/(2 × pi (LC) (1/2)), and the active small antenna can resonate at 100KHz by connecting the capacitor C in parallel, so that the frequency selection effect is achieved;
s3: differential amplification, which is to perform differential amplification on the small active antenna in a differential amplification form to generate a differential amplification signal, wherein the differential amplification form in the embodiment adopts a small magnetic antenna circuit to perform differential amplification;
s4: and signal amplification, namely transmitting the differential amplification signal to a later stage in a shielded wire transmission mode, performing signal amplification processing to generate an amplification signal, and transmitting the signal subjected to differential amplification to the later stage through a shielded wire for amplification processing.
And transmitting the signals subjected to differential amplification to a later stage through a shielding wire for amplification processing. The amplification factor is 1000 times in total through three-stage amplification, and the signal is conditioned to a proper range through an adjustable gain differential amplifier in the later stage, so that a good loranC very low frequency signal can be obtained.
Further, specifically explaining the small magnetic antenna circuit in this embodiment, the small magnetic antenna circuit is mainly divided into 4 parts, the first part is matched with the small magnetic antenna, the second part is an input buffer stage, the third part is an input amplifier stage, the fourth part is an output driver stage, and the four parts are specifically as follows:
referring to fig. 3, in the present circuit, CON1 and CON2 are differential input terminals of the small magnetic antenna, C5 and C6 are matching terminals of the small magnetic antenna, and the matching principle is f = 1/(2 × pi (LC) (1/2)), which is used as a matching part with the small magnetic antenna circuit in the present embodiment;
referring to fig. 3, the rest of the circuit is an input buffer stage circuit, wherein the amplification factor is 2 × R3/R8, and CHA _2P and CHA _2N are differential output terminals of the input buffer stage;
referring to fig. 4, the circuit is used as an input amplifier stage circuit, CHA _2P and CHA _2N are differential input terminals of the input amplifier stage, the amplification factor of the circuit is 2 × R5/R9, and CHA _3P and CHA _3N are differential output terminals of the input amplifier stage;
referring to fig. 5, CHA _3P and CHA _3N are differential input terminals of the output buffer stage, the circuit amplification factor is 2 × R7/R10, and CHA _4P and CHA _4N are differential output terminals of the output buffer stage.
Example 2:
the embodiment provides another implementation method of an active small magnetic antenna based on loranC very low frequency signals, which specifically comprises the following steps:
s1: establishing a receiving front end, obtaining the receiving front end of the active small magnetic antenna in a differential winding mode, and generating the receiving front end, wherein in the embodiment, an east-west phase is taken as an example for description, the east-west phase is the same as the south-north winding mode, a tap 2 is selected as a differential positive pole of the differential winding, and a tap 3 is selected as a differential negative pole of the differential winding, as shown in fig. 6;
s2: frequency selection, make the antenna at 100KHz resonance through matching resonant circuit, reach the frequency selection effect, generate the frequency selection signal, wherein matching resonant circuit specifically is: an inductance parameter L of the wound small antenna is tested by a meter, a capacitor C with the resonant frequency of 100KHz is obtained by calculation through a formula f = 1/(2 × pi (LC) (1/2)), and the active small antenna can resonate at 100KHz by connecting the capacitor C in parallel, so that the frequency selection effect is achieved;
s3: differential amplification, which is to perform differential amplification on the small active antenna in a differential amplification form to generate a differential amplification signal, wherein the differential amplification form in the embodiment adopts a small magnetic antenna circuit to perform differential amplification;
s4: and signal amplification, namely transmitting the differential amplification signal to a later stage in a shielded wire transmission mode, performing signal amplification processing to generate an amplification signal, and transmitting the signal subjected to differential amplification to the later stage through a shielded wire for amplification processing.
And transmitting the signals after differential amplification to a later stage through a shielding wire for amplification processing. Through three-stage amplification, the total amplification factor is 1000 times, and the signal is conditioned to a proper range by a back-stage adjustable gain differential amplifier, so that a good loranC very low frequency signal can be obtained.
Further, specifically explaining the small magnetic antenna circuit in this embodiment, the small magnetic antenna circuit is mainly divided into 4 parts, the first part is matched with the small magnetic antenna, the second part is an input buffer stage, the third part is an input amplifier stage, the fourth part is an output driver stage, and the four parts are specifically as follows:
referring to fig. 3, in the present circuit, CON1 and CON2 are differential input terminals of the small magnetic antenna, C5 and C6 are matching terminals of the small magnetic antenna, and the matching principle is f = 1/(2 × pi (LC) (1/2)), which is used as a matching part with the small magnetic antenna circuit in the present embodiment;
referring to fig. 3, the rest of the circuit is an input buffer stage circuit, wherein the amplification factor is 2 × R3/R8, and CHA _2P and CHA _2N are differential output terminals of the input buffer stage;
referring to fig. 4, the circuit is used as an input amplifier stage circuit, CHA _2P and CHA _2N are differential input terminals of the input amplifier stage, the amplification factor of the circuit is 2 × R5/R9, and CHA _3P and CHA _3N are differential output terminals of the input amplifier stage;
referring to fig. 5, the circuit is used as an output amplifier stage circuit, CHA _3P and CHA _3N are differential input terminals of an output buffer stage, the circuit amplification factor is 2 × R7/R10, and CHA _4P and CHA _4N are differential output terminals of the output buffer stage
Example 3:
the embodiment provides a circuit board, circuit components and parts are welded on a bonding pad of the circuit board through pins, the bonding pad is connected with the bonding pad through a copper mold lead, and the circuit board comprises a circuit for operating the implementation method of the active small magnetic antenna based on loranC very low frequency signals.
The circuit board may be any available medium or data storage device that can be accessed by a computer, including but not limited to a ceramic substrate (alumina ceramic circuit board, aluminum nitride ceramic circuit board), a ceramic circuit board, a PCB board, an aluminum substrate, a high frequency board, a thick copper board, an impedance board, and the like.
According to the method for realizing the loranC very low frequency signal-based active small magnetic antenna, a differential winding mode is used as an access end of the antenna, the signal is amplified through a differential mode, and the loranC very low frequency signal is obtained finally, so that the loranC very low frequency signal antenna has small size requirement on the antenna, the size can achieve the length of 120mm, the width of 120mm and the height of 5mm, and the requirement for miniaturization is met. Through the differential amplification circuit of this application design, amplify the signal through the split form of amplification, very low frequency signal can be resumeed that the rear end is fine.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The method for realizing the active small magnetic antenna based on the loranC very low frequency signal is characterized in that: the method specifically comprises the following steps:
s1: establishing a receiving front end, obtaining the receiving front end of the active small magnetic antenna in a differential winding mode, and generating the receiving front end;
s2: frequency selection, namely enabling the antenna to resonate at 100KHz through a matching resonant circuit to achieve a frequency selection effect and generate a frequency selection signal;
s3: differential amplification, namely performing differential amplification on the small active antenna in a differential amplification mode to generate a differential amplification signal;
s4: and signal amplification, namely transmitting the differential amplification signal to a later stage in a shielded wire transmission mode, and performing signal amplification processing to generate an amplification signal.
2. The method of claim 1, wherein the implementation of the loranC very low frequency signal-based active small magnetic antenna is characterized in that: and when the receiving front end is established in the S1, the tap 1 is selected as the differential anode of the differential winding, and the tap 4 is selected as the differential cathode of the differential winding.
3. The method of claim 1, wherein the implementation of the loranC very low frequency signal-based active small magnetic antenna is characterized in that: the step S2 of matching the resonant circuit specifically includes: an inductance parameter L of the wound small antenna is tested by a meter, a capacitor C with the resonant frequency of 100KHz is obtained by calculation through a formula f = 1/(2 × pi (LC) (1/2)), and the active small antenna can resonate at 100KHz by connecting the capacitor C in parallel, so that the frequency selection effect is achieved.
4. The method of claim 1, characterized in that it comprises: the differential amplification form in the step S3 is specifically a three-level amplification form:
s301: the differential amplification type first stage is an input buffer stage, and the amplification multiple is set to be 1-10 times;
s302: the second stage is an input amplification stage, and the amplification factor is set to be 5-100 times;
s303: and the third stage is an output driving stage, and the amplification factor is set to be 1-10 times.
5. The method of claim 4, characterized in that it comprises the following steps: in step S301, the input buffer stage is implemented by using an input buffer circuit, where the amplification factor is 2 × R3/R8, and CHA _2P and CHA _2N are differential output terminals of the input buffer stage.
6. The method of claim 4, characterized in that it comprises the following steps: in step S302, the input amplifier stage is implemented by using an input amplifier circuit, where CHA _2P and CHA _2N are differential input terminals of the input amplifier stage, the amplification factor is 2 × R5/R9, and CHA _3P and CHA _3N are differential output terminals of the input amplifier stage.
7. The method of claim 1, wherein the implementation of the loranC very low frequency signal-based active small magnetic antenna is characterized in that: in step S303, the output driver stage is implemented by using an output driver circuit, where CHA _3P and CHA _3N are differential input terminals of the output buffer stage, the amplification factor is 2 × R7/R10, and CHA _4P and CHA _4N are differential output terminals of the output buffer stage.
8. A circuit board, characterized by: the circuit board implements the method for implementing an active small magnetic antenna based on loranC very low frequency signals according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210829054.3A CN115189706A (en) | 2022-07-15 | 2022-07-15 | Method for realizing active small magnetic antenna based on loranC very low frequency signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210829054.3A CN115189706A (en) | 2022-07-15 | 2022-07-15 | Method for realizing active small magnetic antenna based on loranC very low frequency signal |
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| CN113009409A (en) * | 2021-02-08 | 2021-06-22 | 中国科学院国家授时中心 | Magnetic antenna signal synthesis method suitable for Loran-C timing terminal |
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2022
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| CN103441803A (en) * | 2013-09-10 | 2013-12-11 | 北京科技大学 | Underground low-frequency wireless communication system based on low-power small electric antenna |
| CN106487402A (en) * | 2016-11-24 | 2017-03-08 | 中国科学技术大学 | The low-power consumption receiver rf front-end of radio frequency interface on comprehensive piece |
| CN107294548A (en) * | 2017-06-06 | 2017-10-24 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | A kind of LoranC system emitter main circuit and its transmitted waveform generation method |
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