KR-20260062523-A - MAGNETIC FIELD COMMUNICATION SYSTEM INCLUDING LOOP ANTENNA, AND METHOD FOR MANUFACTURING THE SAME

KR20260062523AKR 20260062523 AKR20260062523 AKR 20260062523AKR-20260062523-A

Abstract

A method for manufacturing a magnetic field communication system including a loop antenna according to one embodiment of the present disclosure may include: configuring an effective bandwidth matrix based on a determination of whether bandwidth values calculated based on inductances and internal resistance values according to the number of turns of the loop antenna satisfy defined system requirements; configuring an effective magnetic field density matrix based on a determination of whether magnetic field density values at a distance equal to the communication distance, according to a combination of the value of the series-connected resistor and the number of turns of the loop antenna, satisfy the defined system requirements including reception sensitivity; and determining the number of turns of the loop antenna and the value of the series-connected resistor based on the effective bandwidth matrix and the effective magnetic field density matrix.

Inventors

오정훈
조인귀
김장열
윤계석
이현준

Assignees

한국전자통신연구원

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (17)

A method for manufacturing a magnetic field communication system comprising a transmitting front end, a receiving front end, and a loop antenna, A step of defining system requirements including bandwidth, communication distance, and reception sensitivity, and determining the structural and material characteristics of the loop antenna including structure, size, and coil material; A step of calculating inductance and internal resistance values according to the number of turns of the loop antenna based on the structural and material characteristics of the loop antenna; The transmitting front end includes a series-connected resistor connected in series with the loop antenna, and a step of calculating bandwidth values according to a combination of the value of the series-connected resistor and the number of turns of the loop antenna based on the inductances and internal resistance values according to the number of turns of the loop antenna; A step of constructing an effective bandwidth matrix based on a determination of whether the bandwidth values calculated based on the inductances and internal resistance values according to the number of windings of the loop antenna satisfy the defined system requirements; A step of calculating magnetic field density values at a distance equal to the communication distance, based on a combination of the value of the series-connected resistor and the number of windings of the loop antenna; A step of constructing an effective magnetic field density matrix based on a determination of whether the calculated magnetic field density values satisfy the defined system requirements, including the receiving sensitivity; A step of determining the number of turns of the loop antenna and the value of the series-connection resistor based on the effective bandwidth matrix and the effective magnetic field density matrix; and A method comprising the steps of fabricating the loop antenna based on the number of turns determined above and configuring the transmitting front end based on the determined value of the series-connection resistor.
In Article 1, The defined system requirements further include the resonant frequency, The above-described transmitting front end further includes a series-connected capacitor connected in series with the above-described series-connected resistor, wherein The above method is: The method further includes the step of calculating the capacitances of the series-connected capacitors according to the number of turns of the loop antenna to cause the loop antenna to resonate at the above resonant frequency, and A method characterized in that the step of calculating bandwidth values according to the combination of the value of the series-connected resistor and the number of turns of the loop antenna is further based on the calculated capacitances.
In Article 1, The step of determining the number of turns of the loop antenna and the value of the series-connected resistor based on the effective bandwidth matrix and the effective magnetic field density matrix is: A step of multiplying the effective bandwidth matrix with the effective magnetic field density matrix; and A method for determining the number of turns corresponding to the position (row m, column n) and the value of the series-connected resistor based on the position (row m, column n) of the element with a value of 1 in the multiplication result matrix.
In Article 1, The step of constructing the above effective bandwidth matrix is: A step of configuring the calculation results of bandwidth values according to the combination of the value of the series-connected resistor and the number of turns of the loop antenna into a first table; and Construct the effective bandwidth matrix based on the first table above, but: Based on the judgment that the first bandwidth value included in the first position within the first table satisfies the system requirements defined above, the value of the element at the first position of the effective bandwidth matrix is written as 1, and Based on the judgment that the second bandwidth value included in the second position within the first table does not satisfy the defined system requirements, the method includes the step of writing the value of the element at the second position of the effective bandwidth matrix as 0, and The step of constructing the above effective magnetic field density matrix is: A step of configuring a second table of calculated magnetic field density values at a distance equal to the communication distance, according to the combination of the value of the series-connected resistor and the number of turns of the loop antenna; and Construct the effective magnetic field density matrix based on the second table above, but: Based on the judgment that the first magnetic field density value included in the third position within the second table satisfies the system requirements defined above, the value of the element at the third position of the effective magnetic field density matrix is written as 1, and A method comprising the step of writing the value of the element at the fourth position of the effective magnetic field density matrix as 0, based on the judgment that the second magnetic field density value included at the fourth position in the second table does not satisfy the system requirements defined above.
In Article 4, In the step of constructing the above effective bandwidth matrix: The judgment that the above-mentioned first bandwidth value satisfies the above-mentioned system requirements is based on the judgment that the above-mentioned first bandwidth value is greater than or equal to the bandwidth of the above-mentioned system requirements, and, The judgment that the second bandwidth value does not satisfy the system requirements defined above is based on the judgment that the second bandwidth value is smaller than the bandwidth of the system requirements defined above, and In the step of constructing the above effective magnetic field density matrix: The judgment that the first magnetic field density value satisfies the defined system requirements is based on the judgment that the first magnetic field density value is greater than or equal to the magnetic field density value corresponding to the reception sensitivity of the defined system requirements, and A method characterized in that the judgment that the second magnetic field density value does not satisfy the defined system requirements is based on the judgment that the second bandwidth value is smaller than the magnetic field density value corresponding to the reception sensitivity of the defined system requirements.
In Article 1, The receiving front end includes a parallel-connection resistor connected in parallel with the loop antenna, wherein The above method is, The method further includes the step of calculating the current values flowing through the receiving front end and the values of the parallel-connected resistors according to the number of turns of the loop antenna so that the magnetic field density value corresponding to the receiving sensitivity satisfies the system requirements defined above, A method characterized in that magnetic field density values at a distance from the communication distance, according to the combination of the value of the series-connected resistor and the number of turns of the loop antenna, are calculated based on the current values calculated according to the number of turns of the loop antenna.
In Article 6, The above method is: After the number of turns of the loop antenna is determined based on the effective bandwidth matrix and the effective magnetic field density matrix, the step of determining the value of the parallel-connection resistor based on the determined number of turns; and A method further comprising the step of configuring a receiving front end based on the determined value of the parallel-connection resistor.
In Article 1, A method characterized in that the number of rows and columns of the effective bandwidth matrix is the same as the number of rows and columns of the effective magnetic field density matrix.
In Article 1, The above method is: A method further comprising the step of testing a manufactured communication system and verifying whether it meets defined system requirements for resonant frequency, bandwidth, communication distance, and reception sensitivity.
In a magnetic field communication system, Loop antenna; A modem that generates a digital transmission signal; A digital-to-analog converter that converts the above digital transmission signal into an analog transmission signal; A transmission front end that transmits the analog transmission signal to the loop antenna and includes a series-connection resistor connected in series to the loop antenna; A receiving front end that receives an analog reception signal from the above-mentioned loop antenna; and The analog-to-digital converter converts the analog reception signal into a digital reception signal and transmits the digital reception signal to the modem, The number of turns of the loop antenna and the value of the series-connected resistor are determined based on the effective bandwidth matrix and the effective magnetic field density matrix, and The above effective bandwidth matrix is configured based on a determination of whether bandwidth values calculated based on inductances and internal resistance values according to the number of turns of the loop antenna satisfy defined system requirements, A magnetic field communication system characterized in that the above effective magnetic field density matrix is configured based on a determination of whether magnetic field density values at a distance equal to the communication distance, according to a combination of the value of the series-connected resistor and the number of turns of the loop antenna, satisfy the above-defined system requirements including reception sensitivity.
In Article 10, The system requirements defined above further include a resonant frequency, The above-described transmitting front end further includes a series-connected capacitor connected in series with the above-described series-connected resistor, wherein The capacitances of the series-connected capacitors for causing the loop antenna to resonate at the above resonant frequency are calculated according to the number of turns of the loop antenna, and A magnetic field communication system characterized in that the calculation of bandwidth values according to the combination of the value of the series-connected resistor and the number of turns of the loop antenna is further based on the calculated capacitances.
In Article 10, A magnetic field communication system characterized in that the value of the series-connected resistor is determined based on the position (row m, column n) of the element with a value of 1 in the result of multiplication between the effective bandwidth matrix and the effective magnetic field density matrix.
In Article 10, To construct the above effective bandwidth matrix: The calculation results of bandwidth values according to the combination of the value of the series-connected resistor and the number of turns of the loop antenna are configured as a first table, and The effective bandwidth matrix is configured based on the first table above: Based on the judgment that the first bandwidth value included in the first position within the first table satisfies the system requirements defined above, the value of the element at the first position of the effective bandwidth matrix is written as 1, and Based on the judgment that the second bandwidth value included in the second position within the first table does not satisfy the system requirements defined above, the value of the element at the second position of the effective bandwidth matrix is written as 0, and To construct the above effective magnetic field density matrix: The calculation results of magnetic field density values at a distance equal to the communication distance, according to the combination of the value of the series-connected resistor and the number of turns of the loop antenna, are configured in a second table, and The effective magnetic field density matrix is constructed based on the second table above: Based on the judgment that the first magnetic field density value included in the third position within the second table satisfies the system requirements defined above, the value of the element at the third position of the effective magnetic field density matrix is written as 1, and A magnetic field communication system characterized by the fact that, based on the judgment that the second magnetic field density value included in the fourth position within the second table does not satisfy the system requirements defined above, the value of the element at the fourth position of the effective magnetic field density matrix is written as 0.
In Article 13, The judgment that the first bandwidth value satisfies the defined system requirements is based on the judgment that the first bandwidth value is greater than or equal to the bandwidth of the defined system requirements, and The judgment that the above second bandwidth value does not satisfy the above-defined system requirements is based on the judgment that the above second bandwidth value is smaller than the bandwidth of the above-defined system requirements, and The judgment that the first magnetic field density value satisfies the defined system requirements is based on the judgment that the first magnetic field density value is greater than or equal to the magnetic field density value corresponding to the reception sensitivity of the defined system requirements, and A magnetic field communication system characterized in that the judgment that the second magnetic field density value does not satisfy the defined system requirements is based on the judgment that the second bandwidth value is smaller than the magnetic field density value corresponding to the reception sensitivity of the defined system requirements.
In Article 10, The receiving front end includes a parallel-connection resistor connected in parallel with the loop antenna, wherein The current values flowing through the receiving front end and the values of the parallel-connected resistors are calculated according to the number of turns of the loop antenna so that the magnetic field density value corresponding to the receiving sensitivity satisfies the system requirements defined above, and A magnetic field communication system characterized in that magnetic field density values at a distance from the communication distance, according to a combination of the value of the series-connected resistor and the number of turns of the loop antenna, are calculated based on the current values calculated according to the number of turns of the loop antenna.
In Article 15, After the number of turns of the loop antenna is determined based on the effective bandwidth matrix and the effective magnetic field density matrix, the value of the parallel-connection resistor is determined based on the determined number of turns, and A magnetic field communication system characterized by the receiving front end being configured based on the determined value of the parallel-connection resistor.
In Article 10, A magnetic field communication system characterized in that the number of rows and columns of the effective bandwidth matrix is the same as the number of rows and columns of the effective magnetic field density matrix.

Description

Magnetic field communication system including a loop antenna, and method for manufacturing the same The present disclosure relates to a magnetic field communication system, and more specifically, to a magnetic field communication system including a loop antenna and a method for manufacturing the same. Conventional magnetic field communication systems using loop antennas are primarily used for short-range communication, and NFC (Near Field Communication) technology is one of the representative examples. In such systems, the distance between antennas is generally limited to within a few centimeters. To apply magnetic field communication to medium-to-long distances (e.g., 100m or more), there is a method of configuring the loop antenna in a resonant form. Loop antennas using resonant frequencies are used for wireless charging because they have excellent power efficiency by generating high current with low output power to form a high-density magnetic field; however, this method has narrowband characteristics, which limits the communication bandwidth. Although a wide bandwidth is required for data communication, the narrowband characteristics of loop antennas limit signal transmission, making stable communication difficult. Furthermore, when a resonant loop antenna is used as a receiver, it performs optimally only at a specific frequency. Consequently, in medium-to-long distance communication, the resonant frequency can fluctuate due to various environmental factors and interference, which adversely affects signal stability and reduces reception sensitivity. For these reasons, designing medium-to-long distance communication systems using resonant loop antennas is difficult to realize because it must overcome various technical limitations such as difficulty in securing bandwidth, signal attenuation, frequency sensitivity, and high output power requirements. FIG. 1 illustrates an exemplary block diagram of a magnetic field-based communication system according to one embodiment of the present disclosure. FIG. 2 illustrates an exemplary loop antenna according to one embodiment of the present disclosure. FIG. 3 is a table illustrating bandwidth values calculated according to a combination of the value of a series-connected resistor and the number of turns of a loop antenna according to one embodiment of the present disclosure. FIG. 4 is a graph illustrating the inductance of loop antennas with different number of turns according to frequency in one embodiment of the present disclosure. FIG. 5 is a table illustrating bandwidth values calculated according to a combination of the value of a series-connected resistor and the number of turns of a loop antenna according to one embodiment of the present disclosure. Figure 6 illustrates the matrix resulting from the multiplication between the effective bandwidth matrix and the effective magnetic field density matrix. FIG. 7 is a flowchart illustrating a method for manufacturing a magnetic field communication system including a loop antenna according to one embodiment of the present disclosure. FIG. 8 is a flowchart illustrating a method for manufacturing a magnetic field communication system including a loop antenna according to one embodiment of the present disclosure. FIG. 9 is a flowchart for specifically explaining step S820 of FIG. 8 according to one embodiment of the present disclosure. FIG. 10 is a flowchart for specifically explaining step S830 of FIG. 8 according to one embodiment of the present disclosure. FIG. 11 is a flowchart for specifically explaining step S850 of FIG. 8 according to one embodiment of the present disclosure. FIG. 12 is a flowchart illustrating a method for manufacturing a magnetic field communication system including a loop antenna according to one embodiment of the present disclosure. In the following, embodiments of the present disclosure will be described clearly and in detail so that a person skilled in the art can easily practice the present disclosure. Terms such as "unit" and "module" used below, or functional blocks illustrated in the drawings, may be implemented in the form of software configurations, hardware configurations, or combinations thereof. In order to clearly explain the technical concept of the present invention, detailed descriptions of redundant components are omitted below. In this document, each of the phrases such as "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "at least one of A, B, or C" may include any one of the items listed together with the corresponding phrase, or all possible combinations thereof. FIG. 1 illustrates an exemplary block diagram of a magnetic field-based communication system according to one embodiment of the present disclosure. The magnetic field communication system of FIG. 1 may include a modem (110), a digital-to-analog converter (120; DAC), an analog-to-digital converter (130; ADC), a transmitting front end (210), a receiving f