Electromagnetic wave shielding filter

Abstract

The present application relates to a filter configuration method, which is not configured by a low-pass filter or a band-pass filter when configuring an electromagnetic wave shielding filter, but is configured by a magnetic field transmission method, which transmits only a desired signal while maintaining the shielding of an undesired electromagnetic wave. The present application relates to an electromagnetic wave shielding filter for high-frequency communication, which is configured with an elliptical ferrite core inside the filter, a primary coil and a secondary coil are arranged at both ends, and then, for the elliptical magnetic core, a tail is made of an electromagnetic wave shielding material, the signal on the primary coil side is transmitted to the secondary coil in the form of a magnetic field, and the remaining undesired common mode component is removed.

Description

Technical Field

[0001] One embodiment of the present invention relates to an electromagnetic wave shielding filter, specifically to a filter within an electromagnetic wave shielding facility that allows desired high-frequency signals to pass through while blocking other interfering frequency components. Background Technology

[0002] The following description provides background information related to this embodiment only and does not constitute conventional technology.

[0003] Typically, to verify the shielding effectiveness of electromagnetic wave shielding facilities, shielding tests are conducted in accordance with EEEE-std-299 or MIL-STD-188-125-1 / 2, National Institute of Communications Announcement No. 2016-10, etc., to confirm the shielding performance of the electromagnetic wave shielding facilities.

[0004] Electromagnetic wave shielding facilities are basically divided into internal and external components based on electromagnetic waves. Through design, the facilities prevent the external electromagnetic wave environment from affecting the servers or communication equipment inside the facilities. They utilize shielded doors for the movement of personnel or equipment and electromagnetic wave shielding filters for internal power supply or communication to connect the internal and external components of the electromagnetic wave shielding facilities.

[0005] Currently, traditional electromagnetic wave shielding filters typically use low-pass filters to block the high-frequency band of the electromagnetic waves to be shielded, from 10kHz to above 100kHz and several to 18GHz, allowing low-frequency frequencies like 60Hz (for power supply) to pass through. Depending on the situation, band-pass filters are sometimes used to allow only specific frequency bands to pass. In communication frequencies (e.g., 500MHz), the high-frequency communication frequency is higher than the cutoff frequency of the low-pass filter. In this case, after photoelectric conversion, the signal is input through an optical cable, and then electro-optical conversion is performed to transmit the signal while maintaining electromagnetic wave shielding, thus connecting the inside and outside of the shielding facility.

[0006] Low-pass electromagnetic wave shielding filters are typically used as military EMP shielding filters. They shield electromagnetic waves up to the lowest frequencies, with a 3dB loss cutoff frequency close to 10kHz. Cutoff frequencies lower than this would introduce power loss; therefore, a lower cutoff frequency of 10kHz is generally considered the minimum. Consequently, frequencies below 10kHz cannot pass through the filter, limiting its effectiveness. Thus, currently used low-pass electromagnetic wave shielding filters have limitations in blocking the entire frequency band and allowing only signals in the desired band to pass. This indicates a need for fundamental structural changes in the design of electromagnetic wave shielding filters. Summary of the Invention

[0007] The problem to be solved

[0008] The purpose of this embodiment is to configure a high-permeability elliptical magnetic core in the part of the electromagnetic wave shielding surface outside and inside the filter. Through the core shielding and penetration part with suitable depth and diameter to block electromagnetic waves, for high-frequency electromagnetic wave signals, the primary coil converts them into differential mode. In the elliptical magnetic core, the differential mode magnetic field is transmitted from the outside of the shielding facility to the inside. The secondary coil restores the differential mode high-frequency signal. While transmitting the desired high-frequency signal, it blocks the unwanted common mode electromagnetic waves, thereby forming an electromagnetic shield in a low-pass or band-pass filter.

[0009] Problem Solution

[0010] This embodiment constitutes an electromagnetic wave shielding filter. This electromagnetic wave shielding filter, as a structure disposed on a shielding wall of an electromagnetic wave shielding facility, has primary and secondary coils wound around the short sides of a high-permeability elliptical (circular) magnetic core structure. The elliptical magnetic core includes: a primary coil composed of a high-conductivity (low-impedance) material, with a depth and diameter suitable for longitudinally implementing electromagnetic wave shielding within the electromagnetic wave shielding filter, symmetrically positioned opposite each other around the high-permeability elliptical magnetic core structure; an outer casing including the secondary coil and the high-permeability magnetic core (magnetic path); and a structure filled with high-conductivity (low-impedance) material along the longitudinal direction at the core center.

[0011] Invention Effects

[0012] As described above, according to this embodiment, a high permeability magnetic path is formed on the electromagnetic wave shielding interface between the inside and outside of the filter, allowing RF or differential mode high-frequency electromagnetic wave signals to pass through an elliptical (or circular) magnetic core and be transmitted from the outside to the inside in the form of a magnetic field. The periphery of the elliptical magnetic core and the inner surface of the shielding filter box are filled with a high conductivity (low impedance) material to shield electromagnetic waves. The electromagnetic wave shielding facility shields the electric and magnetic fields outside and inside, thus allowing high-frequency wireless signals to pass through, but the remaining common mode electromagnetic waves are shielded across the entire frequency band.

[0013] Furthermore, while high-frequency signals are differential-mode and can pass through, high-output electromagnetic waves, such as external noise, are common-mode and cannot pass through the elliptical magnetic core. This ensures that noise other than the signals intended to pass through is shielded across the entire frequency band. This is a key technical feature that distinguishes this invention from traditional bandpass or low-pass electromagnetic shielding filters. Attached Figure Description

[0014] Figure 1 An electromagnetic wave shielding filter according to this embodiment is shown, including an elliptical (circular) magnetic core, a core shield, and a through section.

[0015] Figure 2 An example is shown of applying an electromagnetic wave shielding filter, including an elliptical magnetic core, a magnetic core shield, and a through section, to an electromagnetic wave shielding facility according to this embodiment.

[0016] Figure 3 The diagram shows views of an electromagnetic wave shielding filter, including an elliptical magnetic core, shown along its side and longitudinal sections according to this embodiment.

[0017] Figure 4 A view of an electromagnetic wave shielding filter, comprising a dual elliptical magnetic core and a primary and secondary coil, is shown according to this embodiment for simultaneously transmitting and receiving high-frequency signals.

[0018] Figure 5 This embodiment illustrates an example of using a coaxial cable to construct a primary and secondary loop antenna that replaces the primary and secondary coils, and applying an electromagnetic wave shielding filter including a magnetic core shield and a through section.

[0019] Figure 6 The following configuration is shown: According to this embodiment, in order to enable the differential mode high-frequency signal to pass through using Figure 5 The filter for the coaxial cable shown has an ungrounded inner core and a partially broken external grounding wire on the coaxial cable. This is to ensure that the antenna maintains electromagnetic wave shielding while generating a magnetic field. The purpose of partially breaking the external grounding wire on the coaxial cable is to enable the primary and secondary loop antennas to effectively transmit the magnetic field.

[0020] Figure 7 The following configuration is shown: According to this embodiment, in order to allow RF signals in the GHz band to pass through an electromagnetic wave shielding filter using a coaxial cable, the ferrite core is removed, and a hollow (Air) core is applied. The wide surface of a small loop antenna with a coaxial cable structure is applied to an electromagnetic wave shielding filter with a mating structure. The purpose is to apply it to an electromagnetic wave shielding filter that allows GHz band signals to pass through.

[0021] Figure 8 The honeycomb structure used for ventilation in this electromagnetic wave shielding facility is shown.

[0022] Figure 9 This illustrates a commonly used low-pass filter-type electromagnetic wave shielding filter.

[0023] Explanation of reference numerals in the attached figures

[0024] 101, 201, 301, 401, 501, 601, 701: Electromagnetic wave shielding filter housing

[0025] 202, 302, 402, 502: Primary coil

[0026] 104, 204, 304, 404, 504: Elliptical (circular) magnetic core (magnetic path)

[0027] 203, 303, 403, 403: Primary and secondary coils

[0028] 105, 205, 305, 405, 505, 605, 705: Core shielding and through-hole (high conductivity material)

[0029] 506, 507, 606, 607, 706, 707: RF connectors

[0030] 508, 509, 608, 609, 708, 709: Coaxial cables

[0031] 502, 503, 602, 603, 702, 703: Coaxial cable terminated loop antenna (primary and secondary coil functions)

[0032] 206: Electromagnetic wave shielding door; 801: Honeycomb structure

[0033] 802: Diameter of the honeycomb structure (g) 803: Depth of the honeycomb structure (d)

[0034] 920, 921: Inductors; 923, 924, 925: Capacitors

[0035] 926: Lightning arrester (MOV, Arrestor) Detailed Implementation

[0036] The following describes this embodiment in detail with reference to the accompanying drawings.

[0037] Figure 1 An electromagnetic wave shielding filter comprising an elliptical magnetic core according to this embodiment is shown.

[0038] According to this embodiment, the electromagnetic wave shielding filter including an elliptical (circular) core includes an electromagnetic wave shielding box 101, an elliptical (circular) magnetic core 102, a primary coil 102, a secondary coil 103, and a magnetic core shielding and through portion 105. However, the components included in the electromagnetic wave shielding filter are not necessarily limited to this.

[0039] like Figure 1As shown, in an electromagnetic wave shielding filter including an elliptical magnetic core, when the filter is installed on one side of the shielding wall of the electromagnetic wave shielding facility, the primary coil 102 and the secondary coil 103 are positioned at both ends of the elliptical magnetic core. The elliptical magnetic core 103 utilizes a high-permeability material with excellent high-frequency characteristics, thus allowing the magnetic field generated by the transmitted signal to be transmitted from the primary coil 102 through the elliptical core to the opposite side core, and then reverted to a voltage state in the opposite side secondary coil 103. The reverse process, from the secondary coil 103 to the primary coil 102, is also possible.

[0040] When a high-frequency communication signal is input to the primary coil 102, it is converted into a magnetic field, which is induced and transmitted to the secondary coil via the elliptical magnetic core 103. The magnetic field transmitted back to the secondary coil is converted into a voltage form by the secondary coil, restoring the received signal. However, although this is a transformer configuration without electromagnetic wave shielding, when the inner wall of the shielding filter is filled with a high-conductivity (low-impedance) material around the elliptical magnetic core 104, a tunnel-like structure is formed around the magnetic core 104, thus creating conditions for electromagnetic wave shielding.

[0041] Furthermore, elliptical ferrite bricks have relatively weak physical durability. When constructing elliptical magnetic core shields and through-holes, using iron or copper flocs not only makes manufacturing easier but also provides strong protection against external impacts. When high-density metal forms are used to fill the filter housing and core, external impacts are directly transmitted. However, when filled with low-density materials in the form of iron or copper flocs, physical impacts are absorbed by the low-density material (similar to a sponge structure), which limits the transmission of impacts.

[0042] like Figure 9 As shown, a low-pass filter type electromagnetic wave shielding filter consists of inductors 920 and 921, capacitors 923, 924 and 925, and surge protector 927. Due to its structure, it allows frequencies below and above the cutoff frequency to pass through, but it is difficult to allow frequencies above the low-pass filter's cutoff frequency to pass through the shielding facility. Therefore, in order to allow only specific frequency bands to pass through, a band-pass filter type electromagnetic wave shielding filter is sometimes used. However, the frequency shielding characteristics near the passband of such a low-pass or band-pass filter will cause the frequency band to be suppressed and attenuated by about 60dB, making it difficult to ensure complete shielding characteristics. Furthermore, when a high-output electromagnetic wave (EMP) signal is input within the frequency band of the band-pass filter, the electromagnetic wave shielding filter is difficult to function.

[0043] However, according to the electromagnetic wave shielding filter of this embodiment ( Figure 1In the case of the electromagnetic induction law of Maxwell's equations (Equation 1), the high-frequency signal induced by the elliptical magnetic core 104 is only transmitted in the differential mode structure. Therefore, high-output electromagnetic waves and / or external electromagnetic noise and other radioactive common mode electromagnetic waves cannot pass through the elliptical magnetic core 104 from the primary coil 102 and then be transmitted to the secondary coil 103.

[0044]

[0045] [Formula 1]

[0046] Furthermore, the diameter of the elliptical magnetic core used in this embodiment is about 3 to 10 mm. Therefore, when a high-output electromagnetic wave of a certain value or above is input, the magnetic flux of the elliptical magnetic core 104 will saturate, and the energy above a certain value cannot be transmitted to the secondary coil. Thus, the receiving end and transmitting end of the communication equipment connected to the secondary side output of the elliptical magnetic core can be protected.

[0047] Furthermore, although the components constituting the electromagnetic wave shielding filter are high-frequency components, they are all manually operated, so the possibility of damage is extremely low. This is because they do not contain substances that are oxidized or whose chemical properties change over time.

[0048] Furthermore, including in low-pass filters ( Figure 9 The components, particularly surge protectors 927, capacitors 926, 920, and 921, have a limited lifespan and cannot be used indefinitely. These components need to be replaced when damaged or at regular intervals. Such components are applied to the electromagnetic wave shielding filter according to this embodiment. Figure 1 The shielding filter according to this embodiment can use the equipment inside the shielding facility without interruption, and there is almost no phenomenon of the ferrite core 104 being damaged by impact or the primary coil 102 and secondary coil 103 being damaged by overload current, so it can have a permanent life.

[0049] The elliptical magnetic core 104 used in the electromagnetic wave shielding filter in this embodiment is made of ferrite material due to its excellent high-frequency characteristics and high magnetic permeability. ZnMn type ferrite material can be used in lower frequency bands due to its high conductivity (around tens of ohms), while NiMn type ferrite material can be used in even higher frequency bands due to its low conductivity (tens of megohms) and high magnetic permeability.

[0050] Furthermore, the electromagnetic wave shielding filter described herein relates to electromagnetic wave shielding filters for high-frequency signals. However, when a stacked iron core, which replaces the ferrite core, is applied to an elliptical core, it can be used as an electromagnetic wave shielding filter for 50Hz or 60Hz wires. Moreover, due to the elliptical core structure, the spacing between the primary and secondary coils becomes larger, and the transmission efficiency decreases. However, the electromagnetic wave shielding characteristics can be guaranteed. Therefore, it can be applied as needed.

[0051] like Figure 2 As shown, electromagnetic wave shielding filters are difficult to achieve electromagnetic wave shielding on their own. Structurally, the walls or roof of the shielding facility 207 abut against the filter housing 201, and all six sides can be used within the shielding facility being blocked. Currently constructed shielding facilities are all filters built with this structure and used in such facilities.

[0052] When forming elliptical (circular) magnetic core shielding and through-holes, ZnMn-type ferrite is used as the elliptical magnetic core. Due to the high conductivity (low impedance, tens of ohms) of the ferrite brick itself, even with core holes, it can still maintain an equivalent blocking state from an electromagnetic wave perspective. Furthermore, when applying elliptical magnetic cores to NiMn-type ferrite, from an electromagnetic wave perspective, the holes penetrating the core might be considered as structures with damaged electromagnetic wave shielding. However, as shown in Table 1, this problem can be solved by adjusting the diameter (d, 306) and depth (g, 307) of the holes. Moreover, the ferrite material itself has the function of absorbing electromagnetic waves; therefore, even with holes, it will not affect whether the electromagnetic wave shielding is damaged.

[0053] Figure 8 The diagram shows a honeycomb structure used in the ventilation section of an electromagnetic wave shielding facility. This component allows for ventilation, but electromagnetic waves are shielded, despite having physical perforations. Figure 8 However, electromagnetic waves can be shielded within the cutoff frequency of the cellular structure.

[0054] The table below shows the calculation formula for the electromagnetic wave shielding effect based on the diameter and depth of the honeycomb structure of the electromagnetic wave shielding facility. It can be seen that the electromagnetic wave shielding effect will vary depending on whether the physical shape of the through-hole is quadrilateral, circular, or hexagonal. However, the diameter (d) and depth (d) of the through-hole are basically adjusted (see reference). Figure 3 and Figure 8 Therefore, even with holes that impair electromagnetic wave shielding, electromagnetic wave shielding can still be achieved below the shielding frequency.

[0055]

[0056] [Table 1]

[0057] For example, when the depth (d) of a hexagonal honeycomb is 20 mm and the longest diameter is 3 mm, the shielding effect can be maintained at 96 dB at 18 GHz. Therefore, even with holes, electromagnetic wave shielding can be achieved below the cutoff frequency determined by the depth and diameter of the holes.

[0058] Therefore, when using NiMn-type ferrites, due to their low conductivity (high impedance material), even with holes in the electromagnetic wave layer, their structure can maintain the electromagnetic wave shielding in an undamaged state.

[0059] According to this embodiment, the electromagnetic wave shielding filter ( Figure 1 This type of filter does not require the capacitive (capacitor) and inductive (inductor) components needed in traditional low-pass or band-pass filter structures. In particular, it does not require protection against external high-pulse shocks, such as surge protectors or EMP protection devices 926. Electromagnetic wave shielding filter ( Figure 9 The internal components of this type of filter have a limited lifespan and require periodic replacement, resulting in time and cost losses. Compared to this type of low-pass filter, the biggest advantage of the electric field transmission filter is its full-band electromagnetic shielding effect of over 100dB. It even maintains electromagnetic shielding in the passband where signals can pass through, without a separate passband for electromagnetic shielding. Furthermore, the portion surrounding the primary and secondary coils and the elliptical core incorporates electrical short-circuit and shielding structures within its internal structure, minimizing the release or coupling of electric fields and thus maintaining electromagnetic shielding between the primary and secondary windings.

[0060] Figure 3 The side and longitudinal sections of the electromagnetic wave shielding filter including the elliptical (circular) magnetic core of this embodiment are shown, indicating the diameter and depth of the through-hole in the magnetic core.

[0061] The electromagnetic wave shielding filter including the elliptical (circular) magnetic core 304 of this embodiment ( Figure 3 The electromagnetic wave shielding filter includes an elliptical magnetic core 304, a primary coil 302, a secondary coil 303, a core shielding and penetration section 305, and an outer casing 301. (The electromagnetic wave shielding filter is included in this description.) Figure 3 The components of ) are not necessarily subject to this limitation.

[0062] Figure 4 An electromagnetic wave shielding filter comprising a dual elliptical (circular) magnetic core is shown according to this embodiment.

[0063] According to this embodiment, an electromagnetic wave shielding filter ( Figure 4It consists of two elliptical magnetic cores 404, two primary coils 402, two secondary coils 403, and a magnetic core shield and through-hole 405. In digital communications such as Ethernet, to transmit high-frequency signals into the shielded facility, separate transmitting and receiving units are constructed to simultaneously perform transmission and reception. This includes electromagnetic wave shielding filters (…). Figure 4 The components of ) are not necessarily subject to this limitation.

[0064] Figure 5 An electromagnetic wave shielding filter comprising an elliptical (circular) magnetic core is shown according to this embodiment.

[0065] According to this embodiment, an electromagnetic wave shielding filter including an elliptical (circular) core ( Figure 5 The device comprises an elliptical (circular) magnetic core 504, a coaxial cable 508 acting as a primary coil, a loop antenna 502 at the termination, a coaxial cable 509 acting as a secondary coil, a loop antenna 503 at the termination, a magnetic core shield, and a through-hole 505. Its transmission characteristics decrease at low frequencies, but its transmission efficiency needs improvement in frequencies higher than the coil's. Loop antennas 502 and 503 are fabricated by winding coaxial cables 508 and 509 around the magnetic core and electrically connecting the inner cores of coaxial cables 508 and 509 to their shielding surfaces, thus achieving the same function as the primary and secondary coils. Furthermore, the frequency range covered is several hundred MHz to several GHz, and connections can be made using SMA or N-type RF connectors 506 and 507 and cables 508 and 509. Components including electromagnetic wave shielding filters are not necessarily limited to this.

[0066] Figure 7The illustration shows the case where a hollow core replaces the ferrite core, one of the features mentioned above. Ferrite materials are easy to operate in the frequency band below 1 GHz, but it is difficult to meet the magnetic field transmission characteristics above 1 GHz. Therefore, when a hollow core replaces the ferrite core, significantly higher frequency characteristics, similar to those in the GHz band, can be obtained. This can be used to allow signals in a specific GHz band to pass through while shielding electromagnetic waves across the entire frequency band. Even within the RF passband, it can shield external electromagnetic waves. Common-mode external electromagnetic noise, acting as radiating electromagnetic waves, can be transmitted from the primary side to the secondary side due to the magnetic field transmission structure shown in Equation 1. The primary coaxial cable 708 and the secondary coaxial cable 709 are connected to connectors 706 and 707 on the outside of the electromagnetic wave shielding filter housing 701. The middle part consists of a small loop antenna structure, which is constructed by connecting the inner core of the coaxial cable to the grounding part of the outer shell. The primary loop antenna 702 and the secondary loop antenna 703 are electrically non-short-circuited and are configured facing each other. The magnetic field generated when the input RF signal passes through the primary loop antenna 702 is transmitted to the secondary loop antenna 703 in the form of a magnetic field signal, and the secondary loop antenna 703 operates by receiving this magnetic field signal. The core shielding surrounding the primary and secondary loop antennas and the small loop antenna portion are electrically isolated. Furthermore, within this space, from an electric field perspective, the loop antenna itself is short-circuited, and no electric field release or coupling occurs. Therefore, the primary and secondary ends inside and outside the shielding chamber are electrically short-circuited, resulting in complete isolation of the entire frequency band in the electric field. Only in response to specific corresponding frequency bands of the primary loop antenna 702 and the secondary loop antenna 703 does local electromagnetic wave loss occur in the form of a magnetic field on the primary and secondary sides, but the primary and secondary ends are connected (within 3dB).

[0067] Figure 8 A simplified diagram of the honeycomb structure installed in the ventilation opening portion of this electromagnetic wave shielding facility is shown, illustrating the diameter (g, 802) and depth (d, 803) of the holes. These two parameters determine the electromagnetic wave shielding effectiveness, enabling electromagnetic wave shielding to be achieved below a specific cutoff frequency even with electromagnetic openings.

[0068] Figure 9 This diagram illustrates a commonly used low-pass filter-type electromagnetic wave shielding filter for high-frequency signal lines. As shown, it consists of inductors 920 and 921, capacitors 923, 924, and 925, and a surge protector 925. Signals input to the filter can only pass below a specific cutoff frequency, while those above are shielded. Depending on the situation, it is sometimes used in conjunction with a band-pass filter or a high-pass filter. However, if there are interfering signals or high-output signals input into the passband of the shielding filter, they can pass through the filter and be transmitted through the output, potentially damaging equipment within the shielding system.

[0069] The above description merely illustrates the technical concept of this embodiment. Those skilled in the art can make various modifications and variations without departing from the essential characteristics of this embodiment. Therefore, this embodiment is not a limitation but a description, and the technical concept of this embodiment is not limited by this embodiment. The interpretation of the scope of protection of this embodiment should be based on the appended claims, which should be interpreted as including all technical concepts within the same scope within the scope of this embodiment.

Claims

1. An electromagnetic wave shielding filter, characterized in that: It consists of an elliptical ferrite core located in the center of an electromagnetic wave shielding filter. include: The primary coil and the secondary coil are symmetrically positioned opposite each other with the elliptical ferrite core as the center. A primary coil, which is wound around the elliptical core; The secondary coil is wound around the elliptical core; The magnetic core shield and through portion surrounds the elliptical magnetic core; The outer casing of the electromagnetic wave shielding filter includes a magnetic core shield and a through-hole. The magnetic core shield and through-hole surface-contacts the primary coil, the secondary coil, the elliptical ferrite core, and the magnetic core, and abuts against the inner surface of the shielding filter. The magnetic core shielding and penetration section is grounded and shielded by the internal wall of the outer casing of the electromagnetic wave shielding filter. The inner wall of the outer casing of the electromagnetic wave shielding filter is filled with the material of the magnetic core shielding and through-hole to allow high-frequency signals (RF) to pass through while shielding other radioactive common-mode electromagnetic waves.

2. The electromagnetic wave shielding filter according to claim 1, characterized in that: By using the elliptical magnetic core, which has excellent high-frequency characteristics and high permeability, the signal is transmitted in the form of a magnetic field. At the same time, the magnetic core shielding and the through-hole are used to achieve electromagnetic shielding of the magnetic core's periphery, thereby maintaining electromagnetic shielding between the primary coil and the secondary coil.

3. The electromagnetic wave shielding filter according to claim 2, characterized in that: The magnetic core uses an elliptical ferrite core.

4. The electromagnetic wave shielding filter according to claim 1, characterized in that: It further includes holes formed on the magnetic core shield and through portion. By adjusting the diameter and depth of the hole, electromagnetic wave shielding at or below the shielding frequency can be achieved.

5. The electromagnetic wave shielding filter according to claim 2, characterized in that: The magnetic core shielding and penetration section is composed of a material including iron or copper fluff.

6. The electromagnetic wave shielding filter according to claim 2, characterized in that: The high-frequency signal (RF) is transmitted from the primary end to the secondary end through the configuration of multiple windings of the primary and secondary coils in the elliptical magnetic core.

7. The electromagnetic wave shielding filter according to claim 2, characterized in that: The elliptical magnetic core is wound around a coaxial cable that replaces the primary and secondary coils. The cable is wound in a loop antenna shape with one or more loops to transmit high-frequency signals (RF) from the primary end to the secondary end.

8. The electromagnetic wave shielding filter according to claim 2, characterized in that: The elliptical magnetic core is replaced by a hollow (Air) core, and the coaxial cable terminal is wound with a loop antenna structure that replaces the primary and secondary coils, forming a loop antenna structure with the surfaces facing each other, transmitting high-frequency signals (RF) from the primary end to the secondary end.

9. The electromagnetic wave shielding filter according to claim 2, characterized in that: The magnetic core uses an elliptical, stacked iron core.

Images