JP2012227352A - High-frequency transformer, high-frequency component, and communication terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To configure a low-loss high-frequency transformer capable of obtaining stronger coupling even when the high-frequency transformer is miniaturized and thinned, and to configure a high-frequency component and a communication terminal device having the same.SOLUTION: A coil winding axis of a primary side coil element L10 and coil winding axes of secondary side coil elements L211 and L221 are a common coil winding axis AX1. Winding directions and connection directions of these coil elements are defined so that a direction of a magnetic flux generated by the primary side coil element L10 and a direction of a magnetic flux generated by the secondary side coil elements L211 and L221 become reverse to each other. In addition, winding directions and connection directions of the secondary side coil elements L211, L212, L221 and L222 are defined so that a magnetic flux passing through the adjacent secondary side coil elements L211 and L212 forms a closed loop and a magnetic flux passing through the secondary side coil elements L221 and L222 forms a closed loop.

Description

  The present invention relates to a high-frequency transformer in which coil elements are coupled with a high degree of coupling, a high-frequency component including the same, and a communication terminal device.

  In a circuit for wireless communication, a high frequency transformer is used to perform impedance conversion, impedance matching, balanced-unbalanced conversion, and the like. A small communication terminal device such as a portable terminal device requires a high-frequency transformer that is small, thin, and low loss.

  As a small-sized high frequency transformer, for example, as disclosed in Patent Document 1 and Patent Document 2, one constituted by a multilayer substrate is used. Patent Document 3 discloses an example of a balun (balun trance).

Japanese Utility Model Publication No.59-44002 Japanese Patent Application Laid-Open No. 2004-63952 JP 2008-167403 A

  However, in the high-frequency transformers disclosed in Patent Documents 1 to 3, when the size of the product is reduced as a whole as the product is reduced in size and thickness, the confinement property of the magnetic flux of the coil formed on the laminated substrate is reduced, and the loss is reduced. There has been a problem of increasing.

  Accordingly, an object of the present invention is to provide a high-frequency transformer, a high-frequency component including the same, and a communication terminal device that can obtain stronger coupling even when the high-frequency transformer is reduced in size and thickness.

The high-frequency transformer of the present invention is
A primary coil element having one or a plurality of coil winding axes and a secondary coil element having a plurality of coil winding axes parallel to each other;
The coil winding axis of the primary side coil element is a common coil winding axis that matches the coil winding axis of the secondary side coil element,
The primary coil element and the secondary coil element are arranged so as to have two or more boundaries between the primary coil element and the secondary coil element on the common coil winding axis,
The first secondary coil element and the second secondary coil element arranged on the adjacent coil winding axis among the plurality of coil winding axes are connected in series, and the first 2 The winding direction and connection of the first secondary coil element and the second secondary coil element so that the magnetic flux passing through the secondary coil element and the second secondary coil element forms a closed loop. It is characterized by its orientation.

The high frequency component of the present invention includes a high frequency transformer,
The high-frequency transformer is
A primary coil element having one or a plurality of coil winding axes and a secondary coil element having a plurality of coil winding axes parallel to each other;
The coil winding axis of the primary side coil element is a common coil winding axis that matches the coil winding axis of the secondary side coil element,
The primary coil element and the secondary coil element are arranged so as to have two or more boundaries between the primary coil element and the secondary coil element on the common coil winding axis,
The first secondary coil element and the second secondary coil element arranged on the adjacent coil winding axis among the plurality of coil winding axes are connected in series, and the first 2 The winding direction and connection of the first secondary coil element and the second secondary coil element so that the magnetic flux passing through the secondary coil element and the second secondary coil element forms a closed loop. It is characterized by its orientation.

The communication terminal device of the present invention comprises a high-frequency transformer in the communication signal transmission unit,
The high-frequency transformer is
A primary coil element having one or a plurality of coil winding axes and a secondary coil element having a plurality of coil winding axes parallel to each other;
The coil winding axis of the primary side coil element is a common coil winding axis that matches the coil winding axis of the secondary side coil element,
The primary coil element and the secondary coil element are arranged so as to have two or more boundaries between the primary coil element and the secondary coil element on the common coil winding axis,
The first secondary coil element and the second secondary coil element arranged on the adjacent coil winding axis among the plurality of coil winding axes are connected in series, and the first 2 The winding direction and connection of the first secondary coil element and the second secondary coil element so that the magnetic flux passing through the secondary coil element and the second secondary coil element forms a closed loop. It is characterized by its orientation.

  According to the present invention, since a coil with low loss and high inductance is provided even if it is reduced in size and thickness, a high-frequency transformer that is small and thin and has low loss, a high-frequency component including the same, and a communication terminal device can be obtained. Further, by arranging and connecting a plurality of coil elements so that the magnetic flux forms a closed loop between adjacent coil elements, the magnetic flux density of the coil can be further increased, and a high-frequency transformer having a high coupling degree and a high-frequency transformer provided with the high-frequency transformer Parts and a communication terminal device are obtained.

FIGS. 1A and 1B are circuit diagrams of the high-frequency transformers 101A and 101B according to the first embodiment. FIG. 2 is a diagram illustrating a layer configuration in which the high-frequency transformer of FIG. 1A is configured by conductor wiring in a multilayer substrate. 3A and 3B are circuit diagrams of the high-frequency transformers 102A and 102B according to the second embodiment. FIG. 4 is a circuit diagram of the high-frequency transformer 103 of the third embodiment. FIGS. 5A, 5B, 5C, and 5D are circuit diagrams of the high-frequency transformers 104A, 104B, 104C, and 104D of the fourth embodiment. FIG. 6 is a diagram showing a layer configuration in which the high-frequency transformer of FIG. 5A is configured by conductor wiring in the multilayer substrate. FIG. 7 is a circuit diagram of the high-frequency transformer 105 of the fifth embodiment. FIG. 8 is a configuration diagram of the high-frequency component and the communication terminal device of the sixth embodiment. FIG. 9 is a configuration diagram of the high-frequency component and the communication terminal device of the seventh embodiment.

<< First Embodiment >>
FIGS. 1A and 1B are circuit diagrams of the high-frequency transformers 101A and 101B according to the first embodiment. In these figures, the coil winding axis (hereinafter simply referred to as “winding axis”) and the winding direction are taken into consideration. (The point of drawing a circuit diagram in consideration of the winding axis and the winding direction is the same in the second and subsequent embodiments.) The high-frequency transformers 101A and 101B include five coil elements L10, L211, L212, and L221. , L222. The high-frequency transformers 101A and 101B include primary side terminals P1 and P2 and secondary side terminals P3 and P4. A coil element L10 is connected between the input terminals P1 and P2. Between the input terminals P3 and P4, a series circuit of coil elements L211 and L212 and a series circuit of coil elements L221 and L222 are connected in parallel.

  The coil element L10 is spirally wound along the winding axis AX1. The two coil elements L211 and L221 are arranged at symmetrical positions along the winding axis AX1 with the coil element L10 interposed therebetween. The two coil elements L211 and L221 are spirally wound in the winding directions opposite to each other along the winding axis AX1.

  Further, the two coil elements L212 and L222 are arranged at symmetrical positions with respect to the center of the winding axis AX2. The two coil elements L212 and L222 are spirally wound along the winding axis AX2 in mutually opposite winding directions.

  The winding axis AX1 is a common winding axis for the coil elements L10, L211 and L221. The primary side so that the boundary between the primary side coil element L10 and the secondary side coil element L211 and the boundary between the primary side coil element L10 and the secondary side coil element L221 are generated on the common coil winding axis AX1. Coil element L10 and secondary coil elements L211 and L221 are arranged. In the present invention, the “boundary” is a region sandwiched between adjacent coil elements on the coil winding axis. And the coil element and coil element which adjoin at this boundary mutually interact.

  The mutual induction of the primary coil element L10 and the secondary coil elements L211 and L221 causes the directions of the magnetic flux generated by the primary coil element L10 and the magnetic flux generated by the secondary coil elements L211 and L221 to be opposite to each other. In addition, the winding direction and connection direction of the primary side coil element L10 and the secondary side coil elements L211 and L221 are determined.

  The arrows in FIGS. 1A and 1B indicate the directions of currents i1 and i2 flowing from the terminal P1 to the terminal P2 and from the terminal P3 to the terminal P4, respectively. The direction of this current represents the phase (polarity) of the high-frequency current. In FIG. 1B, the winding direction of the coil between the terminals P3 and P4 is reversed with respect to FIG. In this case, the direction of the magnetic field becomes the same as that in FIG. 1A by making the direction of the current flowing through the terminals P3-P4 opposite, that is, by making the phase of the current 180 degrees different from the terminals P1-P2.

  In the example of FIG. 1A and FIG. 1B, the magnetic flux generated in the secondary coil elements L211 and L221 is upward at the moment when the magnetic flux generated in the primary coil element L10 is directed downward. At any timing when the magnetic field changes, the direction of the magnetic flux generated in the primary side coil element L10 and the secondary side coil elements L211 and L221 is reversed. That is, at the interface between the primary side coil element and the secondary side coil element, the magnetic flux acts to repel (retreat) each other, so that the magnetic flux density around each coil element increases. That is, an effect as if the magnetic flux was confined in the magnetic material can be brought about. In particular, when affected by opposite magnetic fluxes at both ends of the coil, the effect of confining the magnetic flux of each coil is enhanced, and the magnetic flux density can be increased.

  In addition, according to the first embodiment, the coil elements L211 and L212 and the coil elements L221 and L222 connected in series have their coil elements oriented so that the directions of magnetic fluxes are opposite to each other. ing. For this reason, the magnetic flux circulates between adjacent coil elements to strengthen each other. For this reason, a coil having a higher confinement effect and less loss can be formed, and the amount of coupling between the primary side and the secondary side can be increased.

  Further, according to the first embodiment, since the current flowing through each coil element is symmetrical with respect to the center of the winding axes AX1 and AX2, parasitic capacitance and parasitic inductance are balanced with respect to the terminals P1 to P4. Therefore, the influence of these parasitic components is effectively counteracted.

  FIG. 2 is a configuration diagram when the high-frequency transformer of FIG. 1A is configured as a chip component. The chip component is configured by forming a conductor wiring in the laminated substrate. FIG. 2 is an exploded perspective view of the laminated substrate. This laminated substrate is a laminated body of a dielectric or magnetic base material layer including a predetermined conductor pattern. As shown in FIG. 2, conductor patterns 211c and 212c are formed on the uppermost substrate layer 51a, conductor patterns 211b and 212b are formed on the second substrate layer 51b, and the third substrate layer 51c is formed. Conductor patterns 211a and 212a are formed on the substrate. The conductive pattern 10a is formed on the fourth base layer 51d, the conductive pattern 10b is formed on the fifth base layer 51e, and the conductive pattern 10c is formed on the sixth base layer 51f. Conductive patterns 221a and 222a are formed on the seventh base layer 51g, conductive patterns 221b and 222b are formed on the eighth base layer 51h, and conductive patterns 221c and 222c are formed on the ninth base layer 51i. Is formed. Terminal electrodes 61, 62, 63, 64 are formed on the back surface of the tenth substrate layer 51j. A plain base material layer (not shown) is laminated on the upper part of the uppermost base material layer 51a.

The terminal electrodes 61, 62, 63 and 64 correspond to the terminals P1, P2, P3 and P4 shown in FIG.
Conductive patterns 10a, 10b, and 10c correspond to coil element L10.

The conductor patterns 211a, 211b, and 211c correspond to the coil element L211 and the conductor patterns 212a, 212b, and 212c correspond to the coil element L212.
The conductor patterns 221a, 221b, and 221c correspond to the coil element L221, and the conductor patterns 222a, 222b, and 222c correspond to the coil element L222.

  A ground conductor 65 is formed on the base material layer 51j. Since the ground conductor 65 is disposed between the coil element having the plurality of conductor patterns and the circuit at the mounting destination, the plurality of conductor patterns are shielded from the circuit at the mounting destination by the ground conductor 65. . However, this ground conductor is not essential. If the shielding of the coil element is unnecessary in the state of the chip component, the ground conductor is unnecessary.

  A line extending in the vertical direction in FIG. 2 is an interlayer connection conductor (via conductor), which connects the conductor pattern and the conductor pattern, and connects the conductor pattern and the terminal electrode.

  Each conductive pattern can be formed using a conductive material such as silver or copper as a main component. For the base material layers 51a to 51j, a glass ceramic material or an epoxy resin material can be used if it is a dielectric, and a ferrite ceramic material or a resin material containing ferrite is used if it is a magnetic material. it can. As a material for the base layer, it is preferable to use a dielectric material when forming a high-coupling transformer for the UHF band, and when forming a high-coupling transformer for the HF band, a magnetic material is preferably used. It is preferable to use it.

  As shown in FIG. 2, the coil elements L10, L211 and L221 of the respective conductor patterns are arranged so that their coil winding axes coincide (the coil winding axes are the same straight line, and the coil elements L10, L211 and L221 are the same). Are arranged in a coaxial relationship. The coil elements L212 and L222 are arranged so that their coil winding axes coincide with each other (so that the coil winding axes are the same straight line and the coil elements L10, L211 and L221 are in a coaxial relationship). Yes. That is, each conductor pattern is formed on the base material layer so that the coil winding axis is perpendicular to the main surface of the laminate.

  According to the embodiment shown above, in addition to the confinement effect due to the direction of the magnetic flux between the primary and secondary sides, the magnetic flux passing through the adjacent secondary coil element forms a closed loop, so that even if it is thin, the inductance A large and low loss coil can be obtained. Therefore, it is possible to realize a transformer that is smaller and thinner than conventional ones and has a small loss and a large coupling amount between the primary and secondary sides.

<< Second Embodiment >>
3A and 3B are circuit diagrams of the high-frequency transformers 102A and 102B according to the second embodiment. The high-frequency transformers 102A and 102B have three winding axes AX1, AX2, and AX3 that are parallel to each other.

  In the example of FIG. 3A, the high-frequency transformer 102A includes a primary side coil element L10 and secondary side coil elements L211, L212, L213, L221, L222, and L223. In the example of FIG. 3B, the high frequency transformer 102B includes primary side coil elements L11 and L12 and secondary side coil elements L211, L212, L213, L221, L222, and L223.

  The direction of the primary-secondary magnetic flux and the direction of the magnetic flux between adjacent coils are the same as those shown in the first embodiment. Thus, even if there are three or more winding shafts, the same effect can be obtained by continuing the same configuration.

  According to the second embodiment, since the primary side coil element and the secondary side coil element are arranged vertically and horizontally symmetrically, parasitic capacitance and parasitic inductance are attached to the terminals P1 to P4 in a more balanced manner. As a result, the effects of these parasitic components are effectively counteracted.

  In addition, when there are three or more winding axes, the coil element disposed inside the laminated body is closer to the center of the plurality of winding axes (AX1, AX2, AX3) as shown in FIG. Providing along the winding axis (AX2) is effective in that leakage of magnetic flux from the inner coil element (L10) is further suppressed.

<< Third Embodiment >>
FIG. 4 is a circuit diagram of the high-frequency transformer 103 of the third embodiment. The high-frequency transformer 103 has a plurality of coil elements arranged three-dimensionally. In this example, there are four winding axes AX11, AX12, AX21, and AX22 that are parallel to each other, and the surface that includes the winding axes AX11 and AX12 is parallel to the surface that includes the winding axes AX21 and AX22. Further, the plane including the winding axes AX11 and AX21 and the plane including the winding axes AX12 and AX22 are parallel. Further, in this example, the plane including the winding axes AX11 and AX12 and the plane including the winding axes AX11 and AX21 are orthogonal to each other.

  One set of transformers is constituted by coil elements arranged along the winding axes AX11, AX12, and another set of transformers is constituted by coil elements arranged along the winding axes AX21, AX22. Two sets of transformers are connected in parallel to terminals P1-P2 and to terminals P3-P4, respectively.

  The coil elements are arranged so that the arrangement of the coil elements is 180-degree rotationally symmetric with respect to virtual center axes parallel to the winding axes AX11, AX12, AX21, and AX22. That is, the primary side coil element L11 and the secondary side coil elements L2111 and L2211 are arranged on the winding axis AX11, and the secondary side coil elements L2121 and L2221 are arranged on the winding axis AX12. Similarly, the primary side coil element L12 and the secondary side coil element L2112, L2212 are arrange | positioned at winding axis AX22, and the secondary side coil element L2122, L2222 is arrange | positioned at winding axis AX21.

  According to the third embodiment, since many coil elements can be arranged in a limited space, a smaller, thinner and lower loss high frequency transformer can be configured.

  Further, parasitic capacitance and parasitic inductance are attached to the terminals P1 to P4 in a well-balanced manner, and the influence of these parasitic components is effectively canceled out.

<< Fourth Embodiment >>
FIGS. 5A, 5B, 5C, and 5D are circuit diagrams of the high-frequency transformers 104A, 104B, 104C, and 104D of the fourth embodiment. In any case, vertical ground electrodes G1 and G2 are provided and grounded on the extended lines of a plurality of winding shafts.

  5A shows an example in which ground electrodes G1 and G2 are provided in the high-frequency transformer shown in FIG. 1A, and FIG. 5B shows ground electrodes G1 and G2 in the high-frequency transformer shown in FIG. FIG. 5C shows an example in which ground electrodes G1 and G2 are provided in the high frequency transformer shown in FIG. 3B. FIG. 5D shows an example in which ground electrodes G1 and G2 are provided in the high-frequency transformer shown in FIG.

  With this structure, the parasitic capacitance between the secondary coil element and the ground increases as compared with the parasitic capacitance between the primary coil element and the ground. By determining the distance between the ground electrodes G1 and G2 and the secondary coil element, the value of the parasitic capacitance can be set. By determining the parasitic capacitance and intentionally changing the frequency characteristics of the primary side coil element and the secondary side coil element, the impedance conversion ratio can have the frequency characteristic.

  FIG. 6 is a diagram showing a layer configuration in which the high-frequency transformer of FIG. 5A is configured by conductor wiring in the multilayer substrate. In FIG. 6, a ground electrode 66 is formed on the base material layer 51m, and a ground electrode 67 is formed on the base material layer 51n. The ground electrodes 65, 66, and 67 are electrically connected via via conductors.

  Both of the ground electrodes 66 and 67 may be disposed on the inner layer of the laminate, or both may be disposed on the outer surface.

  Thus, by intentionally changing the frequency characteristics of the primary side coil element and the secondary side coil element, the impedance conversion ratio can be changed according to the frequency, and the optimum impedance matching is achieved over a wide band. be able to. An example of a circuit connected to the front stage and the rear stage of the high-frequency transformer will be described in another later embodiment.

<< Fifth Embodiment >>
FIG. 7 is a circuit diagram of the high-frequency transformer 105 of the fifth embodiment. In the high-frequency transformer 105, the intermediate point between the secondary coil elements L211 and L212 and the intermediate point between the secondary coil elements L221 and L222 are grounded to the ground electrodes G1 and G2, respectively. Other configurations are the same as the example shown in FIG.

  In this way, by grounding the intermediate point of the secondary coil element, it can be applied to a balanced-unbalanced conversion circuit as it is, as will be described later.

<< Sixth Embodiment >>
FIG. 8 is a configuration diagram of the high-frequency component and the communication terminal device of the sixth embodiment. The communication terminal device shown in FIG. 8 includes a high frequency circuit 201, a matching circuit 202, a high frequency component 203, a matching circuit 204, and an antenna 205. The high-frequency component 203 is provided as an impedance conversion circuit that performs impedance matching between the impedance of the transmission line on the high-frequency circuit 201 side and the impedance of the antenna 205. The basic configuration of the high-frequency component 203 is the same as that of the high-frequency transformer 104A shown in FIG. A terminal P1 of this high frequency transformer is used as an input / output terminal on the high frequency circuit 201 side, and a terminal P3 is used as a ground terminal. Terminals P2 and P4 are connected and used as an input / output terminal on the antenna 205 side.

  As described in the fourth embodiment, the high-frequency component 203 can intentionally change the frequency characteristics of the primary side coil element and the secondary side coil element, so that the impedance conversion ratio depends on the frequency. Can be changed. When the impedance of the antenna 205 changes according to the frequency, the impedance conversion ratio of the high-frequency component 203 has a frequency characteristic in accordance with the frequency characteristic of the impedance of the antenna, so that optimum impedance matching can be achieved over a wide band. it can.

<< Seventh Embodiment >>
FIG. 9 is a configuration diagram of the high-frequency component and the communication terminal device of the seventh embodiment. The communication terminal device shown in FIG. 9 includes a high frequency circuit 201, a high frequency component 206, a filter 207, and an antenna 205. The high-frequency component 206 is provided as a balanced-unbalanced conversion circuit that converts a balanced signal on the high-frequency circuit 201 side and an unbalanced signal on the antenna 205 side. The basic configuration of the high-frequency component 206 is the same as that of the high-frequency transformer 101A shown in FIG. A terminal P1 of this high frequency transformer is used as an input / output terminal on the antenna 205 side, and a terminal P2 is used as a ground terminal. Terminals P3 and P4 are used as input / output terminals for balanced signals on the high-frequency circuit 201 side.

  By configuring the high-frequency component 206 that performs balanced-unbalanced conversion as described above with the laminated substrate as shown in FIG. 1A, a balun that is thinner, smaller, and lower in loss than the prior art can be configured.

  In each of the embodiments described above, the number of turns of the coil shown in the configuration diagram of the laminated body is naturally an example, and the number of turns of each coil element is not limited to that shown in these drawings.

AX1, AX2, AX3 ... Coil winding axes AX11, AX12, AX21, AX22 ... Coil winding axes G1, G2 ... Ground electrodes L10 ... Primary coil elements L11, L12 ... Primary coil elements L211, L212, L213 L2211, L222, L223 ... Secondary coil elements L2111, L2211 ... Secondary coil elements L2121, L2221 ... Secondary coil elements L2112, L2212 ... Secondary coil elements L2122, L2222 ... Secondary coil elements P1, P2 , P3, P4 ... terminals 10a, 10b, 10c ... conductor patterns 51a to 51k ... base material layers 51m, 51n ... base material layers 61, 62, 63, 64 ... terminal electrodes 65, 66, 67 ... ground electrodes 101A, 101B ... High frequency transformers 102A, 102B ... High frequency transformer 103 ... High frequency transformer 1 4A, 104B, 104C, 104D ... high frequency transformer 105 ... high frequency transformer 201 ... high frequency circuit 202, 204 ... matching circuit 203, 206 ... high frequency component 205 ... antenna 207 ... filter 211a, 211b, 211c ... conductor pattern 212a, 212b, 212c ... Conductor patterns 221a, 221b, 221c ... Conductor patterns 222a, 222b, 222c ... Conductor patterns

Claims (6)

A primary coil element having one or a plurality of coil winding axes and a secondary coil element having a plurality of coil winding axes parallel to each other;
The coil winding axis of the primary side coil element is a common coil winding axis that matches the coil winding axis of the secondary side coil element,
The primary coil element and the secondary coil element are arranged so as to have two or more boundaries between the primary coil element and the secondary coil element on the common coil winding axis,
The first secondary coil element and the second secondary coil element arranged on the adjacent coil winding axis among the plurality of coil winding axes are connected in series, and the first 2 The winding direction and connection of the first secondary coil element and the second secondary coil element so that the magnetic flux passing through the secondary coil element and the second secondary coil element forms a closed loop. A high-frequency transformer characterized in that its orientation is determined.   The primary side coil elements having the common coil winding axis or the secondary side coil elements having the common coil winding axis have opposite winding directions and reverse current directions. The high-frequency transformer according to claim 1, connected in such a manner.   The primary side coil element and the secondary side coil element are configured by a conductor pattern disposed in a laminated body in which a plurality of dielectric layers or magnetic layers are laminated and via conductors connecting the layers, and the coil winding The high-frequency transformer according to claim 1 or 2, wherein the conductor pattern and the via conductor are arranged so that a rotation axis is perpendicular to a main surface of the multilayer body.   The high frequency transformer according to any one of claims 1 to 3, further comprising a ground conductor layer sandwiching the primary side coil element and the secondary side coil element on an inner layer or an outer surface of the multilayer body. In high frequency components with high frequency transformers,
The high-frequency transformer is
A primary coil element having one or a plurality of coil winding axes and a secondary coil element having a plurality of coil winding axes parallel to each other;
The coil winding axis of the primary side coil element is a common coil winding axis that matches the coil winding axis of the secondary side coil element,
The primary coil element and the secondary coil element are arranged so as to have two or more boundaries between the primary coil element and the secondary coil element on the common coil winding axis,
The first secondary coil element and the second secondary coil element arranged on the adjacent coil winding axis among the plurality of coil winding axes are connected in series, and the first 2 The winding direction and connection of the first secondary coil element and the second secondary coil element so that the magnetic flux passing through the secondary coil element and the second secondary coil element forms a closed loop. A high-frequency component characterized by its orientation. In a communication terminal device equipped with a high-frequency transformer in the communication signal transmission unit,
The high-frequency transformer is
A primary coil element having one or a plurality of coil winding axes and a secondary coil element having a plurality of coil winding axes parallel to each other;
The coil winding axis of the primary side coil element is a common coil winding axis that matches the coil winding axis of the secondary side coil element,
The primary coil element and the secondary coil element are arranged so as to have two or more boundaries between the primary coil element and the secondary coil element on the common coil winding axis,
The first secondary coil element and the second secondary coil element arranged on the adjacent coil winding axis among the plurality of coil winding axes are connected in series, and the first 2 The winding direction and connection of the first secondary coil element and the second secondary coil element so that the magnetic flux passing through the secondary coil element and the second secondary coil element forms a closed loop. A communication terminal device characterized in that a direction is determined.

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