JP5316213B2 - Coaxial line and coaxial connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coaxial line and a coaxial connector wherein reflection of a signal can be suppressed in a wide frequency band. <P>SOLUTION: An internal conductor 14a extends inside an external conductor 12a and has an outer diameter r1. An internal conductor 14b extends inside an external conductor 12b and has an outer diameter r2 smaller than the outer diameter r1. An internal conductor 14c extends inside the external conductor 12a and has an outer diameter r3 which is smaller than the outer diameter r1 and larger than the outer diameter r2. An internal conductor 14d extends inside the external conductor 12a and is the internal conductor having an outer diameter r4 equal to the outer diameter r2 and is provided between the internal conductor 14b and the internal conductor 14c. The characteristic impedance Z1 of a region A1 is equal to the characteristic impedance Z2 of a region A2 and is smaller than the characteristic impedance Z3 of a region A3 and the characteristic impedance Z4 of a region A4. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a coaxial line and a coaxial connector, and more particularly to a coaxial line and a coaxial connector including a cylindrical outer conductor and an inner conductor extending in the outer conductor.

  An example of a conventional common coaxial connector is shown in FIG. FIG. 9 is a cross-sectional structure diagram of a conventional coaxial connector 510. FIG. 4B is a diagram showing electric lines of force generated in the coaxial connector 510. FIG. 6 is an equivalent circuit diagram of the coaxial connector 510.

  The coaxial connector 510 includes an outer conductor 512, an inner conductor 514, and an insulator 516, as shown in FIG.

  The outer conductor 512 includes outer conductors 512a and 512b, and is applied with a ground potential. The outer conductor 512a is a cylinder having an inner diameter R11. The outer conductor 512b is a cylinder connected to the outer conductor 512a and having an inner diameter R12 smaller than the inner diameter R11.

  The inner conductor 514 includes inner conductors 514a, 514b, and 514c, and transmits a high frequency signal. The inner conductor 514a is a cylinder having an outer diameter r11 and extends in the outer conductor 512a. The inner conductor 514b is a cylinder having an outer diameter r12 smaller than the outer diameter r11, and extends in the outer conductor 512b. The inner conductor 514c is a cylinder having an outer diameter r12, is connected to the inner conductors 514a and 514b, and extends through the outer conductor 512a. The insulator 516 is formed of an insulating material such as resin and is provided between the outer conductor 512 and the inner conductor 514 to insulate the outer conductor 512 and the inner conductor 514 from each other.

  The coaxial connector 510 having the above configuration is used when two coaxial lines having different outer conductor diameters are connected. Therefore, the characteristic impedance of the region A11 and the characteristic impedance of the region A12 are set so that signal reflection does not occur between the region A11 where the inner conductor 514a extends and the region A12 where the inner conductor 514b extends. Are configured to be equal. Specifically, the value of the ratio of the outer diameter r11 to the inner diameter R11 is configured to be equal to the value of the ratio of the outer diameter r12 to the inner diameter R12.

  By the way, in the coaxial connector 510, as shown in FIG. 9, the outer diameter of the inner conductor 514 is changed from the outer diameter r11 to the outer diameter r12. Therefore, the corner E10 is formed in the inner conductor 514. When the corner portion E10 is formed, as shown in FIG. 4B, the electric lines of force e10 generated from portions other than the corner portion E10 are generated radially in a direction orthogonal to the inner conductor 514, whereas The electric lines of force e11 generated from the corner E10 are generated in a direction bent from the direction orthogonal to the inner conductor 514. That is, in the regions A11 and A12 in which the inner conductors 514a and 514b extend, TM mode electromagnetic fields are generated, whereas in the region A13 in which the inner conductor 514c extends, the quasi-TM mode. The electromagnetic field is generated. The reason why the quasi-TM mode electromagnetic field is generated in the region A13 is that the capacitance component C is generated between the corner E10 and the outer conductor 512. When such a capacitive component C occurs, impedance matching between the regions A11, A12 and the region A13 is lost, and signal reflection occurs in the region A13.

  Thus, the coaxial connector 510 suppresses signal reflection by the method described below. More specifically, an equivalent circuit diagram of the coaxial connector 510 is shown in FIG. That is, the areas A11 and A12 have a characteristic impedance Z0 (for example, 50Ω). On the other hand, the region A13 has a characteristic impedance Zw larger than the characteristic impedance Z0 because the outer diameter of the inner conductor 514c is the outer diameter r12 and the outer diameter of the outer conductor 512a is the inner diameter R11. Further, a capacitance component C is generated between the boundary between the inner conductor 514 a and the inner conductor 514 c and the outer conductor 512.

  In the equivalent circuit as shown in FIG. 6A, the characteristic impedance Zw can be regarded as a characteristic impedance Z0 and an inductance component Lw connected in series. The coaxial connector 510 is designed so that the LC circuit including the inductance component Lw and the capacitance component C has a characteristic impedance equal to the characteristic impedance Z0. As a result, the occurrence of signal reflection in the region A13 is suppressed.

  Incidentally, the coaxial connector 510 is desired to suppress signal reflection in a wide frequency band.

  In addition, as a conventional coaxial connector, the coaxial connector of patent document 1 is known, for example. In the coaxial connector, it is described that an inner conductor having a relatively small diameter is disposed before and after an inner conductor having a relatively large diameter. However, in the coaxial connector described in Patent Document 1, the inner diameter of the outer conductor is constant. Therefore, Patent Document 1 does not describe a configuration for suppressing signal reflection in a wide frequency band.

Japanese Patent Laid-Open No. 7-201419

  Therefore, an object of the present invention is to provide a coaxial line and a coaxial connector that can suppress signal reflection in a wide frequency band.

A coaxial line and a coaxial connector according to an aspect of the present invention are a coaxial outer line formed of a cylindrical outer conductor, and an inner conductor extending in the outer conductor in a state of being insulated from the outer conductor, The outer conductor includes a first outer conductor having a first inner diameter, and a second outer conductor connected to the first outer conductor and having a second inner diameter smaller than the first inner diameter. A first inner conductor extending in the first outer conductor and having a first outer diameter; and in the second outer conductor. A second inner conductor extending and having a second outer diameter smaller than the first outer diameter; and extending through the first outer conductor; and A third inner conductor having a third outer diameter that is equal to or smaller than the outer diameter and larger than the second outer diameter, the third inner conductor being connected to the first inner conductor And said A fourth inner conductor extending in one outer conductor and having a fourth outer diameter that is equal to or larger than the second outer diameter and smaller than the third outer diameter, And a fourth inner conductor provided between the second inner conductor and the third inner conductor, and a first characteristic of the first region in which the first inner conductor is provided The impedance is equal to the second characteristic impedance of the second region where the second inner conductor is provided, and the third characteristic impedance of the third region where the third inner conductor is provided. and the fourth inner conductor rather smaller than the fourth of the characteristic impedance of the fourth region is provided, said third outer diameter, the first smaller than the outer diameter, said third region The sum of the length of the fourth region and the length of the fourth region is the highest frequency signal among the signals transmitted through the inner conductor. It is less than one quarter of the wavelength, and wherein.

  According to the present invention, signal reflection can be effectively suppressed in a wide frequency band.

1 is an external perspective view of a coaxial connector according to an embodiment of the present invention. FIG. 2 is a cross-sectional structure view taken along line AA of the coaxial connector of FIG. It is an external appearance perspective view of the insulator and inner conductor of the coaxial connector of FIG. FIG. 4A is a diagram showing electric lines of force generated in the coaxial connector of FIG. FIG. 4B is a diagram showing electric lines of force generated in the coaxial connector of FIG. FIG. 2 is an equivalent circuit diagram of the coaxial connector of FIG. 1. FIG. 10 is an equivalent circuit diagram of the coaxial connector of FIG. 9. It is sectional structure drawing of the coaxial connector which concerns on a modification. It is sectional structure drawing of the coaxial connector which concerns on other embodiment. It is sectional structure drawing of the conventional coaxial connector.

  Hereinafter, a coaxial connector provided with a coaxial line according to an embodiment of the present invention will be described with reference to the drawings.

(Configuration of circuit board)
Hereinafter, a configuration of a coaxial connector according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of a coaxial connector 10 according to an embodiment of the present invention. FIG. 2 is a cross-sectional structural view taken along line AA of the coaxial connector 10 of FIG. FIG. 3 is an external perspective view of the insulator 16 and the inner conductor 14 of the coaxial connector 10.

  As shown in FIG. 2, the coaxial connector 10 includes an outer conductor 12, an inner conductor 14, and an insulator 16.

  As shown in FIGS. 1 and 2, the outer conductor 12 is composed of outer conductors 12a and 12b, and is applied with a ground potential. The outer conductor 12a is a cylinder having an inner diameter R1. The outer conductor 12b is a cylinder connected to the outer conductor 12a and having an inner diameter R2 smaller than the inner diameter R1. Further, as shown in FIG. 1, threads 20a and 20b are provided on the outer peripheral surface of the outer conductor 12a and the outer peripheral surface of the outer conductor 12b, respectively. Thereby, the coaxial connector 10 is fixed to a counterpart connector (not shown).

  As shown in FIGS. 2 and 3B, the inner conductor 14 is constituted by inner conductors 14a to 14d, and a high-frequency signal is transmitted. The inner conductor 14 extends through the outer conductor 12 while being insulated from the outer conductor 12.

  The inner conductor 14a is a cylinder having an outer diameter r1, and extends in the outer conductor 12a. The inner conductor 14b is a cylinder having an outer diameter r2 smaller than the outer diameter r1, and extends in the outer conductor 12b. The inner conductor 14c is a cylinder having an outer diameter r3 that is smaller than the outer diameter r1 and larger than the outer diameter r2, and is connected to the inner conductor 14a and extends through the outer conductor 12a. The inner conductor 14d is a cylinder having an outer diameter r4 equal to the outer diameter r2, is connected between the inner conductor 14b and the inner conductor 14c, and extends in the outer conductor 12a.

  Further, as shown in FIGS. 2 and 3B, the end portion of the inner conductor 14a is processed so that the outer diameter thereof is smaller than the outer diameter r1. More specifically, a hole H1 is formed at the end of the inner conductor 14a. Thereby, the edge part of the inner conductor 14a has comprised the thin cylindrical structure. A slit S1 extending in the direction in which the inner conductor 14a extends is formed at the end of the inner conductor 14a. The slit S1 has a triangular shape as shown in FIG. 2 by pressurizing the inner conductor 14a from the vertical direction of FIG. Thereby, the outer diameter of the end portion of the inner conductor 14a is smaller than the outer diameter r1. In the inner conductor 14a having the above structure, when the inner conductor of the counterpart connector is inserted into the hole H1, the inner peripheral surface of the inner conductor 14a comes into pressure contact with the inner conductor of the counterpart connector. Thereby, the inner conductor of the counterpart connector is reliably electrically connected to the inner conductor 14a.

  Further, as shown in FIGS. 2 and 3B, the end portion of the inner conductor 14b is processed so that the outer diameter thereof is smaller than the outer diameter r2. More specifically, a hole H2 is formed at the end of the inner conductor 14b. Thereby, the end of the inner conductor 14b has a thin cylindrical structure. A slit S2 extending in the direction in which the inner conductor 14b extends is formed at the end of the inner conductor 14b. The slit S2 has a triangular shape as shown in FIG. 2 when the inner conductor 14b is pressurized from the vertical direction of FIG. 3B. Thereby, the outer diameter of the end portion of the inner conductor 14b is smaller than the outer diameter r2. In the inner conductor 14b having the above structure, when the inner conductor of the counterpart connector is inserted into the hole H2, the inner peripheral surface of the inner conductor 14b comes into pressure contact with the inner conductor of the counterpart connector. Thereby, the inner conductor of the mating connector is reliably electrically connected to the inner conductor 14b.

  The insulator 16 is formed of an insulating material such as resin (for example, PTFE), and is provided between the outer conductor 12 and the inner conductor 14 to insulate the outer conductor 12 and the inner conductor 14 from each other. More specifically, the insulator 16 is composed of insulators 16a and 16b. The insulator 16a is a cylinder having an outer diameter R1, as shown in FIG. The insulator 16a has inner diameters r1, r3, r4. The insulator 16b is a cylinder having an outer diameter R2 as shown in FIG. The insulator 16b has an inner diameter r2.

  The outer conductor 12, the inner conductor 14, and the insulator 16 as described above are assembled by the following procedure. More specifically, the inner conductor 14 is inserted into the insulator 16 from the hole on the insulator 16a side. At this time, the inner conductor 14b is pushed into the insulator 16 so that the inner conductor 14b is located in the insulator 16b and the inner conductors 14a, 14c, and 14d are located in the insulator 16a. Next, the insulator 16 is inserted into the outer conductor 12 from the hole on the outer conductor 12a side. At this time, the insulator 16 is pushed into the outer conductor 12 so that the inner conductor 14b is located in the outer conductor 12b and the inner conductors 14a, 14c, and 14d are located in the outer conductor 12a. Thereby, the coaxial connector 10 shown in FIG. 1 is completed.

  In the coaxial connector 10 as described above, as shown in FIG. 2, the region where the inner conductor 14a is provided is defined as a region A1, and the region where the inner conductor 14b is provided is defined as a region A2. A region where the 14c is provided is defined as a region A3, and a region where the inner conductor 14d is provided is defined as A4. The ratio of the outer diameter r1 to the inner diameter R1 is equal to the ratio of the outer diameter r2 to the inner diameter R2. Therefore, the characteristic impedance Z1 of the region A1 is equal to the characteristic impedance Z2 of the region A2. Furthermore, the value of the ratio of the outer diameter r1 to the inner diameter R1 is larger than the value of the ratio of the outer diameters r3 and r4 to the inner diameter R1. Therefore, the characteristic impedance Z1 of the region A1 is smaller than the characteristic impedances Z3 and Z4 of the regions A3 and A4.

  Further, the sum of the length L3 of the region A3 and the length L4 of the region A4 is equal to or less than a quarter of the wavelength of the highest frequency signal among the signals transmitted through the inner conductor 14.

Examples of design values of the coaxial connector 10 are listed below.
r1: 1.27mm
r2: 0.86mm
r3: 0.98 mm
r4: 0.86mm
R1: 4.25mm
R2: 2.88 mm
L3 (length of region A3): 0.3 mm
L4 (length of region A4): 0.3 mm
Dielectric constant of insulator 16: 2.1

(effect)
The coaxial connector 10 configured as described above can suppress signal reflection, as described below. FIG. 4A is a diagram showing electric lines of force generated in the coaxial connector 10. FIG. 5 is an equivalent circuit diagram of the coaxial connector 10.

  In the coaxial connector 10, as shown in FIG. 2, the outer diameter of the inner conductor 14 is changed from the outer diameter r4 to the outer diameter r3. Therefore, the corner E1 is formed in the inner conductor 14 as shown in FIG. When the corner portion E1 is formed, as shown in FIG. 4A, the electric lines of force e1 generated from portions other than the corner portion E1 are generated radially in a direction orthogonal to the inner conductor 14, whereas The electric lines of force e2 generated from the corner E1 are generated in a direction bent from a direction orthogonal to the inner conductor 14. That is, in the areas A1, A2, and A3, TM mode electromagnetic fields are generated, whereas in the area A4, quasi-TM mode electromagnetic fields are generated. The reason why the quasi-TM mode electromagnetic field is generated in the region A4 is that a capacitance component C is generated between the corner E1 and the outer conductor 12. When such a capacitive component C occurs, impedance matching between the regions A1 and A2 and the regions A4 and A3 is lost, and signal reflection occurs in the regions A3 and A4.

  Therefore, the coaxial connector 10 suppresses signal reflection by the method described below. More specifically, an equivalent circuit diagram of the coaxial connector 10 is shown in FIG. That is, the regions A1 and A2 have characteristic impedances Z1 and Z2 (for example, 50Ω), respectively. On the other hand, the areas A3 and A4 have characteristic impedances Z3 and Z4 larger than the characteristic impedance Z1 because the outer diameters of the inner conductors 14c and 14d are the outer diameters r3 and r4 and the outer diameter of the outer conductor 12a is the inner diameter R1. doing. In addition, a capacitance component C is generated at the boundary between the inner conductor 14c and the inner conductor 14d.

  In the equivalent circuit as shown in FIG. 5A, the characteristic impedances Z3 and Z4 can be regarded as the characteristic impedance Z0 (= Z1 and Z2) and the inductance components Lw1 and Lw2 connected in series, respectively. The inductance components Lw1 and Lw2 are obtained by subtracting the characteristic impedance Z0 from the characteristic impedances Z3 and Z4, respectively. However, these are obtained not by simple subtraction but by calculation using a Smith chart. The calculation of the inductance components Lw1 and Lw2 is a general calculation method and will not be described.

  The coaxial connector 10 is designed so that the T-type LC circuit including the inductance components Lw1 and Lw2 and the capacitance component C is equal to the characteristic impedance Z0. That is, the coaxial connector 10 is designed so that Z0 = √ ((Lw1 + Lw2) / C) is established. Thereby, the occurrence of signal reflection in the areas A3 and A4 is suppressed.

  Note that the inductance component Lw1 and the inductance component Lw2 are preferably equal. Thereby, the reflection of the signal in area | region A3, A4 can be suppressed effectively.

  Furthermore, the coaxial connector 10 can suppress signal reflection in a wider frequency band than the coaxial connector 510 as described below. More specifically, in the conventional coaxial connector 510, impedance matching is measured by an inductance component Lw and a capacitance component C as shown in FIG. That is, in the coaxial connector 510, impedance matching is achieved by an LC circuit including two elements of one coil and one capacitor.

  On the other hand, in the coaxial connector 10, impedance matching is achieved by the inductance components Lw1 and Lw2 and the capacitance component C as shown in FIG. That is, in the coaxial connector 10, impedance matching is achieved by an LC circuit composed of three elements of two coils and one capacitor.

  Here, the bandwidth capable of suppressing signal reflection is proportional to the product of the number of elements and VSWR (Voltage Standing Wave Ratio). Therefore, when the VSWR is constant, the greater the number of elements, the wider the bandwidth at which signal reflection can be suppressed. Therefore, it can be said that the coaxial connector 10 can suppress signal reflection in a wider frequency band than the coaxial connector 510.

  Moreover, in the coaxial connector 10, reflection of a signal can be suppressed also for the following reasons. More specifically, in the coaxial connector 10, the sum of the length L3 of the region A3 and the length L4 of the region A4 is a quarter of the wavelength of the highest frequency signal among the signals transmitted through the inner conductor 14. 1 or less. Therefore, the occurrence of standing waves is suppressed in the regions A3 and A4. As a result, the occurrence of signal reflection is suppressed in the regions A3 and A4.

(Modification)
Below, the coaxial connector 10a which concerns on a modification is demonstrated, referring drawings. FIG. 7 is a sectional view of the coaxial connector 10a.

  The difference between the coaxial connector 10 and the coaxial connector 10a is that, in the coaxial connector 10, the outer conductor 12 and the inner conductor 14 are all insulated by the insulator 16, whereas the coaxial connector 10a is different from the outer conductor 12 in the coaxial connector 10a. The inner conductor 14 is insulated by the insulator 16 and air. This will be described in more detail below.

  In the coaxial connector 10a, as shown in FIG. 7, in the region A3, the insulator 16 has an inner diameter r1. Therefore, there is a gap G between the inner conductor 14 c and the insulator 16. That is, the outer conductor 12a and the inner conductor 14c are insulated from each other by the insulator 16 and air.

  Even with the above configuration, the coaxial connector 10 a can suppress signal reflection in a wider frequency band than the coaxial connector 510, similarly to the coaxial connector 10.

  In the coaxial connector 10, the insulator 16 has three types of inner diameters, whereas in the coaxial connector 10a, the insulator 16 has only two types of inner diameters. Therefore, the insulator 16 of the coaxial connector 10 a can be manufactured more easily than the insulator 16 of the coaxial connector 10.

(Other embodiments)
The coaxial connector according to the present invention is not limited to the coaxial connectors 10 and 10a, and can be changed in design within the scope of the gist thereof. Hereinafter, coaxial connectors according to other embodiments will be described with reference to the drawings. FIG. 8 is a sectional structural view of coaxial connectors 10b and 10c according to another embodiment.

  In the coaxial connectors 10 and 10a, the outer diameter r3 of the inner conductor 14c is made smaller than the outer diameter r1 of the inner conductor 14a in order to make the characteristic impedance Z3 of the region A3 larger than the characteristic impedance Z1 of the region A1. . However, the method for making the characteristic impedance Z3 of the region A3 larger than the characteristic impedance Z1 of the region A1 is not limited to this.

  In the coaxial connector 10b, as shown in FIG. 8A, the outer diameter r3 of the inner conductor 14c is equal to the outer diameter r1 of the inner conductor 14a. Instead, the inner diameter R1 ′ of the outer conductor 12a in the regions A3 and A4 is larger than the inner diameter R1 of the outer conductor 12a in the region A1. Thereby, the value of the ratio of the outer diameter r1 to the inner diameter R1 becomes larger than the value of the ratio of the outer diameter r3 to the inner diameter R1 ′. Therefore, the characteristic impedance Z1 of the region A1 is smaller than the characteristic impedance Z3 of the region A3. Therefore, also in the coaxial connector 10b, the reflection of signals can be suppressed in a wider frequency band as in the coaxial connector 10, compared to the coaxial connector 510.

  In the coaxial connector 10c, as shown in FIG. 8B, the outer diameter r3 of the inner conductor 14c is equal to the outer diameter r1 of the inner conductor 14a. Instead, the outer diameter R3 of the insulator 16a in the regions A3 and A4 is smaller than the outer diameter R1 of the insulator 16a in the region A1. Accordingly, in the regions A3 and A4, a gap G ′ exists between the outer conductor 12a and the insulator 16a. That is, the outer conductor 12a and the inner conductors 14c and 14d are insulated from each other by the insulator 16a and air. The relative permittivity of air is smaller than the relative permittivity of the insulator 16a. Therefore, due to the presence of the gap G ′, the average value of the relative dielectric constant between the outer conductor 12a and the inner conductors 14c and 14d in the regions A3 and A4 is between the outer conductor 12a and the inner conductor 14a in the region A1. It becomes smaller than the average value of the relative dielectric constant.

  Here, the characteristic impedance of the coaxial line is inversely proportional to the square root of the relative dielectric constant. Therefore, in the coaxial connector 10c, the characteristic impedance Z1 in the region A1 is smaller than the characteristic impedance Z3 in the region A3. Therefore, the coaxial connector 10 c can also suppress signal reflection in a wider frequency band than the coaxial connector 510, similarly to the coaxial connector 10.

  In the coaxial connectors 10, 10a to 10c, the outer diameter r4 is equal to the outer diameter r2. However, the size of the outer diameter r4 is not limited to this. The outer diameter r4 may be equal to or larger than the outer diameter r2 and smaller than the outer diameter r3. However, when the outer diameter r2 and the outer diameter r4 are equal, the processing of the inner conductor 14 becomes easy.

  The structure of the coaxial connectors 10, 10a to 10c may be applied to a coaxial line other than the coaxial connector.

  INDUSTRIAL APPLICABILITY The present invention is useful for a coaxial line and a coaxial connector, and is excellent particularly in that signal reflection can be suppressed in a wide frequency band.

A1 to A4 region C Capacitance component G, G 'Gap Lw1, Lw2 Inductance component 10, 10a to 10c Coaxial connector 12, 12a, 12b Outer conductor 14, 14a to 14d Inner conductor 16, 16a, 16b Insulator

Claims (5)

A coaxial line comprising a cylindrical outer conductor and an inner conductor extending in the outer conductor in a state insulated from the outer conductor,
The outer conductor is
A first outer conductor having a first inner diameter;
A second outer conductor connected to the first outer conductor and having a second inner diameter smaller than the first inner diameter;
Including
The inner conductor is
A first inner conductor extending in the first outer conductor and having a first outer diameter;
A second inner conductor extending in the second outer conductor and having a second outer diameter smaller than the first outer diameter;
A third inner conductor extending in the first outer conductor and having a third outer diameter not greater than the first outer diameter and greater than the second outer diameter. A third inner conductor connected to the first inner conductor;
A fourth inner conductor extending in the first outer conductor and having a fourth outer diameter that is equal to or larger than the second outer diameter and smaller than the third outer diameter; A fourth inner conductor provided between the second inner conductor and the third inner conductor;
Including
The first characteristic impedance of the first region in which the first inner conductor is provided is equal to the second characteristic impedance of the second region in which the second inner conductor is provided, and rather smaller than the fourth characteristic impedance of the fourth region where the third characteristic impedance and the fourth inner conductor of the third region third inner conductor is disposed is provided,
The third outer diameter is smaller than the first outer diameter;
The sum of the length of the third region and the length of the fourth region is not more than one-fourth of the wavelength of the highest frequency signal among the signals transmitted through the inner conductor;
Coaxial line characterized by A first inductance component obtained by subtracting the first characteristic impedance from the third characteristic impedance; a second inductance component obtained by subtracting the first characteristic impedance from the fourth characteristic impedance; and The impedance of the T-type LC circuit composed of a capacitive component generated at the boundary between the third region and the fourth region is equal to the first characteristic impedance;
The coaxial line according to claim 1 . The first inductance component and the second inductance component are equal;
The coaxial line according to claim 2 . The fourth outer diameter is equal to the second outer diameter;
The coaxial line according to any one of claims 1 to 3 , wherein: Coaxial connector comprising the coaxial line according to one of claims 1 to 4.

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