WO2002045202A1

WO2002045202A1 - Noncontact rotary joint

Info

Publication number: WO2002045202A1
Application number: PCT/JP2001/010333
Authority: WO
Inventors: Hiroyuki Ohmine; Toru Fukasawa; Masataka Ohtsuka; Eiji Morimoto; Moriyasu Miyazaki
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2000-11-29
Filing date: 2001-11-27
Publication date: 2002-06-06
Also published as: JP2002232201A

Abstract

A noncontact rotary joint comprising a metallic cavity (5) having an inside diameter or the width of a waveguide shorter than a quarter of the wavelength μ of a transmission signal, a first coaxial line (3) provided on one of a pair of opposite faces of the metallic cavity such that the coaxial outer conductor is fixed and the coaxial inner conductor is inserted into the metallic cavity to form a coaxial feeder probe having a line length of about μ/4, and a second coaxial line (9) provided from the opposite side of the first coaxial line to the other face of the pair of opposite faces of the metallic cavity such that the coaxial outer conductor is rotatable and the coaxial inner conductor overlaps the coaxial feeder probe of the first coaxial line through an interval in the axial direction to form a coaxial feeder probe having a line length of about μ/4.

Description

Specification

Non-contact port joints Technical field

The present invention relates to a non-contact aperture joint for transmitting high-frequency signals between a fixed part and a rotating part rotatably supported by the fixed part. Background art

In recent years, satellite communications such as BS (Broadcasting Satellite) and CS (Communication Satellite) have become widespread, and digital BS, digital CS, and terrestrial digital broadcasting are also planned. The demand for doing this will increase in the future.

Here, in order to receive these broadcasts and communications with sufficient strength, a high-gain antenna with a narrow beam width must be used. On the other hand, in mobiles such as automobiles, the direction of the satellite changes as the vehicle travels. Therefore, in order to receive a broadcast in a mobile object, it is necessary to control the azimuth and elevation of the beam according to the movement of the mobile object, and always keep the beam in the satellite direction.

Of these, the azimuth angle requires the beam to be directed in all directions in the horizontal plane, so a method of mechanically rotating the antenna element in the azimuth plane is generally used. Therefore, a rotatable mouth-to-mouth joint is required to receive or transmit a signal with the antenna element.

Mouth and night joints that transmit high-frequency signals are roughly divided into

(1) Signals transmitted by mechanical contacts (contact type)

(2) Non-contact signal transmission by electromagnetic coupling (non-contact type)

There are two types. -Of these, the contact type (1) has excellent transmission characteristics, but the number of rotations is limited due to wear of the contacts. For this reason, there is a limit as a mobile-mounted antenna that changes the direction of the beam at all times as the mobile moves. Therefore, the non-contact antenna of (2) is preferable as the mobile antenna. On the other hand, as a requirement for a non-contact mouth-to-mouth joint of a mobile antenna,

(1) Low transmission loss

(2) Direction dependence such as level fluctuation due to rotation is small

(3) Little change in frequency characteristics of transmission characteristics within desired band

This is very important.

As a conventional example, as shown in FIG. 21, there is a configuration in which coaxial lines are connected in a non-contact manner. The first coaxial line inner conductor 50 is provided with a convex portion, and the second coaxial line inner conductor 51 is provided with a concave portion, and they are connected in a non-contact manner by fitting them together with an air layer or a dielectric layer interposed therebetween. . When the wavelength of the transmission signal is λ, the length of the uneven portion 52 is set to about / 4, so that a choke is formed. Therefore, the leakage to the outside is small while being non-contact. Similarly, the first coaxial line outer conductor 53 and the second coaxial line outer conductor 54 are connected in a non-contact manner by providing an uneven portion 55 (a cutout portion) so as to complement each other. According to such a non-contact rotary joint, it can rotate freely and can transmit a high-frequency signal in a non-contact manner. In particular, it has features that can be downsized.

Fig. 22 shows a conventional example using a waveguide. In this configuration, coaxial probes are inserted into the center of the circular cavity 60 from both sides. Since the circular cavity is excited by the T M01 mode, the magnetic field is distributed symmetrically around the probe, and the probes are coupled in a non-contact manner. 61 is a choke structure that holds the rotating part.

However, the conventional configuration shown in FIG. 21 has a problem in that the processing accuracy and assembling accuracy of the concavo-convex portions are important, and the characteristics are greatly changed due to the misalignment of the center axis of the coaxial line. If the axis deviation increases, contact will occur at the non-contact part, and the characteristics will change significantly. Especially in the low frequency band, the axial deviation becomes a serious problem because the uneven portion becomes long.

In addition, in the conventional configuration shown in FIG. 22, since the Μ Μ 01 mode is used, the cavity diameter becomes approximately on (one wavelength) (mode kc = 2 · 40), and further rotation Since the part requires a choke structure, there has been a problem that the dimensions of the entire device become significantly larger, especially as the frequency becomes lower.

The present invention has been made in order to solve the above problems, and has been made in consideration of a coaxial probe. It is an object of the present invention to provide a small-sized non-contact port joint having a small increase in transmission loss even when a displacement occurs.

Another object of the present invention is to provide a non-contact rotary joint in which the outer conductor and the inner conductor of the coaxial line are provided with uneven portions, in particular, the diameter of the conductor in the line can be reduced and the processing is relatively easy. I do. Disclosure of the invention

The first invention is a metal cavity having an inner diameter or a waveguide width shorter than 1/4 of the wavelength of a transmission signal and having at least a pair of opposing surfaces, and a pair of opposing surfaces of the metal cavity. On the other hand, a first coaxial line provided with an outer coaxial conductor fixed and an inner coaxial conductor inserted into the metal cavity to form a coaxial feed probe having a line length of about / 4, On the other of the pair of opposite surfaces of the metal cavity from the opposite side of the coaxial line, the outer coaxial conductor is rotatable, and the inner coaxial conductor is rotated so that it does not contact the coaxial feed probe of the first coaxial line. A second coaxial line that is inserted into the metal cavity so as to be shifted in center and overlap with an interval in the axial direction, and that is provided so as to form a coaxial feed probe having a line length of about / 4. Non-contact Isseki in the Lee joint.

The second invention is a metal cavity having an inner diameter or a waveguide width shorter than 1/4 of the wavelength λ of a transmission signal and having at least a pair of opposing surfaces, and a pair of opposing surfaces of the metal cavity. On the other hand, a first coaxial line provided with an outer coaxial conductor fixed and an inner coaxial conductor inserted into the metal cavity to form a coaxial feed probe having a line length of about λ / 4; A metal plate that is rotatably arranged substantially parallel to the outside of the other pair of opposing surfaces of the pair of surfaces and forms a choke structure having a length of about で 4 at a gap between the metal cavity and the metal plate; An outer coaxial conductor is fixed to the above-mentioned metal plate so as to be rotatable together with the metal plate from the side opposite to the coaxial line of the first coaxial line so that the coaxial inner conductor does not contact the coaxial power supply probe of the first coaxial line. Off-center and axially A second coaxial line that penetrates the metal plate so as to overlap with an interval and is inserted into the metal cavity to form a coaxial feed probe having a line length of about /. Non-contact mouth one-piece joint characterized by is there.

A third invention resides in the non-contact port one-joint of the first or second invention, wherein the coaxial power supply probe of the second coaxial line is arranged in the center of the metal cavity.

A fourth invention resides in a non-contact opening overnight joint of the third invention, characterized in that a dielectric spacer is entirely inserted into a gap between the surface of the metal cavity and the metal plate.

According to a fifth aspect of the present invention, the metal cavity has a columnar shape, the metal plate has a disk shape, and the metal plate is bent so as to extend a tip and provide a gap between the metal plates along the metal cavity shape. A non-contact opening and free joint according to any one of the second to fourth inventions, characterized in that a dielectric spacer is provided between the bent portion and the metal cavity.

In a sixth aspect of the present invention, the metal cavity has a cylindrical shape and the metal plate has a disk shape, and the metal plate is bent so that a tip thereof is extended and a gap is provided along the metal cavity shape. A metal part having a flange portion that is bent outward from the bent portion of the metal plate and extends outward, and a bearing is inserted into the gap between the bent portion and the root of the bent portion, The distance from the center of the coaxial inner conductor of the second coaxial line to the bearing is approximately Z2. . A seventh invention resides in the non-contact wire joint according to any one of the first to sixth inventions, wherein a tip of the coaxial power supply probe is thickened.

An eighth invention is the non-contact low-joint joint according to any one of the first to sixth inventions, characterized in that a small metal plate is loaded at the tip of the coaxial power supply probe and the capacitance is loaded.

The ninth invention is characterized in that the tip of the coaxial power supply probe of the first coaxial line is short-circuited inside the metal cavity, and the non-contact port of any one of the first to sixth inventions is provided. At the joint.

A tenth aspect of the present invention is the non-contact rotatable device according to any one of the first to ninth aspects, further comprising an impedance matching mechanism for changing a space shape in the cavity. At the joint.

The eleventh aspect of the present invention is that the first invention is formed so as to face each other and to form a space having an inner diameter shorter than 1 Z 4 of the wavelength of a transmission signal inside, each having a circular bottom surface and side surfaces extending along the periphery thereof. A coaxial outer conductor is fixed to the bottom surface of two metallic cup-shaped members with different diameters and one metallic cup-shaped member, and a coaxial inner conductor is inserted into the above metal cavity, and a coaxial cable with a line length of about / 4 A first coaxial line provided to form a power feeding probe, and a coaxial outer conductor rotatable on the bottom surface of the other metallic force-shaped member from the side opposite to the first coaxial line, A line length of about / 4 inserted in the metal cavity so that the coaxial inner conductor is shifted so that the coaxial inner conductor does not contact the coaxial power supply probe of the first coaxial line and overlaps at an interval in the axial direction. To form a coaxial power supply probe A second coaxial line, and a dielectric spacer provided in a gap between the side surfaces of the two metal-shaped members. At the joint.

A twelfth invention is a non-contact port for connecting two coaxial lines rotatably about an axis, which is a non-contact port, and is complementary to and between the coaxial outer conductor tips of both coaxial lines. A notch is provided so that it can be rotated, and the tip of the coaxial inner conductor of the non-rotating coaxial line is bent close to the tip of the coaxial inner conductor of the rotating coaxial line so as to be electromagnetically coupled. Non-contact mouth is one of the special features. BRIEF DESCRIPTION OF THE FIGURES

FIGS. 1 to 3 are diagrams for explaining a non-contact opening and closing joint according to Embodiment 1 of the present invention.

FIGS. 4 to 7 are diagrams for explaining a non-contact opening joint according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a schematic configuration of another example of the non-contact opening and closing joint according to the second embodiment of the present invention.

FIG. 9 is a diagram showing a schematic configuration of a non-contact opening joint according to Embodiment 3 of the present invention. FIG. 10 is a diagram showing a schematic configuration of a non-contact opening one joint according to a fourth embodiment of the present invention.

FIG. 11 is a diagram showing a schematic configuration of a non-contact wire joint according to Embodiment 5 of the present invention.

FIG. 12 is a diagram showing a schematic configuration of a non-contact port overnight joint according to Embodiment 6 of the present invention.

FIG. 13 is a diagram showing a schematic configuration of a non-contact opening and closing joint according to Embodiment 7 of the present invention.

FIGS. 14 to 16 are diagrams for explaining a non-contact port overnight joint according to Embodiment 8 of the present invention.

FIG. 17 is a diagram showing a schematic configuration of a non-contact opening one joint according to a ninth embodiment of the present invention.

FIG. 18 is a diagram showing a schematic configuration of a non-contact opening joint according to Embodiment 10 of the present invention.

FIG. 19 is a diagram showing a schematic configuration of a non-contact roller joint according to Embodiment 11 of the present invention.

FIG. 20 is a diagram showing a schematic configuration of a non-contact rotary joint according to Embodiment 12 of the present invention,

FIG. 21 is a diagram showing a schematic configuration of a conventional non-contact rotary joint having a configuration in which coaxial lines are connected in a non-contact manner.

FIG. 22 is a diagram showing a schematic configuration of a conventional non-contact aperture joint using a waveguide. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, a non-contact type rope joint according to the present invention will be described with reference to the drawings according to each embodiment. Example 1

1 to 3 are schematic configuration diagrams showing a first embodiment of the present invention. FIG. 1 is a perspective view, FIG. Is a top view, and FIG. 3 is a sectional view taken along the line AA ′. In the figure, reference numeral 1 denotes a first outer coaxial conductor, 2 denotes a first inner coaxial conductor, and both constitute a first coaxial line 3. 4 is a first coaxial power supply probe, 5 is a metal cavity, and 6 is a fixed connection part for connecting the metal cavity 5 and the first coaxial outer conductor 1.

Reference numeral 7 denotes a second outer coaxial conductor, 8 denotes a second inner coaxial conductor, and both constitute a second coaxial line 9. Reference numeral 10 denotes a second coaxial power supply probe, and 11 denotes a rotating unit. Next, the operation will be described. In this example, a single joint used for an antenna mounted on a moving body is used. The first coaxial line 3 is connected to a fixed part side fixed to the moving body, and the second coaxial line Reference numeral 9 denotes a rotating unit rotatably supported, which is connected to a rotating antenna.

The outer conductor 1 of the first coaxial line 3 is connected and fixed to the metal cavity 5, and the tip of the inner conductor 2 is inserted into the cavity 5 as the first coaxial power supply probe 4. The tip of the probe is open. If the probe length is about / 4, where λ is the wavelength of the transmission signal, the probe 5 is strongly radiated into the cavity 5.

On the other hand, similarly, the inner conductor 8 of the second coaxial line 9 is inserted as the second coaxial power supply probe 10 from the opposed position. The first and second coaxial power supply probes 4, 10 are arranged such that their axes are shifted so that they do not come into contact with each other and overlap with an interval in the axial direction. By making the tips of the probes overlap each other in the axial direction, the arrangement is such that electromagnetic coupling is achieved, and the coupling between the probes is characterized by being strong.

Here, it should be noted that the inner diameter (inner diameter) of the cavity 5 is shorter than λΖ4. Since the conventional low-joint joint using waveguide cavities was basically configured with dimensions corresponding to the electromagnetic field mode in the cavities, in order to avoid cutoff, the inner diameter must be at least 1/2 or more (kc = 1.84), and in the TM01 mode conventionally used, the inner diameter is reduced to about one wavelength.

In this embodiment, by shifting the center positions of the power supply probes to each other, this cavity size can be reduced and the inner diameter can be reduced to about / 4 to about / 6 or less. Bringing it closer than the two power-supply pro- cesses will increase the coupling and reduce the cavity accordingly. In this case, the cavity is smaller than the cut-off, and the cavity has such a size that no resonance mode exists. The operation is different from that using the resonance of the tee. In other words, the present invention is a method in which the power supply probes are closely coupled by bringing them close to each other, and the cavity is to assist this coupling. Therefore, there is a feature that does not largely depend on the cavity size.

By arranging the two power supply probes 4 and 10 close to each other and by bringing the overlap between the two probes close to the input / 4, coupling can be achieved without using resonance of the cavity. Is transmitted. Note that the second coaxial line 9 may rotate only the outer conductor 7.

As a result, high-frequency signals are transmitted by electromagnetic coupling without using resonance of the cavity.Thus, even if the coaxial probe is displaced, the increase in transmission loss is small and the size is significantly reduced. There is an effect that can be done. Example 2.

4 to 7 show the configuration of the second embodiment of the present invention. FIG. 4 is a perspective view, FIG. 5 is a cross-sectional view taken along line AA ′, FIG. 6 shows transmission characteristics, and FIG. 7 shows a bandwidth. Reference numeral 12 denotes a metal plate, reference numeral 14 denotes an upper surface of the cavity, and a spacer 13 is provided between the two to support a gap. Reference numeral 15 denotes a choke structure. The second coaxial outer conductor 7 is fixed to the metal plate 12, and these serve as rotating parts. The metal plate 12 is provided with a hole having substantially the same size as the outer coaxial conductor 7, and the inner coaxial conductor 8 is inserted through the inside of the cavity 5, and the second coaxial feeder 10 10 Works as

Here, assuming that the distance from the center of the second coaxial inner conductor 8 to the end of the gap formed by the metal plate 12 and the upper surface 14 of the cavity is approximately / 4, the choke structure 1 of λ / 4 Becomes 5. That is, radiation from the gap can be suppressed. The length of the chuck structure is approximately; / 4, and the size may be optimized by reducing the radiation from the choke portion by using a derivative spacer or the like.

As an example, FIG. 6 shows calculated values and measured values of the transmission characteristics of the non-contact rotary joint of the present embodiment shown in the figure. Although the inside diameter of the cavity is as small as about / 4, it can be seen that good transmission characteristics are obtained. Also, the calculated and measured values agree well . Fig. 6 shows an example, but it has been confirmed by calculation that broadband characteristics can be obtained even if the inner diameter of the cavity is increased to about / 6.

Figure 7 shows the calculated bandwidth when the cavity dimensions are changed. Here, the bandwidth indicates a band where the transmission loss is 0.5 dB or less. As shown in the figure, the bandwidth is widest when the cavity size is about 0.25 wavelength. In this case, an extremely wide band characteristic of about 60% is obtained. Broadband characteristics can be obtained even if the cavity size is set to about 0.3 wavelength, but 0.25 wavelength or less is desirable for further miniaturization.

FIG. 8 shows an embodiment in which a square cavity 17 is used. In this case as well, the cutoff can be achieved by making the rectangular waveguide width W (the width inside the cavity in the direction perpendicular to the line connecting the two feeding probes) shorter than / 4, but the distance between the probes can be reduced. By arranging them in this way, it is possible to achieve miniaturization by using electromagnetic coupling. Also, the rectangular waveguide length L can be made shorter than Pen 2 by bringing two feeding probes close to each other.

Therefore, the choke structure has an effect that radiation from the gap can be significantly reduced. Example 3.

FIG. 9 shows the configuration of Embodiment 3 of the present invention. A second coaxial line 9 including a second outer coaxial conductor 7, an inner conductor 8, and a power supply probe 10 is arranged at the center of the metal cavity 5. As a result, a choke structure constituted by setting the distance from the center of the second coaxial inner conductor 8 to the end of the gap formed by the metal plate 12 and the cavity upper surface 1 to be approximately λ / 4 is obtained. Become symmetric.

Therefore, by setting the second coaxial line at the center of the cavity, the symmetry is improved and there is an effect that characteristics independent of rotation can be obtained. Example 4.

FIG. 10 shows the configuration of Embodiment 4 of the present invention. In Examples 2 and 3, the diameter of the choke structure is larger than the inner diameter of the cavity because of the choke structure. . In order to obtain a choke structure, the diameter is about λ / 2, so the size is limited by this choke structure. Therefore, a choke structure 19 is provided in which a dielectric spacer 18 is entirely inserted from the center of the second coaxial inner conductor 8 into a gap formed by the metal plate 12 and the cavity upper surface 14. By increasing the dielectric constant, the size of the choke can be reduced. Assuming that the wavelength of a transmission signal in a free space such as in the air is human, the wavelength when a dielectric sensor is inserted is, and g is smaller than the input. That is, A g = λ / ετ (εr: non-conductivity of the dielectric).

Therefore, miniaturization can be achieved by inserting a dielectric spacer into the choke structure. Embodiment 5.

FIG. 11 shows a configuration of a fifth embodiment of the present invention. In the figure, reference numeral 25 denotes a bent portion at the tip of the metal plate 12. In the fourth embodiment, the miniaturization was achieved by inserting the dielectric spacer 18 into the entire body. However, when used for a long period of time, the gap with the dielectric spacer 18 caused the gas gap to decrease. The resulting performance may change. Therefore, the tip of the metal plate 12 is extended to provide a bent portion 25, and the distance from the center of the second inner coaxial conductor 8 to the tip of the metal plate of the bent portion 25 is set to about λΖ4, thereby reducing the size. Can be achieved. A gap is also provided between the bent portion 25 and the metal cavity 5, and the dielectric spacer 72 is inserted here. Further, the metal cavity 5 needs to have a cylindrical shape and the metal plate 12 needs to have a disk shape. '

Therefore, it is possible to reduce the size by forming a choke structure in which the tip of the metal plate 12 is bent, and there is an effect that the performance does not change with a change in the gap. Embodiment 6.

FIG. 12 shows the configuration of Embodiment 6 of the present invention. In the figure, 26 is a bearing. In Examples 2 to 5, the distance from the center of the second coaxial inner conductor 8 to the tip of the choke structure was set to / 4, and the open choke was opened at the tip. In this embodiment, the tip is further extended to form a short-circuited short choke / 2.

The shape of the metal cavity 5 is cylindrical and the metal plate 1 2 must be disk-shaped . The metal plate 12 has a bent part 25 that is bent so that a tip is extended and a gap is provided along the shape of the metal cavity 5. In addition, the metal cavity 5 has a flange portion 81 that is bent outward from the bent portion 25 of the metal plate 12 and extends outward. A bearing is inserted into the side, that is, the short-circuited portion, and has a function to facilitate rotation. The distance from the center of the coaxial inner conductor 8 of the second coaxial line 9 to the bearing 26 was about λ / 2.

Therefore, radiation can be completely suppressed by using a person / 2-length short choke, and a shield structure is obtained, which is effective. Embodiment 7.

FIG. 13 shows the configuration of Embodiment 7 of the present invention. In the figure, reference numeral 27 denotes a coaxial power supply probe whose first tip is thickened, and reference numeral 28 denotes a coaxial power supply probe whose second tip is thickened. By making the tip of the probe thicker, the frequency bandwidth of the transmission signal can be widened and the bandwidth can be widened.

Therefore, there is an effect that the operating frequency band can be broadened by using a probe having a thick tip. Example 8

14 to 16 show the configuration of the eighth embodiment of the present invention. In FIG. 14, reference numeral 30 denotes a first capacitively loaded power supply probe, and 31 denotes a second capacitively loaded power supply probe. FIGS. 15 and 16 show enlarged and cross-sectional views of the capacitance-loaded power supply probes 30 and 31. FIG. In the figure, 34 is a coaxial inner conductor of each of the coaxial lines 3 and 9, 35 is a small metal plate for loading a capacitance, and 36 and 37 are short pins for matching.

In general, the length of the power supply probe in the metal cavity 5 needs to be λ / 4 of the transmission signal, but by loading a small metal plate 35 at the tip, the capacity is increased and the overall length is shortened. can do. If the total length is shortened, the impedance also decreases. Therefore, in order to match the coaxial lines 3 and 9, short pins 36 and 37 for matching are provided. Therefore, the use of the capacitance-loaded power supply probe can reduce the probe height, and thus has the effect of greatly reducing the metal cavity height. Embodiment 9.

FIG. 17 shows the configuration of the ninth embodiment of the present invention. In the figure, 38 is a short-circuit type power supply probe. In order to fix the coaxial power supply probe of the first coaxial line 3, power is supplied by short-circuiting the tip inside the metal cavity 5. Since a magnetic field is generated by this power supply, the second coaxial power supply probe 10 is excited. Since the coaxial feed probe of the first coaxial line 3 is configured close to the inner side surface of the metal cavity 5, it is easy to reduce the size.

Therefore, by using a short-circuited power feeding probe, the probe size can be reduced, and the metal cavity can be reduced. Example 10

FIG. 18 shows the configuration of embodiment 10 of the present invention. In the figure, reference numerals 40a, 40b, 40c, and 40d are matching blocks provided in the metal cavity 5. Reducing the cavity changes the impedance of the coaxial feed probe, making matching difficult. Therefore, matching blocks 40a, 40b, 40c, and 4Od for impedance matching are provided in the cavity, or the metal cavity 5 has a step structure inside (these are used for impedance matching). Mechanism) to facilitate alignment.

Therefore, by providing an impedance matching mechanism such as a matching block in the cavity, there is an effect that impedance matching can be achieved even if the cavity is reduced. Example 11 1.

FIG. 19 shows the configuration of Embodiment 11 of the present invention. Although the device in which the choke structure is reduced by using the dielectric spacer in the fourth embodiment of FIG. 10 is shown, the same configuration as shown in FIG. 19 is possible.

In FIG. 19, 91 and 92 are fitted opposite each other and have an inside diameter inside. Are formed into two spaces with different diameters, each of which has a circular bottom surface and a side surface extending along the circumference. A dielectric spacer 70 is inserted in the gap between the side surfaces of the members 91 and 92. The first coaxial line 3 is fixed to the metallic cup-shaped member 91, and the metallic cup-shaped member 92 is formed on the second coaxial line 9 and is configured to rotate together with the coaxial line 9. I have.

Even with such a configuration, the choke structure can be reduced by increasing the dielectric constant using the dielectric spacer. Example 1 2.

FIG. 20 shows the configuration of Embodiment 12 of the present invention. This embodiment relates to a non-contact port joint having irregularities on the outer conductor and inner conductor of the coaxial line. In the figure, 41 is the first coaxial power supply probe, and 42 is the second coaxial power supply probe. Coaxial power supply probe, 4 3 is a non-contact portion, 4 4 is the first outer coaxial conductor with unevenness (notch), 4 5 is the second outer coaxial conductor with unevenness, 4 6 is a choke Department.

The first outer coaxial conductor 44 is fixed, and the second outer coaxial conductor 45 is rotated. Therefore, the second coaxial power supply probe 42 is located at the center of the outer conductor. On the other hand, in order to make the first coaxial power supply probe 41 non-contact, the tip is bent and electromagnetically coupled so as not to contact the second power supply probe.

In other words, in a non-contact low-frequency joint that connects two coaxial lines rotatably about the axis, a gap can be provided between the two coaxial lines at the ends of the coaxial outer conductors that are complementary to each other. The notch K that forms the choke structure is provided as described above, and the axis is shifted so that the coaxial inner conductor of the rotating coaxial line does not contact the tip of the coaxial inner conductor of the non-rotating coaxial line, and the gap in the axial direction is shifted. A bent end portion L bent in a crank shape so as to overlap with the opening is provided. It is also conceivable that the above-mentioned cavity is made smaller and the same dimensions as the outer coaxial conductor. Also, here, an example in which the power supply probe is bent in a crank shape is shown. However, the power supply probe may be bent smoothly, and the two power supply probes may be electromagnetically coupled close to each other so as not to be in contact with each other. Therefore, since the tip of the power supply probe is bent to supply power in a non-contact manner, the diameter of the coaxial conductor and, consequently, the coaxial line can be reduced, and the production is facilitated. Industrial applicability

As described above, according to the first aspect of the present invention, a metal cavity having an inner diameter or a waveguide width shorter than 1/4 of the wavelength of a transmission signal and having at least a pair of opposing surfaces; A first coaxial outer conductor is fixed to one of the pair of opposing surfaces, and an inner coaxial conductor is inserted into the metal cavity to form a coaxial feeder having a line length of about / 4. And a coaxial power supply probe of the first coaxial line, the outer coaxial conductor being rotatable on the other of the pair of opposing surfaces of the metal cavity from the side opposite to the first coaxial line. The second coaxial cable is inserted into the metal cavity so as to be shifted so that it does not come into contact with the metal core and overlap with an interval in the axial direction, and provided to form a coaxial power supply probe having a line length of about / 4. Tracks and The non-contact opening and joint is a characteristic of the high-frequency signal transmission by electromagnetic coupling without using resonance of the cavity, so transmission is possible even when the coaxial probe is displaced. There is an effect that the increase in loss is small and the size can be significantly reduced as compared with the conventional case.

According to the second invention, the inner diameter or the waveguide width is shorter than 1/4 of the wavelength of the transmission signal, and the metal cavity has at least a pair of opposing surfaces. A first coaxial line provided on one of the surfaces so that an outer coaxial conductor is fixed and an inner coaxial conductor is inserted into the metal cavity to form a coaxial feed probe having a line length of about / 4; A metal plate that is rotatably arranged substantially parallel to the outside of the other pair of opposing surfaces of the metal cavity and forms a choke structure having a length of about man / 4 in a gap between the surfaces of the metal cavity; An outer coaxial conductor is fixed to the metal plate from the side opposite to the first coaxial line so as to be rotatable together with the metal plate, and the inner coaxial conductor does not contact the coaxial power supply probe of the first coaxial line. So that the axis is shifted and the axis A second coaxial line penetrating through the metal plate so as to overlap with an interval in the direction and inserted into the metal cavity and provided to form a coaxial feed probe having a line length of about / 4. Non-contact mouth overnight Since the choke structure is used, radiation from the gap can be greatly reduced.

According to the third aspect of the present invention, since the coaxial power supply probe of the second coaxial line is disposed at the center of the metal cavity, the symmetry is improved, and there is an effect that characteristics independent of rotation can be obtained.

According to the fourth aspect of the present invention, since the dielectric spacer is entirely inserted into the gap between the surface of the metal cavity and the metal plate, it is possible to reduce the size by increasing the dielectric constant.

According to the fifth invention, the metal cavity shape is a columnar shape and the metal plate is a disk shape, and the metal plate has a tip extended so that a gap is provided along the metal cavity shape. And a dielectric spacer is provided between the bent portion and the metal cavity, so that the size can be reduced, especially when the gap between the metal plate and the metal cavity changes. On the other hand, there is an effect that the performance does not change. According to the sixth aspect of the present invention, the metal cavity shape is a columnar shape and the metal plate is a disk shape, and the metal plate has a tip extended to provide a gap therebetween along the metal cavity shape. The metal cavity has a flange portion that is bent outward from the bent portion of the metal plate and extends outward. The distance from the center of the coaxial inner conductor of the second coaxial line to the bearing is approximately 1/2, so by using a short choke of person / 2 length, radiation can be completely eliminated. It is possible to obtain a shield structure, which is effective.

Further, according to the seventh aspect, the tip of the coaxial power supply probe is thickened, so that there is an effect that the operating frequency band can be broadened.

Further, according to the eighth invention, since a small metal plate is loaded at the tip of the coaxial power supply probe and the volume is loaded, the height of the probe can be reduced, and the height of the metal cavities can be greatly reduced.

Further, according to the ninth aspect, since the tip of the coaxial power supply probe of the first coaxial line is short-circuited inside the metal cavity, the probe size can be reduced, and the metal cavity can be reduced. Further, according to the tenth aspect, since the impedance matching mechanism for changing the space shape in the cavity is provided, there is an effect that impedance matching can be achieved even when the cavity is reduced.

Further, according to the eleventh aspect of the present invention, the inner surface is formed so as to face each other to form a space whose inner diameter is shorter than 1/4 of the wavelength of the transmission signal, and each has a circular bottom surface and side surfaces extending along the periphery thereof. A coaxial outer conductor is fixed to the bottom surface of two metallic cap-shaped members having different diameters, and a coaxial inner conductor is inserted into the above-mentioned metal cavity. An outer coaxial conductor rotates on a first coaxial line provided to form a coaxial feed probe having a line length, and on the bottom surface of the other metallic force-up shaped member from the side opposite to the first coaxial line. If possible, the coaxial inner conductor is inserted into the metal cavity so that it does not contact the coaxial power supply probe of the first coaxial line, and is inserted into the metal cavity so as to overlap at an interval in the axial direction. Form a coaxial feed probe with a line length A non-contacting linear joint comprising: a second coaxial line provided so as to provide a gap between the side surfaces of the two metallic cup-shaped members; Therefore, the choke structure can be reduced by increasing the dielectric constant using a dielectric spacer.

According to the first and second aspects of the present invention, there is provided a non-contact one-to-one joint for rotatably connecting two coaxial lines about an axis, wherein the two coaxial lines are connected to tips of coaxial outer conductors of both coaxial lines. Notches are provided so that they are complementary to each other and a gap is provided between them so that they can rotate, and the end of the coaxial inner conductor of the non-rotating coaxial line is brought close to the tip of the coaxial inner conductor of the rotating coaxial line. Since it is a non-contact low joint, which is characterized by being bent so as to be connected, it is possible to reduce the diameter of the coaxial inner conductor and, consequently, the coaxial line, and also has the effect of facilitating manufacturing.

Claims

The scope of the claims

1. a metal cavity having an inner diameter or waveguide width shorter than 1/4 of the wavelength of the transmitted signal and having at least a pair of opposing surfaces;

A coaxial outer conductor is fixed to one of a pair of opposing surfaces of the metal cavity, and a coaxial inner conductor is inserted into the metal cavity to form a coaxial power supply probe having a line length of about. 1 coaxial line,

The coaxial outer conductor is rotatable, and the coaxial inner conductor is connected to the coaxial feed port of the first coaxial line on the other side of the metal cavity from the opposite side to the first coaxial line. A second coaxial line that is inserted into the above-mentioned metal cavity so as to be shifted from the center of the axis so that it does not come into contact and overlap with an interval in the axial direction to form a coaxial feed probe with a line length of about / 4 When,

Non-contact mouth overnight joint characterized by having.

2. a metal cavity having an inner diameter or waveguide width shorter than 1/4 of the wavelength of the transmitted signal and having at least a pair of opposing surfaces;

A coaxial outer conductor was fixed to one of a pair of opposing surfaces of the metal cavity, and a coaxial inner conductor was inserted into the metal cavity to form a coaxial power supply probe having a line length of about λ / 4. 1 coaxial line,

A metal plate that is rotatably arranged substantially parallel to the other outside of the pair of opposing surfaces of the metal cavity and that has a gap between the metal cavity surface and a choke structure having a length of about 4 people. When,

An outer coaxial conductor is fixed to the metal plate from the side opposite to the first coaxial line so as to be rotatable together with the metal plate, and an inner coaxial conductor is connected to the coaxial power supply probe of the first coaxial line. It is provided so that the shaft center is shifted so that it does not contact and penetrates the metal plate so as to overlap with an interval in the axial direction, and is inserted into the metal cavity to form a coaxial power supply probe with a line length of about / 4. A second coaxial line,

Non-contact mouth overnight joint characterized by having.

3. The non-contact port overnight join according to claim 1 or 2, wherein the coaxial power supply probe of the second coaxial line is disposed at the center of the metal cavity. ho

4. The non-contact aperture joint according to claim 3, wherein a dielectric spacer is entirely inserted into a gap between the surface of the metal cavity and the metal plate.

5. The metal cavity shape is a columnar shape and the metal plate is a disk shape, and the metal plate has a bent portion which is bent so as to extend a tip and provide a gap between the metal plates along the metal cavity shape. The non-contact solder joint according to any one of claims 2 to 4, wherein a dielectric spacer is provided between the bent portion and the metal cavity.

6. The metal cavity shape is a columnar shape and the metal plate is a disk shape, and the metal plate has a bent portion which is bent so as to extend a tip and provide a gap therebetween along the metal cavity shape. The metal cavity has a flange portion that is bent outward and extends outside the bent portion of the metal plate, and a bearing is inserted into the gap between the bent portion and the root of the bent portion, The non-contact port according to any one of claims 2 to 4, wherein a distance from the center of the coaxial inner conductor of the coaxial line of (2) to the bearing is set to about 1/2. One joint.

7. The joint according to claim 1, wherein a tip of the coaxial power supply probe is thickened.

8. The non-contact port overnight join according to any one of claims 1 to 6, wherein a small metal plate is loaded at the end of the coaxial power supply probe and the capacity is loaded.

9. The non-contact port joint according to claim 1, wherein a tip of the coaxial power supply probe of the first coaxial line is short-circuited inside the metal cavity.

10. The non-contact opening / joint according to any one of claims 1 to 9, further comprising an impedance matching mechanism for changing a space shape in the cavity.

1 1. Opposed to each other to form a space whose inner diameter is shorter than 1/2 of the wavelength of the transmission signal inside, each having a different diameter consisting of a circular bottom surface and side surfaces extending along the circumference. Two metallic lip-shaped members; A coaxial outer conductor was fixed on the bottom surface of one of the metal-shaped members, and a coaxial inner conductor was inserted into the metal cavity to form a coaxial feed probe with a line length of about λ / 4. A first coaxial line,

The coaxial outer conductor is rotatable on the bottom surface of the other metal forceps-shaped member from the side opposite to the first coaxial line so that the coaxial inner conductor does not contact the coaxial power supply probe of the first coaxial line. A second coaxial line inserted in the metal cavity so as to be offset from the axis and overlap with an interval in the axial direction and provided to form a coaxial feed probe having a line length of about / 4,

A dielectric spacer provided in a gap between the side surfaces of the two metallic lip-shaped members,

Non-contact mouth overnight joint characterized by having.