JP3175325B2 - Variable phase shifter 4 distributor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of distributing power of a high-frequency signal to four, and having a phase difference of -3 for the distributed signal.
The present invention relates to a variable phase shifter that appears at regular intervals of δ, −δ, δ, and 3δ and can continuously change the phase difference δ. Using this variable phase shifter, a variable phase feeder capable of continuously changing the beam tilt angle (directivity) of the array antenna can be configured.

[0002]

2. Description of the Related Art Conventionally, in order to change the beam tilt angle of an array antenna, the length of a cable for feeding a high-frequency signal distributed by a power distributor to each array antenna element is changed. The taper of the phase distribution of a high-frequency current has been changed.

[0003] Further, a cable having the same length and a phase shifter inserted between a power distributor and an array antenna is also used in a phased array antenna or the like.

[0004]

In order to change the phase shift amount by changing the length of the cable, for example, when the power supply device is installed outdoors, the waterproofing portion is removed and the cable is removed from the connector. In this case, it is necessary to replace the cable with a different length or cut the cable itself to shorten the length, and to perform the work of attaching and waterproofing the connector again.

[0005] In the power supply device using the phase shifter,
If the phase is to be changed continuously or at a fine pitch, a large number of switches and cables are required, the size is increased, and the cost is increased. In addition, since the switch has mechanical contacts, there is a possibility that a contact failure occurs due to aging, which causes intermodulation and noise.

Accordingly, an object of the present invention is to solve the above-mentioned technical problems, and to realize a power 4 by a simple and highly reliable structure.
An object of the present invention is to provide a variable phase-shifting four-way splitter capable of performing splitting and continuously changing a phase difference of a split signal.

[0007]

According to a first aspect of the present invention, there is provided a variable phase shifter comprising a stator and a rotor, wherein the stator comprises: An arc-shaped conductor having a radius a centered on one point O, and a finite-length conductor extending from the center of the arc toward the outside or inside of the arc along a normal passing through the center, An input-side strip conductor having an end of the long conductor as an input end, and (b) a line-symmetrically disposed with respect to the normal, and centered on the one point O, which is larger than a radius a of an arc of the input-side strip conductor. A rotor having a small radius b and two output-side strip conductors having output ends at both ends of each arc is disposed on a substrate. A first strip conductor having a semicircular arc shape with a radius a,
(d) Radius b centered at one point O ', arranged symmetrically with respect to a normal passing through the center of the arc of the first strip conductor
Arc-shaped second and third strip conductors, and (e) two finite length conductors extending from both ends of the first strip conductor toward the center and intersecting with the second and third strip conductors. The one point O and the one point O 'coincide with each other, and the rotor can be rotated while an insulator is interposed between the stator and the rotor.

[0008]

According to the structure of the first aspect, the high-frequency signal input from the input end of the input-side strip conductor is distributed to the arc-shaped conductor, and the first strip conductor of the rotor is interposed via the insulator. Is combined with And from both ends of the first strip conductor through the finite length conductor respectively, distributed in both directions of the third strip conductor, via the insulator,
Since the power reaches each output end of the two output-side strip conductors of the stator, four power distributions are possible.

When the rotor is rotated, the distance from the input end of the input-side strip conductor to each output end of the two output-side strip conductors changes at equal intervals, and the distance difference is proportional to the rotation angle. I do. Therefore, it is possible to make the phase difference between the divided signals equal intervals, and to continuously change the phase difference.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is an exploded perspective view of the variable phase-shifting four-way distributor according to the embodiment. The variable phase shifter includes a stator 5 having an input strip conductor 1 and two output strip conductors 2 and 3 arranged on a printed circuit board 4, and an insulator plate 6 on the stator 5. And a rotor 7 that slides therethrough.

The input-side strip conductor 1 of the stator 5 comprises an arc-shaped conductor 11 and a finite-length conductor 12 connected to the conductor 11 at the center of the arc and extending in the normal direction. An end of the conductor 12 is an input end A. The finite-length conductor 12 has some inductance, and performs impedance matching by resonating with the capacitance of the insulator plate 6.

The output side strip conductors 2 and 3 have a radius b substantially half the radius a of the arc of the input side strip conductor 1.
And is disposed symmetrically with respect to a normal X along the finite length conductor 12. The arc of the input-side strip conductor 1 and the output-side strip conductor 2,
The arc 3 shares the center O. Further, both ends of each arc of the output side strip conductors 2 and 3 are output ends B and
C, D, and E.

The finite length conductor 12 of the input strip conductor 1
Is selected to have a characteristic impedance of 50Ω, and the arc-shaped conductor 11 has a characteristic impedance of 100Ω.
The width was chosen to be Ω. Therefore, in the arrangement of the embodiment in which the arc-shaped conductor 11 is connected to the finite-length conductor 12 in parallel on the left and right, impedance matching can be achieved. The width of the output-side strip conductors 2 and 3 is selected so that the characteristic impedance becomes 200Ω.

On the other hand, the rotor 7 is provided with an arc-shaped first sliding conductor 14 having a radius a, a high-dielectric-constant insulator plate 6 made of an insulating material of a general high-frequency electric wire such as polyfluoroethylene, and the like. b, the second and third sliding conductors 15 and 16 having an arc shape and extending in the normal direction from both ends of the first sliding conductor 14, and a central portion of the second and third sliding conductors 15 and 16. The two finite conductors 1 connected to these second and third sliding conductors 15 and 16
7 and 18, and the first sliding conductor 14 and the second and third sliding conductors 15 and 16 share the center O 'of the arc.

The center O of the arc of the strip conductor of the stator 5 coincides with the center O 'of the arc of the rotor 7;
The rotor 7 is rotatable around the center. An arc-shaped first sliding conductor 14 and a finite-length conductor 17,
Reference numeral 18 designates a width so that the characteristic impedance becomes 100Ω, and the arc-shaped second and third sliding conductors 15, 16
Is selected such that the characteristic impedance becomes 200Ω. Therefore, in the arrangement of the embodiment in which the arc-shaped conductors 15 and 16 are connected to the finite-length conductors 17 and 18 respectively on the left and right, impedance matching can be achieved.

According to the structure described above, the high-frequency signal input from the input end A of the input-side strip conductor 1 is divided into two parts at the joint with the arc-shaped conductor 11, and the rotor 7 is connected via the insulator plate 6. Are connected to the first sliding conductor 14 having an arc shape. Then, the light is split into two portions again at the coupling portions with the second and third sliding conductors 15 and 16 through the finite length conductors 17 and 18. Further, they are respectively coupled to the two output side strip conductors 2 and 3 of the stator 5 via the insulator plate 6, and are taken out from the output ends B, C, D and E (see FIG. 2).

When the rotor 7 is rotated by the rotation angle θ (see FIG. 3), the distance between the input end A of the input-side strip conductor 1 and the output ends B, C, D and E of the arc-shaped conductors 15 and 16 is increased. The distances are L− (3/2) ΔL, L− (1/2) ΔL, L +
(1/2) ΔL, L + (3/2) ΔL. Here, L is the distance from the input end A to the output ends B, C, D, and E when the rotation angle θ = 0, and ΔL = aθ. However, a = 2b. Therefore, there is a certain difference between the outputs appearing at the output terminals B, C, D, and E, and the difference appears in proportion to the rotation angle θ of the rotor 7.

As a result, phase differences appear at equal intervals in the distributed signal, and the phase differences can be continuously changed.
Next, an impedance matching method will be described. The impedance at the input terminal A of the variable phase shifter is 50
Ω, output terminals B, C, D and E have an impedance of 200Ω
(See FIG. 4), but the input terminal A also has the output terminals B, C,
If D and E are also required to be equal to 50Ω, it is necessary to provide a quarter-wave impedance transformer in the strip conductor. Therefore, as shown in FIG.
It is preferable that the characteristic impedance of the first sliding conductor 14 is 25Ω, and a quarter-wave impedance transformer of √ (50 × 12.5) Ω is provided in the middle of the finite length conductor 12. As a result, the capacitance between the strip conductor and the ground can be compensated and impedance matching can be achieved.
Loss of distribution can be prevented. As shown in FIG. 6, the characteristic impedance of the arc-shaped conductor 11 is set to 100Ω.
In the middle of the first sliding conductor 14, √ (100 × 25)
A quarter-wave impedance transformer of Ω may be provided. Further, as shown in FIG. 7, a quarter-wave impedance transformer of √ (200 × 50) Ω may be provided in the middle of each of the output-side strip conductors 2 and 3.

[0019]

As described above, the variable phase shifter 4 according to claim 1 is used.
According to the distributor, the phase of the output high-frequency signal can be tapered while the power of the input high-frequency signal is distributed to four, and the phase difference can be continuously changed. Thereby, the beam tilt angle of the linear antenna array can be continuously changed.

Further, since the strip conductor of the stator and the strip conductor of the rotor slide with the insulator interposed therebetween, noise is generated due to the sliding, noise is generated due to poor contact of the conductor due to aging, and mutual noise is generated. Modulation can be prevented from occurring. In addition, since the variable phase shifter can be configured using a strip line or the like, the size and weight can be reduced.
And the manufacture becomes easy.

Further, since the power four-way distributor and the phase shifter are integrally formed, the number of parts is small, the reliability is improved, and the device can be made compact. Therefore, it is extremely effective to use the antenna as an antenna power supply device when the service area needs to be changed at any time with an antenna of a mobile communication base station or the like.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a variable phase-shift four distributor according to an embodiment.

FIG. 2 is a circuit diagram of a variable phase-shift four distributor.

FIG. 3 is a circuit diagram when a rotor is rotated by an angle θ.

FIG. 4 is a diagram showing the characteristic impedance of each conductor of the variable phase-shift four-divider.

FIG. 5 is a circuit diagram of a variable phase-shifting four-way distributor in which the impedance on the output side is matched using an impedance transformer.

FIG. 6 is a circuit diagram of a variable phase-shifting four-divider in which the impedance on the output side is matched using an impedance transformer.

FIG. 7 is a circuit diagram of a variable phase-shift four-way distributor in which the impedance on the output side is matched using an impedance transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Input-side strip conductor 2 Output-side strip conductor 3 Output-side strip conductor 4 Substrate 5 Stator 6 Insulator 7 Rotor 11 Arc-shaped conductor 12 Finite-length conductor 14 First strip conductor 15, 16 Second, third Strip conductor 17, 18 Finite length conductor A Input end B, C, D, E Output end

────────────────────────────────────────────────── (5) References JP-A-5-121915 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01P 5/16 H01P 5/04 603

Claims (1)

(57) [Claims] 1. A variable phase-shifting four-way distributor including a stator and a rotor, wherein the stator comprises: an arc-shaped conductor having a radius a centered on one point O; and a normal from a center of the arc. A finite-length conductor extending toward the outside or inside of the arc along the, the input-side strip conductor with the end of this finite-length conductor as the input end, and disposed symmetrically with respect to the normal, Two output strip conductors having an arc having a radius b smaller than the radius a of the arc of the input side strip conductor centered at one point O, and having both ends of each arc as output ends; The rotor is composed of a first strip conductor having a semicircular arc shape having a radius a centered on one point O ′, and a line extending with respect to a normal passing through the center of the arc of the first strip conductor. The symmetrical arc-shaped arc with a radius b centered at one point O ' A second and a third strip conductor, and two finite length conductors extending in the center direction from both ends of the first strip conductor and intersecting the second and third strip conductors; A variable phase-shifting four-way distributor, wherein one point O and one point O 'coincide with each other, and the rotor is rotatable while an insulator is interposed between the stator and the rotor.