JP3422949B2 - Semicircular radial antenna - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to several GHz to several tens of GHz.
A semi-circular radial antenna with a wide-angle beam used in the Hz band.

[0002]

2. Description of the Related Art Conventionally, a horn antenna has been generally known as an antenna for radiating a radio wave of several GHz to several tens GHz in a beam form. Among these horn antennas, there is an H-plane fan-shaped horn antenna with vertical polarization as one having a wide-angle beam characteristic, that is, one having a widened H-plane. However, even in this H-plane fan-shaped horn antenna,
The radiation angle of the horizontal plane is limited to a half width of 70 ° to 80 °.

Depending on how the antenna is used, it may be desirable to further widen the radiation angle of the radio wave beyond the full width at half maximum of 70 ° to 80 °. In such a case, a wide-angle beam can be realized by combining two horn antennas.

[0004]

By combining two horn antennas as described above, it is possible to further widen the radiation angle of radio waves beyond the half width of 70 ° to 80 °. In this case, however, the transmission power is reduced. And a distributor for distributing and supplying the two horn antennas is required.
There is a problem that a supporting metal fitting for supporting the two horn antennas at predetermined positions is required, which is very expensive.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a semi-circular radial antenna capable of obtaining a radiation angle with a half width of about 120 °.

[0006]

A semi-circular radial antenna according to a first aspect of the present invention is a semi-circular radial antenna formed by arranging a semi-circular upper waveguide plate and a lower waveguide plate opposite to each other with a predetermined space therebetween. A waveguide, a short-circuit wall for short-circuiting the straight end portions of the upper waveguide plate and the lower waveguide plate, and a feeding means for feeding power to the semi-circular radial waveguide, and the circumference of the semi-circular radial waveguide.
A wide-angle beam is projected from a semi-circular opening formed along the surface.
It is characterized by emitting radio waves .

A semi-circular radial antenna according to a second aspect of the present invention is a semi-circular radial waveguide formed by arranging a semi-circular upper waveguide plate and a lower waveguide plate so as to face each other with a predetermined interval, and the upper portion. A short-circuit wall for short-circuiting the linear ends of the waveguide plate and the lower waveguide plate, and a dielectric material filled in the semi-circular radial waveguide,
And a power feeding means for feeding power to the semicircular radial waveguide, the power feeding means being formed along the circumferential surface of the semicircular radial waveguide.
A wide-angle beam of radio waves is emitted from the semicircular opening .

A semicircular radial antenna according to a third invention is characterized in that the dielectric in the second invention is extended from the inside of the semicircular radial waveguide to the outside of the opening.

A semi-circular radial antenna according to a fourth aspect of the present invention is a semi-circular radial waveguide formed by arranging a semi-circular upper waveguide plate and a lower waveguide plate facing each other with a predetermined space therebetween, First to short-circuit the linear ends of the waveguide plate and the lower waveguide plate
The short-circuit wall, a second short-circuit wall for short-circuiting the circumferential surface ends of the upper waveguide plate and the lower waveguide plate, and the second short-circuit wall radially provided at a predetermined interval, A plurality of radiating elements coupled to the radial waveguide and a feeding means for feeding the semicircular radial waveguide are provided, and the plurality of radiating elements are provided.
It is characterized by emitting a wide-angle beam of radio waves .

A semi-circular radial waveguide constituted by arranging a semi-circular upper waveguide plate and a lower waveguide plate facing each other at a predetermined interval according to the fifth aspect of the present invention, and the upper waveguide plate and the lower waveguide plate. A first short-circuit wall that short-circuits the straight end portions of the corrugated plate, a second short-circuit wall that short-circuits the circumferential surface end portions of the upper waveguide plate and the lower waveguide plate, and a predetermined short-circuit wall for the second short-circuit wall. a plurality of radiating slots disposed radially in the intervals, and a power supply means for supplying power to the semicircular radial waveguide, said plurality of radiating slots
A semi-circular radial antenna characterized by emitting a wider-angle beam of radio waves .

A semi-circular radial antenna according to a sixth aspect of the present invention is a semi-circular radial waveguide comprising a semi-circular upper waveguide plate and a lower waveguide plate arranged facing each other with a predetermined gap, First to short-circuit the linear ends of the waveguide plate and the lower waveguide plate
A short-circuit wall, a second short-circuit wall that short-circuits the circumferential end portions of the upper waveguide plate and the lower waveguide plate, and a second short-circuit wall on the upper waveguide plate and the lower waveguide plate. A plurality of radiating elements provided along the semicircular radial waveguide provided at predetermined intervals, a reflector provided inside the radiating elements on the upper waveguide plate and the lower waveguide plate, and And a power feeding means for feeding power to the semicircular radial waveguide.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a semicircular radial antenna 1 according to an embodiment of the present invention, and FIG. 2 is a transverse sectional view thereof. As shown in FIG. 1, a semi-circular upper waveguide plate 3 and a lower waveguide plate 4 are opposed to each other with a predetermined space, for example, a space of λ / 4 or less, and their bases (straight ends) are short-circuited. A short circuit is made by the wall 2, and a semicircular radial waveguide 10 is formed between the upper waveguide plate 3 and the lower waveguide plate 4. That is, the semicircular radial waveguide 10 is formed such that the base portion is short-circuited by the short-circuit wall 2 and the circumferential portion is open.

Then, the lower waveguide plate 4 is provided with a feeding portion (probe) 5 at a central position which is separated from the short-circuit wall 2 by a predetermined distance, for example, λ / 4. The upper waveguide plate 3 and the lower waveguide plate 4 are formed in a semicircular shape having a radius r with the feeding portion 5 as a starting point. The value of the radius r is set to 2λ, for example.

As the power feeding section 5, for example, a coaxial connector 6 as shown in FIG. 3 is used, and a power feeding pin is provided so as to project from the central portion thereof into the semicircular radial waveguide 10.

As another power feeding method, there is a method of using a power feeding waveguide 11 as shown in FIGS. In the method shown in FIG. 4, a power feeding through hole 12 having a predetermined size is provided at a power feeding position of the lower waveguide plate 4, and a power feeding waveguide 11 is provided below the lower waveguide plate 4. The distal end of the waveguide 11 for power supply is coupled to the through hole 12 for power supply to supply power. In the method shown in FIG. 5, four slots 13 are arranged in a rectangular shape in place of the through holes 12 for feeding,
The tip of the power feeding waveguide 11 is coupled to the slot 13 to feed power.

The upper waveguide 3 and the lower waveguide 4 are
6, the tip of the opening may be bent outward at an angle of about 45 °, for example. The length of this bent portion is, for example, about λ / 2 (center longest portion), and the distance at the tip of the opening at this time is about 1λ. By bending the opening tip portions of the upper waveguide plate 3 and the lower waveguide plate 4 outward as described above, the radio waves are radiated to the outside more efficiently.

The semicircular radial antenna 1 shown in FIG. 1 above.
In the semicircular radial waveguide 10 formed between the upper waveguide plate 3 and the lower waveguide plate 4, a circumferential electric field distribution as shown in FIG. 7 is generated. That is, in the semicircular radial antenna 1 configured as described above, since the magnetic field on the aperture is directed in the circumferential direction of the semicircular radial waveguide 10, it is a wide-angle beam, which is also clear from the electric field distribution in FIG. 7. Thus, a radiation angle with a half width of 120 ° can be obtained.

As a concrete example, the radius r of the semicircular radial antenna 1 is about 50 mm, the upper waveguide plate 3 and the lower waveguide plate 4 are arranged.
And the distance h between them is 6.3 mm, and the length of the power supply unit 5 is 4.1 mm.
Was manufactured and an experiment was conducted at a frequency of 12.5 GHz, the radiation characteristics shown in FIG. 8 were obtained. FIG. 8 shows a relative power value (dB) with respect to each angle φ in the left-right direction, where the radiation angle from the power feeding unit 5 to the central portion (x direction) in FIG. 2 is 0 ° (deg). .

Next, another embodiment of the present invention will be described. 9 (a) to 9 (d) show another embodiment of the present invention. In FIG. 9A, a peripheral surface short-circuit wall 21 is provided along the circumference between the upper waveguide plate 3 and the lower waveguide plate 4, and the peripheral surface short-circuit wall 21 is provided with, for example, a patch element or a helical element. A plurality of radiating elements 22 and probes are radially provided at a predetermined interval. That is, a plurality of radiating elements 22 are radially provided with reference to the position O of the feeding portion provided at a position λ / 4 from the short-circuit wall 2, and the radiating element 22 is fed with power by the probe inserted in the semicircular radial waveguide. I am doing it.

In FIG. 9B, a plurality of radiation slots 23 are formed in the peripheral short-circuit wall 21 instead of the radiation element 22 of FIG. 9A.
Are provided at predetermined intervals.

In FIG. 9C, a plurality of monopole elements (radiating elements) 24 are provided at predetermined intervals inside the outer peripheral edges of the upper waveguide plate 3 and the lower waveguide plate 4 by about λ / 4, and A reflecting plate 25 is provided in a semicircular shape inside the monopole element 24.

In FIG. 9D, the semicircular radial waveguide 10 is opened as shown in FIG. 1 and the dielectric 31 is filled in the semicircular radial waveguide 10.
In this case, the dielectric 31 may be extended to the outside of the opening of the semicircular radial waveguide 10 to improve the gain. Further, the upper waveguide plate 3, the lower waveguide plate 4, and the short-circuit wall 2 may be formed by depositing metal on the surface of the semicircular dielectric 31.

[0024]

As described in detail above, according to the present invention, a semicircular upper waveguide plate and a lower waveguide plate are arranged to face each other with a predetermined space therebetween, and their bases are short-circuited by a short-circuit wall. Then, a semicircular radial waveguide is formed between the upper waveguide plate and the lower waveguide plate, and power is fed to the semicircular radial waveguide from the outside. A semi-circular radial antenna capable of obtaining a radiation angle can be provided.

Even if a peripheral surface short-circuit wall is provided in the opening of the semicircular radial waveguide and a radiating element is provided on the peripheral surface short-circuit wall or a waveguide plate forming the semicircular radial waveguide, the radiated radio wave can be emitted. It is possible to use a wide-angle beam.

[Brief description of drawings]

FIG. 1 is a perspective view of a semicircular radial antenna according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the same embodiment.

FIG. 3 is a diagram showing a power feeding portion in the same embodiment.

FIG. 4 is a diagram showing another example of a power feeding portion in the same embodiment.

FIG. 5 is a diagram showing still another example of a power feeding portion in the same embodiment.

FIG. 6 is a view showing a modified example of an upper waveguide plate and a lower waveguide plate forming a semicircular radial waveguide.

FIG. 7 is a view showing an electric field distribution in the semicircular radial waveguide according to the same embodiment.

FIG. 8 is a diagram showing a radio wave radiation characteristic in the same embodiment.

FIG. 9 is a perspective view showing a configuration of a semicircular radial antenna according to various embodiments of the present invention.

[Explanation of symbols] 1 ... Half-circle radial antenna 2 ... Shorting wall 3 ... Upper waveguide 4 ... Lower waveguide plate 5 ... Power supply unit 6 ... Coaxial connector 10 ... Semicircular radial waveguide 11 ... Waveguide for power feeding 12 ... Through hole for power feeding 13 ... Slot 21 ... Shorting wall 22 ... Radiating element 23 ... Radiation slot 24 ... Monopole element 25 ... Reflector 31 ... Dielectric

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01Q 13/18 H01Q 13/08

Claims (6)

(57) [Claims] 1. A semicircular radial waveguide formed by arranging a semicircular upper waveguide plate and a lower waveguide plate so as to face each other with a predetermined spacing, and a straight line between the upper waveguide plate and the lower waveguide plate. A short-circuit wall for short-circuiting the end portion, and a power feeding means for feeding power to the semi-circular radial waveguide, the circumferential surface of the semi-circular radial waveguide being provided.
Wide-angle beam radio waves from a semicircular opening formed along
Radial semi-circular antenna characterized by radiating . 2. A semicircular radial waveguide formed by arranging a semicircular upper waveguide plate and a lower waveguide plate so as to face each other with a predetermined spacing, and a straight line of the upper waveguide plate and the lower waveguide plate. A short-circuit wall for short-circuiting the end portion, a dielectric filled in the semi-circular radial waveguide, and a power feeding means for feeding the semi-circular radial waveguide, and a circumferential surface of the semi-circular radial waveguide. Along
Emit wide-angle beam radio waves from the formed semi-circular opening
A semi-circular radial antenna characterized by being . 3. The dielectric material extends from the inside of the semicircular radial waveguide to the outside of the opening.
The described semi-circular radial antenna. 4. A semi-circular radial waveguide formed by arranging a semi-circular upper waveguide plate and a lower waveguide plate facing each other with a predetermined spacing, and a straight line of the upper waveguide plate and the lower waveguide plate. A first short-circuit wall that short-circuits the ends, a second short-circuit wall that short-circuits the ends of the circumferential surfaces of the upper waveguide plate and the lower waveguide plate, and a radial pattern at a predetermined interval on the second short-circuit wall. provided, and a plurality of radiating elements that bind to the semicircular radial waveguide, comprising a feed means for feeding the said semicircular radial waveguide, release of the plurality
A semi-circular radial antenna characterized in that it emits a wide-angle beam of radio waves with a reflecting element . 5. A semicircular radial waveguide formed by arranging a semicircular upper waveguide plate and a lower waveguide plate so as to face each other with a predetermined spacing, and a straight line of the upper waveguide plate and the lower waveguide plate. A first short-circuit wall that short-circuits the ends, a second short-circuit wall that short-circuits the ends of the circumferential surfaces of the upper waveguide plate and the lower waveguide plate, and a radial pattern at a predetermined interval on the second short-circuit wall. A plurality of radiation slots and a power feeding means that feeds power to the semi-circular radial waveguide .
A semi-circular radial antenna that emits radio waves . 6. A semicircular radial waveguide formed by arranging a semicircular upper waveguide plate and a lower waveguide plate so as to face each other with a predetermined spacing, and a straight line between the upper waveguide plate and the lower waveguide plate. A first short-circuit wall for short-circuiting the end portions, a second short-circuit wall for short-circuiting the circumferential end portions of the upper and lower waveguide plates, and a second short-circuit wall on the upper and lower waveguide plates. A plurality of radiating elements that are provided along the second short-circuit wall at predetermined intervals and that are coupled to the semi-circular radial waveguide, and on the upper waveguide plate and the lower waveguide plate inside the respective radiating elements. A semi-circular radial antenna comprising: a reflector provided; and a feeding means for feeding the semi-circular radial waveguide.