JP3379430B2 - Ridge waveguide - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ridge waveguide used in an ECM device which requires good broadband characteristics.

[0002]

2. Description of the Related Art FIG. 14 is, for example, issued in March 1964.
It is sectional drawing which shows the ridge waveguide called the conventional ridge horn shown on pages 96-101 of the microwave journal. In FIG. 14, 1 is a pyramid horn, 2 is a ridge mounted inside the pyramid horn 1 at positions facing each other, and 3 is a coaxial plug for supplying high frequency power to the pyramid horn 1. FIG. 15 is a cross-sectional view corresponding to line BB in FIG. In FIG. 15, S is the ridge width, and D is the gap length between the ridges 2 facing each other.

Next, the operation will be described. The high-frequency power supplied from the coaxial plug 3 is converted from the coaxial mode to the waveguide mode in the traveling direction of the coaxial plug 3 and at the central portion on the X axis of the pyramid horn 1. At this time, coaxial plug (eg 50Ω)
Due to the difference in characteristic impedance between 3 and the ridge waveguide (for example, 100Ω), large reflection occurs at the conversion portion. The high frequency power converted into the waveguide mode without being reflected propagates through the line and radiates a radio wave from the opening surface 1a of the pyramid horn 1.

[0004]

Since the ridge waveguide is considered to be the same as the parallel line, its characteristic impedance is expressed as follows. Z∝1 / C ... (1) C = εo × (S / D) Z: Characteristic impedance C: Capacitance εo: Dielectric constant S : Ridge width D: Gap length Since the conventional ridge waveguide has the structure as described above, the ridge width S is required for impedance matching with the coaxial plug 3.
However, if the ridge width S is widened or the gap length D is long, the cutoff frequency is increased, the power resistance is weakened, and the electrical performance is improved. There was a problem of deterioration.

The present invention has been made in order to solve the above problems, and impedance matching can be achieved without deteriorating the electrical performance. Conversely, in the impedance matching state, the cutoff frequency is The purpose is to obtain a ridge waveguide that can be lowered and improved withstand power.

[0006]

A ridge waveguide according to the invention of claim 1 is a ridge waveguide comprising a waveguide and two ridges mounted inside the waveguide at positions facing each other. In the pipe, the tip shapes of the two ridges facing each other are made into a set of concavo-convex shapes.

A ridge waveguide according to a second aspect of the present invention is a ridge waveguide comprising a waveguide and two ridges mounted inside the waveguide at positions that face each other. It is characterized in that the tip shapes of the two ridges are made into a plurality of sets of uneven shapes.

A ridge waveguide according to a third aspect of the present invention is a ridge waveguide and a ridge waveguide mounted on the waveguide at a position facing each other inside the waveguide.
In a ridge waveguide consisting of two ridges, the two ridges facing each other have a wavy shape.

A ridge waveguide according to a fourth aspect of the present invention is a ridge waveguide comprising a waveguide and four ridges attached to the inside of the waveguide so as to face each other. The four ridges are formed in the shape of an arrow.

A ridge waveguide according to a fifth aspect of the present invention is a ridge waveguide comprising a waveguide and four ridges attached to the inside of the waveguide at positions that face each other. It is characterized in that the tip shapes of the four ridges are formed into a step shape.

A ridge waveguide according to a sixth aspect of the present invention is a ridge waveguide including a waveguide and four ridges mounted in positions inside the waveguide so as to face each other. It is characterized in that the tip shapes of the four ridges are formed in a wave shape.

A ridge waveguide according to a seventh aspect of the present invention is a ridge waveguide comprising a waveguide and two ridges attached to the inside of the waveguide so as to face each other. The tip shapes of the two ridges are wider than the peripheral ridge width, and the peripheral ridge width is narrower than the dimension obtained when the impedance matching state and the cutoff frequency are constant.

A ridge waveguide according to an eighth aspect of the present invention is a ridge waveguide comprising a waveguide and four ridges attached to the inside of the waveguide so as to face each other. It is characterized in that the tip shapes of the four ridges are wider than the peripheral ridge width, and the peripheral ridge width is narrower than the dimension obtained when the impedance matching state and the cutoff frequency are constant.

A ridge waveguide according to a ninth aspect of the present invention is a ridge waveguide including a waveguide and two ridges attached to the inside of the waveguide so as to face each other. The tip shapes of the two ridges are wider than the peripheral ridge width, and the gap length between the ridges facing each other is longer than the dimension obtained when the impedance matching state and the cutoff frequency are constant.

The ridge waveguide according to the invention of claim 10 is
In a ridge waveguide consisting of a waveguide and four ridges mounted at positions facing each other inside the waveguide, the tip shape of the four ridges facing each other is made wider than the peripheral ridge width. The gap length between the ridges that face each other is set to be longer than the dimension obtained when the impedance matching state and the cutoff frequency are constant.

The ridge waveguide according to the invention of claim 11 is
It is characterized in that the dielectric is inserted and mounted only between the tips of the two ridges facing each other according to any one of claims 1 to 3, claim 7, and claim 9 .

The ridge waveguide according to the invention of claim 12 is
It is characterized in that the dielectric is inserted and mounted only between the tips of the four ridges which are opposed to each other according to any one of claims 4 to 6, claim 8 and claim 10 .

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a ridge waveguide according to a first embodiment of the present invention, wherein FIG. 1A is a longitudinal sectional view taken along the axial direction,
FIG. b is a cross-sectional view corresponding to line AA in FIG. Figure 1
In FIG. 1 a, 1 is a pyramid horn, 2 is a ridge made of metal attached inside the pyramid horn 1 at opposite positions, and 3 is a coaxial connector for supplying high frequency power to the pyramid horn 1. In FIG. 1 b, the tip shape 2 a of the ridge 2 which is relatively facing is formed into a pair of concave and convex shapes which extend in the X-axis direction of the pyramid horn 1 and which are facing each other.
In the first embodiment, the tip shape 2a of one ridge 2 is formed.
And the concave shape that is the tip shape 2a of the other ridge 2 forms one valley shape, and the ridge surface 2b that faces the tip shapes 2a of both ridges 2 relative to each other.
Can be made large, thereby reducing the characteristic impedance of the ridge waveguide. S is the ridge width, D is the gap length between the opposing ridges 2, and εo is the dielectric constant of the gap.

Next, the operation will be described. The characteristic shape of the ridge waveguide is made small by taking a large ridge surface 2b having a pair of concavo-convex shapes in which the tip shapes 2a of the ridges 2 which face each other face each other. For this reason,
The characteristic impedance of the ridge waveguide approaches the characteristic impedance of the coaxial plug 3. Therefore, when the high-frequency power supplied from the coaxial plug 3 is converted from the coaxial mode to the waveguide mode in the traveling direction of the coaxial plug 3 and at the center of the pyramid horn 1 on the X-axis, the reflection is small. . Then, except for a small amount of reflected radio waves, the high frequency power converted into the waveguide mode propagates through the line and radiates the radio waves from the opening surface 1 a of the pyramid horn 1.

In the first embodiment, the tip shape 2a is a pair of a mountain shape and a valley shape. However, as shown in the second embodiment of FIG. 2, the tip shape 2c of the ridge 2 which is relatively facing has a ridge width S. The same can be applied even if the ridge surface 2b is enlarged as a plurality of sets of concavo-convex shapes juxtaposed in the direction.

In the second embodiment, the tip shape 2c has a plurality of sets of concave and convex shapes. However, as shown in the third embodiment of FIG. 3, the tip shape 2d of the ridges 2 which face each other extends in the direction of the ridge width S. Even if the ridge surface 2b is made large as a continuous wave shape, it can be similarly applied.

In the third embodiment, the tip shape 2c has a wavy shape, but as shown in the fourth embodiment of FIG. 4, the tip shape 2e of the ridge 2 which is relatively facing is wider than the peripheral ridge width S. Even if the ridge surface 2b is made large and has a flat shape, it can be similarly applied.

Although the double ridge waveguide is used in the first to fourth embodiments, a ridge 2 is provided in a quad ridge waveguide having four ridges 2 facing each other as shown in the fifth embodiment of FIG. Even if the ridge surface 2b is made large by making the tip shape 2f of the taper shape of the arrow shape, the same can be applied.

In the fifth embodiment, the tip shape 2f is indicated by an arrow, but as shown in the sixth embodiment of FIG. 6, the tip shapes 2g of the four ridges 2 facing each other are stepwise and the ridge surface 2b is enlarged. However, the same applies.

In the sixth embodiment, the tip shape 2g has a step shape, but as shown in the seventh embodiment of FIG. 7, the tip shapes 2h of the four ridges 2 facing each other are corrugated to form the ridge surface 2b. Even if it is large, it can be applied in the same manner.

In the first to seventh embodiments, the tip shape 2a,
Although the ridge surface 2b is enlarged by 2c to 2h, as shown in the eighth embodiment in FIG. 8, the dielectric 4 having the dielectric constant εr is provided in the gap between the ridges 2 which face each other.
Even if the ridge waveguide characteristic impedance is reduced by inserting and mounting so as to make contact with, and increasing the dielectric constant in the gap, the same application is possible.

Although the double ridge waveguide is used in the eighth embodiment, as shown in the ninth embodiment of FIG. 9, the permittivity εr is set in the gap between the four ridges 2 of the quad ridge waveguide which face each other. The same can be applied by inserting and mounting the dielectric body 4 to be in contact with each ridge surface 2b.

In the fourth embodiment, the tip shape 2e has a flat shape that is wider than the peripheral ridge width S.
As shown in the tenth embodiment of the present invention, the ridge width S'in the vicinity of the tip shape 2i of the ridge 2 which relatively faces is narrowed (S '<S), and the cutoff frequency depending on the narrow ridge width S'is lowered. By doing so, in addition to the above-described effect that the tip shape 2i is widened with respect to the ridge width S ′, excellent radio waves of low frequencies can be transmitted.

In the tenth embodiment, the double ridge waveguide is used. However, as shown in the eleventh embodiment of FIG. 11, in the quad ridge waveguide, the ridge around the tip shape 2j of the ridge 2 having the arrow shape. The same can be applied when the width S ′ is narrowed.

In the eleventh embodiment, the ridge width S'is made narrower, but as shown in the twelfth embodiment of FIG. 12, the gap length D'is made longer by making the relative ridge surface 2b larger. By increasing the withstand power depending on the long gap length D ′, in addition to the effect of widening the tip shape described above, it is possible to favorably transmit even high-power radio waves.

In the twelfth embodiment, the double ridge waveguide is used. However, as shown in the thirteenth embodiment of FIG. 13, in the quad ridge waveguide, the ridge surface 2 facing each other is formed.
The same can be applied even if the gap length D ′ is lengthened by increasing b.

Although the ridge waveguide has a rectangular shape in the first to thirteenth embodiments, it may have a circular shape or a rhombic shape, for example.
Other shapes may be used. Further, although the coaxial connector 3 is used for power supply, other components such as a waveguide may be used. Further, although the power feeding is performed at right angles, any power feeding form such as backward power feeding may be used. Further, although the component is a horn, it may be a conversion unit to another component such as R / J.

[0033]

As described above, claims 1 to 6 and claim 1
According to the first and the twelfth aspects of the present invention, by widening the ridge surface at the tip of the ridge that relatively faces, there is an effect that impedance matching can be appropriately achieved even with an arbitrary connecting component.

The claimed according to the invention of claim 7 to 8, a phase by which shorter than the original required dimensions of the ridge width of the periphery of the facing ridge tip, wide-band and low cut-off frequency in the impedance matching state There is an effect that can be achieved.

According to the inventions of claims 9 to 10 , there is an effect that the withstand power can be improved by making the gap length between the ridges facing each other longer than the originally required dimension.

[Brief description of drawings]

1A and 1B show a ridge waveguide according to a first embodiment of the present invention, wherein FIG. 1A is a vertical sectional view and FIG. 1B is a sectional view taken along line AA of FIG. 1A.

FIG. 2 is a cross-sectional view showing a ridge waveguide according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a ridge waveguide according to a third embodiment of the present invention.

FIG. 4 is a transverse sectional view showing a ridge waveguide according to a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a ridge waveguide according to a fifth embodiment of the present invention.

FIG. 6 is a transverse sectional view showing a ridge waveguide according to a sixth embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a ridge waveguide according to a seventh embodiment of the present invention.

FIG. 8 is a transverse sectional view showing a ridge waveguide according to an eighth embodiment of the present invention.

FIG. 9 is a transverse sectional view showing a ridge waveguide according to a ninth embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a ridge waveguide according to a tenth embodiment of the present invention.

FIG. 11 is a cross-sectional view showing a ridge waveguide according to an eleventh embodiment of the present invention.

FIG. 12 is a cross-sectional view showing a ridge waveguide according to a twelfth embodiment of the present invention.

FIG. 13 is a transverse cross-sectional view showing a ridge waveguide according to a thirteenth embodiment of the present invention.

FIG. 14 is a cross-sectional view showing a conventional ridge waveguide.

FIG. 15 is a cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

1 Pyramidal horn, 2 Ridge, 2a, 2c-2j Tip shape, 2b Ridge surface, 3 Coaxial plug, 4 Dielectric.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-198002 (JP, A) JP-A-47-11881 (JP, A) JP-A-7-336113 (JP, A) Sankaihei 2- 30616 (JP, U) Actual development Sho 58-59204 (JP, U) JP 30-6507 (JP, B1) JP 47-43509 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01P 3/123 H01P 5/103 H01Q 13/02

Claims (12)

(57) [Claims] 1. A ridge waveguide comprising a waveguide and two ridges mounted at positions facing each other inside the waveguide, wherein a tip shape of the two ridges facing each other is set as a set. A ridge waveguide characterized by having an uneven shape. 2. A ridge waveguide consisting of a waveguide and two ridges mounted at positions facing each other inside the waveguide, wherein a plurality of sets of tip shapes of the two ridges facing each other are provided. A ridge waveguide characterized by having an uneven shape. 3. A ridge waveguide consisting of a waveguide and two ridges mounted at positions facing each other inside the waveguide, wherein the tip shapes of the two ridges facing each other are corrugated. A ridge waveguide characterized in that 4. In a ridge waveguide comprising a waveguide and four ridges mounted at positions facing each other inside the waveguide, the tip shape of the four ridges facing each other is an arrow shape. A ridge waveguide characterized in that 5. In a ridge waveguide comprising a waveguide and four ridges mounted at positions facing each other inside the waveguide, a tip shape of the four ridges facing each other is a step shape. A ridge waveguide characterized in that 6. In a ridge waveguide comprising a waveguide and four ridges mounted at positions facing each other inside the waveguide, a tip shape of the four ridges facing each other is a wave shape. A ridge waveguide characterized in that 7. A ridge waveguide consisting of a waveguide and two ridges mounted at positions facing each other inside the waveguide, wherein a tip shape of the two ridges facing each other is a peripheral ridge. A ridge waveguide characterized in that it is wider than the width, and the ridge width around it is narrower than the dimension obtained when the impedance matching state and the cutoff frequency are constant. 8. A ridge waveguide consisting of a waveguide and four ridges mounted at positions facing each other inside the waveguide, wherein a tip shape of the four ridges facing each other is a peripheral ridge. A ridge waveguide characterized in that it is wider than the width, and the ridge width around it is narrower than the dimension obtained when the impedance matching state and the cutoff frequency are constant. 9. A ridge waveguide consisting of a waveguide and two ridges mounted at positions facing each other inside the waveguide, wherein a tip shape of the two ridges facing each other is a peripheral ridge. A ridge waveguide characterized in that it is wider than the width, and the gap length between the ridges facing each other is longer than the dimension obtained when the impedance matching state and the cutoff frequency are constant. 10. A ridge waveguide consisting of a waveguide and four ridges mounted at positions facing each other inside the waveguide, wherein the tip shape of the four ridges facing each other is a peripheral ridge. A ridge waveguide characterized in that it is wider than the width, and the gap length between the ridges facing each other is longer than the dimension obtained when the impedance matching state and the cutoff frequency are constant. 11. A dielectric material is inserted and mounted only between the tips of two ridges facing each other .
The ridge waveguide according to claim 3, claim 7, or claim 9 . 12. A dielectric material is inserted and mounted only between the tips of four ridges facing each other .
The ridge waveguide according to claim 6, claim 8, or claim 10 .