JPH0794903A - Nrd guide curve circuit - Google Patents

Abstract

PURPOSE:To reduce the size of a circuit and to improve the degree of freedom for the connection of lines in the case of wiring a continuous curved line by means of an NR guide. CONSTITUTION:In an NRD guide curve circuit constituted of upper and lower conductor plates and a dielectric line material for transmitting a signal arranged between the upper and lower conductor plates and having an NRD guide setting up an interval between the upper and lower conductor plate to a value less than the half wavelength of frequency to be used for the upper and lower conductor paltes on the outside of the dielectric line material as a principle, the radius of curvature of a dielectric line constituting a bend with a bend angle ntheta (n) is a positive integer and theta is an angle) is Rntheta and a bend with the radius Rntheta of curvature is divided into (n) divided small bend parts 101 with an angle thetaand the (n) bend parts 101 are continuously connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION This invention relates to an NRD guide (No.
n Radiative Dielectric Wa
ve Guide: Non-radiative dielectric line) NR
The present invention relates to a D guide curve circuit.

[0002]

2. Description of the Related Art Generally, a high-frequency linear line using a dielectric has a lower loss as the frequency becomes higher.
It is known that the loss is extremely low in millimeter waves and the like.
However, if the track has bends,
The signal transmitted through the straight line is radiated to the outside of the line, and the signal power transmitted via the dielectric line bend is extremely small.

Therefore, as a solution to this, as shown in FIG. 9, a dielectric line material for signal transmission having a cross section of height a × width b between an upper conductor plate 901 and a lower conductor plate 902. 9
03 is arranged to form the NRD guide, and the distance between the upper conductor plate 901 and the lower conductor plate 902 (that is, the height a).
The upper conductor plate 901 and the lower conductor plate 9 outside the dielectric line member 903.
There is provided an NRD guide curve circuit capable of obtaining a lossless bend under a certain condition by setting the frequency to be 1/2 wavelength or less of the used frequency in the section 02.

In the NRD guide curve circuit shown in FIG. 9, the relative permittivity depending on the material of the dielectric line material, the line cross-sectional dimension (height a × width b) and the bend angle θ ₀ are determined and shown in Table 1 below. Although the bend radii are discretized according to the bend angles, a lossless bend with no loss due to the bend can be realized. It should be noted that Equation 1 shows the formula for calculating the radius of curvature R for each bend angle that constitutes the lossless bend.

[0005]

[Table 1]

[0006]

[Equation 1]

FIGS. 10 and 11 show the conventional NR.
An example of venting of a D-guide curve circuit is shown in FIG.
A 0 ° bend and a 180 ° bend are shown in FIG. 10B. Reference numeral 1001 is a bend portion, and 1002 is a dielectric straight line portion. Further, FIG. 11A shows an example in which two 90 ° bends are used to form a 180 ° bend, and FIG.
(B) is an example of configuring an "S-shaped" circuit by using two 90 ° bends. The upper and lower conductor plates are not shown for simplicity of description.

[0008]

However, in such a conventional NRD guide curve circuit, the above-mentioned Table 1 is used.
As shown in FIG. 3, since it is not possible to take an arbitrary radius of curvature at each bend angle, there is a problem that the degree of freedom of wiring when wiring the NRD guide is extremely poor.

For example, according to the above conventional concept, when the NRD guide is wired in a "U" shape or an "S" shape,
In the case of the “U-shaped” type, a method of using a 180 ° bend with a small radius of curvature as shown in FIG. 10B, and FIG.
There are two degrees of freedom, such as the method of arranging two 90 ° bends having a larger radius of curvature than a 180 ° bend like
In the case of "shape" type, two 90 ° bends are lined up to form "S shape"
Since there is only a method of connecting to the mold and the problem that the whole circuit configuration scale becomes large, a line with a necessary bend angle must be designed every time, and the radius of curvature changes depending on the bend angle. However, when designing the line connection by determining the input / output coordinates of the entire composite circuit by the NRD guide, there is a problem that the degree of freedom in wiring design is small.

The present invention has been made in view of the above, and divides a bend having a constant radius of curvature designed by an NRD guide with an arbitrary bend angle into n and dividing the bend into n small bends. The purpose is to expand the degree of freedom in wiring design by using one line to make one continuous curved line wiring.

[0011]

In order to achieve the above object, the present invention forms an NRD guide by arranging a dielectric transmission line material for signal transmission between upper and lower conductor plates, and further comprises the upper and lower conductor plates. In the NRD guide curve circuit in which the distance between the NRD guides is set to be equal to or less than a half wavelength of the frequency used between the upper and lower conductor plates outside the dielectric line material, the NRD guide has a bending angle n.
Let Rnθ be the radius of curvature of the dielectric line material that constitutes a bend of θ (n is a positive integer, θ is an angle), and divide one bend of curvature of Rnθ into n number of divided small bends of angle θ. The present invention provides an NRD guide curve circuit in which divided small bend portions divided into n pieces are arbitrarily and continuously connected.

The NRD guide has a length P · λg / 2 (where λg is an in-line wavelength) between the divided small bend portions and the divided small bend portions and having the same line sectional shape as the divided small bend portions. , P is a positive integer) and a linear dielectric line member is inserted to form a linear portion.

[0013]

In the NRD guide curve circuit according to the present invention, the dielectric line material for signal transmission is arranged between the upper and lower conductor plates to reduce the NR.
A dielectric that forms a D guide, and sets the interval between the upper and lower conductor plates to be less than or equal to a half wavelength of the frequency used between the upper and lower conductor plates outside the dielectric line material to form a bend with a bending angle nθ of the NRD guide. The radius of curvature of the line material is Rnθ, and one Rn
The bend of the curvature of θ is divided into n divided small bends with an angle of θ, and the divided small bends divided into n are continuously connected arbitrarily to form a continuous curve of one stroke. Conduct track wiring.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory diagram showing a main configuration of an NRD guide curve circuit according to the present invention, and FIG.
Shows an example of "S-shaped" type direct connection, Fig. 1 (b) shows an example of connecting a straight line portion between "S-shaped", and Fig. 1 (c) shows an example of "U-shaped" type. . In this case, the conductor plates arranged above and below are omitted.

In FIG. 1A, a radius of curvature R ₁₈₀ which constitutes a lossless bend having a bend angle of 180 ° is prepared, and this is divided into two to form two bend-shaped dielectric line portions 1 having a bend angle of 90 °.
01 is made, and these two bend-shaped dielectric line parts 101 are formed.
Is re-connected in an "S" shape, and the dielectric straight line portions 102 are connected to both ends of the S shape, respectively.

Further, FIG. 1B shows that a linear dielectric line portion 103 having a constant length l is inserted between the bend-shaped dielectric line portions 101 forming the "S" shape of FIG. 1A. hand,
It is a configuration that is reconnected in an "S" shape. Furthermore, FIG.
(C) shows a configuration in which the "U-shaped" type is reconnected by the same procedure as in FIG. 1 (b).

Next, the operation of the NRD guide curve circuit configured as above will be described. In addition, in FIG.
It is explanatory drawing which shows the reflection characteristic (b), the passage characteristic (c), and its circuit diagram (a) at the time of dividing the bend designed by 80 degree bend into 90 degree units. In the NRD guide, when the line material (relative permittivity), line cross-sectional shape (height and width), design frequency f ₀ , and bend angle θ ₀ are determined, the lossless bend radius is discretized and determined. For this reason, for example, the passage loss and the reflection characteristic are significantly deteriorated like the reflection characteristic and the passage characteristic shown in FIGS. 2B and 2C. This is because the main mode (hereinafter referred to as LS) is present in a portion such as a bend where the line cross section or the continuous structure in the line signal transmission direction is asymmetric with respect to the line signal transmission direction.
This is because unnecessary modes other than M) (hereinafter referred to as LSE) are induced in the NRD guide, and both LSM and LSE modes interfere with each other.

Therefore, taking a 180 ° bend as an example, the lossless bend is L, which is the main mode at the bend inlet (0 ° position) and outlet (180 ° position).
Designed to preserve SM, angle 0 ° and angle 180
LSM and LS depending on location for locations between °
Since the existence ratio of E changes, the 90 ° bend obtained by dividing the 180 ° bend of the NRD guide into two becomes a line with a large bend loss as shown in FIG.

On the other hand, as shown in FIGS. 1 (a) and 1 (b), when the 180 ° bend is divided into two parts and reconnected in an "S" shape, the inlet ( 0 ° position)
Since the signal wave that entered from the 90 ° position continuously advances to the next 90 ° bend for the 90 ° position with the existence ratio and phase information of the LSM and LSE at the 90 ° position, the result is a path equivalent to the 180 ° bend. As a result, the signal wave passes through, and the lossless bend characteristic is equivalent to the 180 ° bend.

Also, in FIG. 1B, a bend having a constant radius of curvature R ₁₈₀ designed with a lossless 180 ° bend is divided into two, and the two divided small bends (bend-shaped dielectric line portion 1).
01), the cross-sectional shape of the dielectric line is the same as the bend part,
For the in-line wavelength λg of the dielectric linear line, the linear dielectric line portion 103 with l = P · λg / 2 (P is an integer) is inserted and reconnected in an “S” shape. This is a state in which a signal wave that has advanced from a 0 ° position to a 90 ° position in a small bend (bend-shaped dielectric line portion 101) with a 90 ° radius of curvature R ₁₈₀ remains mixed with the LSM and LSE modes. Put it in a line that is an integral multiple of half the wavelength of the signal in the straight line section. Therefore, the dielectric line section 10
In the input / output of No. 3, the next 90 ° split small bend (bend-shaped dielectric line portion 101) enters in a state in which both the mode and the phase are almost conserved, so almost the same input / output terminal condition as the 180 ° bend is applied. "S-shape" with almost no loss
The circuit can be configured.

FIG. 3 shows a reflection characteristic (b) and a transmission characteristic when a bend designed by 180 ° bend is divided into 90 ° and a straight line portion is inserted into the divided portion to connect in an “S” shape. It is explanatory drawing which shows (c) and its circuit diagram (a).

FIG. 4 is an explanatory diagram showing the main structure of another NRD guide curve circuit according to the present invention. Figure 4 (a)
Is a bend with a radius of curvature R ₂₇₀ designed with a 270 ° lossless bend, and FIG. 4B shows an example in which the 270 ° bend of FIG. Similar to the example, it forms an almost S-shaped circuit with no loss.

Therefore, generalizing the above embodiment, the radius of curvature Rn designed by the bend angle nθ (n is an integer)
In the bend of θ, the bend is equally divided at an angle n, and all the n small bends (bend-shaped dielectric line portion 101) are used, so that one curved circuit can be formed in one stroke.

Now, the reason why the angle distribution is equal distribution will be described in detail. In the NRD guide, under the condition that the modes of the lines at the input and output points at the constant curvature radius R and the constant angle θ match, R and θ cannot be arbitrarily selected continuously as described above. Therefore, for example, in order to set the input / output mode at 180 ° bend to the main mode LSM ₀₁ , the input / output mode is discretized at a constant radius R ₁₈₀ . For example, R _180-1 (small size of R) R _180-2 (medium size of R) R _180-3 (large size of R). Generally, the conditional expression of lossless bend at 108 ° bend is It is expressed by the following equation. R _180-n = 2 / Δβ · (n ² −x ² ) ^1/2 (Δβ and x are constant functions)

Further, the above R _180-3 (large size of R) will be described as an example. As can be seen from Table 1, [R
_{The 180-4} ] bend corresponds to four [R _45-1 ] bends, but even if the R _180-3 is divided into four equal parts, the LSH mode is not preserved at the input / output.

FIG. 5 is an explanatory diagram showing a change in mode state. As shown in FIG. 5, in order to make the mode state in and out be A (assuming LSM ₀₁ ), when distributed at 45 °, the mode state at 0 ° → 45 ° is A → B 45 ° → 90 ° The mode state in B → C 90 ° → 135 ° is the mode state in C → B 135 ° → 180 °, and the mode state changes continuously. The lossless bend means a bend that is in LSM mode in and out, and theoretically has no loss due to the shape of the bend portion (however, the loss as a line naturally exists).

As described above, since the mode states continuously operate as a whole, in the 180 ° curve, A →
A is realized. A is pure LSM ₀₁ only, B and C are L
Unnecessary miscellaneous modes other than SM ₀₁ are mixed at a fixed ratio,
It shows a certain state.

In the case of designing a curved path at a specific frequency, if one of the mixed mode states in the bend cross section having a large ratio is considered to be the line transmission main mode, P.λg Since the mode state and phase at the input / output section are saved for each length of '/ 2 (P is an integer, λg' is the main mode wavelength in the line), the specific phase state of the main mode of the line at that portion is preserved. Can be connected while holding. That is, as shown in FIG. 6, since 180 ° = 45 ° × 4, R _45-1 × 4 = R ′ ₁₈₀ = R _180-4 , and each 45 ° piece has an input / output of L
Since SM ₀₁ is in the main mode, it can be connected to the in-line wavelength λg of LSM _{01 by} the line represented by P · λg / 2. In this case, because of the ease of design,
The main mode at the bend cross section is the most conceivable example designed to be LSM.

However, if an unsuitable R such as R _180-3 is selected and divided into equal parts, as shown in FIG. 5, A → B →
Since the mode state changes from C to B to A, the B state (LS
In the case where only M ₀₁ is not the main) and the wavelength of the LSM mode is set to λg and a P · λg / 2 straight path is inserted, LSM ₀₁
Even if the phase of the mode is preserved, other modes are not compensated, and the transfer characteristics are significantly lost due to the mutual interference of the modes. In this case, at positions B and C,
Obtain λgB and λgC corresponding to each main mode,
It is necessary to insert a straight line of P · λg / 2 corresponding to them. Therefore, when a straight line is used as the connecting line, it is understood that dividing n by Rnθ is the easiest method.

Similarly, as a method of connecting without using a straight line, there is a method as shown in FIGS. 7 and 8.
That is, the 180 ° bend shown in FIG.
It is divided into °, 80 ° and 60 °, and the arbitrarily divided m pieces are sequentially divided into 10 pieces as shown in FIG.
It is also possible to connect in the order of ° → 30 ° → 80 ° → 60 °.

Therefore, in the above NRD guide curve circuit, the bend angle nθ (n is a positive integer, θ is a unit angle)
Since a bend with a radius of curvature Rnθ designed with a lossless bend is divided into n equal parts at an angle, and all of these n small bends are used, a circuit wiring structure that forms a single curved circuit in a single stroke is used. Compared to the case of designing a constant radius of curvature bend for each bend angle and connecting the circuit by wiring, it is extremely small and the input / output position of the wiring can be specified by designating the bend angle to be used. Because you can
Wiring rules can be fixed or digitized, and complex compound N
Also for the RD guide, the definition of the position of each circuit component in the entire circuit becomes smooth, and the wiring design efficiency is improved.

[0032]

As described above, according to the present invention, N
According to the RD guide curve circuit, a bend with a constant radius of curvature designed with an arbitrary bend angle using an NRD guide is
It is possible to extend the degree of freedom in wiring design by dividing into n pieces and using all of the n divided small bends to form one continuous curved line wiring of one stroke. Due to this improvement in the degree of freedom, it is possible to make the size extremely small and use the space efficiently as compared with the conventional case where the constant radius of curvature bend is designed for each bend angle and the circuit is connected by wiring. Furthermore, by specifying the bend angle to be used, the input / output position of the wiring can be defined, so that the wiring rule can be fixed and digitized, and the complex composite NR
Also for the D guide, the definition of the position of each circuit component in the entire circuit is smooth, and the wiring design efficiency is improved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a main configuration of an NRD guide curve circuit according to the present invention.

FIG. 2 is an explanatory diagram showing a reflection characteristic (b), a passage characteristic (c), and a circuit diagram (a) thereof when a bend designed by a 180 ° bend according to the present invention is divided into 90 °.

FIG. 3 is a sectional view of a bend designed by a 180 ° bend according to the present invention, which is divided into 90 ° and a straight line portion is inserted into the divided portion.
It is explanatory drawing which shows the reflection characteristic (b), the passage characteristic (c), and its circuit diagram (a) at the time of a "shaped" connection.

FIG. 4 is an explanatory diagram showing another main configuration of the NRD guide curve circuit according to the present invention.

FIG. 5 is an explanatory diagram showing a change in mode state according to the present invention.

FIG. 6 shows a 180 ° bend according to the present invention divided into four (45
FIG. 4 is an explanatory view showing an example in which a straight line is re-connected after being rotated.

FIG. 7 is an explanatory view showing a 180 ° bend according to the present invention.

FIG. 8 is an explanatory view showing an example in which the 180 ° bend shown in FIG. 7 is arbitrarily divided and reconnected.

FIG. 9 is an explanatory diagram showing the principle of the NRD guide according to the present invention.

FIG. 10 is an explanatory diagram showing a main configuration of a conventional NRD guide curve circuit.

FIG. 11 is an explanatory diagram showing a main configuration of a conventional NRD guide curve circuit.

[Explanation of symbols]

 101 Bend-shaped Dielectric Line Section (Divided Small Bend Section) 103 Linear Dielectric Line Section 901 Upper Conductor Plate 902 Lower Conductor Plate 903 Dielectric Line

Claims (2)

[Claims] 1. An NRD guide is formed by arranging a dielectric line material for signal transmission between the upper and lower conductor plates, and an interval between the upper and lower conductor plates is set at a portion between the upper and lower conductor plates outside the dielectric line material. In the NRD guide curve circuit set to a half wavelength or less of the operating frequency, the NRD guide has a bending angle nθ.
(N is a positive integer, θ is an angle) The radius of curvature of the dielectric line material that constitutes the bend is Rnθ, and one bend of curvature of Rnθ is divided into n divided small bend portions of the angle θ.
An NRD guide curve circuit in which divided small bend portions divided into individual pieces are continuously connected arbitrarily. 2. The NRD guide has a length P · λg / 2 (where λg is an in-line wavelength) between the divided small bend portions and the divided small bend portions and having the same line sectional shape as the divided small bend portions. , P are positive integers) to form a linear portion by inserting a linear dielectric line member.
D guide curve circuit.