JPH0211168B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electromagnetic delay line that combines an inductance element and a capacitor, and particularly to an improvement of an electromagnetic delay line that is suitable for use at ultra-high frequencies and has a relatively large delay time. Regarding.

[Prior art and its problems]

This type of electromagnetic delay line has the configuration shown in FIGS. 1 and 2.

That is, an inductance element 3 is formed by space-winding a conductive wire 2 having a wire diameter D around a flat rod-shaped bobbin 1 at a predetermined pitch P in the shape of a single layer solenoid, and a ground electrode 5 is formed on one main surface of an elongated dielectric plate 4. A capacitor C is formed by providing a capacitor electrode 6 on the opposite main surface at the same pitch as the conductor wire 2, and connecting the capacitor electrode 6 of the capacitor C with the conductor wire 2 of the inductance element 3 to form a concentrated structure having multiple sections. It is configured as a constant type.

In both figures, the symbol W is the distance in the long side direction of the cross section of the bobbin 1, the symbol B is the distance in the short side direction of the cross section of the bobbin 1, and the symbol T is the distance of the current in the short side direction of the cross section of the bobbin 1. It shows the distance between the centers of conducting wires 2 with different directions.

The electromagnetic delay line configured in this way has a distance T,
There is a relationship between B and D as follows: T=B+D (1), and by selecting an appropriate ratio of pitch P and distance T (for example, about 0.2<P/T<1.9), good delay characteristics can be obtained. For example, it is possible to obtain ultra-high-speed rise characteristics. This relationship has already been disclosed by the present applicant in Japanese Patent Application No. 57-27135.

In such an electromagnetic delay line, in order to obtain ultra-high speed and a relatively long delay time, the number of turns (number of sections) must be increased.

For example, in an electromagnetic delay line with about 100 sections, attenuation in the ultra-high frequency range due to loss in conductor 2 cannot be ignored, and to prevent this, conductor 2
It is necessary to increase the cross-sectional area of

However, as is clear from the above equation (1), when the wire diameter D is increased to increase the cross-sectional area of the conductor 2, the distance T also increases, and the relationship between the pitch P and the distance T improves the delay characteristics. This deviates from the above-mentioned conditions.

However, if the distance B of bobbin 1 is made smaller, then the distance D
However, in the case of an electromagnetic delay line in which the conductor 2 is wound around the bobbin 1, the distance B of the bobbin 1 cannot be made zero, and (1) From the formula, there is a relationship of B=T-D>0 (2), and in the end, T>D (3) That is, the distance T of the conductor 2 was larger than the wire diameter D.

Therefore, when configuring an electromagnetic delay line with a relatively large delay time, in other words, a large number of sections,
There is a limit to realizing an ultra-compact and ultra-high-speed electromagnetic delay line by suppressing the loss of the conducting wire 2, selecting both the pitch P and the distance T in the above-mentioned relationship, and reducing the loss.

[Purpose of the invention]

The present invention was made under such circumstances, and the pitch P and the distance T between the conductors can be reduced while keeping the width of the conductor in the inductance element large.
The purpose of the present invention is to provide an electromagnetic delay line that can be reduced in size, has low loss, is ultra-compact, ultra-high speed, and has a simple structure.

[Structure and effects of the invention]

To achieve this object, the present invention comprises a flat inductance element in which a conductor is space-wound in the form of a single-layer solenoid, and a capacitor connected between each predetermined turn of this inductance element and ground. In the electromagnetic delay line, the width of the conductor is D, the distance between the centers of the conductors facing each other in the short side direction of the inductance element is T, and the inductance element is set in a relationship such that D≧T. be.

According to the configuration of the present invention, it is possible to reduce both the pitch P and the distance T while keeping the width of the conductor in the inductance element large, suppressing loss in the conductor and increasing the desired coupling coefficient of the inductance element. can be obtained.

Therefore, signal attenuation in the ultra-high frequency range is small, good delay characteristics, such as ultra-fast rise characteristics, can be obtained, and it is extremely easy to achieve ultra-miniaturization.

This is particularly useful for electromagnetic delay lines with a large number of sections, since conductor loss is extremely reduced.

[Embodiments of the invention]

The details of the present invention will be explained below.

FIGS. 3 and 4 are a plan view and a sectional view showing an embodiment of the present invention.

In both figures, both wide main surfaces (top and bottom in the figure) of a flat and elongated bobbin 7 made of an insulator are shown.
A plurality of winding grooves 8 and 9 are formed at a predetermined pitch P in the width direction. The winding grooves 8 and 9 formed on the upper and lower surfaces of the bobbin 7 are formed to have depths that slightly overlap each other and to be offset by half a pitch between the upper and lower surfaces.

In the winding grooves 8 and 9 of the bobbin 7, a conducting wire 10 having a width approximately the same as the width of the winding grooves 8 and 9, that is, a wire diameter D, is space-wound in a single-layer solenoid shape, and an inductance element 11 is formed. . Since the winding grooves 8 and 9 are formed at a depth that slightly overlaps each other, the wound inductance element 11 has a distance T between the centers of the conductive wire 10 in the short side direction of the bobbin 7, which is the diameter of the conductive wire 10. smaller than D, T
<D.

On one side surface of the inductance element 11 (one side surface in the short side direction of the bobbin 7), as shown in FIG. A capacitor element C having capacitive electrodes 14 formed at the same pitch is connected to the conducting wire 10 by soldering, thereby forming a lumped constant electromagnetic delay line having a plurality of sections.

Note that the symbol P in FIG. 3 is the distance between the centers of adjacent conductors 10 on each of both main surfaces of the bobbin 7,
This corresponds to the pitch P of the electromagnetic delay line in FIG. 1 mentioned above.

In the electromagnetic delay line configured in this way,
The inductance element 11 converts the distance T between the centers of the conductive wire 10 in the short side direction of the bobbin 7 to the wire diameter D of the conductive wire 10.
Since it is smaller than , that is, T<D,
Even if the wire diameter D of the conducting wire 10 is large, the distance T between the centers of the conducting wire 10 becomes small.

Therefore, even if the number of sections is large, it is possible to suppress the loss of the conducting wire 10, and by selecting the pitch P and the distance T to be small and under favorable conditions, it is also possible to secure a desirable coupling coefficient in the inductance element 9.

Therefore, in the ultra-high frequency range, attenuation can be improved, good delay characteristics, such as ultra-high-speed rise characteristics, can be obtained, and the size can be reduced.

Moreover, the distance T is not obtained through the bobbin 1 as shown in FIG. 1, but can be arbitrarily selected, especially minutely, by appropriately selecting the depths of the winding grooves 8 and 9. The structure is simple.

5 to 7 show other embodiments of the electromagnetic delay line of the present invention.

In this embodiment, conductor pieces 15 to 17 made of copper foil or copper plate and having a predetermined length H-I, I-J, J-K, . are integrally connected to form a strip conductor 18, and as shown in FIG. 6, a flat conductor is formed by bending the boundaries H, I, J, K, . forming an inductance element 11;
A capacitive electrode 14 of a capacitor C as shown in FIG. 4 is connected to the bent portion of the band-shaped conductor 18, thereby constructing a lumped constant electromagnetic delay line having a plurality of sections.

In such an electromagnetic delay line, the center of each conductor piece 15, 17 between H-I and J-K is located on the virtual line Q-Q shown in FIG. 16 is located on the virtual line RR. Therefore,
The distance corresponding to the distance T of the electromagnetic delay line mentioned above is
When the band-shaped conductor 18 is bent, the distance between the centers of opposing conductors, that is, the virtual lines Q-Q and R-
This is the distance between R.

In this case as well, the distance T is
It is possible to make the conductor pieces 15 to 17 extremely small by simply shifting the center of the conductor pieces 16.
The width D of can be made wider than the distance T,
Loss can be reduced.

Furthermore, as shown in FIG. 6, since the conductor 18 is thin and the pitch P can be made small, the pitch P and T
Both can be selected to be extremely small, and therefore,
Good delay characteristics can be obtained while achieving high density and ultra-miniaturization.

Further, in the above-described embodiment, the relationship between the width D and the distance T of the conductor wire 10 and the conductor piece 18 of the inductance element 11 was configured as D>T, but in the present invention, it is preferable to select the relationship such that at least D≧T. The object of the invention can be achieved.

As explained above, in the electromagnetic delay line of the present invention, the width of the conductor constituting the flat inductance element is D.
Since the distance between the centers of the conductors facing each other in the short side direction is T, and the inductance element is set in the relationship D≧T, it is possible to reduce both P and T while increasing the cross-sectional area of the conductor. The conductor loss is small, it is possible to achieve ultra-miniaturization and ultra-high speed, and the structure is simple.

[Brief explanation of drawings]

1 and 2 are a front view and a side view showing an electromagnetic delay line as a reference for the present invention, and FIGS. 3 and 4 are a plan view and a side view showing an embodiment of the electromagnetic delay line of the present invention. , FIG. 5 to FIG. 7 are a developed view, a front view, and a schematic side view of essential parts showing other embodiments of the electromagnetic delay line of the present invention. 1, 7... Bobbin, 2, 10, 18... Conductor (conductor wire), 3, 11... Inductance element, 4,
12... Insulating substrate (dielectric plate), 5, 13... Earth electrode, 6, 14... Capacitive electrode, 15-17...
...Conductor piece, 18...Strip conductor, C...Capacitor.

Claims (1)

[Claims] 1. In an electromagnetic delay line comprising a flat inductance element in which a conductor is space-wound in the shape of a single-layer solenoid, and a capacitor connected between each predetermined turn of this inductance element and the ground. , wherein the width of the conductor is D, the distance between the centers of the conductors facing each other in the short side direction of the inductance element is T, and the inductance element is set in a relationship such that D≧T. delay line. 2. The electromagnetic delay line according to claim 1, wherein the inductance element is formed by winding a conductor in winding grooves formed on opposing principal surfaces of a flat bobbin at predetermined pitches and at depths that overlap each other. 3. A patent claim in which the inductance element is formed by integrally and continuously forming a plurality of conductor pieces of a predetermined length with the centers of the conductor pieces alternately shifted, and the boundaries between adjacent conductor pieces are sequentially bent in a zigzag shape. The electromagnetic delay line according to item 1.