JPS6027214A - Electromagnetic delay line - Google Patents

Abstract

PURPOSE:To reduce an electromagnetic delay line at its size and to speed up the transmission by setting up a specific relation on a distance between the width of a conductor constituting a flat inductance element of the electromagnetic delay line and the center of a conductor opposed to its short side. CONSTITUTION:Plural winding grooves 8, 9 are formed on both the wide main sides of a flat and thin bobbin 7 consisting of an insulator with a prescribed pitch P in its width direction. The winding grooves 8, 9 formed on the upper and lower sides of the bobbin 7 are formed so as to have the depth allowing the winding grooves 8, 9 to overlap slightly each other and to be shifted by a half pitch respectively between the upper and lower sides. A conductor 10 having the approximately same width, i.e. a linear shape D, as the width of the winding grooves 8, 9 is wound around the winding grooves of the bobbin 7 with spaces like a single layer solenoid to form an inductance element 11. Since the winding grooves 8, 9 are formed with the depth allowing the winding grooves 8, 9 to overlap slightly each other, the wound element 11 is set up to D>=T so that the distance T between the centers of the conductors 10 in the short side direction of the bobbin 7 is smaller than the wire diameter D of the conductor 10.

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 relates to an improvement in an electromagnetic delay line that is suitable for use at ultra-high frequencies and has a relatively large delay time. .

[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 diameter 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. At the same time, a capacitor C is formed by providing a capacitor electrode 6 on the opposite main surface with the same pinch as the conductor wire 2, and the capacitor C is formed. The 1-C capacitor electrode 6 and the conductive wire 2 of the inductance element 3 are connected to form a lumped constant type having a plurality of sections.

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 in the short side direction of the cross section of the bobbin 1. It shows the distance between the centers of conductive wires 2 with different current directions.

The electromagnetic delay line configured in this way has the following relationship between the distances T, B, and D: T = B, + D... (1), and the ratio between the pitch P and the distance T is set appropriately (for example, 0.2 <
P/T<about 1.9), it is possible to obtain good delay characteristics, for example, 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 large delay time, the number of turns (number of sections) must be increased.

For example, in an electromagnetic delay line having about 100 sections, attenuation in the ultra-high frequency range due to loss in the conducting wire 2 cannot be ignored, and in order to prevent this, it is necessary to increase the cross-sectional area of the conducting wire 2.

However, as is clear from equation (1) above, when the wire diameter 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 the bobbin 1 is small so that the distance T does not increase even if the distance is increased, if the electromagnetic delay line has a configuration in which the conductor 2 is wound around the bobbin 1, the distance B of the bobbin 1 cannot be made zero, and from formula -(1), there is a relationship of B=T-D>0... (2), and in the end, T>D...... (3) That is, the distance T of the conducting wire 2 was larger than the wire diameter.

Therefore, when configuring an electromagnetic delay line with a relatively large delay time, in other words, a large number of sections, it is necessary to suppress the loss of the conductor 2, and to select both the pitch P and the distance T in the above-mentioned relationship. There are limits to the miniaturization of ultra-compact and ultra-high speed electromagnetic delay lines.

[Purpose of the invention]

The present invention was made under these circumstances, and it is possible to reduce the pitch P and the distance T between the conductors while keeping the width of the conductor in the inductance element large, thereby reducing loss. The purpose is to provide an electromagnetic delay line that is ultra-compact, ultra-high speed, and has a simple structure.

[Structure and effects of the invention]

In order to achieve this object, the present invention includes 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, and the distance between the centers of the conductors facing each other in the short side direction of the inductance element is T.
The inductance element is set to satisfy the relationship D≧T.

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, thereby suppressing loss in the conductor and improving the desirable 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 present invention will be explained in detail below.

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

In both figures, a plurality of winding grooves 8.9 are formed at a predetermined pitch P in the width direction on both wide main surfaces (upper and lower surfaces in the figures) of a flat and elongated bobbin 7 made of an insulator. .

The winding grooves 8.9 formed on the upper and lower surfaces of the bobbin 7 are
They are formed to have depths that slightly overlap each other, and to be offset by a half pitch between the upper and lower surfaces.

In the 'J$8.9 of the bobbin 7, a conductive wire 10 having a width approximately the same as the width of the winding groove 8.90, that is, a wire diameter, 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 depths that are slightly parallel to 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. It is smaller than the wire diameter, and T<D.

As shown in FIG.
A capacitor element C is formed by forming a ground electrode 13 on the living surface of the conductor 2 and forming a capacitor electrode 14 on the opposite main surface with the same pitch and notch as the conductor 10, and connects the capacitor electrode 14 to the conductor 10 by soldering. A lumped constant electromagnetic delay line having multiple sections is constructed.

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 pobbin 7, and corresponds to the bi-notch P of the electromagnetic delay line in FIG. 1 described above.

In the electromagnetic delay line configured in this way, the inductance element 11 makes the distance T between the centers of the conducting wire 10 in the short side direction of the pobbin 7 smaller than the wire diameter of the conducting wire 10, that is, T<D. Even if the wire diameter 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, loss in the conducting wire 10 can be suppressed, and a desirable coupling coefficient in the inductance element 9 can also be ensured by selecting the pitch P and the distance 1i3IiT to be small and under favorable conditions.

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

Moreover, the distance 1@T is not obtained through the bobbin 1 as shown in Fig. 1, but can be arbitrarily selected, especially minutely, by appropriately selecting the depth of the winding groove 8.9. 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, which are made of copper foil or copper plate and have predetermined lengths H-I, I-J, J, -, etc., are arranged alternately at their centers. The band-shaped conductor 18 is formed by integrally connecting the conductor pieces 15 to 17 at the boundaries (H, I, J, etc.) as shown in FIG.
) is bent into a jagged shape to form a flat inductance element 11, and the bent part of the band-shaped conductor 18 is connected to the capacitive electrode 14 of a capacitor C as shown in FIG. A type of electromagnetic delay line is constructed.

In such an electromagnetic delay line, the center of each conductor piece 15.17 between H-I and J- is located on the imaginary line Q-Q shown in FIG. 16 is located on the virtual line RR. Therefore, the distance T of the electromagnetic delay line mentioned above
The distance corresponding to
and R-8.

In this case as well, the distance T can be made extremely small by simply shifting the centers of the conductor pieces 15, 17 and 16, and the width of the conductor pieces 15 to 17 is made wider than the distance T. It is possible to reduce losses.

Furthermore, as shown in FIG.
Since the pitches P and T can both be made extremely small, it is possible to obtain good delay characteristics while achieving high density and ultra-miniaturization.

Further, in the above-described embodiment, the relationship between the width of the conductive wire 10 and the conductor piece 18 of the inductance element 11 and the distance T 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, the distance between the centers of the conductors facing each other in the short side direction is T, and the inductance element is D≧ Since the relationship is set as T, it is possible to reduce both P and T while increasing the cross-sectional area of the conductor, and the loss of the conductor is small, making it possible to achieve ultra-miniaturization and ultra-high speed. The structure is also 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 I8... Band-shaped conductor C... Capacitor patent applicant Elmec Co., Ltd.

Claims (3)

[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 to the ground at each predetermined turn of the inductance element, An electromagnetic delay line characterized in that a width is D, a distance between the centers of the conductors facing each other in the short side direction of the inductance element is T, and the inductance elements are set in a relationship such that D≧T. (2) The inductance element is formed by winding a conductor in winding grooves formed on the opposing main surfaces of a flat bobbin at a depth that overlaps each other with a predetermined pinch.
Electromagnetic delay line as described in section. (3) 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 by sequentially bending the boundaries of adjacent conductor pieces in a zigzag shape. An electromagnetic delay line according to claim 1.