JPH0246099Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The invention relates to a distributed constant type electromagnetic delay line, and is particularly suitable for high-frequency signals in the GHz band or ultra-high-speed signals with fall times of 100 ps or less. Concerning improvements in electromagnetic delay lines.

[Prior art and its problems]

As for this type of electromagnetic delay line, the present inventor has already proposed an ultra-small, high-density, and low-loss electromagnetic delay line in a patent application.
No. 59-96145.

That is, it is an electromagnetic delay line in which a conducting path is formed on a ground plate via a dielectric layer, and a conductor-removed portion is formed at least in a portion of the grounding plate that faces and overlaps with the conducting path.

Specifically, as shown in FIGS. 4 and 5, a plurality of elongated rectangular conductor removal portions 2 having a width a and a length b' are formed in parallel on a rectangular grounding plate 1 at a pitch d. It has a structure in which a dielectric layer 3 is formed on the outer periphery of the grounding plate 1, and a conductive path 4 having a width ω and a thickness t is space-wound around the outer periphery of the dielectric layer 3 in the shape of a single-layer solenoid with a pitch P. There is.

Furthermore, as another specific example, as shown in FIG. 6, a plurality of circular conductor removal parts 5 are arranged on the ground plate 1 in FIG. There is something that has been formed.

In such an electromagnetic delay line, even if the thickness h of the dielectric layer 3 is reduced without reducing the width ω of the conducting path 4, it is possible not only to obtain a desired characteristic impedance but also to increase the propagation delay time. This makes it possible to achieve ultra-miniaturization and high density.

However, upon further study of the electromagnetic delay line configured in this way, it was found that although it has structural advantages, there are still areas that need improvement from the viewpoint of improving productivity and maintaining characteristics. .

That is, when manufacturing an electromagnetic delay line having the configuration shown in FIGS. 4 and 5, for convenience, an elongated conductor removal portion 2 is formed in advance on the ground plate 1 by etching or the like.
Thereafter, a method is adopted in which the ground plate 1 is bonded to the dielectric layer 3 by thermocompression bonding or the like.

However, as can be seen from FIG. 4, the conductor removed portion 2 is formed to have a width a and a length b', extending completely in the longitudinal direction of the electromagnetic delay line. The dimension of the width a of 2 becomes larger or smaller than the intended value and easily deforms, and the thermocompression bonding operation must be done carefully in order to stabilize the characteristics, which does not improve productivity.

In this regard, in the case of the electromagnetic delay line having the configuration shown in FIG.
are arranged alternately in two directions perpendicular to the axis of the electromagnetic delay line. Conductor removal part 5 on earth plate 1
There are parts where there are many conductor connecting parts 6 and parts where there are many conductor connecting parts 6.

Therefore, the characteristic impedance of the conducting line 4 becomes high in the part where there are many conductor removed parts 5, and the characteristic impedance of the conducting line 4 becomes low in the part where there are many conductor connecting parts 6, resulting in variations in the characteristic impedance of the conducting line 4. It may be difficult to stabilize the characteristics.

[Purpose of invention]

The present invention was developed under these circumstances, and aims to provide an ultra-high-speed electromagnetic delay line that has good productivity, maintains its characteristics, is ultra-small, has high density, and has low loss.

[Structure and effect of the idea]

In order to achieve this object, the present invention provides an electromagnetic delay line in which a conductor line is formed on a ground plate through a dielectric layer, in which a conductor removal part is connected to the ground plate in vertical and horizontal directions via a conductor connection part. A plurality of conductor removal portions are formed, and the conductor removal portions that are continuous in the vertical or horizontal direction are arranged diagonally with respect to the vertical or horizontal direction.

According to the configuration of the present invention, ultra-miniaturization,
It is possible to improve productivity while maintaining high performance such as high density and reduced loss.

[Example of idea]

The details of the present invention will be explained below.

1 and 2 are a front view and a side view showing an embodiment of the electromagnetic delay line of the present invention.

In both figures, a dielectric layer 8 is formed on the outer periphery of a rectangular thin earth plate 7, and both longitudinal ends of the earth plate 7 protrude from the dielectric layer 8.

On the outer periphery of the dielectric layer 8, there is a conductive line 9 having a width ω and a thickness t.
is space-wound in the shape of a single-layer solenoid at pitch P, forming a distributed constant type electromagnetic delay line.

In FIG. 2, the symbol h is the thickness of the dielectric layer 8 on one side of the ground plate 7, and the symbol T is the distance between the centers of the conductive lines 9 facing each other with the ground plate 7 in between.

The ground plate 7 is provided with rectangular conductor removal parts 10 having a width a and a length b along its longitudinal direction (left-right direction in FIG. A plurality of conductor removed portions 10 are formed in series with each other, and rows of these conductor removal portions 10 are formed in the width direction (vertical direction in FIG. 1) of the multi-stage earth plate 7.

Moreover, the conductor removal portions 10 in each row are connected to the ground plate 7.
They are formed to be sequentially shifted diagonally with respect to the width direction (vertical direction) of the earth plate 7, and are arranged diagonally at an angle θ with respect to the width direction of the ground plate 7.

The pitch P of the conductive line 9 and the center distance T of the conductive line 9 facing each other with the ground plate 7 in between are within a range that allows a practical pulse response waveform to be obtained, and 0<T/P<
It is preferable to select within the range of 1.

In the electromagnetic delay line configured in this way, the conductor removed portion 10 is formed short and the ground plate 7 is formed as shown in FIG.
Because they are not formed completely in the longitudinal direction and are arranged diagonally and slightly shifted, even when the grounding plate 7 on which the conductor removed portion 10 is formed is thermocompression bonded to the dielectric layer 8, the elongated conductor removed portion 10 is less likely to deform, and the ground plate 7 is easier to handle.
Manufacturing efficiency improves.

Moreover, as described above, since the conductor removal portion 10 is partially formed in the portion of the ground plate 7 that overlaps with the conductor line 9, the inductance of the conductor line 9 increases,
It is necessary to increase the capacitance by that increase in order to maintain the same characteristic impedance, but since the conductor area that forms the capacitance is decreasing, the thickness h of the dielectric layer 8 must be made sufficiently thin. By doing so, the necessary capacitance can be obtained.

That is, since the thickness h of the dielectric layer 8 can be made sufficiently thin, the pitch P and the interval T of the conductive lines 9 can be made small, so that ultra-miniaturization and high density can be achieved.

Furthermore, since the propagation delay time per unit length increases while keeping the width ω of the conducting path 9 the same,
Since the loss per unit delay time is conversely reduced while achieving ultra-miniaturization, even higher performance can be achieved.

The shape of the conductor removed portion formed in the ground electrode 7 is as follows:
The shape is not limited to the rectangle shown in FIG. 1 described above. For example, as shown in FIG.
A plurality of conductor connecting parts 13 are formed in the longitudinal direction and the width direction of the ground plate 7, and the circular conductor removal parts 12 connected in the width direction are arranged diagonally at an angle θ with respect to the width direction. good. Although not shown in the drawings, the configurations of the dielectric layer 8 and the conductive line 9 are the same.

In the electromagnetic delay line configured in this way, since the conductor removal section 12 and the conductor connection section 13 are arranged in a distributed manner on the ground plate 7 for the conductor line 9, variations in the characteristic impedance of the conductor line 9 are also dispersed, and the characteristic The characteristics are stabilized by suppressing the influence on

Furthermore, the shape of the conductor removed portion may be triangular, hexagonal, etc. other than these, and the point is that the conductor removed portion is formed in two orthogonal directions of the top and bottom or left and right directions of the ground plate 7, and Alternatively, the object of the present invention can be achieved by arranging the conductor removal portions extending in the left-right direction obliquely with respect to the upper and lower directions or the left-right direction.

In addition, in the case of the electromagnetic delay line of the present invention, when the relationship between the pitch P and the interval T of the conductor line 9 is T/P=0, that is, the microstrip conductor is formed into a rectangular or triangular shape in a plane. It is possible to form it by bending it, and it is also possible to form it in a spiral shape or simply in a straight line.

As explained above, the electromagnetic delay line of the present invention can improve manufacturing efficiency while maintaining high performance such as miniaturization, high density, and low loss.

[Brief explanation of drawings]

1 and 2 are front and side views showing one embodiment of the electromagnetic delay line according to the present invention, FIG. 3 is a partial front view showing another example of the ground plate shown in FIG. 1, and FIG. 5 and 5 are front and side views showing an electromagnetic delay line as a reference for the electromagnetic delay line of the present invention, and FIG. 6 is a partial front view showing another example of the ground plate in the electromagnetic delay line of FIG. 4. It is. 1, 7...Earth plate, 2, 5, 10, 12...
Conductor removed portion, 3, 8...dielectric layer, 4, 9...conductor path, 6, 11, 13...conductor connection portion.

Claims (1)

[Scope of utility model registration request] In an electromagnetic delay line in which a conducting path is formed on a ground plate via a dielectric layer, a plurality of conductor removal parts are formed on the ground plate in the vertical and horizontal directions via conductor connecting parts, and the conductor removal parts are formed in the vertical and horizontal directions. An electromagnetic delay line characterized in that conductor removal portions connected to are arranged diagonally with respect to the vertical or horizontal direction.