JPS6211312A - Electromagnetic delay line - Google Patents

Abstract

PURPOSE:To increase the delay time and to attain a chip delay line by connecting a capacitance compensating electrode to a unit conductor line forming an inductance elenment so as to narrower the width of the line thereby increasing the inductive component and facilitating the static capacitance compensation of the line. CONSTITUTION:An electrode 8 or 9 is connected to the midpoint of the unit conductor lines 6, 7, an interval T is given between center lines of the lines 6, 7 to deviate the lines 6, 7 by the interval T. The conductor strip like above is folded alternately to form an inductance element 10 where the lines 6, 7 and the electrodes 8, 9 are opposed face to face via an air gap. The electrodes 8, 9 act like capacitance compensation with a ground electrode 12 and when the width of the lines 6, 7 is decreased, the inductive component per unit length of each line is increased and the capacitance of the electrodes 8, 9 is added and the delay time per unit length is increased. Further, a chip line is facilitated by lamination of the lines 6, 7, a dielectric layer 11 and the grounding electrode 12.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a distributed constant type electromagnetic delay line that handles ultra-high-speed signals with a rise time of Ins or less, and is particularly suitable for chip-type configurations, and is suitable for increasing delay time. This invention relates to electromagnetic delay lines that are easy to use and have good characteristics.

[Conventional technology]

The present inventor has already filed a patent application filed on March 15, 1985 as a distributed constant type electromagnetic delay line suitable for a chip type structure.
No. 0-52,670 proposed a new configuration.

In other words, a plurality of unit conductive lines are arranged in a stacked manner at intervals, and every other unit conductive line among these unit conductive lines is separated by a distance T from the center line of the other unit conductive lines. Place the center line off-center.

These unit conducting lines are sequentially connected in series at their ends in a direction perpendicular to the interval T to form a substantial single-layer solenoid-like inductance element, and a dielectric layer is interposed between adjacent unit conducting lines. Ground electrodes are placed facing each other.

Such an electromagnetic delay line can be used to handle ultra-high-speed signals, and if the ratio T/P of the pitch P of the spacer and inductance element is selected in the range of 0<T/P<1, good delay characteristics can be obtained. It will be done.

[Problem that the invention seeks to solve]

However, although it is easy to reduce the size of such an electromagnetic delay line by reducing the interval T and pitch P, it is difficult to reduce the width of the unit conductor line too much.
The inductance per unit length of the unit conductive line tends to be small, making it difficult to increase the delay time per unit volume.

Also, even if the width of the unit conductor line is reduced.

While the inductance increases, the capacitance per unit length obtained between the unit conductor line and the ground electrode decreases, so it is difficult to arbitrarily select the inductance and capacitance of the unit conductor line, and the design There are points that need to be further improved to increase the degree of freedom.

The width of the unit conducting line was selected mainly to set the characteristic impedance ZO of the inductance element to a predetermined value.

The present invention was made under these circumstances.

This is an electromagnetic delay line suitable for a chip type that uses an inductance element formed by forming a unit conductor line substantially in the shape of a single-layer solenoid, in order to obtain a large delay time and to improve the degree of freedom in design. .

[Means for solving problems]

In order to solve these problems, the electromagnetic delay line of the present invention has a plurality of unit conductive lines stacked at intervals, and among these unit conductive lines.

Every other unit conducting line is arranged with its center line shifted by a distance T from the center line of the other unit conducting line.

These unit conductor lines are sequentially connected in series at their ends in the direction perpendicular to the interval T to form a substantial single-layer solenoid-like inductance element, and grounded via a dielectric layer between adjacent unit conductor lines. The electrodes are arranged to face each other, and a capacitance compensation electrode connected to the unit conductive line is arranged to face the ground electrode.

[For production]

By such means, the electromagnetic delay line of the present invention can be obtained.

When the width of unit conductor lines connected in series in a stacked manner is narrowed, the inductance increases.

By narrowing the width of the unit conductive line, the capacitance compensating electrode formed in connection with the unit conductive line can easily compensate for insufficient capacitance or a larger capacity.

〔Example〕

Embodiments of the electromagnetic delay line of the present invention will be described below.

FIG. 1 is a developed view of an inductance element constituting an embodiment of the electromagnetic delay line of the present invention, and is shown for convenience.

This inductance element will be explained first.

In the figure, a thin and elongated conductive band l made of tung oil, etc.
The first bent portions 2a are perpendicular to this longitudinal direction and are paired at an interval of length P/2 (P is the winding pitch of the inductance element 10, which will be described later).

2b (solid line), and second bent portions 3a and 3b (broken line), which are also paired at an interval of P/2, are formed alternately at intervals of length.

Each of the first bent parts 2a, 2b and each of the second bent parts 3a, 3b are bent in the same direction, but the adjacent first bent parts 2a, 2b The second bending portions 3a and 3b are bent in opposite directions.

From one end edge 1a (lower side in the figure) along the longitudinal direction of the conductive band 1, a portion extending between one side 3a of the second bent part and one side 2b of the first bent part An L-shaped notch 4 is formed.

That is, this cut 4 is located at a position close to the second bent portion 3a and extends from one end edge 1a to one end edge 1b (
It is cut in an L-shape to a length close to the first bent part 2b (upper side in the figure), and bent at a right angle to the first bent part 2b to a length that does not extend to the vicinity of the first bent part 2b.

A similar L-shaped cut 5 is made from the two end edges 1b in the length between the other 2a of the first bent part and the other 3b of the second bent part. It is formed from the other side 2a toward the other side 3b of the second bent part.

As a whole, the conductive band 1 has a notch 4.5 at both ends 1a.
, lb are formed in a staggered manner.

Here, in the conductive band 1, a length L portion divided by the notch 4 and one end edge 1b is defined as the first unit conducting line 6, and a length L portion divided by the notch 5 and one end edge 1a is defined as the first unit conducting line 6. 2 unit conductive lines 7, the 1st and 2nd unit conductive lines 6 and 7 are the 1st and 2nd unit conductive lines 7, respectively. The second bent portions 2a and 2b and 3a and 3b are integrally connected to each other alternately via portions having a length P/2.

On the other hand, since the L-shaped cuts 4 and 5 are formed in the conductive band 1, the first. Near the length P/2 portion sandwiched between the second bent portions 2a and 2b and 3a and 3b, the electrode 8 is connected to the first unit conductive line 6 and the length P/2 portion, and the second unit The electrode 9 is extended from the conductive path 7 and the length P/2 portion. In other words, 1st. An electrode 8 or 9 is connected to the middle of the second unit conducting line 6.7.

A distance T is created between the center line Q of the first unit conductive line 6 and the center line R of the second unit conductive line 7. That is,
1st. The second unit conductive lines 6.7 are arranged with a distance T shifted from each other.

Such a conductive band l is the first conductive band l. Second bent portions 2a, 2b
, 3a and 3b alternately, and as shown in FIG. An inductance element 10 in which a second unit conducting line 6°7 and electrodes 8 and 9 face each other through a gap.
is formed.

Note that the symbol P in FIG. 2 is the winding pinch of the bent inductance element 10, and the symbol W is the width of the inductance element 10.

This inductance element 10 includes the first. Since the center lines Q and R of the second unit conductor line 6.7 are placed apart by the distance T, if the direction of the current is determined in the direction of the arrow in FIG. Generally speaking, the structure is equivalent to an inductance element in which a conductor A is space-wound in a single-layer solenoid shape with a pitch P2 interval T. However, the pitch P and the interval T between the two windings are the distances between the centers of the conductors.

4 to 6 are a plan view, a side view, and a front view (partially shown) showing an embodiment of the electromagnetic delay line of the present invention using the above-mentioned inductance element 10.

In the figure, as shown in FIG. 2, the first two are adjacent and face to face. Second unit conducting lines 6, 7 and electrodes 8, 9
A dielectric layer 11 made of, for example, fluororesin is arranged between them, and a ground electrode 1 is placed in the center of each dielectric layer 11.
2 is the first. They are arranged parallel to and face to face with the second unit conducting lines 6 and 7 and the electrodes 8 and 9.

Further, the ground electrodes 12 are commonly connected by a common ground electrode 13 at the end surface of the inductance element 10, that is, at the second unit conductive line 711 (bottom side in FIG. 6), thereby forming a distributed constant type electromagnetic delay line. ing.

In an electromagnetic delay line configured in this way.

Each electrode 8.9 formed by a plurality of notches 4.5 from the conductive band 1 forms a capacitance compensation electrode, which will be described later, with the ground electrode 12, and also forms a capacitance compensation electrode to be described later. Second unit conducting lines 6, 7
．． Since the dielectric layer 11 and the ground electrode 12 are laminated,
The structure is suitable for chipping.

When the width of each unit conductor line 6.7 is made smaller, the inductance per unit length of each unit conductor line 6.7 increases, while each unit conductor line 6.7 has an electrode extending from now on. Because there is 8.9.

The capacitance due to the electrodes 8 and 9 is added to compensate for the capacitance, and the delay time per unit length of each unit conducting line 6 and 7 increases.

That is, the capacitance of each unit conducting line 6, 7 itself becomes smaller when the width thereof is reduced, but the electrode 8.9 functions as a capacitance compensating electrode and is added thereto.

Therefore, it is easy to increase both the inductance and the capacitance of each unit conductive line 6, 7, and the delay time can be increased, and the characteristic impedance Zo of each unit conductive line 6.7 is Since it is determined by =7τ70,000 (where the sign and C are the inductance and capacitance per unit length of the unit conducting line 6.7), it is easy to increase this value.

Of course, by increasing the depth of the cuts 4.5, etc., the widths of the unit conductive lines 6, 7 are further reduced, and the capacitance compensation electrodes 8.9 are enlarged, so that the unit conductive lines 6.
Capacitance compensation electrode 8.9
It is also possible to compensate with , and in this case a larger delay time can be obtained.

In this regard, in the conventional example, both the inductance and the capacitance of the unit conducting line were related to its width, so there was a low degree of freedom in selecting dimensions when designing the electromagnetic delay line. However, in the present invention, the width of each unit conducting line and the width of the capacitance can be independently selected.

Greater freedom in design.

Also number 1. In the second unit conductor line 6.7.

If there is a risk that the capacitance increases too much and the characteristic impedance becomes lower than the target value, the first. What is necessary is to reduce the area facing the second unit conducting line 6.7.

Furthermore, if every other ground electrode 12 is removed and only the dielectric layer 11 is placed at the end of the removed portion, the capacitance compensation electrode 8.9 faces the ground electrode 12 on only one side, reducing the capacitance. Therefore, it is possible to prevent the capacitance from increasing too much.

Next, another embodiment of the present invention will be described with reference to FIGS. 7 and 8.

The electromagnetic delay line having the configuration shown in FIG.
A plurality of L-shaped cuts 14 are formed at predetermined intervals from the two end edges 1a between the bent portion 2b and the second bent portion 3a, and the first bent portion 2a and the second bent portion Also between the parts 3b, a plurality of L-shaped notches 15 are formed at intervals from one end edge 1b.

The first unit conductive path 16 is formed by a portion defined by the plurality of notches 14 and one end edge 1b, while the plurality of notches 15
The second unit conductor line 1 is defined by the one end edge 1a.
7 is formed.

Therefore, the capacitive compensation electrode 18.19 has a notch 14.15
It is formed so as to be partitioned into sections, and extends from the middle of the first and second unit conductive lines 16 and 17.

In addition, each cut 14.15 has a cutting depth of 1st.
The notches 4 and 5 shown in the figure are made similarly, but the first. Second
The portions facing the bent portions 2b and 3b are shortened.

Furthermore, the configuration of FIG. Second bent portions 2b and 3
Question a and 1st. A T-shaped cut 20.2 is made from the two end edges 1b and la at each of the second bent portions 2a and 3b.
A plurality of 1. The capacitance compensating electrode 24.25 serves as the second unit conducting line 22.23, and the capacitance compensation electrode 24.25 serves as the first unit conducting line 22.23. Second unit conducting line 22.
It extends from both sides in the middle of 23.

However, first. The depth of the cut 21 is made smaller than the cut 20 so that the center lines of the second unit conductor paths 22 and 23 are separated by the interval T, and the second unit conductive line 22 and 23 are arranged so that the depth of the cut 21 is smaller than that of the cut 20, and the second unit conductive line 22, 23 is formed at the 1° second bent portion 2a and 3.
Question b and 1st. 2 between the second bent portions 2b and 3a
The formation positions from both edge portions 1b and 1a are alternately changed.

In this way, in the present invention, from the conductive band 1 to the cut 4
, 5.14, 15, 20.21 by capacitance compensation electrode 8
, 9.1B, 19, 24.25 is shown, however, the capacitance compensation electrodes can be formed to extend from the unit conductive line by any method.

Furthermore, in the case of an inductance element, the formation is not limited to the example in which the conductive bands forming the first and second unit conductive lines are folded, but the independent unit conductive lines are alternately shifted at intervals T. The object of the present invention can also be achieved by stacking them and connecting them in series by electroless plating or the like at the ends in the direction perpendicular to the one interval T.

In addition to being formed by extending from the unit conductive line, the capacitance compensation electrode may be arranged in a state where it is connected to the unit conductive line through a portion 5 that connects the unit conductive line, for example, through an electroless plating part. Bye.

〔Effect of the invention〕

As explained above, in the electromagnetic delay line of the present invention, the capacitance compensation electrode is connected to the unit conductive line forming the inductance element, so the width of the unit conductive line is narrowed to increase the inductance, and the inductance is decreased in the unit conductive line. This makes it easier to compensate for capacitance caused by

By using a chip, delay time can be increased and the size can be reduced, and the degree of freedom in design can be improved.

[Brief explanation of drawings]

1 and 2 are a developed view and a perspective view illustrating an inductance element constituting the electromagnetic delay line of the present invention, and FIG.
The figure is a schematic diagram 9. showing an inductance element equivalent to the inductance element in Figure 2. 4 to 6 are a plan view, a side view, and a front view (
7 and 8 are diagrams showing other embodiments of the electromagnetic delay line of the present invention. ■...Conductive bands 2a, 2b...First bent portions 3a, 3b...Second bent portions 4.5, 14, 15, 20.21...Notches 6. 16.22・Unit conductor line (first unit conductor line) 7.17.23・Unit conductor line (second unit conductor line) 8.9.18,19,24.25 ・Capacity compensation electrode (electrode ) 10... Inductance element 11...
...Dielectric layer 12...Ground electrodes Q, R...Center line T...Spacing Patent applicant Elmec Co., Ltd. Figure 1 Figure 2 Figure 3 Prisoner 4 Figure 5 Figure M 6 Figure 7

Claims (1)

[Claims] Among a plurality of unit conductive lines stacked at intervals, every other unit conductive line is arranged with its center line shifted by a distance T from the center line of the other unit conductive lines. and an inductance element in which each of the unit conducting lines is sequentially connected in series at an end in a direction perpendicular to the interval T, and an inductance element facing the unit conducting line with a dielectric layer interposed between the adjacent unit conducting lines. 1. An electromagnetic delay line comprising: a ground electrode arranged as a base line; and a capacitive compensation electrode connected to the unit conductive line and disposed opposite the ground electrode.