JPS59144204A - Electromagnetic delay line - Google Patents

Abstract

PURPOSE:To improve delay characteristics and to realize size reduction and use in an ultrahigh frequency band by connecting a capacitor which is connected between a conductor line and the earth to a halfway point of a breadthwise conductor in the line, and dividing it to adjacent sections. CONSTITUTION:The conductor line 3 as a folded conductor line is formed by bending a thin and long conductor integrally, alternately, and perpendicularly at pitch P, and folded conductors 4, 5... folded breadthwise are arranged in parallel to constitute inductance elements. A thin and long beltlike earth electrode 1 is arranged opposite to the folded electrodes 4, 5... under the conductors line 3 while crossing the centers of the folded conductors. Capacitor chips 9... of capacitor C obtained by providing counter electrodes to dielectrics are interposed between the reverse surface centers of the folded conductors and earth electrode 1 by connecting the counter electrodes to the folded conductors 4, 5... and earth electrode 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic delay edge formed by combining an inductance element and a capacitor. This invention relates to an electromagnetic delay line suitable for implementation in Eve'Jnot'IC'4.

Conventionally, electromagnetic delay lines constructed using inductance electrons consisting of planar patterns have been constructed by forming multiple spiral coil patterns together with wiring circuit patterns on a printed circuit board on which general electronic components are mounted. Some have a structure in which coils are connected in series to form an inductance element, and a capacitor is connected between the connection point of each coil and ground.

However, in this structure where a spiral coil is formed on a printed circuit board and combined with a capacitor, the spiral coil and capacitor tend to occupy a large area on the printed circuit board, resulting in the shape being distorted. It was easy to increase the size and the delay characteristics were not sufficient.

On the other hand, as shown in FIG. 1, a zigzag-shaped conducting path 3 called a so-called bent line is formed on the dielectric layer 2 formed on the main surface of the earth electrode 1, and this conducting path 3 is connected to an inductance. There is also an element in which a distributed constant type electromagnetic delay line is constructed by the capacitance formed between the conducting line 3 and the ground electrode 1.

In FIG. 1, the dielectric layer 2 is shown to be bent like the conductive line 3, but it is formed to have a uniform area almost like the ground electrode 1.

It is possible to form the dielectric layer 2 and the conductive line 3 on the pole 1, and also form a capacitor between the conductive line 3 and the earth electrode 1.
As shown by the arrows in the conductor line 3 in the figure, the directions of current flowing through the parallel conductor lines 4, 5, 6, etc. in the conductor line 3 are opposite to each other, so the adjacent conductors The coupling between 4, 5, 6... is negative.

Therefore, the main mutual induction of the inductance elements becomes negative, and the frequency range in which the delay characteristics are even is extremely narrow, resulting in poor delay characteristics such as rise time and output waveform distortion. In particular, in order to improve the formation density of inductance elements,
If the distance between adjacent conductors 4.5.6... is narrowed,
Furthermore, the increase in negative coupling makes implementation in ultra-high frequency bands and miniaturization difficult.

As described above, regardless of the configuration of conventional electromagnetic delay lines, it has been difficult to realize an electromagnetic delay line that has good delay characteristics, is compact, and can be implemented in an ultra-high frequency band.

As a result of careful study of the bent line shown in the conventional example described above, the present invention has been developed to make negative mutual induction between twinkling conductors, which is the main mutual induction in an inductance element, less likely to affect delay characteristics. On the contrary, we found that it is possible to make positive mutual induction the main mutual induction.

The present invention was made under these circumstances, and aims to provide an electromagnetic delay line that has good delay characteristics, is compact, and can be implemented in an ultra-high frequency band.

To achieve this objective, the present invention provides a bent conductor line,
In an electromagnetic delay line that includes a capacitor connected between the conductive line and the ground and has a plurality of sections, the capacitor wall is connected in the middle of the conductor in the 1 pF@ direction in the conductive line, and It is characterized by being divided into adjacent sections.

According to such a configuration of the present invention, it is possible to make the mutual induction between adjacent sections into a positive coupling state, and it is possible to improve delay characteristics and also to ensure miniaturization and use in an ultra-high frequency band. can.

The present invention will be explained in detail below. Note that parts common to the conventional example are given the same reference numerals.

2 and 3 are a perspective view and a schematic plan view showing an embodiment of the electromagnetic delay line according to the present invention.

The conductor line 3 as a bent conductor line is formed by integrally bending a thin and long conductor at a predetermined pitch P so as to be bent alternately and at right angles.
Folded honorifics folded in the (2W) direction 4.5.
6... are arranged in parallel, forming an inductance element. Note that the reference numerals 7.8, . . . are connecting portions that connect the respective folded conducting wires 4, 5, 6, .

Below the conductor line 3, each folded conductor line 4,5,6...
An elongated strip-shaped ground electrode 1 is connected to the conductive wire 4 along the virtual line Y-Y that crosses the center of each at a right angle.
5.6... are arranged opposite to each other.

Between the center of the lower surface of each folded conductor 4, 5, 6... and the ground electrode 1, a chip-shaped capacitor 9 having a capacitance C with a counter electrode formed on a dielectric material is connected to the folded conductor 4.・A lumped constant type electromagnetic delay term is constructed by being connected to 5, 6, and the earth electrode 1.

This electromagnetic delay line is formed by arranging a capacitor at a portion of each of the folded conductors 4.5.6, .
6... and their connecting parts 7.8, as shown in FIG. 5 and the connecting portion 7 are points B and E, the opening-shaped conducting wire portion 10 connected at each point A, B, E, and F forms an inductance L for one section, and similarly the folding portion 4 If the boundaries between the exhaust 5.6 and the connecting portion 8 are points G and H, then the opening-shaped conducting wire portions 11 connected at each point F, G, H, and J are connected to the adjacent inductance element 1.
An inductance L for each section is formed, and the electromagnetic delay line is composed of a plurality of sections.

Inductance L for one section, for example, folded conductor 4.
5 and point 4 of connecting portion 7. Mutual induction included in the inductance L of the opening-shaped conducting wire portion 10 formed by B, E, and F is formed between two parallel conducting wires of length W at points A=B and points E-F. Negative mutual induction between adjacent folded conductors 4 and 5 (due to reverse current in folded conductors 4 and 5) is the main mutual induction in conductor line 3.
A half of the length W is included in the inductance L of one section. This negative coupling only has the effect of reducing the inductance L in one section.

Figure 4 is an equivalent circuit of the electromagnetic delay line shown in Figure 2. Symbol a1 is the coupling coefficient between adjacent inductances L. Symbol a2 is the coupling coefficient between the second inductance L. Symbol an is the coupling coefficient between adjacent inductances L. This is the coupling coefficient between the n-th inductance L, and the coupling coefficient with the leftmost inductance L in the figure is shown, but there is also an inductance L on the left side.
The other inductances are similarly connected to the left and right inductances L.

Next, regarding the electromagnetic delay line of the present invention configured as described above, the coupling state of each section, especially the coupling coefficient a of adjacent sections, will be explained.
1 will be explained with reference to FIGS. 3 and 5.

In both figures, a capacitor 9 is placed in the center of the folded conductor 5.
is connected, and the folded conductor 5 is connected to point A by this connection.
, B, E, F and the points F, G.
, H, and J to form adjacent sections, and both U-shaped conducting wire sections 10.11
The sign and value of the mutual induction of determines the coupling coefficient %al.

FIG. 5 shows all the mutual guidance formed between the mouth-shaped conductor parts 10 and 11, and the connecting parts (points B-E, G
-H')7.8 Ml, point E on folded conductor 5
M2 is the mutual guidance between -F and point FG, and M3 is the mutual guidance between point A-B and point H-J in folded conductors 4 and 6.
, point A-B and point F-G in folded conductors 4 and 5
If the mutual induction between them is M4, and the mutual induction between points E-F and H'-J in folded conductors 5 and 6 is M5, the current directions in M1 to M3 are the same, so they are positive coupled. - M4 and M5 have negative coupling because the current directions are opposite. Note that M1 to M5 are shown as absolute values.

Therefore, the mutual induction between the two U-shaped conductor portions 10 and 11 is...
M l + M 2 + M 37 M 4 M s
becomes. Regarding M2 to M5, the distance relationship holds that M2>M4''M5, > M3, and furthermore, there is a relationship of 44-ki to KM2+M3-, )O.
Therefore, if we summarize these relationships and Ml of positive coupling, the coupling coefficient a1 is always positive 0.Moreover, the coupling coefficient 21 is the folded conductors 4, 5, 6, etc.
Various values can be obtained depending on the length of the conductor line 3 in the width direction (2W or W), the thickness of the folded conductor line 4, 5, 6, the pinch P, etc., so select the optimal value. It is possible, on the other hand, that the mutual inductions M4 and M5 are one element constituting the negative main mutual induction in the conducting line 3, or are always smaller than the other positive couplings contained in al and constituting 211. -Does not have an adverse effect on the inductance element, such as making al negative.

Next, the mutual induction between points E-F and J- in the folded conductors 5 and 6 is negative because the direction of the current flowing is opposite, and this is also due to the negative main mutual induction in the conductor line 3. One element that constitutes the guidance is the U-shaped conducting wire portion 10.
It is included in the coupling coefficient 32 between the second scanning interval and the second scan interval, and since it is generally desirable for a2 to be a negative coupling in a delay line, it functions usefully for a2.

In this way, the electromagnetic delay line according to the present invention is constructed by: - Inducting the main negative mutual induction occurring in the conducting line 3 constituting the inductance element into one section's worth of inductance, and dividing it into the coupling coefficients a1 and a2 between the inductance L. By including it, the effect can be suppressed and the coupling coefficient 31 can be made positive, so even if a conventional conducting line 3 is used, delay characteristics such as rise time and output waveform distortion can be maintained in a wide frequency band. can be kept.

Since the electromagnetic delay line of the present invention uses the conductive line 3, it can be easily constructed by applying film forming technology such as thick film or thin film, and it is possible to improve mass productivity and reduce the size. .

6 and 7 are cross-sectional views showing embodiments of the pond of the present invention suitable for construction using film forming technology, and are not shown in the cross-sectional structure in the X-X direction in FIG. 3 above. be.

What is shown in FIG. 6 is a narrow dielectric layer 12 made of a dielectric material having a high dielectric constant, such as ceramic, and extending along the axial direction, that is, the virtual line direction, of the conductor path 3, which will be described later, on the ground electrode 1.
A thin film is formed by sputtering or the like, and an insulating paste containing glass as a main component and having a lower dielectric constant than the dielectric layer 12 is printed on the ground electrode 1 around the dielectric layer 12.

The insulating layer 13 is fired to form a thick film that is thicker than the dielectric layer 12 and runs on the upper edge of the dielectric layer 12, and a conductive paste is applied on the dielectric layer 12 and the insulating layer 13 as described above. An inductance element is formed by printing in the same shape as the conductor line 3 in FIG. It constitutes an electromagnetic delay line.

Note that the dielectric layer 12 overlaps the folded conductive wire 14 at the center, and since the dielectric layer 12 is thinner than the insulator layer 13 at this center, it has a somewhat concave shape. It has almost no effect on induction, and since the insulating layer 13 overlaps the upper edge of the dielectric layer 12, there is no short circuit with the ground electrode 1 when forming the conductive path 3. It is not necessary to form it widely in the region where the conductive line 3 is formed, and it may be formed in a long and narrow strip shape so as to cross the folded conductive wire 14, as shown in FIG. 2, for example. In that case, the ground electrode 1, the dielectric layer 12, the insulator layer 13, and the bent conductive path 3 may be sequentially formed on a substrate (not shown).

Further, in FIG. 7, a protrusion 15 is provided on the earth electrode 1, and an insulating paste with a low dielectric constant is applied to the protrusion 15 on the earth electrode 1.
5 is printed and fired to form a thick insulating layer 13, and a conductive line 3 is formed using conductive paste on this insulating layer 13 so as to face the central part of the folded conductive wire 14 or the protrusion 15. The electromagnetic delay line with this configuration is similar to the electromagnetic delay line shown in FIG. Insulator layer 13 with low dielectric constant
A part of the ground electrode 1 is made to protrude into the insulating layer 13 toward the folded conducting wire 14 by using the folded conducting wire 14, and the capacitor 9 is formed in the center of the folded conducting wire 14 by narrowing the distance. Even in the embodiment shown in FIG. 7, it is possible to make the earthing lamp 1 elongated.

It is also possible to form a dielectric layer made of a material with a high dielectric constant at the tip of the protruding portion 15 of the earth electrode 1, and to perform the steps in FIGS. 6 and 7 together. This is effective because the capacitors 9 are formed in a more concentrated manner.

Next, an embodiment of the conductive line 3 in the inductance element constituting the electromagnetic delay line of the present invention will be described. FIGS. 8A to 8D are plan views showing the conductive line 3. FIG.

The same JA provides a capacitor electrode 16 wider than the υ1 folded conductor wire in the center of the folded conductor wires 4, 5, 6, etc. in the conductor line 3 as shown in FIG.
．． 5. The capacitor force (is formed in a concentrated manner) at the center of 6...

8B-D are formed by folding back the folded conducting wires 4.6.6... with an inclination to the axial direction, and FIG. 8B shows the opening formed by the folded conducting wires 4.5.6... In other words, the opposite side of the connecting part 7.8... is formed narrower than the connecting part 7.8..., and if the dimension in the width (2W) direction and the pitch P are the same as in the same figure, then , the value of each inductance L increases, while the coupling coefficient a1 decreases.

In Fig. 8C, the connecting portions 7.8... are short, and the folded conductors 4.
5.6... is formed wider than the connecting part 7.8..., and if the dimensions in the width (2W') direction and the pitch P are the same compared to A in the same figure, then each inductance L decreases, and the coupling coefficient 81 increases.

Furthermore, in FIG. 8D, the connecting portions 7.8... are omitted, and the folded guide v! 4, 5, 6, etc. are formed into a sawtooth shape.The coupling coefficient 31 is even sharper than that of C in the same figure.

Furthermore, in the present invention, the conductive line 3 is not limited to being formed of a thin and elongated conductor, but it is also possible to form it with a conductor having a circular cross-sectional shape. It is not limited to the case where it is formed, but it is also possible to form it three-dimensionally, for example, by attaching it to the outer periphery of a bobbin having a rectangular cross section, which facilitates miniaturization.

On the other hand, the capacitors 9 connected to the conductor line 3 do not need to be formed precisely in the center of each folded conductor 4.5.6, but are alternately formed in opposite directions in adjacent folded conductors 4.5.6. It may be formed in a staggered manner offset from the center. Although the combined body % a 1 becomes somewhat smaller, the purpose of the present invention can be achieved, and the position where the capacitor 9 is connected can be adjusted according to the desired delay characteristics. do it. Note that the ground electrode 1 is also connected to the capacitor 9. Various pattern shapes may be formed depending on the position where the pattern is formed.

As explained above, the electromagnetic delay line of the present invention is constructed by connecting a capacitor midway through the folded conductor in the bent conductor, that is, the conductor in the width direction of the bent conductor, and dividing the conductor into adjacent sections midway. - It is possible to maintain good delay characteristics, and it is easy to create a small f-hi.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing a conventional electromagnetic delay line, Figures 2 to 4
The figures are a perspective view, a schematic plan view, and an equivalent circuit diagram showing one embodiment of the electromagnetic delay line of the present invention, FIG. 5 is a diagram showing the coupling state of adjacent sections in the electromagnetic delay line of FIG. 2, and FIG. FIG. 7 is a sectional view showing an embodiment of the pond of the present invention, and FIG. 8 is a plan view showing another embodiment of the bent conductive path constituting the inductance element. 1... Earth electrode, 2.12... Dielectric layer, 3... Bent guide path, 4, 5, 6.14...
...7F repeating conductor, 7.8...Connection part, 9...
・Capacitor, 10.11... U-shaped conducting wire part ・13...Insulator layer ・15...Protrusion part Patent applicant Elmec Co., Ltd. No. 1 Zuo 2 Field A'3 Reverse O, 4 Field O 5 Reverse O 6 Reverse O 7 Vines

Claims (5)

[Claims] (1) In an electromagnetic line having a plurality of sections, comprising a bent conductive line and a capacitor connected between the conductive line and the ground, the capacitor is connected to the conductor in the width direction of the conductive line. An electromagnetic delay line characterized by being connected in the middle and divided into adjacent sections in the middle of this conductor. (2) The electromagnetic delay line according to claim 1, wherein the capacitor is arranged on a virtual line that crosses the center of each conductor in the width direction. (3) The electromagnetic delay line according to claim 1, wherein the capacitors are arranged at positions alternately shifted in opposite directions with respect to a virtual forest that crosses the center of each conductor in the width direction. (4) A bent conducting path is formed on the insulating layer, and the capacitor is connected to the conducting wire on the ground electrode on a dielectric body layer having a higher dielectric constant than the insulating layer and formed thinner. An electromagnetic delay line according to any one of claims 1 to 3, which is formed by overlapping conductors in the width direction of the path. (5) A bent conductive line is formed on the insulating layer, and a capacitor is formed with a part of the ground electrode protruding into the insulating layer toward the conductor in the width direction of the conductive line. The electromagnetic delay line 0 according to any one of claims 1 to 3