JPS62274910A - Electromagnetic delay line - Google Patents

Abstract

PURPOSE:To make a device thin and improve the delay characteristic by forming an inductance element so that a ratio of intervals W of a conductor between shorter sides of the cross section of a bobbin to intervals T of that between longer sides is specific value. CONSTITUTION:With respect to an electromagnetic delay line, intervals T of the center of a conductor 9 between longer sides of the cross section of a bobbin 7 and intervals W of that between shorter sides are selected to satisfy the condition of W/T>10 and an inductance element 11 is formed. The inductance element 11 having slightly shorter intervals T is shown in the figure for convenience' sake. If the ratio W/T is set to >=10, the delay line has a shorter rise time in case of the same number of sections; and if the ratio W/T is made higher furthermore, the number of storable sections per a unit length of the inductance element 11 is increased because it is necessary to reduce a pitch S, and a high-density constitution where a larger number of sections are stored is obtained.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an electromagnetic delay line, in particular, a rise time of 2~
The present invention relates to an extremely thin electromagnetic delay line that can be applied in a wide range of fields, from relatively high-speed fields of 3 ns to ultra-high speed fields with rise times of less than ins.

[Conventional technology]

In general, it is well known that electromagnetic delay lines have a configuration in which multiple capacitors are connected in a ladder shape to an inductance element wound with a conductive wire, and the inductance element has a high Q and good quality by obtaining a large inductance with a small number of turns. Because it was thought that this would be the case, it was formed by winding a conductor wire around a magnetic bobbin such as ferrite.

However, as the applied frequency increases, magnetic bobbins have their own frequency characteristics and loss increases, making them difficult to use. In many cases, an inductance element is formed using a bobbin.

Furthermore, for inductance elements that use non-magnetic bobbins, it is thought that it is better to obtain a large inductance with 5 fewer turns, since the higher the Q, the lower the loss. It was thought that it was best to wind the conductors in a single-layer solenoid pattern.

In such a situation, when constructing a thin and high-speed electromagnetic delay line, as shown in FIG.

A conductive wire 3 is attached to a rod-shaped bobbin 1 made of a non-magnetic material and having a rectangular cross section.
The inductance element 5 was formed by winding a plurality of turns into a single-layer solenoid shape, and a capacitor C was connected to each predetermined turn of the inductance element 5 in a ladder shape.

FIG. 7 is an equivalent circuit diagram of the electromagnetic delay line.

The coils in the adjacent section of the inductance element 5 are coupled with each other with a coupling coefficient a], the coils in the section separated by 1 are coupled with each other, and the coils in the section separated by 2 are coupled with each other with a coupling coefficient a2. They are connected sequentially at a3.

[Problem that the invention seeks to solve]

However, in the thin electromagnetic delay line configured in this way, when paying attention to the direction of the coupling coefficient between the coils L in one section, the odd-numbered coupling coefficient a1. a3
... is positive and the even-numbered coupling pot coefficient a2. Although it is said that a4 ... is negative or preferable, the coupling coefficients al, a2
.

a3: All aTl values were positive, which was unfavorable.

In addition, the ratio W/T of the distance T between the centers of the conducting wires 3 facing each other in the direction between the long sides of the bobbin 1 and the distance W between the centers of the conducting wires 3 facing each other in the direction between the short sides of the bobbin 1 is extremely increased. When an electromagnetic delay line is configured, the Q of the inductance element 3 becomes low and loss becomes large.

It was considered inappropriate.

Therefore, in the conventional electromagnetic delay line, the value of W/T was selected to be about 1=4, so there was a limit to the 1wi type.

The inventor of the present invention made extensive studies on the flatly wound inductance element 3 in the electromagnetic delay line described above, and found that if the value of W/T described above is gradually increased from 1, the delay line becomes It has been found that, although the characteristics as a result of this change deteriorate, the characteristics improve when exceeding this range.

The present invention was made under these circumstances.

-3= The purpose is to provide an electromagnetic delay line that is extremely thin and has good delay characteristics.

[Means for solving problems]

In order to solve these problems, the present invention consists of forming an inductance element 11 by forming a plurality of turns of a conductor 9 in the shape of a single layer solenoid on a flat and elongated non-magnetic bobbin 7, as shown in FIG. , a plurality of capacitors C are connected in a ladder shape for each plurality of turns of the inductance element 11 to constitute a lumped constant type electromagnetic delay line having a plurality of sections, and between the conductors 9 facing each other in the direction between the long sides of the bobbin 7. The inductance element 11 is wound so that the ratio of the distances T and W is W/T≧10, where T is the distance between the conductors 9 and W is the distance between the conductors 9 facing each other in the short side direction. .

[For production]

In the present invention having such a means, when the inductance element 11 is formed to satisfy the condition of W/T≧10, the conducting wires 9 facing each other in the direction between the short sides hardly affect the characteristics, and the long sides Characteristics are obtained exclusively by the conducting wires 9 facing each other in the direction between them.

Moreover, in order to reduce the interval T and obtain the same characteristics in the inductance element 11, it is necessary to reduce the distance between the coils in each section, and the coupling between the coils L in adjacent sections becomes stronger on the positive side, while the The difference between the coupling and the mutual coupling between the coils in one section becomes large.

〔Example〕

The present invention will be explained in detail below.

FIG. 1 is a partial perspective view showing an embodiment of the electromagnetic delay line of the present invention, and the structure is generally similar to that shown in FIG. 6.

In the figure, on the outer periphery of a flat and elongated rod-shaped bobbin 7 made of a non-magnetic material, three conductive wires 9 are arranged at a pitch P in the shape of a 1i-layer solenoid.
The coil L for one section is formed by winding turns, and similar coils L for the next section are sequentially wound in series at a pitch S to form the inductance element 11. That is,
Symbol P is the winding pitch of the coil L in each section, and symbol S
is the pinch of each section.

61 The conducting wire 9 that constitutes the inductance element II is as follows.

One narrow side of the bobbin 7 serves as a connecting part that moves diagonally to the coil of the next section, and a plurality of capacitors C are connected in a ladder shape between the central part of the connecting part and the ground. An electromagnetic delay line is configured.

9 In the electromagnetic delay line of the present invention, the distance between the centers of the conducting wires 9 facing each other in the direction between the long sides in the cross section of the bobbin 7 is T, and the distance between the centers of the conducting wires 9 facing each other in the direction between the short sides is W. In this case, the inductance element 11 is formed by selecting the 9-intervals T and W within a range that satisfies the condition of W/T≧10.

In FIG. 1, the inductance element 11 is shown with the two-way interval T slightly longer for convenience.

The equivalent circuit of an electromagnetic delay line with this configuration is the same as that shown in FIG. is the coupling coefficient a2, and the coils in the two sections are sequentially coupled with each other with the coupling coefficient a3.
See diagram.

Next, the electromagnetic delay line of the present invention described above will be considered.

FIG. 2 shows the relationship between the cutoff frequency and the ratio W/T of the interval T and W between the inductance elements 11 in the electromagnetic delay line, with W/T taken as the horizontal axis.

The vertical axis G represents the ratio fc'/f of the cutoff frequency fc' when W/T is changed with respect to the cutoff frequency jc when W/T=1.

In the figure, each of the curves ■ to ■ is obtained by winding a conducting wire 9 with a diameter of 0.1 mm at a pitch P = 0.11 mm to form an inductance element 11, but the two curves are for one section of three tangents. The inductance element 11 formed by the coil L is
W/T was varied from 1 to 100 so that the characteristic impedance was always 100Ω and the delay time in 10 sections was 1.0 ns.

and a coupling coefficient of 21. This is a theoretical value obtained by adjusting the pitch S so as to keep the phase delay distortion at 5% when considering a2.

Curves ■ and ■ are for inductance elements 11 in which the number of windings in one section is 5 turns and 10 turns, respectively.

W/T was changed so that the delay time of 10 sections was 8.7 ns and 25 ns with a characteristic impedance of 100 Ω, and the coupling coefficient was 81. Considering a2, the phase delay distortion is 5
This is a theoretical value obtained by adjusting the pitch S so that the pitch S is maintained at %.

What can be seen from this figure 2 is that the ratio of 1 interval W and T is W/
When the value of T is increased from 1, the cutoff frequency becomes lower until the value reaches around 10, but beyond that, the cutoff frequency becomes higher than when W/T=1.

Therefore, when W/T is increased to 10 or more, a delay line with a fast rise time can be obtained even with the same number of sections, contrary to what was previously thought to be unsuitable.Additionally, the following advantages are obtained: be.

That is, as will be described later, if W/T is increased, the pitch S must be decreased.

The number of sections that can be accommodated per unit length of the inductance element 11 increases, and a high-density configuration that accommodates a large number of two sections can be realized.

Further, when W/T is set to 10 or more, a very thin inductance element 11 can be obtained, resulting in a very thin electromagnetic delay line.

Moreover, in the high-speed and ultra-high-speed fields, inductance elements 1
Since the inductance value required in 1 is small, the number of windings of the coil L in each section may be small, so it is possible to use the conducting wire 9 with a large wire diameter, resulting in less loss.

As described above, the electromagnetic delay line of the present invention can obtain good delay characteristics in spite of its thinness.First, we will examine the reason why this effect is obtained.

FIG. 3 is a longitudinal cross-sectional view of the coil L for three sections of the inductance element 11 shown in FIG. ing.

In addition, each coil for one section starts winding the conductor 9 from the bottom of the left end in a single layer solenoid shape at a pitch P, ends at the top with the third turn, passes through the side to the next section, and then winds again from the bottom. It has been started.

In such an inductance element 11, in each coil L, the lower conductor 9 is shifted to the left by P/2 with respect to the upper conductor 9 even if the conductors 9 have the same turn. Considering the connection between conductive wires 9 in the same section.

The upper three wires and the lower three wires have the same direction of current, have positive coupling, and act in a direction that increases the inductance for one section.

Since the directions of current flow between the upper conducting wire 9 and the lower conducting wire 9 are different, they form a negative coupling and act in a direction that reduces the inductance of one section.

Therefore, as the interval T gradually decreases, the negative coupling in each interval becomes stronger and the inductance decreases, and to obtain the same delay time, it is necessary to maintain the same inductance by increasing the interval W as the interval T decreases. .

Here, considering the mutual coupling between coils L in adjacent sections, 2
There is a mutual inductance of M10 between one conducting wire 9a at the upper left end in the figure and the conducting wire 9b at the upper end of the coil L adjacent to the right, and Ml- Suppose there is a mutual inductance of Similarly 1
The conductor 9a and the conductor 9d are also connected between the coils L in the open section.
, 9e and there is a mutual inductance of M2+ and a mutual inductance of M2-.

Note that, in reality, there is coupling between all of the conductive wires 9, but for the sake of convenience, only one of the above-mentioned wires will be considered.

Due to the direction of the current, the mutual inductance M1+ is positive and the mutual inductance M1- is a negative coupling.

Now, if the pitch S is made constant and the interval T is made small, the distance between the conducting wires 9a and 9e that constitute the mutual inductance M1- becomes small, and the absolute value of the mutual inductance M1 increases. That is, the coupling coefficient a1 in FIG. 7 is the sum of the mutual inductances Ml+ and M]-, which is a positive value, but by reducing the two-way interval T, the value of the mutual inductance M1- increases, and the coupling coefficient 31 becomes Decrease.

Therefore, in order to reduce the interval T and keep the coupling coefficient al the same, it is necessary to reduce the pitch S and increase M1+. In other words, by reducing the size of the electromagnetic delay line in the longitudinal direction of the bobbin 7, the value of the coupling coefficient 31 is maintained.

On the other hand, regarding the mutual coupling coefficient a2 of the coils in one section, the upper mutual inductance element 10 is positive and the lower mutual inductance M2- is negative, but the sum of them becomes the coupling coefficient a2 and its value is positive.

Then, if the 9-interval T is made smaller, the mutual inductance M
The absolute value of 2 increases, and the coupling coefficient a2 decreases. In the case of the coupling coefficient a1, the pitch S was made smaller in order to make the reduced coupling coefficient al the same as the original one by reducing the interval T, but the coupling coefficient a2 is cannot be recovered.

That is, if the 9-interval T is made smaller, the pitch S must be made smaller in order to maintain the same delay characteristics.

In this case, the rate of change in the coupling coefficients a1 and a2 is different,
The coupling coefficient a2 does not become very large, and the difference from the coupling coefficient a1 increases.

Originally, it is desirable that the coupling coefficient a2 be a negative value, but in the configuration shown in FIG. 1, the coupling coefficient a2 is positive, so it is desirable that the coupling coefficient a2 be as small as possible. If the pitch S is reduced by decreasing the interval T between two points of this = 12-, the coupling coefficient becomes 21. The relationship a2 changes in a desirable direction.

On the other hand, the inductance element 11 that satisfies the relationship W/T=1 is one in which a conducting wire is wound around a bobbin that has a square cross section instead of the flat bobbin 7 as shown in FIG. At first, the influence between the conductive wires (conductor wires on the T side) facing each other in the short side direction appears in the characteristics.

That is, when changing from the case where W/T=1.

As can be seen when the symbol T in FIG. 3 is replaced with the symbol W, the interval T in FIG. 3 changes to become larger, and the coupling coefficient aI +
This causes the relationship of a2 to work in an undesirable direction.

Then, until the value of W/T is around 10, an undesirable effect appears on the entire electromagnetic delay line, but when it exceeds that value, the conductor 9 on the T side has a length that has almost no effect on the coupling coefficient "1 + a2," It can be seen that al and a2 are determined in the W side conductor 9, and as a result, the cutoff frequency = 14 = becomes high.

The bobbin of the present invention is not limited to a bobbin with a rectangular cross section as shown in FIG. 1, but may also be a bobbin 13 with a circular thin end for convenient winding as shown in FIG.
Alternatively, although not shown, it is possible to form a gentle curve in a flat portion.

Furthermore, as shown in FIG. 5, the electromagnetic delay line of the present invention can also have a configuration in which a plurality of capacitors C are connected in a ladder shape to the middle part of the coil L in each section, and each of the plurality of turns of the inductance element is It may be configured by connecting a plurality of capacitors in a ladder shape.

By the way, in the embodiment of the electromagnetic delay line of the present invention described above,
Although an example has been shown in which the inductance element 11 is formed by winding the conducting wire 9 around the bobbin 7, the present invention is not limited thereto. For example, a conductor layer may be formed on the outer periphery of the bobbin 7, and an inductance element may be formed on the bobbin by etching or laser processing. In short, the object of the present invention can be achieved by forming an inductance element by forming a conductor in the shape of a single-layer solenoid on a flat bobbin.

〔Effect of the invention〕

As explained above, the electromagnetic delay line of the present invention is an inductance element in which a conductor is formed in the shape of a single layer solenoid with a plurality of turns of coil as one section on a flat and elongated non-magnetic bobbin. Since the inductance element is formed so that the ratio of the distance W between the conductors facing each other in the side-to-side direction and the distance T between the conductors facing each other in the short-side direction is W/T≧10, it is extremely thin and has a low delay. It is possible to maintain and improve the characteristics.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view showing one embodiment of the present invention. FIGS. 2 and 3 are diagrams theoretically explaining the electromagnetic delay line shown in FIG. 1, FIG. 4 is a side view showing another example of the bobbin used in the electromagnetic delay line of the present invention, and FIG. FIGS. 6 and 7 are circuit diagrams showing still other embodiments of the present invention, and are a partial perspective view showing an electromagnetic delay line and an equivalent circuit diagram thereof, which serve as a reference for the present invention. 1.7.13・Bobbin 3.9・・・Conductor 5.11・・Inductance element C・・・Capacitor L・・・Coil W of 1 section, T・・・Conductor (conductor) spacing patent applicant
Elmec Co., Ltd. = 16-1 Figure 11 Interface #C in each Figure 2 Figure 3

Claims (1)

[Claims] A flat and elongated non-magnetic bobbin, an inductance element formed by forming a plurality of turns of a conductor in the shape of a single-layer solenoid on the bobbin, and a capacitor connected to each of the plurality of turns of the inductance element in a ladder shape. In a lumped constant electromagnetic delay line having a plurality of sections, the conductors face each other in the direction between the long sides of the bobbin, and the distance between the conductors facing each other in the direction between the long sides of the bobbin is T, and the conductors face each other in the direction between the short sides of the bobbin. When the distance between conductors is W, the ratio of the distance T and W is W/
An electromagnetic delay line characterized in that the inductance element is formed so that T≧10.