JPS6047510A - Electromagnetic delay line - Google Patents

Abstract

PURPOSE:To obtain the optimum coefficient of coupling between respective sections by arranging the 1st and the 2nd sections corresponding to the different numbers of turns of conductors alternately, and providing inductance elements which differ in positive and negative between conductors between respective sections. CONSTITUTION:A flat bobbin 1 which is rectangularly sectioned is space-wound with a conductor 2 at pitch P in a single-layer solenoid shape to form an inductance element 3. Capacitors C are connected in a lattice shape between the ground and conductor 2 at, for example, a 1.5-turn, a 1-turn... point on the basis of a left-side conductor 2 on the reverse surface of the bobbin 1 to form an electromagnetic delay line 4. The delay line 4 includes the winding corresponding to the 1.5 turns in the 2nd section of an inductance L and the winding corresponding to the 1 turn in the 1st section; and those are arranged alternately. Then, different values are obtained in the 1st and the 2nd sections of even-numbered coupling.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electromagnetic delay line formed by combining an inductance element and a capacitor in a ladder shape.
The present invention relates to improvements in electromagnetic delay lines that can obtain a wide range of rise characteristics, from ultra-high speeds of 00 ps or less to relatively fast ones of about 10 ns, and that can be used in digital and analog circuits.

[Prior art and its problems]

Such an electromagnetic delay line with a relatively fast rise time is formed by connecting multiple inductances in series to form an inductance element, and by connecting a capacitor between each adjacent inductance and the ground to form a ladder shape. There is a configuration that looks like this.

Particularly, in order to reduce the size of the inductance, there is a structure in which the inductance is coaxially wound on a rod-shaped bobbin at predetermined intervals.

In such an electromagnetic delay line, the coupling coefficient formed between adjacent inductances is al, the coupling coefficient formed between two inductances is a2, and the coupling coefficient between two inductances is a3+. (If the coupling coefficient formed between the n-1> inductances is a71, it is known that the coupling coefficients al and a2 in particular greatly influence the delay characteristics of the electromagnetic delay line.

Conventionally, the value of the coupling coefficient a1 is set to 81-0, 1 to 0.
．． 2, the value of the coupling coefficient a2 is 82 = -0,015 ~
−0,03, the value of the coupling coefficient a3 is a s =0.01~
It is said that good delay characteristics can be obtained by selecting each to be about 0.02.

Conventionally, to obtain such good delay characteristics.

The direction of coupling of each inductance constituting the electromagnetic delay line was devised to obtain a positive coupling coefficient 81 and a negative coupling coefficient a2.

However, when configuring an electromagnetic delay line, in reality the coupling coefficient between inductances in the inductance element is ``I+
It is difficult to obtain the above-mentioned theoretical optimum value or a value close to this as the value of a2, and especially when multiple inductances are wound coaxially on a rod-shaped bobbin and connected in series, the coupling coefficient aI + The value of a2 tends to become large.

Furthermore, if the direction of coupling is changed by, for example, changing the winding direction of the inductance in order to obtain the optimum value of the coupling coefficient aI+82, there is a drawback that the structure of the inductance tends to become complicated and manufacturing becomes troublesome.

[Purpose of the invention]

The present invention has been made under these circumstances, and aims to provide an electromagnetic delay line that is easy to obtain the optimum value of the coupling coefficient, provides good delay characteristics, and has a simple structure.

[Structure and effects of the invention]

That is, the present invention provides an electromagnetic delay line including an inductance element having a conductor wound thereon, and a capacitor connected between the conductor and the ground, and having a plurality of sections, the inductance element having an integer number of turns of the conductor. A first section and a second section that differs by 0.5 turns from the first section are arranged alternately, and positive mutual induction and negative mutual induction are formed between the conductors of the first and second sections. The numbers are different.

According to the configuration of the present invention, it is easy to obtain an optimal coupling coefficient between the inductances forming the inductance element,9 and it is possible to obtain good delay characteristics such as a fast rise time. It has the advantage of being simple.

[Embodiments of the invention]

Hereinafter, nine aspects of the present invention will be described in detail.

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

FIG. 3 is its equivalent circuit diagram.

1 and 2, a conductor 2 is space-wound at a pitch P in a single-layer solenoid shape around a flat bobbin 1 having a rectangular cross section, thereby forming an inductance element 3. Note that the symbol W in FIG. 1 is the distance between the conductors 2 in the long side direction of the bobbin 1.

The symbol T is the distance between the conductors 2 in the short side direction of the bobbin 1.

For example, 1 in the inductance element 3, 1
．． Conductor 2 of 5th turn, 1st turn, etc. (each A2
An electromagnetic delay line 4 is formed by connecting a capacitor C in the form of a ladder between the point +A3 point) (repetition of the 1.5th turn and the 1st Kuhn) and the ground.

The electromagnetic delay line 4 configured in this manner has a winding of 1.5 tanns as the second section of inductance L, and a winding of 1 tannin as the first section of inductance L'. The structure is as shown in FIG. 3, in which the cells are arranged alternately.

In the second section of the inductance L and the other first and second sections, the coupling coefficient aI + a2 is calculated in order from the adjacent sections.
+a3+..., and between the first section of the inductance L' and the other first and second sections, the coupling coefficient aita! is applied in order from the adjacent sections. +a3+... is connected. That is, for even-numbered connections, the first and second sections have different values.

In addition, in FIG. 3, attention is paid to the section on the left side in FIG. 2, and the connections on the right side are shown, but in reality, there are also connections on the left side, and the area is symmetrical.

Next, the electromagnetic delay line configured in this way will be considered in detail.

Figure 4 shows the conductor 2 in the cross section between x and x' in Figure 1.
Based on the conductor indicated by diagonal lines in the upper left (meaning a conductor with length W2 + (P/2)2 of the W side upper surface), the W side upper and lower surfaces located to the right of it are shown. This shows the mutual induction relationship between conductors.

In the same figure, since the direction of current is the same in the same column, they form a positive bond and become Mo+, MO2, and MO3 in that order.

..., and since the direction of the current is opposite to that of the other columns, there is a negative coupling, resulting in Mn, M+2, M+3, .
··have. Note that the same coupling is symmetrically located to the left in Figure 2, and all conductors other than those indicated by diagonal lines have similar couplings.

For ease of explanation, a case will be considered in which T is smaller than W and the T side can be omitted.The portion surrounded by the broken line in FIG. 4 is a group of conductors constituting one section.

The conductor group on the left constitutes an inductance consisting of three conductors, the next conductor group consists of two conductors and constitutes an inductance L', and the following three conductors in order.

Repeat the two conductor groups. Here, in every other three conductor groups, 0.5 turn portions are arranged vertically alternately.

In this case, the relationship between each inductance L, L' and the coupling coefficient aI + a2 + "2' + a3 in Fig. 3 is expressed by the following formula (1) (2) where Ls is the inductance of one conductor. ) al-translation dankahi ni sho-...white (3) 几P ・ = God and side → 艷赴さ...(4) L / M02 order MO3-2° MI3 a2- , ・(5) If we pay attention to the number of positive and negative mutual inductions in each of the above equations (3) to (6), there are three positive and negative mutual inductions in the odd-numbered coupling coefficients a1 and a3. On the other hand, for the even-numbered coupling coefficient a2, there are 4 positive values and 5 negative values,
Coupling coefficient a! ′ exists in both positive and negative numbers. That is, the coupling coefficient a! Only one more number of negative mutual inductions.

The value of mutual induction becomes thicker as the distance between the conductors 2 becomes shorter, but since each value of mutual induction in the same formula in each equation belongs to the same conductor group, the values do not differ greatly,
It is composed of multiple mutual inductions that differ slightly from each other.

Therefore, in the conventional electromagnetic delay line, L = L' and a2 =
a, /, but in the configuration of the present invention described above, generally a
1>32'>a3>OT:a2<
It becomes Q. So + I a 2 I) a! '
By making it so, the positive value of a2' can be compensated with the negative value of a2, so that the combination of a2 and a2' can have ideal characteristics with a negative value as a whole.

As described above, the present invention is characterized in that negative coupling is easily realized by increasing the number of negative mutual inductions between the conductors 2 in each section than the number of positive mutual inductions, and the inductance The structure of element 3 becomes very simple.

In the above configuration, the second section in which the conductor 2 is wound with 1.5 turns and the first section in which the conductor 2 is wound in 1 turn are arranged alternately, that is, the first section is an integer number of turns, and an example is shown in which the second section has 0.5 turns more than this. However, in the present invention, it is also possible to implement a combination of a first section having an integer number of turns of 2 or more turns and a second section having an integer number of turns of 0.5 turns or more.

The inventor used a bare conducting wire with a wire diameter of 0.1 mm and a wire width of 6 mm.

T-0,4+nm, P=3.1mm, wound in a single layer solenoid shape with 45 turn spaces, inductance L' with 2 integer turns, and 2 with 0.5 turns added to it.
, a capacitor C with a capacitance value of 2.3 pF is connected so that the inductance L of 5 turns is arranged alternately, and an electromagnetic delay line is constructed in which the sections of inductance L and L' are arranged alternately, 10 sections each, for a total of 20 sections. did.

0 In this case, the theoretical value of the coupling coefficient aI = 0.114.

a2 = -0,047, a2' = 0.031, a
3=0.019, the characteristic impedance is 100Ω,
The delay time is 250 per section of inductance L.
ps, the section of inductance L' is 200 per section.
ps.

The delay time for a total of 20 sections was 4.5 ns, and high speed performance was achieved with a rise time of 400 ps.

FIG. 5 shows another embodiment of the electromagnetic delay line of the present invention.

The structure of an inductance element 3 in which a conducting wire 2 is wound around a bobbin 1 is the same as that shown in FIG. And the integer turn 1 turn between A2 point and A3 point is also the same, but the number between A1 point and A2 point is 0.5 turn less than the integer turn.
．． It consists of 5 turns.

An electromagnetic delay line with such a configuration is also represented by the same equivalent circuit as in Fig. 3, and if Fig. 3 is expressed by the same mutual induction between conductors as in Fig. 4, L=Ls... ... (7) L'
=2・Ls−2・Mll ・・・・・・ (8) 1, and only equation (10) of a2 has no positive mutual induction,
Since there is only one negative mutual induction, the number of negative mutual inductions is greater than the number of positive mutual inductions, otherwise the numbers of positive and negative mutual inductions are equal.

Therefore, only the coupling coefficient a2 is negative and the other coupling coefficients a1
+ a2Z a3 is positive. In this case also la2 l
>82', a good coupling coefficient can be easily obtained.

By the way, in the present invention, even if the integer number of turns is 2 turns or more, various combinations 2 can be considered by alternately combining the turns with the number of turns 0.5 turns less than the integer number of turns. In short, the object of the present invention can be achieved by alternately arranging a first section in which the conductor is wound in an integral number of turns and a second section that is different from the first section by 0.5 turns.

In the above embodiments, this is done to facilitate explanation.

W so that the T side can be ignored in the inductance element 3
>>T has been explained, but even if the ratio of W and T is arbitrarily determined, good delay characteristics can be achieved by appropriately selecting the pitch P, the wire diameter of the conductor 2, etc.

Further, the bobbin 1 can be formed in any shape, such as a circular shape or an elliptical shape, instead of a rectangular shape, and the conductor 2 can also be formed into a conductor strip or other shape by etching, in addition to having a circular cross section.

As explained above, the electromagnetic delay line of the present invention has a first section in which a conductor is wound in an integral number of turns, and a 0.0-.
Since the inductance element has second sections which are arranged alternately with five turns and different numbers of positive and negative mutual inductions between the conductors of the first and second sections, the difference between each section of the inductance element is Since it is easy to obtain the optimum coupling coefficient of 3, good delay characteristics can be obtained, and the configuration of the inductance element can be simplified.

[Brief explanation of the drawing]

1 and 2 are a schematic front view and a schematic side view showing one embodiment of the electromagnetic delay line of the present invention, FIG. 3 is an equivalent circuit diagram of the electromagnetic delay line shown in FIG. 1, and FIG. 4 is an equivalent circuit diagram of the electromagnetic delay line shown in FIG. FIG. 5 is a schematic front view showing another embodiment of the electromagnetic delay line of the present invention. 1...Bobbin 2...Conductor 3...Inductance element a1+ a2+
, a2', a3... Coupling coefficient C... Capacitor L, L'... Inductance patent applicant Elmec Corporation 4 O 1 Rin O 2 Reverse O 3 Lower P4 Rin O 5 times 45-

Claims (3)

[Claims] (1) In an electromagnetic delay line comprising an inductance element wound with a conductor and a capacitor connected between the conductor and the ground, and having multiple sections, the inductance element has a first inductance element wound with the conductor wound in an integral number of turns. sections and second sections that differ by 0.5 turns from the first sections are arranged alternately, and the number of positive mutual inductions and negative mutual inductions is determined between the conductors of the first and second sections. An electromagnetic delay line characterized by different characteristics. (2) The electromagnetic delay line according to claim 1, wherein the second section is wound by 0.5 turns more than the first section. (3) The electromagnetic delay line according to claim 1, wherein the second section is wound 0.5 turns less than the first section.