JPS61154210A - Distribution constant type electromagnetic delay line - Google Patents

Abstract

PURPOSE:To improve an output waveform, especially its leading waveform by arranging an earth electrode so as to be opposed to a part of a conductor line of each turn. CONSTITUTION:A conductor line 6 formed by applying space winding to a conductor in a form of single layer and the earthing electrode 1 opposed to the conductor line 6 via a dielectric 2 are provided. Then the said earthing electrode 1 is arranged so as to be opposed to a part of the conductor line 6 of each turn. For example, the earthing electrode 1 placed at the inner side of the conductor line 6 wound in flat is arranged while being biased to one side of the bobbin 3 in the broadwise direction W so that the unit conductor line 5 of each turn is not opposed to the grounding to the grounding electrode 1 at a part before and after a connection section &. Thus, a part of a nearly inductance L only is formed on the way of the conductor line, and the output waveform, especially the leading waveform is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a distributed constant electromagnetic delay line that handles ultrahigh-speed signals with rise times of 1 ns or less, for example.

In particular, the present invention relates to an improvement in a distributed constant electromagnetic delay line using an impedance line in which the conducting line faces a ground electrode via a dielectric.

[Conventional technology]

This type of distributed constant electromagnetic delay line is constructed by covering the outer periphery of a long and thin plate-shaped ground electrode with a dielectric material to form a flat and long bobbin, and then winding a conductor around the outer periphery of this bobbin in the form of a single-layer solenoid. There is a configuration in which a conductive path is formed and this conductive path is opposed to the ground electrode.

Such a distributed constant type electromagnetic delay line can easily obtain good delay characteristics for ultrahigh-speed signals, but the present invention is a further improvement on this.

[Problem that the invention seeks to solve]

The present invention has been made under these circumstances, and is intended to provide a distributed constant electromagnetic delay line with improved output waveforms, especially rising waveforms.

[Means for solving problems]

The present invention aims to solve these problems.

This is a distributed constant electromagnetic delay line in which a conductor is space-wound in the form of a single-layer solenoid, and a ground electrode is opposed to it via a dielectric.

It is arranged so as to face a part of the conductive path of each turn.

[For production]

In the present invention equipped with such a means, in each turn of the conductive line space-wound in the form of a single-layer solenoid, the ground electrode has a portion that does not face the conductive line, and in that part, there is a gap between the ground electrode and the conductive line. capacitance decreases, and a portion with relatively large inductance is formed in the middle of the conductor line.

〔Example〕

The present invention will be explained in detail below.

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

The outer periphery of the elongated plate-shaped ground electrode 1 is covered with a dielectric material 2 such as fluororesin, and a flat and elongated bobbin 3 is formed.

On the outer periphery of the bobbin 3, a plurality of rectangular unit conducting lines 5 having a length of one pitch and a bent part 4 in the middle are crimped in parallel so as to cross the axial direction C-C of the bobbin 3.
The unit conductive lines 5 are connected in series in order to form a flat conductive line 6 space-wound in the shape of a single-layer solenoid.

In addition, the code|symbol 7 is a connection part of each of those unit conducting lines 5.

In the distributed constant type electromagnetic delay line of the present invention, the ground electrode 1 located inside the flatly wound conductive line 6 is placed to one side of the hobbin 3 in the +IIIiiiw direction. That is, as shown in FIG. 2, the ground electrode 1 is arranged closer to the bending part 8 of the unit conducting line 5 on the opposite side (upper side in the figure) from the connecting part 7, and one end of the ground electrode 1 ( Distance M between the upper end in the figure) and the inner side of the bent part 8
than B.

Distance between the other end of the ground electrode 1 (lower end in the figure) and the inner part of the connection part 7!
1iftD is increasing. Therefore, in the unit 4 threads 5 of each of the 5 turns, the portions before and after the connection portion 7 are configured not to face the ground electrode 1.

The distributed constant electromagnetic delay line of the present invention is as follows.

When the ground electrode 1 is brought closer to the bending part 8 side of the unit conducting line 5 and the connecting part 7 side of the unit conducting line 5 is left open, the third
As shown by the solid line in the figure, the output pulse signal rises rapidly at a predetermined slope until it reaches 100% of the output amplitude.
Garu.

The following may be considered as the reason why such an effect is obtained.

That is, since the conductive line 6 has a portion that does not face the ground electrode 1 in each turn, as shown in the equivalent circuit of FIG.
The microstrip line DI having a capacitance relative to the ground electrode 1 is connected in series with an inductance I7 which does not face the ground electrode 1 and has almost no capacitance relative to the ground electrode 1.

The unit conductive lines 5 of each turn are adjacent unit conductive lines 5.1 unit conductive lines 5. . . . nth unit conducting line 5. There is a mutual induction of M, , M2, . . . MTl between them, and each turn has a microstrip line D
Since the portion L is larger than the portion of the inductance I7, it is considered that mutual induction is formed between each microstrip line DI-, and the portion of the inductance L can be ignored. However, if the inductance L is large, it may be included in the microstrip line DL.

Note that the mutual induction in FIG. 4 shows only the one formed between the leftmost microstrip line DL and the microstrip line DL on the right side, but there is also mutual induction to the left. , each microstrip line D L
are similarly connected to the left and right microstrip lines DL.

Here, the case where the distributed constant type electromagnetic delay line consists of only the microstrip line DL without the inductance I, and
Microstrip line DL and inductance ■
Considering the electrical characteristics of each of the cases consisting of 7,
The result is as shown in FIG.

In other words, the relationship between the output amplitude (■) and the two frequencies (f) is as follows:
As shown by the broken line in the figure, the output amplitude V decreases with a gentle slope as the frequency f increases.

On the other hand, in a distributed constant electromagnetic delay line that also includes an inductance, the output amplitude V is flat up to a certain frequency, and decreases relatively rapidly (becomes positive) at frequencies above that.

6. In this case, when focusing on the cutoff frequency, the frequency is higher for the characteristic indicated by the broken line. However, the cutoff frequency does not need to be higher than the passband that requires the rise time of the input pulse signal.5In fact, it is better to have a flat amplitude characteristic in the range that requires the rise time of the input pulse signal. The waveform of the output pulse signal becomes good.

Therefore, if the cutoff frequency is within the range required by the rise time of the input pulse signal, the conductor line 6 is formed from the microstrip line D L section and the inductance L section, so that the rising waveform of the output pulse signal is It becomes possible to improve the

In the distributed constant type electromagnetic delay line of the present invention, the ratios of the dimensions B and D to the width W of the two bobbins 3 vary considerably depending on their values. The inventor has determined that the thickness is 2, for example, 0. Q7mm, width 0
．． Pinch the 2mm conductor to the bobbin 3 with width W-5mm.
．． An experiment was conducted by fabricating a distributed constant electromagnetic delay line having a delay time of 2 ns and a characteristic impedance of 100 Ω with a configuration similar to that shown in FIG.

Then, by increasing the width W by 1 dimension by about 5% compared to 13, the rise of the output amplitude V is improved by about 8%, and as shown by the solid line in FIG.
I was able to quickly bring it up to 0%.

Further, although an extremely fast rise time of 20 Qps was obtained for the output pulse signal, the slope of the rise portion was almost the same for both cases, and the output waveform was improved in the present invention.

On the other hand, when the bobbin 30 width direction WT: B=D, and the number of turns of the conductive path 6 is, for example, 30 turns or more, the rising waveform of the output pulse signal is as shown by the broken line in FIG. It tends to rise slightly below 100% and then gradually reach 100%. This tendency becomes even stronger when the number of turns in the conductive line 6 is increased to increase the delay time, which is not preferable.

The distributed constant electromagnetic delay line of the present invention is not limited to the case where the ground electrode is placed close to the bent portion 8 side of the conductive line 6.
D<B may be set closer to the connecting portion 7 side of the unit conductive line 5.

The ratio of the dimensions B and D to the width W of the bobbin 3, that is, the ratio at which the ground electrode 1 is moved to one side is as follows.

The optimum value may be selected depending on the configuration of the distributed constant electromagnetic delay line and the desired characteristics.

Alternatively, as shown in FIG. 6, the center portion of the bobbin 3 in the width W direction may be removed and the two ground electrodes 9a and 9b may be arranged along the longitudinal direction so as to face each other.

Although the distributed constant type electromagnetic delay line having this configuration tends to have a slight increase in preshoot, it is possible to achieve the objects of the present invention.

Furthermore, as shown in FIG. 7, the distributed constant electromagnetic delay line of the present invention has a single-layer solenoid-shaped conducting path 6 as shown in FIG. A configuration is also possible in which the outer periphery is covered with a dielectric 11 and the ground electrode 12 is covered so as to face the conducting path 6 except for the portions before and after the connecting portion 7 .

In the distributed constant electromagnetic delay line of the present invention, the conductive line 13
In order to adjust the characteristic impedance of 6)8.

In particular, in order to increase the characteristic impedance, it is also possible to form a large number of thin slits 14 distributed in the ground electrode 1, as shown in FIG. Here, the conducting path 13 is formed by winding a continuous conductor into a single-layer solenoid shape.

In the distributed constant electromagnetic delay line with this configuration, the slit 14
The intended effects of the distance portion of the present invention shown in FIG. 1 are different.

〔Effect of the invention〕

As explained above, the distributed constant electromagnetic delay line of the present invention is
Since the ground electrode is arranged so as to face a part of the conductive line of each turn, a part with almost no inductance is formed in the middle of the four lines, and the output waveform, especially the rising waveform, is improved.

[Brief explanation of drawings]

1 and 2 are front and side views showing one embodiment of the distributed constant electromagnetic delay line of the present invention, and FIG. 3 is a front view and a side view showing an embodiment of the distributed constant electromagnetic delay line shown in FIG. A rising waveform diagram of a distributed constant type electromagnetic delay line (not shown),
Figure 4 shows the equivalent circuit diagram of Figure 1 - 10 = distributed constant type electromagnetic delay line, and Figure 5 shows the relationship between the output amplitude and the frequency in the distributed constant type electromagnetic delay line that is used as a reference for Figure 1 and the present invention. FIGS. 6 to 8 are a side view and a front view showing other embodiments of the present invention. 1.9a, 9b, 12...Ground electrode 2.11...Dielectric 3.10...Hobbin 5...Unit conductor Route 6.13...Conductor line 7...Connection section 8...Bend section 14...
......Slit OL......Microstrip line 15......Inductance patent applicant Elmec Corporation 13: Conductor (1 path 2 good)

Claims (1)

[Scope of Claims] A distributed constant electromagnetic delay line comprising: a conducting line in which a conductor is space-wound in the form of a single-layer solenoid; and a grounding electrode opposed to the conducting line via a dielectric. A distributed constant electromagnetic delay line characterized in that a ground electrode is arranged to face a part of the conductive line of each turn.