JPH0230913Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an ultrahigh-speed delay line device, and particularly to an improvement in a delay line device that can obtain a desired delay time with high accuracy.

[Prior art and its problems]

Conventionally, this type of delay line device has a conductor space-wound in a single layer solenoid shape to form an inductance element, a capacitor connected between each turn of this inductance element and the ground, and these inductance elements and capacitors In addition to storing it in a case with input and output terminals,
The end of the inductance element is connected to an input/output terminal.

In the case of such a delay line device, the delay time is the delay time td for one section multiplied by the number of sections, and the delay due to the inductance and stray capacitance of the input/output terminals and the lead wires connecting these input/output terminals and the inductance element. The total delay time is the total delay time.

In order to obtain a desired delay time, the number of sections is selected so that the delay time is somewhat larger than the target delay time, and then the number of sections is reduced to get closer to the target delay time.

However, in the conventional delay line device configured in this way, when the delay time is reduced by reducing the number of sections, the total delay time changes by the delay time td of one section, so the target delay time is There is a drawback that a large error is likely to occur between the two, and the error is about ±td/2 at maximum.

[Purpose of invention]

The present invention was made in order to solve these conventional drawbacks, and aims to provide a compact delay line device that can easily obtain the desired delay time with extremely high accuracy and has a simple configuration. purpose.

[Structure and effect of the idea]

In order to achieve this purpose, the present invention provides a delay line with a fixed main delay time, and a delay time with a delay time that is smaller than the delay time of the delay line and that is smaller than the delay time of the delay line. delay lines are connected in cascade, and the signal passing length of the delay line to the connection point with the delay line can be changed.

According to this configuration, since the signal passing length between the connection point piece in the delay line and the signal input/output point can be changed, even if the delay line can only change by the delay time td of one section. The delay line allows the delay time to be changed continuously, making it possible to obtain the desired delay time with high accuracy.

Moreover, since the means for continuously changing the delay time using a delay line can be easily achieved by changing the connection point with the delay line or partially short-circuiting the delay line, adjustment is also possible. It's easy.

[Example of idea]

The details of the present invention will be explained below.

FIG. 1 is a perspective view of essential parts showing an embodiment of the delay line device of the present invention.

In the figure, a ground terminal 2 hangs integrally and bent from the end of a substrate 1 which also serves as a ground electrode, and a capacitor 3 is connected to the main surface of this substrate 1.

This capacitor 3 has a ground electrode 5 formed on one main surface of a dielectric plate 4, and a plurality of capacitance electrodes 6 formed at a predetermined pitch on the opposite main surface.
A ground electrode 5 is connected to the substrate 1 by soldering so as to be in contact with the substrate 1.

An inductance element 7 is soldered to the capacitive electrode 6 of the capacitor 3. The inductance element 7 is formed by winding a conductor 9 in a single-layer solenoid shape at a predetermined pitch on the outer peripheral surface of a flat and elongated bobbin 8 made of a ceramic material, and has a narrow bobbin 8 extending in the longitudinal direction. The conductor 9 on the end face is connected to the capacitor electrode 6 of the capacitor 3 by soldering and supported. Therefore, conductor 9
The pitch is the same as that of the capacitive electrode 6.

The conductor 9 of this inductance element 7 is
It is formed by a conventionally known method such as winding it around the bobbin 8 in the form of a single-layer solenoid, or photo etching a bobbin having a conductive film formed on its outer peripheral surface.

1 in this inductance element 7
A main delay line 10 of lumped constant type with a capacitor 3 connected between the conductor 9 and the substrate 1 for each turn.
is configured.

A microstrip line 11 as a delay line is attached to the main surface of the substrate 1 along the delay line 10.

This microstrip line 11 has a ground electrode 13 on one main surface of a flat and elongated dielectric plate 12.
, and a microstrip conductive wire 14 is formed on the opposing main surfaces, and a connection electrode 15 as an input/output point is formed at one end of the microstrip conductor 14.

Note that the ground electrode 13 is not formed on the surface of the dielectric plate 12 that faces the connection electrode 15, and an input terminal 16 similar to the ground terminal 2 is connected to this connection electrode 15, which is bent and hangs down. are doing.

Capacitive electrode 6 of capacitor 3 in delay line 10
A connecting piece 17 extends from one of the microstrip lines (the left end in the figure) and is connected to the microstrip conductive wire 14 of the microstrip line 11 by soldering.

By appropriately selecting the length of the connecting piece 17, it can be connected to any location of the microstrip conducting wire 14 on the microstrip line 11.

Note that FIG. 4 is an equivalent circuit diagram of the delay line device shown in FIG. 1.

The delay line device of the present invention configured in this way is
When a signal is applied between the input terminal 16 and the ground terminal 2, the signal passes from the connection electrode 15 of the microstrip line 11 to the microstrip conductor 14, and the connection between the connecting piece 17 and the microstrip conductor 14 is established. The signal is applied from the point to the delay line 10 via the connection piece 17, and is output from the delay line 10 with a delay time equal to the delay time td of one section multiplied by the number of sections.

In this case, the input signal passes through the delay line 11 in the microstrip line 11 with a delay time corresponding to the signal passage length from the connection electrode 15 to the connection point between the microstrip conductor 14 and the connection piece 17.
added to.

Therefore, even if the delay time can only be adjusted by the delay time td for one section in the delay line 10,
If the solder at the connection point between the microstrip conductive wire 14 and the connection piece 17 on the microstrip line 11 is melted and the soldered point is moved, the delay time on the microstrip line 11 can be adjusted continuously. This makes it possible to make fine adjustments easily and to obtain the desired delay time with high accuracy.

In the embodiment shown in FIG. 1, after the connection point between the microstrip conductor 14 and the connection piece 17 in the microstrip line 11 is set,
Mismatching can be prevented by cutting from the part indicated by line A in FIG. 1. However, it is not necessarily necessary to cut it if some degree of mismunching is not a problem.

Furthermore, the microstrip conducting wire 14 in the microstrip line 11 does not have to be formed in a straight line, but can also be formed in a zigzag shape or in a bent manner, as shown in FIGS. 2a and 2b. be. If the microstrip conductive wire 14 is formed in a zigzag or bent manner as described above, the length of the microstrip conductor 14 can be increased, so that the adjustment range of the delay time can be expanded.

FIG. 3 is a perspective view of essential parts showing another embodiment of the delay line device of the present invention.

In this embodiment, a microstrip conductor 18 formed on a dielectric plate 12 is formed as a microstrip line 11 so as to be folded back, and the tip of the microstrip conductor 18 and a delay line 10 are connected. At the same time, the folded microstrip conductive wire 18 is short-circuited by a short-circuiting piece 19, and this short-circuiting piece 19 is configured to be movable while short-circuiting the microstrip conductive wire 18.

As described above, the present invention is not limited to changing the connection point between the connection piece 17 and the microstrip conductor 14 as in the embodiment shown in FIG. By keeping the connection point with the microstrip line 11 fixed and moving the shorting piece 19, it is possible to change the delay time in the microstrip line 11.

In short, the object of the present invention can be achieved if the microstrip line 11 as a delay line is configured so that the signal passage length up to the connection point with the delay line can be changed.

It goes without saying that the embodiment shown in FIG. 3 can also be formed in a zigzag shape or bent as shown in FIG. By doing so, it is also possible to prevent mismatching from occurring.

Furthermore, in implementing the present invention, the delay line 1
In addition to the case where the microstrip line 11 is connected in cascade to the input side of the delay line 10, it is also possible to connect the microstrip line 11 in cascade to the output side of the delay line 10. 11
Even in this case, the delay line can be configured with a delay line that can be easily connected to the delay line 10 and whose signal passage length can be adjusted.

The delay line 10 is not limited to the above embodiment.

As explained above, in the delay line device of the present invention, a delay line having a fixed main delay time is continuously connected to a delay line having a delay time smaller than the delay time of this delay line. Since the passage length to the connection point is configured to be variable,
The desired delay time can be obtained with high accuracy, and the adjustment and configuration are simple and compact.

[Brief explanation of drawings]

FIG. 1 is a perspective view of essential parts showing one embodiment of the delay line device of the present invention, FIG. 2 is a schematic diagram showing another embodiment of the delay line shown in FIG. 1, and FIG. FIG. 4 is an equivalent circuit diagram of FIG. 1. 1... Board, 2... Earth terminal, 3... Capacitor, 6... Capacitive electrode, 7... Inductance element, 8... Bobbin, 9 Conductor, 10... Delay line, 1
1...Delay line (microstrip line), 1
4, 18...Microstrip conductor, 16...
Input terminal, 17... Connection piece, 19... Short circuit member (short circuit piece).

Claims (1)

[Claims for Utility Model Registration] (1) A delay line having a fixed main delay time, and a delay time that is smaller than the delay time of the delay line and that is dependent on the length of the conductor line. A delay line device comprising: a delay line for fine adjustment connected in cascade to a delay line; and a signal passing length in the delay line up to a connection point with the delay line can be changed. . (2) The delay line device according to claim 1, which is configured so that the signal passage length can be changed by moving the connection point with the delay line. (3) Utility model registration claim 1, in which a delay line is formed by folding back, and the signal passing length can be changed by moving a short-circuiting member that short-circuits the folded delay line. Delay line device as described in section.