JPS5924110Y2 - High frequency multi-pole changeover switch - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a high-frequency multi-pole changeover switch, and is particularly intended to provide a multi-pole change-over switch that does not disrupt impedance matching.

In order to transmit high frequency signals, it is desirable that the transmission path be matched to a constant characteristic impedance.

It is relatively easy to match the transmission line itself to a certain characteristic impedance using means such as a coaxial cable or a strip line.

However, it is difficult to achieve impedance matching in a high frequency circuit, especially in a multi-pole changeover switch as shown in FIG.

In other words, as a multi-pole changeover switch for high frequency applications, a structure as shown in FIG. 1, for example, has conventionally been used.

Conventionally, reed relays 13, 1b, IC...
1h are commonly connected, terminal 2 is derived from this common connection point, and terminals 3a, 3b, 3C...3h are derived from the other lead wire of each reed relay 1a to 1h. .

Reed relays 1a to 1h are selectively turned on and off by excitation means, and terminals 2 are selectively connected to terminals 3a to 3h so that high frequency signals can be supplied to desired circuits.

The reed relay itself uses a strip-shaped conductor for the lead wires and contacts, and the strip-shaped conductor extends linearly, so
By arranging the band-shaped conductor and the ground conductor with a predetermined spacing between them, the characteristic impedance of the reed relay itself can be matched.

However, if one of the lead wires of a plurality of reed relays 1a to 1h is commonly connected and only one of the plurality of reed relays 1a to 1h is turned on to form a transmission path, the other one is turned off. The reed relay and lead wire in the state are connected to the transmission line, and there is a drawback that the line impedance is disturbed by other lead wires.

The purpose of this invention is to provide a high frequency multipole changeover switch that does not cause disturbances in line impedance.

An embodiment of this invention will be described below in detail with reference to FIGS. 2 and 3.

In FIGS. 2 and 3, reference numeral 4 indicates a metal case having a substantially circular planar shape and having a plurality of cavities 5 radiating from the center of the circle.

The metal case 1 has a plurality of grooves 5a for forming a cavity 5.
, 5b, 5C...5h, and a lid 4b that closes each open surface of the grooves 5a, 5b, 5C...5h.

In other words, this example shows a case where the partition wall 11 is formed by a groove.

The main body 4a has a circular cavity in the center where the grooves 5a to 5h are concentrated, and a common contact 6 is provided in this circular cavity.

As shown in FIG. 3, the common contact 6 is constituted by a disc-shaped conductive plate, is attached to one end of a rod-shaped conductor 8 constituting the connector, and is insulated and supported in the circular cavity.

Fixed conductors 7a, 7b, 7C, . . . , 7h are provided at positions equidistant from the common contact 6 at each end of the grooves 5a to 5h.

These fixed conductors 7a, 7b...7h are also attached to one end of the rod-shaped conductor 9 constituting the connector, and
is insulated and supported at each end of h.

On the other hand, on the lid 4b side, there is a common contact 6 and each fixed conductor 7a, 7b.
. . . Movable contact piece 10 that selectively contacts between 7 hours
Attach a, 10 b, 10 C...10 h.

The movable contact pieces 10a...10h are arranged radially with respect to the surface of the metal plate constituting the lid 4b, and are supported by a drive device 12 at approximately the center thereof.

The drive device 12 includes an insulating rod 13 that passes through a metal plate that constitutes the lid 4b, a flange 14 provided at the end of the insulating rod 13, and a spring 15 inserted between the flange 14 and the surface of the lid 4b. A movable contact piece 10a is attached to the tip of the insulating rod 13.
Install 10h.

When the lid 4b is stacked on the main body 4a, the movable contact piece 10a~
10h is configured to be located approximately at the center of the grooves 5a to 5h formed in the main body 4a, and is movable by pressing the insulating rod 13 against the biasing force of the spring 15 with, for example, a finger or an electromagnetic actuator. The contact pieces 10a to 10h move to approximately the axis position of the cavity 5 as shown in FIG.
, 7b...7h to establish electrical continuity between the common contact 6 and any fixed conductor 7a or 7b...7h.

With such a structure, each movable contact piece 10a~
10h is a common terminal 6 and a fixed conductor 7a as shown in FIG.
~7h, and moves to approximately the axial center position of the cavity 5.

That is, each of the movable contact pieces 10a to 10h is installed at an axial center position of the cavity surrounded by the partition wall 11 of the cavity 5.

As a result, a coaxial line can be constructed by the movable contact pieces 10a to 10h and the cavity 5, so that the movable contact pieces 10a to 10h can form a coaxial line.
The width and thickness of 10h and the width W and height H of the cavity 5 are selected to appropriate values, and the movable contact pieces 10a to 10h and the partition wall 11 are assembled.
A predetermined line impedance can be selected by specifying the dimension between .

Further, by selecting the area of the disc of the common contact 6 and the area of each of the fixed conductors 7a to 7h, the impedance with the metal case 4 can be set to a predetermined impedance.

As explained above, according to this invention, the movable contact piece 10 a
, 10b, 10C..., when any one of them is in contact with the common contact 6 and any of the fixed conductors 7a, 7b, 7C..., the movable contact in that contact state is The strip, for example 10a, can be matched to a predetermined characteristic impedance by the width of the plate and the distance between the metal case 4 and the partition wall 11.

Further, since the common contact 6 and the fixed conductor 7a are also matched to a predetermined characteristic impedance, the characteristic impedance of the switch portion as a whole can be made equal to the external characteristic impedance.

Also, one movable contact piece 10a connects the common contact 6 and the fixed conductor 7.
When in contact with the other movable contact pieces 10b to 10h
is in a non-contact state.

Therefore, other circuit parts can be completely disconnected,
Movable contact piece 10a currently in contact with the lead wire of another circuit
The impedance of the circuit is not disturbed.

As a result, it is possible to obtain a high frequency multi-pole changeover switch without disturbance in impedance.

Further, the fixed contacts 7a, 7b, 7C... and the movable contacts 10a, 10b, IOC... are housed in the grooves 5a to 5h, and the partition walls 11 of the grooves 5a to 5h are Since the shielding structure is adopted, signals do not leak to each circuit, and a high frequency multi-pole changeover switch with less crosstalk can be obtained.

Therefore, it is particularly effective when used in high frequency measuring instruments.

[Brief explanation of drawings]

Fig. 1 is a connection diagram for explaining a conventional high-frequency multi-pole changeover switch, Fig. 2 is a cross-sectional view taken along the line A-A in Fig. 3 showing an embodiment of this invention, and Fig. 3 is a sectional view of this invention. FIG. 4 is a sectional view taken along the line B--B shown in FIG. 3. FIG. 4: Metal case, 5: Cavity, 5a to 5h: Groove, 6: Common contact, 7 a, 7 b, 7 C--: Fixed conductor, 10 a, 10 b, IOC... : Movable contact piece, 11: Partition wall, 12: Drive device.

Claims (1)

[Scope of utility model registration request] A metal case with a flat empty space, a common contact supported insulated at the center of the metal case with a predetermined impedance matching, and each arranged at approximately the same distance from the common contact. a plurality of fixed conductors supported with predetermined impedance matching, a movable contact piece that electrically opens and closes between the common contact and the fixed conductor, and a movable contact piece that connects the movable contact piece to the common contact and the fixed conductor and a partition wall provided at a predetermined distance along both sides of the movable contact piece and electrically connected to the metal case. A multi-pole switch for high frequency.