JPH02253532A - High frequency relay - Google Patents

Abstract

PURPOSE:To improve an insertion loss and a return loss by setting the distance between one side wall and an installation surface to be smaller than the distance between the other side wall on the contact spring side and the installation surface for both side walls parallel to the contact springs of a shield part. CONSTITUTION:A distance lb between one side wall and an installation surface for contact pins 1a, 1b, 1c is set smaller than a distance la between the other side wall on the side of contact springs 2a, 2b of a shield part 4 and the installation surface so as to make a space sectional area D2. Space sectional area D2:D1 becomes 1:4.2 by this, and an impedance Z0 at a contact part 3 can be close to the impedance of a coaxial cable for signal input and output. Matching with relation to high frequency can thus be improved, thereby an insertion loss and return loss can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a high frequency relay that switches high frequency signals.

[Prior Art] Conventionally, this type of high-frequency relay for switching high-frequency signals has at least one pair of contact pins la, lb, and lc standing upright, as shown in FIGS. 4 and 5. a plate-shaped contact spring 2a driven by an electromagnet (not shown) in a direction perpendicular to the erected surfaces of la, lb, lb, and lc;
Two sets of contact portions 3 are provided in which both contact pins la, lb, lb, and lc can be freely short-circuited at 2b, and the contact portions 3 are housed within a shield portion 4. Here, in the above-mentioned conventional example, the distances la and fb between both side walls of the shield part 4 parallel to the contact springs 2a and 2b and the standing surface were equal. That is, both side walls of the shield portion 4 were arranged symmetrically with respect to the upright surfaces of the contact pins la, lb, and lc. Here, the shield part 4 has a bottom body 4a made of a metal body on which contact pins la, lb, and lc are insulated by an insulator 10, and a shield hole 11 in which the contact part 3 is housed is bored. Side body 4b made of a metal body
The contact spring 2a of the shield hole 11,
A contact spring 2a is provided on the side wall on the 2b side.

A ground terminal 12 that comes into elastic contact with 2b is provided.

Note that the bottom body 4a and the side body 4b may be formed into a negative body.

[Problems to be Solved by the Invention] However, as described above, the contact spring 2a of the shield portion 4 is formed so as to surround the contact portion 3.

Since both side walls parallel to 2b were provided symmetrically (equidistantly) with respect to the contact pins la, lb, and lc, 1 to 5 GH input and output using coaxial cables (e.g., 50 Ω)
When switching a high frequency signal of about z, the high frequency matching is significantly deviated, the insertion loss and return loss become as shown in FIG. 6, and there is a problem that predetermined high frequency characteristics cannot be satisfied.

However, the impedance Z0 of the contact part 3 of the high frequency relay
is the cross-sectional area of the contact springs 2a and 2b, and the shield part 4 is
If the spatial cross-sectional area of is Dl and the permittivity of air is ε, then Zo= <138/It) log (D*/D+)
−・=(1), and in order to obtain an input/output impedance of 50Ω, D, :D, is preferably 1:2.3, but in the conventional example, it is 1:5.5, which is There was a problem in that the matching was significantly off.

The present invention has been made in view of the above points, and an object thereof is to provide a high frequency relay that can improve insertion loss and return loss and obtain predetermined high frequency characteristics.

[Means for Solving the Problems] The high frequency relay of the present invention has at least one pair of contact pins erected, and a plate-shaped relay driven by an electromagnet in a direction perpendicular to the erected surface of the pair of contact pins. In a high-frequency relay that is equipped with a contact part that can freely short-circuit both contact pins using a contact spring, and in which the contact part is housed in a shield part, one of the two walls of the shield part parallel to the contact spring on the contact spring side. The distance between the other side wall and the erected surface is smaller than the distance between the other side wall and the erected surface.

[Function] The present invention is configured as described above, and short-circuits between both contact pins using a plate-shaped contact spring driven by an electromagnet in a direction perpendicular to the upright surfaces of the pair of contact pins. In a high frequency relay similar to the conventional example, which is equipped with a flexible contact part and the contact part is housed in a shield part, the contact part is installed upright on one side wall on the contact spring side of the both walls parallel to the contact spring of the shield part. To provide a high frequency relay in which insertion loss and return loss can be improved and predetermined high frequency characteristics can be obtained by making the distance between the other side wall and the erected surface smaller than the distance between the other side wall and the erected surface. is now possible.

[Embodiment] FIG. 1 shows an embodiment of the present invention, in which in a high frequency relay similar to the conventional example, the contact between the two side walls parallel to the contact springs 2a and 2b of the shield part 4 surrounding the contact part 3 is shown. Spring 2
The distance 1b between the other side wall and the erected surface is smaller than the distance la between one of the side walls a and 2b and the erected surface.

The operation of the embodiment will be described below. In the present embodiment, the contact spring 2a of the shield portion 4.

By making the distance 1b between the other side wall and the erected surface smaller than the distance 1a between the side wall of the 2b side and the erected surface of the contact pins la, lb, and lc, the spatial cross-sectional area is made smaller. As a result, the spatial cross-sectional area D=:D becomes 1:4°2, and the impedance Z of the contact part 3 can be brought close to the impedance of the coaxial cable for signal input/output, improving high-frequency matching. As shown in FIG. 3, insertion loss and return loss can be improved, and predetermined high frequency characteristics can be obtained. Note that the cross-sectional area D1 of the contact springs 2a and 2b is designed taking into account the drive characteristics of the electromagnet, and the distance la is designed taking into account switch characteristics such as signal voltage and signal frequency.
In the example, without changing both of the above characteristics,
The high frequency characteristics are improved by reducing the spatial cross section M Dl.

[Effects of the Invention] The present invention is configured as described above, and a plate-shaped contact spring driven by an electromagnet in a direction perpendicular to the upright surfaces of the pair of contact pins connects both contact pins. In a high frequency relay similar to the conventional example, which is equipped with a contact section that can be short-circuited and the contact section is housed in a shield section, one side wall on the contact spring side of both side walls parallel to the contact spring of the shield section and Since the distance between the other side wall and the upright surface is smaller than the distance between the other side wall and the upright surface, insertion loss and return loss can be improved to provide a high frequency relay that can obtain the desired high frequency characteristics. The effect is that it can be done.

[Brief explanation of drawings]

Fig. 1 is a top view of the main parts of an embodiment of the present invention, Fig. 2 is a sectional view of the main parts of the same as above, Fig. 3 is an explanatory diagram of the same as above, Fig. 4 is a top view of main parts of the conventional example, The figure is a sectional view of the main part of the same as above, and FIG. 6 is an explanatory diagram of the same as above. la, lb, lc are contact pins, 2a, 2b are contact springs,
3 is a contact portion, and 4 is a shield portion. Agent Patent Attorney Ishi 1) Chief Figure 7 4

Claims (1)

[Claims] (1) A contact in which at least one pair of contact pins is installed upright, and a plate-shaped contact spring driven by an electromagnet in a direction perpendicular to the upright surface of the pair of contact pins allows short-circuiting between both contact pins. In the high-frequency relay, the contact part is housed in the shield part, and the distance between one of the side walls on the contact spring side of the shield part parallel to the contact spring and the standing surface is A high-frequency relay characterized by reducing the distance between the other side wall and the standing surface.