CN112103138A - Radio frequency switch with flexible printed circuit contact strip and manufacturing method thereof - Google Patents

Abstract

The invention discloses a radio frequency switch with a flexible printed circuit contact strip and a manufacturing method thereof, and the radio frequency switch comprises a radio frequency printed circuit board, a ground shielding body and the flexible printed circuit contact strip, wherein the radio frequency printed circuit board is provided with a conductive layer and forms a radio frequency channel with the ground shielding body; when the flexible printed circuit contact strip moves downwards, the lower conductive contact of the flexible printed circuit contact strip is communicated with the radio frequency channel; the radio frequency channel is opened when the flexible printed circuit contact strip moves upward, while the upper conductive contact of the flexible printed circuit contact strip contacts the ground shield. The radio frequency switch with the flexible printed circuit contact strip and the manufacturing method thereof have the advantages that: to achieve the ideal radio frequency quality parameters (such as standing wave, insertion loss, isolation, etc.).

Description

Radio frequency switch with flexible printed circuit contact strip and manufacturing method thereof

Technical Field

The invention relates to a switch or relay with a flexible printed circuit contact strip. More particularly, the present invention relates to radio frequency switches having flexible printed wiring contact strips and methods of making the same.

Background

A radio frequency switch is a special type of electromechanical relay (or switch) in which a Radio Frequency (RF) signal is connected or disconnected between terminals in the switch. Generally, a radio frequency switch pushes a movable conductive sheet into contact with a pair of connector terminals using a push rod, and connects a radio frequency signal path between the two connector terminals. One common design is a switch that uses a seesaw-type soft magnet to swing under the action of a pair of electromagnets to push a push rod. In order to achieve a repeatable and reliable contact between the conductor terminal and the connector terminal, limiting posts are placed on both sides of the conductor terminal to limit lateral movement of the conductor spring. Such a limiting post creates additional friction between the rod and the conductor reed, thereby creating particles that can contaminate the contacts, thereby degrading the reliability of the electromechanical relay (or switch). It would be highly desirable to provide a new spacing means that is easy to manufacture and highly reliable.

Disclosure of Invention

Aiming at the problem that the reliability of the electromechanical relay (or switch) is reduced because particles are generated due to the fact that extra friction is generated between a rod and a conductor reed by a limiting column of the conventional electromechanical relay (or switch), and the particles pollute a contact, the technical problem to be solved by the invention is to provide the radio frequency switch with the flexible printed circuit contact strip.

In order to solve the technical problems, the invention adopts the technical scheme that:

a radio frequency switch with a flexible printed circuit contact strip comprises the flexible printed circuit contact strip and a radio frequency printed circuit board, wherein at least two contacts and a ground shielding wire are arranged on the circuit board, a main body comprises a radio frequency channel and a ground wire, at least one end of the flexible printed circuit contact strip is attached to the main body, and the flexible printed circuit contact strip can move up and down under the action of external force. The flexible printed circuit contact strip moves downwards and simultaneously contacts the connector to be communicated with a radio frequency channel formed by the connector; when the flexible printed circuit contact strip moves upwards, the radio frequency channel formed by the connector is disconnected, and meanwhile, the flexible printed circuit contact strip and a ground shield of the radio frequency channel form good contact, so that ideal radio frequency quality parameters (such as standing waves, insertion loss, isolation and the like) are achieved.

The preferable scheme of the scheme is as follows: also includes a radio frequency printed circuit board.

The preferable scheme of the scheme is as follows: an electromagnetic drive assembly is also included.

The preferable scheme of the scheme is as follows: also comprises a push rod.

Correspondingly, the invention also provides a manufacturing method of the flexible printed circuit contact strip, which comprises the following steps:

a substrate of the flexible printed circuit contact strip is polyimide, an upper conductive contact is arranged on the upper surface of the substrate, a lower conductive contact is arranged on the lower surface of the substrate, and the upper conductive contact and the lower conductive contact are connected through a conductive through hole.

Compared with the prior art, the invention has the following beneficial effects: the switch includes a pair of connectors, a radio frequency printed circuit board, the connectors contacting the conductive layers of the radio frequency printed circuit board, a flexible printed circuit contact strip which moves downwardly so that the conductive contacts thereon contact the conductive layers of the radio frequency printed circuit board to complete the conductive paths of the connectors. The flexible circuit contact strip is moved upward so that its lower conductive contact is separated from the conductive layer of the rf printed circuit board, disconnecting the conductive path of the connector, while the upper conductive contact on the flexible circuit contact strip is in contact with the ground shielding surface to achieve the desired rf quality parameters (e.g., standing waves, insertion loss, isolation, etc.).

Drawings

Fig. 1 is a cross-sectional view of an exemplary embodiment of the radio frequency switch of the present invention having a flexible printed wiring contact strip.

Fig. 2 is a partial perspective view of an exemplary embodiment of the radio frequency switch of the present invention having a flexible printed wiring contact strip.

Fig. 3 is a perspective view of the flexible printed wiring contact strip of the present invention.

Fig. 4 is a cross-sectional view and a perspective view of the radio frequency printed wiring board of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, 2, 3 and 4, the rf switch with the flexible printed circuit contact strip of the present embodiment includes a cavity 130, an rf printed circuit board 120, a flexible printed circuit contact strip 140, conductor cores 111, 112 and 113, push rods 161 and 162, and an electromagnetic driving assembly 150.

The cavity 130 is surrounded by a ground shield 131, which is typically made of a metallic material (e.g., copper, aluminum, etc.) and may be surface coated with a conductive material (e.g., gold, silver, nickel, ternary alloy, etc.).

The radio frequency printed wiring board 120 includes a dielectric substrate 121, as well as upper conductive layers 123A and 123B, lower conductive layers 122A and 122B, a ground shielding surface 125, and a wiring board conductive via 124. The circuit board conductive vias 124 serve to connect the corresponding upper and lower conductive layers or ground shielding surfaces. 122A are connected by way of the board conductive vias 124 and 123A, and 122B are connected by way of the board conductive vias 124 and 123B. The upper and lower conductive layers and the conductive vias are typically formed of copper films. And gold plating is carried out on the surfaces of the upper conductive through hole and the lower conductive through hole to form a good conductive contact.

The flex circuit contact strip 140 includes a flex strip dielectric 141 and upper and lower conductive contacts 143, 142 and conductive vias 144. One end is in a chevron shape having two fixed connection points 145, and the conductive via 144 serves to connect the corresponding upper and lower conductive contacts. The flexible tape media 141 may be formed of polyimide film, the upper and lower conductive contacts are typically made of copper film, and the contact surfaces are gold plated. The conductive vias 144 connect the upper and lower conductive contacts. The flexible line contact strip 140 is supported by a pivot mount 146 at the middle so that both ends can be depressed or raised.

The conductor cores 111A, 111B are made of a conductive metal material (e.g., copper), and the surface is plated with a gold layer to form a good contact state. The upper end of the conductor core 111A is in contact with the lower conductive layer 122A of the radio frequency printed wiring board 120, and the upper end of the conductor core 111B is in contact with the lower conductive layer 122B of the radio frequency printed wiring board 120.

The push rods 161, 162 may be made of any dielectric material.

And the electromagnetic driving assembly 150 comprises electromagnets 151 and 152, an upper soft magnet 153, a lower soft magnet 154, a permanent magnet 155, a soft magnetic seesaw 156 and a pressure spring piece 157.

It will be appreciated that the coaxial radio frequency switch flexible printed circuit contact strip can be manufactured in a variety of ways. A detailed description of various possible manufacturing methods is omitted here for the sake of brevity.

It is understood that many other embodiments and combinations of different material selections and arrangements may be made without departing from the scope of the invention. Also, various topographies and geometries of electromechanical relays can be tailored by varying the layout of the various components.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (9)

1. A radio frequency switch having a flexible printed wiring contact strip, comprising a radio frequency printed wiring board (120), a ground shield (131), and a flexible printed wiring contact strip (140), the radio frequency printed wiring board (120) having a conductive layer and forming a radio frequency channel with the ground shield (131); when the flexible printed circuit contact strip (140) moves downwards, the lower conductive contact (142) of the flexible printed circuit contact strip (140) is communicated with the radio frequency channel; the flexible printed wiring contact strip (140) breaks the radio frequency channel when moved upward, while the upper conductive contact (143) of the flexible printed wiring contact strip (140) contacts the ground shield.

2. The radio frequency switch with the flexible printed circuit contact strip according to claim 1, wherein the ground shield (131) surrounds a cavity (130), and the radio frequency printed circuit board (120) and the flexible printed circuit contact strip (140) are located in the cavity (130).

3. The radio frequency switch with the flexible printed wiring contact strip according to claim 2, wherein the radio frequency printed wiring board (120), comprises a dielectric substrate (121) and upper first (123A) and second (123B) conductive layers, lower first (122A) and second (122B) conductive layers, a ground shielding surface (125), and a board conductive via (124), the lower first conductive layer (122A) is connected to the upper first conductive layer (123A) through the board conductive via (124), and the lower second conductive layer (122B) is connected to the upper second conductive layer (123B) through the board conductive via (124).

4. The radio frequency switch with the flexible printed wiring contact strip according to claim 3, further comprising a first conductor core (111A) and a second conductor core (111B), wherein an upper end of the first conductor core (111A) is in contact with a lower first conductive layer (122A) of the radio frequency printed wiring board (120), and an upper end of the second conductor core (111B) is in contact with a lower second conductive layer (122B) of the radio frequency printed wiring board (120).

5. The radio frequency switch with flexible printed wiring contact strip according to claim 2, characterized in that the flexible wiring contact strip (140) comprises a flexible strip medium (141) and upper (143), lower (142) and conductive vias (144), the conductive vias (144) connecting the corresponding upper and lower (143, 142) conductive contacts.

6. The radio frequency switch with the flexible printed wiring contact strip according to claim 5, wherein the flexible wiring contact strip (140) is supported by a rotation shaft holder (146) at a middle portion so that both ends thereof can be pressed or lifted, and the flexible wiring contact strip (140) has a chevron shape at one end thereof provided with two fixed connection points (145).

7. The radio frequency switch with flexible printed circuit contact strip according to claim 1, characterized in that the electromagnetic drive assembly (150) comprises an electromagnet (151), (152), an upper soft magnet (153), a lower soft magnet (154), a permanent magnet (155), a soft magnetic seesaw (156), a pressure dome (157).

8. The RF switch with FPC contact strip according to claim 7, further comprising a first push rod (161) and a second push rod (162), wherein the first push rod (161) and the second push rod (162) are located below the pressure spring and above and to the left and above to the right of the FPC contact strip (140).

9. A substrate of the flexible printed circuit contact strip is polyimide, an upper conductive contact is arranged on the upper surface of the substrate, a lower conductive contact is arranged on the lower surface of the substrate, and the upper conductive contact and the lower conductive contact are connected through a conductive through hole.

Images