WO2022056680A1

WO2022056680A1 - Radio frequency chip having pressure balance pin short-circuit line

Info

Publication number: WO2022056680A1
Application number: PCT/CN2020/115362
Authority: WO
Inventors: 焦林
Original assignee: 焦林
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2022-03-24

Abstract

A radio frequency chip (1) that has a pressure balance pin short-circuit line (13), wherein the bottom part of the radio frequency chip (1) is provided with a lead pin (11) and pressure balance pins (12), the short-circuit line (13) is provided between the pressure balance pins (12), and the short-circuit line (13) is smaller than the height of the lead pin (11). When a radio frequency antenna that has an inner loop antenna (2) and an outer loop antenna (3) that are connected in series is made, the inner loop antenna (2) and the outer loop antenna (3) are connected by means of the lead pin (11), the pressure balance pins (12) and the short-circuit line (13), instead of by means of being connected by means of a slender connecting line, so that the inner loop antenna (2) and the outer loop antenna (3) are separated into two independent aluminum foil antennas. The design of the radio frequency chip (1) simplifies the fabrication process and reduces the production waste rate, while performing on-line measurement of the contact resistance of the radio frequency chip (1) and the aluminum foil antennas when same are packaged and fixed, monitoring the packaging process, and improving the packaging quality.

Description

A radio frequency chip with pressure-balanced pin short circuit

technical field

The utility model relates to the technical field of radio frequency, and more particularly, to a radio frequency chip with a pressure-balanced column foot short-circuit line.

Background technique

A radio frequency chip refers to an electronic component that converts radio signal communication into a certain radio signal waveform and sends it out through antenna resonance. It is regarded as one of the core components of radio frequency technology and is widely used in various industries.

The bottom of the traditional radio frequency chip is provided with a pressure balance pin, which has nothing to do with the chip circuit. When used for chip packaging, the pressure balance pin supports the chip and maintains the balance of the chip together with the lead pin. The traditional RF chip pin layout has the following defects:

1. When making a two-ring aluminum foil RF antenna with inner and outer double loops, in order to connect the inner loop antenna to the outer loop antenna and also connect the lead pins of the RF chip, it is necessary to make a very thin aluminum foil line between the chip pins As the connecting line between the inner loop antenna and the outer loop antenna, the inner loop antenna and the outer loop antenna are usually made integrally. Due to the complex process of the aluminum foil line, it is easy to increase the scrap rate of the aluminum foil antenna during the production process, which affects the production efficiency and production quantity. .

2. During packaging, the contact resistance on-line measurement cannot be performed on the bottom pin layout. Since the RF chip is fixed on the RF antenna by flip-packaging with thermally cured anisotropic conductive resin, the coating amount of the anisotropic conductive resin, packaging pressure, The packaging temperature and the cleanliness of the surface of the aluminum foil antenna will affect the contact resistance between the lead pins and the aluminum foil antenna. Failure to measure the contact resistance will make it difficult to monitor the packaging quality and affect production efficiency.

The above is insufficient and needs to be improved.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, the present invention provides a radio frequency chip with a pressure-balanced pin short circuit.

The technical scheme of the present utility model is as follows:

A radio frequency chip with a pressure balance column foot short circuit, the bottom of the radio frequency chip is provided with a lead column foot and a pressure balance column foot, a short circuit line is arranged between the pressure balance column foot, and the thickness of the short circuit line is smaller than the lead column foot the height of.

In the above-mentioned radio frequency chip with pressure-balanced short-circuit lines, the short-circuit lines are conductive lines made of silver or gold.

In the above-mentioned radio frequency chip with pressure-balanced short-circuit lines, the thickness of the short-circuit lines is less than 2 microns.

In the above-mentioned radio frequency chip with short-circuit lines of pressure balance pins, the lead pins and the pressure balance pins are symmetrically distributed in the center.

The above-mentioned radio frequency chip with a pressure balance column foot short circuit, the pressure balance column foot includes a first pressure balance column foot and a second pressure balance column foot, the first pressure balance column foot and the second pressure balance column foot The balance pins are connected through the short-circuit line.

In the above-mentioned radio frequency chip with short-circuiting lines of pressure balance pins, the number of the lead pins and the pressure balance pins are both two, and the lead pins are respectively arranged at the opposite corners of the bottom of the radio frequency chip. , the pressure balance pillars are respectively arranged at the other two diagonal corners of the bottom of the radio frequency chip.

According to the utility model of the above scheme, the beneficial effect is that the utility model adds a short-circuit line between the pressure balancing legs, and when making a radio frequency antenna with inner and outer loop antennas connected in series, the lead legs pass through the pressure balancing legs and the short circuit. Route connection, instead of connecting through slender inner and outer coil connecting lines, simplifies the production process, greatly reduces the production scrap rate, and is conducive to the promotion of miniature RF sensors with two-circle RF antennas, and at the same time, it can measure the RF chip and the aluminum foil antenna package online. Contact resistance when fixed, monitor the chip packaging process, and improve the quality of chip packaging.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present utility model. For some new embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic structural diagram 1 of the present utility model.

FIG. 2 is a second structural schematic diagram of the utility model.

FIG. 3 is a schematic diagram of the connection structure between the utility model and the aluminum foil antenna.

FIG. 4 is a schematic diagram of the structure of adding a contact resistance aluminum foil measuring disc when the RF chip is packaged.

Among them, each reference sign in the figure:

1. RF chip; 11. Lead pin; 111. First lead pin; 112. Second lead pin; 12. Pressure balance pin; 121. First pressure balance pin; 122. Second pressure balance pin feet; 13. Short circuit;

2. Inner loop antenna;

3. Outer loop antenna;

4. Contact resistance aluminum foil measuring disc.

detailed description

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

It should be noted that when a component is referred to as being "fixed" or "disposed" or "connected" to another component, it can be directly or indirectly located on the other component. The positions or positions indicated by the terms "inside", "outside", etc. are based on the positions or positions shown in the drawings, which are only for the convenience of description and should not be construed as a limitation on the technical solution. The terms "first", "second", etc. are only used for the purpose of description, and should not be construed as indicating or implying relative importance or implying indicating the number of technical features.

A radio frequency chip with a pressure balance column foot short circuit, as shown in FIG. 1 , the bottom of the radio frequency chip 1 is provided with a lead column foot 11 and a pressure balance column foot 12, and a short circuit 13 is arranged between the pressure balance column foot 12, and the short circuit 13 The thickness is smaller than the height of the lead pins 11 .

As shown in FIG. 1 , the pressure balance column foot 12 includes a first pressure balance column foot 121 and a second pressure balance column foot 122 . The first pressure balance column foot 121 and the second pressure balance column foot 122 are connected by a short-circuit line 13 . or short-circuit connection. The lead pin 11 includes a first lead pin 111 and a second lead pin 112 . The first pressure balance pins 121 and the second pressure balance pins 122 are arranged diagonally, and the first lead pins 111 and the second lead pins 112 are arranged diagonally.

In one embodiment, the four pillars are symmetrically arranged at the four corners of the bottom of the chip to obtain a more stable equilibrium state.

As shown in FIG. 2 , the lead pins 11 are hemispherical, and the lead pins 11 are connected to the aluminum foil antenna. The pressure balance column foot 12 is conical or hemispherical, and is in contact with the short-circuit line 13, and forms a balanced state at the bottom of the radio frequency chip 1, and plays the role of supporting and balancing the radio frequency chip 1.

Preferably, the short-circuit line 13 is a conductive line made of silver or gold.

As shown in FIG. 3 , when making a radio frequency antenna with inner and outer loop antennas connected in series, after the radio frequency chip 1 and the aluminum foil antenna are packaged, the lead pins on the radio frequency chip 1 are connected to the aluminum foil antenna. The first lead pin 111 is connected with the first pressure balance pin 121 through the aluminum foil antenna to form a passage of the inner loop antenna 2 , the first lead pin 111 is the starting end of the inner loop antenna 2 , and the first pressure balance pin 121 is The terminal of the inner loop antenna 2. The first pressure balance column 121 is connected to the second pressure balance column 122 through the short circuit 13 . The second pressure balance column 122 is connected with the second lead column 112 through the aluminum foil antenna to form a passage of the outer loop antenna 3 , the second lead column 112 is the starting end of the outer loop antenna 3 , and the second pressure balance column 122 is the outer loop antenna 3 . Terminal of loop antenna 3.

In this way, the inner loop antenna 2 and the outer loop antenna 3 are connected in series through the short-circuit line 13, and the path is the first lead pin 111—the inner loop antenna 2—the first pressure balance pin 121—the short-circuit line 13— — the second pressure balance pin 122 — the outer loop antenna 3 — the second lead pin 112 .

The utility model connects the inner loop antenna 2 and the outer loop antenna 3 through the short-circuit line 13 to form a series radio frequency antenna. Due to the setting of the short-circuit line 13, the inner loop antenna 2 can be connected to the outer loop antenna 3 through the pressure balance column 12. There is no need to use a laser to engrave a 0.1 mm wide aluminum foil line segment to connect the inner loop antenna 2 and the outer loop antenna. The antenna 3 is independent and produced separately, which simplifies the production process of the aluminum foil antenna, thereby improving the product qualification rate and production efficiency, and making it possible to popularize the miniature radio frequency sensor with two aluminum foil antennas.

The thickness of the shorting line 13 is much smaller than the height of the pins of the RF chip 1 . In one embodiment, the thickness of the shorting line 13 is less than 2 micrometers, and the heights of the lead pins 11 and the pressure balance pins 12 are 15-18 micrometers. Therefore, the short-circuit line 13 does not affect the packaging and fixation of the radio frequency chip 1 .

As shown in Figure 4, when the RF chip 1 and the aluminum foil antenna are packaged, the contact resistance aluminum foil test pad is added to test the packaging. During the packaging process, the two contacts on the resistance measuring instrument are respectively contacted and connected with the contact resistance aluminum foil measuring disc 4 to obtain the resistance value between the first pressure balance pin 121 and the second pressure balance pin 122 to determine the first pressure balance pin 121. The packaging of the lead pins 111, the second lead pins 112 and the aluminum foil antenna, adjust the coating amount of the guiding conductive resin in time, change the packaging temperature and packaging pressure, and keep the measured resistance value as low as possible. Encapsulation quality, improve the stability of RFID tags.

In the present invention, a short circuit 13 is added between the pressure balance legs 12, and the lead legs 11 are connected by the pressure balance legs 12 and the short circuit 13, instead of being connected by a slender inner and outer coil connecting wire, which separates the inner and outer coils into two parts. An independent aluminum foil antenna simplifies the production process, greatly reduces the production scrap rate, and is conducive to the promotion of miniature radio frequency sensors with two inner and outer circles of radio frequency antennas in series. The packaging process improves the quality of chip packaging.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the utility model.

Claims

A radio frequency chip with a pressure balance column foot short-circuit line, characterized in that a lead column foot and a pressure balance column foot are arranged at the bottom of the radio frequency chip, and a short circuit line is arranged between the pressure balance column feet, and the short circuit line is smaller than the lead wire The height of the column base.
A radio frequency chip with pressure-balanced pin short-circuit lines according to claim 1, wherein the short-circuit lines are conductive lines made of silver or gold.
The radio frequency chip with short-circuit lines of pressure balance pins according to claim 1, characterized in that, the lead pins and the pressure balance pins are symmetrically distributed in the center.
The radio frequency chip with a pressure-balanced pin short circuit according to claim 1, wherein the lead pin comprises a first lead pin and a second lead pin, the first lead pin The pressure balance column is connected through the inner loop antenna, and the pressure balance column is connected with the second lead column through the outer loop antenna.
A radio frequency chip with a short circuit of a pressure balance column foot according to claim 1, wherein the pressure balance column foot comprises a first pressure balance column foot and a second pressure balance column foot, the first pressure balance column foot The pressure balance column foot and the second pressure balance column foot are connected through the short-circuit line.
The radio frequency chip with a pressure balance pin short circuit according to claim 1, wherein the number of the lead pins and the pressure balance pins are both two, and the lead pins are respectively provided with At the two corners of the bottom of the radio frequency chip, the pressure balance pillars are respectively arranged at the other two corners of the bottom of the radio frequency chip.
The radio frequency chip with a pressure-balanced pin short circuit according to claim 1, wherein the thickness of the short circuit is less than 2 microns.