KR100413814B1 - A method for designing RF connector in mobile phone - Google Patents

Abstract

The present invention relates to a method for designing an inspection RF connector for use in a printed circuit board of a mobile communication device, and in one embodiment applied to the present invention, the length calculation mode is a method for designing an RF connector for a mobile communication device. A first step of setting a characteristic impedance value for achieving impedance matching between the RF signal supply connector inserted from the outside and the RF connector when performing the performance test of the mobile communication device; And a second step of designing a structure of the RF connector based on the set characteristic impedance value, wherein the second step is performed by using the set characteristic impedance value, and connecting and guide terminals of the RF connector. It is characterized by calculating the length (L _C , L _G ) of each, so that the test RF signal supplied to the PCB board of the mobile communication device is transmitted by the minimum power attenuation has the effect of providing a more accurate performance test have.

Description

A method for designing RF connector in mobile phone}

The present invention relates to a method of designing an inspection RF connector for use in a printed circuit board of a mobile communication device.

In general, when a mobile communication device such as a PCS phone (Personal Communications Services phone) is shipped from the factory, an inspection for checking the operation state of the mobile communication device is required.

In addition, when a function is degraded even while using a mobile communication device, an inspection is required to identify the cause of the malfunction and to repair or replace it.

In these cases, it is checked whether each circuit of the printed circuit board mounted inside the mobile communication device is normally operated. In this case, the printed circuit board (or 'PCB (Printed Circuit Board) board) of the mobile communication device shown in FIG. By using the RF connector A mounted on the circuit board, each circuit of the PCB substrate (duplexer 10, band filter IF 11a, 11b, modem 12, control unit 13). ), The performance of the data processor 14 and the voice processor 15 is examined.

That is, the RF connector A includes a contact terminal 1 and a guide terminal 2. When a telephone call is made using a mobile communication device, as shown in FIG. One end of 1) remains short-circuited with one end of the guide terminal 2, and the other ends of the connection terminal 1 and the guide terminal 2 are respectively connected to the PCB substrate and the antenna unit, respectively.

On the other hand, when inspecting the mobile communication device, as shown in FIG. 2B, one end of the connection terminal 1 and the guide terminal 2 which are kept short-circuited by connecting the F-type connector pin 3 to the RF connector A, respectively. One end is switched to the open state, and the inspection RF signal input from the outside through the inserted F-type connector pin 3 is supplied to the respective circuits 10 to 15 of the PCB board via the connection terminal 1. do.

When the RF signal for inspection is supplied to each of the partial circuits 10 to 15 of the PCB board as described above, the inspector contacts the test probe with the input / output terminals of each of the partial circuits 10 to 15 and makes contact therewith. By checking the signal detected from the waveform or a specific value (for example, voltage, current, power, etc.) displayed on the screen of the tester, if the inspection RF signal is confirmed normally, it is determined that the performance of the corresponding circuit is normal. do.

However, the test RF signal is supplied at a high frequency of about 870 MHz when the mobile communication device is a cellular phone and about 1840 MHz when the PCS phone is connected to the F-type connector pin-connection terminal-PCB substrate (X1). On the basis of complex and various damping factors such as the contact degree between the components on the board, the length and width of the connecting and guide terminals formed in the plate shape of the conductor, and the separation distance between the connecting terminal and the guide terminal, Was unable to produce their own products, so they rely on importing all of their RF connectors.

Therefore, the present invention was created to solve the above-mentioned problems, and by changing the structure of the RF connector based on the impedance matching between the supply connector for supplying the test RF signal and the RF connector, the test RF signal The purpose of the present invention is to provide a method for designing an RF connector for inspection in which power can be transmitted with a minimum amount of attenuation.

1 shows a printed board of a mobile communication device equipped with an RF connector,

2A is a cross-sectional view of a state in which an F-type connector is not connected to an RF connector,

Figure 2b is a cross-sectional view of the F-type connector is connected to the RF connector,

2c is a rear view of the RF connector,

3 is a schematic diagram of a computer system to which an embodiment according to the present invention is applied;

4 is a flowchart to which an embodiment according to the present invention is applied;

5a and 5b show the structural relationship between the characteristic impedance and the RF connector,

6A is a plan view of a conventional RF connector (connection terminal),

6B is a plan view of an RF connector (connection terminal) according to the present invention;

7A is a plan view of a conventional RF connector (guide terminal),

7B is a plan view of an RF connector (guide terminal) according to the present invention,

8A and 8B are graphs illustrating the comparison of the amount of reflection attenuation at the connection between the RF connector and the F-type connector.

<Code Description of Main Parts of Drawing>

1: Connection terminal 2: Guide terminal

3: Pin of F type connector (Supply connector)

21: main memory 22: keyboard

23: control unit 24: secondary memory

25: monitor

A: RF Connector

As an embodiment of the present invention for achieving the above object, the present invention provides a method for designing an RF connector of a mobile communication device, the supply connector and the RF is inserted from the outside during the performance test of the mobile communication device Setting a characteristic impedance value for causing the connector to achieve impedance matching; And a second step of designing the structure of the RF connector based on the set characteristic impedance value, wherein the second step is further based on a distance d between the connection terminal and the guide terminal of the RF connector. It provides an inspection RF connector design method characterized in that.

The second step is a method for designing a test RF connector, characterized in that the length (L _C , L _G ) of the connection terminal and the guide terminal of the RF connector are respectively calculated using the set characteristic impedance value. The above problem is solved.

In addition, the present invention solves the above problems as a method for designing an RF connector for inspection, characterized in that the length (L _C , L _G ) of the connection terminal and the guide terminal of the RF connector is the same.

In addition, the supply connector of the present invention is an F-type connector, a method for designing a test RF connector, which solves the above problems.

In the second step of the present invention, using the set characteristic impedance value, the test RF connector, characterized in that for calculating the width (W _C , W _G ) of the connection terminal and the guide terminal of the RF connector, respectively. As a design method, the above-mentioned subject is solved.

In addition, the second step of the present invention is based on the separation distance (h) between the pin and the guide terminal of the supply connector, a method for designing a test RF connector, solving the above problems.

In addition, the present invention solves the above-mentioned problems as a method for designing an RF connector for inspection, characterized in that the width W _C and W _G of the connection terminal and the guide terminal are the same.

In addition, the supply connector of the present invention is an F-type connector, a method for designing a test RF connector, which solves the above problems.

The objects, features and advantages of the present invention will be more readily understood by reference to the accompanying drawings and the following detailed description.

In the structure of the RF connector A designed according to the present invention, the lengths L _C and L _G of the connection terminal 1 and the guide terminal 2 of the RF connector A are the same as in this embodiment. Can be set (L _C = L _G = L).

Further, in the structure of the RF connector A designed according to the present invention, the widths W _C and W _G of the connection terminal 1 and the guide terminal 2 of the RF connector A are different from those of the present embodiment. The same can be set (W _C = W _G = W).

3 is a partial schematic view of a computer system to which an embodiment according to the present invention is applied, and for calculating lengths L _C and L _{G of} the connection terminal 1 and the guide terminal 2 constituting the RF connector A. FIG. Storing the length calculation module 21a in which the algorithm is implemented and the width calculation module 21b in which the algorithm for calculating the widths W _C and W _G of the connection terminal 1 and the guide terminal 2 are respectively implemented. Main memory 21; A keyboard 22 for inputting various variable values for calculating the length and width of the connection terminal 1 and the guide terminal 2; A controller for calculating the length and width of the connection terminal 1 and the guide terminal 2 using various variable values input through the keyboard 22 and outputting the calculated length and width to the monitor 25; 23); And a sub memory 24 on which the length calculation module 21a or the width calculation module 21b loaded by the controller 23 from the main memory 21 is executed.

Hereinafter, a flowchart of FIGS. 4A and 4B according to an embodiment of the present invention applied to a computer system configured as described above will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2A, the performance of the mobile communication device is inspected in a state where the connection terminal 1 of the RF connector A connected to the PCB board of the mobile communication device and the guide terminal 2 connected to the antenna unit are short-circuited. If the user wishes to insert the pin 3 of the supply connector (in this embodiment, it is assumed to be an F-type connector) through one side of the RF connector A, it is inserted as shown in Fig. 2B. The pin 3 of the connected F-type connector is short-circuited with the connection terminal 1, and the connection terminal 1 and the guide terminal 2 are opened.

Accordingly, the inserted F-type connector pin 3 is shorted by contacting one end of the connecting terminal 1 downward and connected with an insulator at the center portion of the one end of the guide terminal 2 to substantially guide the terminal 2. ) And open. 2C is a rear view of the RF connector A. FIG.

At this time, the inspection RF signal supplied through the F-type connector pin 3 passes through the propagation paths X1 to X3 through one end of the connection terminal 1 in a short circuit state (Fig. 1 to 10 to 15. In order to reduce the amount of power attenuation of the inspection RF signal in the propagation paths X1 to X3, the F-type connector pin 3 and the RF connector A structurally perform impedance matching. Should be done.

More specifically, it is necessary to change the structure of the RF connector A so as to achieve impedance matching at the short-circuit point X1 where the F-type connector pin 3 and one end of the connection terminal 1 of the RF connector A are connected. Required.

1. Length calculation mode (see Fig. 4a)

First, assuming that the connection terminal 1 and the guide terminal 2 corresponding to the structure of the RF connector A are waveguides or parallel plates through which an RF signal for inspection supplied through the F-type connector pin 3 is propagated. , The characteristic impedance value for achieving impedance matching is set to 50 Hz (S401).

In addition, the separation distance d between the connection terminal 1 and the guide terminal 2 of the RF connector A is measured by a measuring device (not shown) (S402), and the measured separation distance d Assume that 0.54 mm.

After doing this, if the user specifies the length calculation mode using the keyboard 22, the controller 23 loads the length calculation module 21a from the main memory 21 into the sub memory 24, Run it.

Subsequently, the controller 23 outputs a message to the monitor 25 for inputting the variables required for the length calculation module 21a. In this case, the variable impedance value previously set for the variables input through the keyboard 22 is output. (50Ω), separation distance (d = 0.54mm), etc.

Accordingly, when values corresponding to the respective variables are input through the keyboard 22, the controller 23 substitutes the input variables into the length calculation module 21a executing in the sub memory 24 to connect the connection terminal ( 1) and the length (L _C = L _G = L) of the guide terminal 2 is calculated (S403), and the calculated length L of the connecting terminal 1 and the guide terminal 2 is expressed by the following equation (1). Is derived from

Characteristic impedance ≒ {(permeability of air x specific permeability of medium) / (dielectric constant of air x relative permittivity of medium)} ^1/2 × separation distance (d) / length (L)

Here, the length L of the connecting terminal 1 and the guide terminal 2 corresponds to the length of the connecting terminal 1 and the guide terminal 2 in the same direction as the direction in which the F-type connector pin is connected. Permeability and relative dielectric constant are composed of complex numbers, the real part acts as the intrinsic constant of the medium and the imaginary part is the attenuation variable of the medium.

2. The explosion output mode (refer to FIG. 4b)

In addition, as mentioned above, the waveguide that propagates the test RF signal for supplying the connection terminal 1 and the guide terminal 2 corresponding to the structure of the RF connector A through the F-type connector pin 3, that is, Assuming that the parallel plate is a characteristic impedance value for achieving impedance matching (S411) (S411), the separation distance h between the F-type connector pin (3) and the guide terminal (2) is a measuring device (not shown) When measured by (S412) it is assumed that the measured separation distance (h) is 0.103mm.

After doing this, as the user designates the explosion mode using the keyboard 22, the controller 23 loads the explosion module 21b from the main memory 21 into the secondary memory 24. When executed, the controller 23 outputs a message to the monitor 25 for inputting each variable necessary for the output module 21b, and at this time, the characteristic impedance value previously set for the variables input through the keyboard 22. (50Ω), separation distance (h = 0.103mm), etc.

Accordingly, when values corresponding to the respective variables are input through the keyboard 22, the controller 23 substitutes the input variables into the output module 21b running in the sub memory 24 to connect with the connection terminal. The width (W _C = W _G = W) of the guide terminal is calculated (S413). The calculated width W of the connected terminal and the guide terminal is derived by the following equation (2).

Characteristic impedance ≒ {(permeability of air x specific permeability of medium) / (dielectric constant of air x relative permittivity of medium)} ^1/2 × separation distance (h) / width (W) Equation (2)

Here, the width of the connecting terminal 1 and the guide terminal 2 corresponds to the length of the connecting terminal and the guide terminal in a direction perpendicular to the direction in which the F-type connector pin is connected, and the relative permeability and relative dielectric constant are complex numbers. The real part operates as the intrinsic constant of the medium and the imaginary part is proportional to the frequency as the attenuation variable of the medium.

Therefore, the relationship between the characteristic impedance and the length L in the length calculation mode is as shown in FIG. 5A, and the relationship between the characteristic impedance and the width W in the width calculation mode is as shown in FIG. 5B. When the characteristic impedance is set to 50 Hz and the measured separation distances d and h are 0.54 mm and 0.103 mm, respectively, the length L and the width W derived from Eqs. (1) and (2) are respectively. Corresponds to 4.07 mm and 0.776 mm.

6A to 7B are plan views of the connection terminal 1 and the guide terminal 2 of the RF connector, among which FIGS. 6A and 7A show a plan view of the connection terminal and the guide terminal of the RF connector, respectively. 6b and 7b show a plan view of the connection terminal 1 and the guide terminal 2 of the RF connector having a length L and a width W calculated according to the present invention, respectively. The short-circuit point X1 to which the F-type connector pin 3 and one end of the connection terminal 1 are connected by using the RF connector A provided with the connection terminal 1 and the guide terminal 2 of FIGS. 6B and 7B. The result of the experiment for measuring the amount of reflection attenuation in the) corresponds to Figure 8b, the result of the experiment using a conventional RF connector corresponds to Figure 8a.

For reference, the reflection attenuation amount can be derived by the following equation (3).

Reflection Attenuation (dB) = 10 × log {Reflected Power (W) / Incidence Power (W)} Equation (3)

That is, when the incident power is 1W, the reflection attenuation amount is -20dB when the reflection power is 1 × 10 ^-2 W, and the reflection attenuation amount is -40dB when the reflection power is 1 × 10 ^-4 W, and the reflection attenuation amount is -20dB. In the case of -40dB, the reflected power is smaller, so the transmitted power can be inferred as more.

Therefore, as shown in FIGS. 8A and 8B, since the RF signal for inspection of the PCS phone is about 1840 MHz, the amount of reflection attenuation corresponding thereto is -20 dB to -25 dB in the prior art, while -32 dB to-in the present invention is applied. It can be seen that it has better characteristics of transferring more power at 42dB.

Although not shown in Figures 8a and 8b, even in the case of the cellular phone it can be seen that the reflection attenuation at about 870MHz corresponding to the RF signal for inspection has better characteristics than the conventional standard when the present invention is applied.

The present invention is not limited to the above described embodiments, and various modifications and changes can be made by those skilled in the art, which are included in the spirit and scope of the present invention as defined in the appended claims.

As described above, the present invention is to ensure a stable connection between the RF connector and the F-type connector when the F-type connector is connected to the RF connector during the performance test of the mobile communication device.

Therefore, the present invention has the effect of providing a more accurate performance test by allowing the test RF signal supplied to the PCB board of the mobile communication device to be transmitted by the minimum power attenuation.

In addition, the present invention, by securing the data related to the design technology and measurement technology of the inspection RF connector, which is one of the components mounted on the printed circuit board of the mobile communication device, it is possible to produce domestically as well as to produce the inspection RF connector It has the effect of enhancing the national competitiveness by making it possible to promote technological power.

In addition, the present invention is easy to assemble in the manufacturing process of the RF connector is effective in reducing the defective rate during mass production.

Claims (9)

delete In the method of designing a RF connector of a mobile communication device, A first step of setting a characteristic impedance value for achieving impedance matching between the supply connector inserted from the outside and the RF connector when the performance test of the mobile communication device is performed; And A second step of designing the structure of the RF connector based on the set characteristic impedance value, And wherein the second step is further based on a distance d between the connection terminal and the guide terminal of the RF connector. The method of claim 2, wherein the second step, And a length (L _C , L _G ) of the connection terminal and the guide terminal of the RF connector, respectively, by using the set characteristic impedance value. The method of claim 2, wherein the lengths (L _C , L _G ) of the connection terminal and the guide terminal of the RF connector are the same. In the method of designing a RF connector of a mobile communication device, A first step of setting a characteristic impedance value for achieving impedance matching between the supply connector inserted from the outside and the RF connector when the performance test of the mobile communication device is performed; And A second step of designing the structure of the RF connector based on the set characteristic impedance value, The supply connector is an inspection RF connector design method, characterized in that the F-type connector. In the method of designing a RF connector of a mobile communication device, A first step of setting a characteristic impedance value for achieving impedance matching between the supply connector inserted from the outside and the RF connector when the performance test of the mobile communication device is performed; And A second step of designing the structure of the RF connector based on the set characteristic impedance value, The second step, And a width W _C and W _G of the connection terminal and the guide terminal of the RF connector, respectively, using the set characteristic impedance values. The method of claim 6, wherein the second step, RF connector design method, characterized in that further made based on the separation distance (h) between the pin and the guide terminal of the supply connector. 8. The method of claim 6 or 7, wherein the widths W _C and W _G of the connection terminal and the guide terminal are the same. 7. The method of claim 6, wherein the supply connector is an F-type connector.