JP3341830B2 - Transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmitter for simplifying a structure for mounting an RF module for amplifying a high-frequency signal by power and outputting the amplified signal to an antenna to a circuit board.

[0002]

[Related Background Art] Recently, as one of techniques for simultaneously using radio waves of a limited bandwidth by a plurality of users, WC has been proposed.
DMA (Wideband-Code Division Multiple Access;
Attention has been paid to a wideband code division multiple access system. CD
The MA system is a system in which a large number of carriers are basically set within a limited frequency band, and each carrier is shared by a plurality of users. This CDMA system has the advantage that the quality of communication can be kept high by suppressing noise mixing, multipath and fading, and furthermore, the problem of handover, etc., and its application to mobile phones is attracting attention. .

Now, built into this kind of mobile phone,
A transmitting unit that power-amplifies a high-frequency signal composed of a digitally modulated wave and drives an antenna usually has a magnetically shielded R
It is packaged as an F module, and is realized as a unit component whose stable operation is guaranteed.
Such an RF module is mounted on a predetermined circuit board, coupled to an antenna, and incorporated in a housing of a mobile phone.

[0004]

Conventionally, this type of RF module is mounted on a circuit board exclusively as shown in FIG. That is, the RF module 1
Is attached to a predetermined position of the circuit board 2 by screwing or the like, and the RF module 1 and the circuit board 2 are electrically connected to each other via a flexible multi-core flat cable 3 or the like. The multi-core flat cable 3 includes a power supply line for the RF module 1, a high-frequency input signal line, and various control signal lines for gain adjustment and bias adjustment.

[0005] The transmission output for driving the antenna 4 after being power-amplified by the RF module 1 is output from the RF module 1.
The signal is output via a coaxial cable 5 derived from the above, and the connection between the coaxial cable 5 and the circuit board 2 is performed by impedance matching via a plug 6. Here, the built-in antenna mounted on the circuit board 2 is shown as the antenna 4. However, when the main antenna (not shown) provided on the housing of the mobile phone is driven, the built-in antenna is provided on the circuit board 2. The transmission output is supplied from the circuit board 2 to the main antenna via the so-called antenna clip.

However, such an RF module 1
In the transmission device having an assembly structure with the circuit board 2, the coaxial cable 5 needs to be led out from the RF module 1, and the plug 6 needs to be incorporated in the circuit board 2. For this reason, not only the manufacturing and parts costs are increased, but also the mounting of the RF module 1 on the circuit board 2 and the electrical connection between the modules are troublesome.

The present invention has been made in view of such circumstances, and has as its object to simplify the work of mounting an RF module on a circuit board and to reduce the cost of parts by a simple structure. To provide a transmission device.

[0008]

In order to achieve the above-mentioned object, a transmitting apparatus according to the present invention comprises an RF module mounted on a circuit board for power-amplifying a high-frequency signal transmitted and output via an antenna. An output terminal comprising a tongue-shaped elastic piece for outputting a transmission signal power-amplified by the RF module is provided on a lower surface of the RF module forming a mounting portion for the circuit board; A portion of the area where the RF module is mounted, facing the output terminal, is provided with a transmission line of a transmission signal, which is formed of a microstrip line having a predetermined impedance, and the output terminal is press-contacted and high-frequency coupled. I have.

In particular, the transmission line of a predetermined impedance formed of a line conductor sandwiched between ground conductors with a predetermined gap therebetween is formed on the surface of the tongue-shaped elastic piece. An output terminal is realized, and by simply mounting the RF module at a predetermined position on a circuit board, the output terminal is pressed into contact with the microstrip line so that the electrical connection can be impedance-matched and easily performed. It is characterized by:

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A transmission device according to an embodiment of the present invention will be described below with reference to the accompanying drawings, particularly a structure for mounting an RF module 1 constituting a transmission device on a circuit board 2. FIG. 1 is an exploded perspective view showing a schematic configuration of a transmission apparatus according to this embodiment, and 1 is an RF module configured by incorporating a power amplification circuit or the like for amplifying a high-frequency signal in a box-shaped electromagnetic shield case 1a. It is. The RF module 1 is packaged with the power amplifier circuit and the like built therein by incorporating, for example, an insulating printed wiring board 1b on which a power amplifier circuit and the like are mounted as a bottom cover of the electromagnetic shield case 1a. Implemented as a unit component. The RF module 1 uses the bottom cover of the circuit board 2
It is mounted on the upper predetermined position.

On the lower surface of the RF module 1, a connector 11 such as a power supply line, which electrically connects to the circuit board 2, is provided. An output terminal 12 formed of a tongue-shaped elastic piece for outputting a transmission signal is provided. As shown in a partially enlarged view in FIG. 1, the output terminal 12 has a line conductor 14 forming a center line and a pair of ground conductors 15, And 15 are provided in parallel with a predetermined gap therebetween to form a transmission line having a predetermined impedance,
It has a structure with its tip as a contact part. The output terminal 12 having such a structure is provided such that a tip portion forming a contact portion protrudes from the lower surface of the RF module 1 and is elastically deformable inside the output terminal.

On the other hand, the circuit board 2 on which the RF module 1 having the above-described structure is mounted is located in a region where the RF module 1 is mounted, and is mechanically and electrically coupled to the connector 11. A plug 16 is attached. The plug 16 forms a pair with the connector 11, and is inserted into the connector (jack) 11.
The power supply line and the high-frequency input signal line between the F module 1 and the circuit board 2 and the various control signal lines for gain adjustment and bias adjustment are mutually connected. At the same time, the connector 11 and the plug 16 also play a role in defining the mounting position of the RF module 2 with respect to the circuit board 2 by the fitting connection.

The circuit board 2 is provided with a microstrip line 17 having a predetermined impedance. The microstrip line 17 is a digitally modulated wave (transmission signal) that is amplified in power by the RF module 1 and output from the RF module 1 via the output terminal 12 described above.
To the transmission line leading to the antenna 4. In particular, a tip portion 17 a extending to the mounting area of the RF module 1 of the microstrip line 17 and positioned at a portion facing the output terminal 12 is formed as a contact portion with the output terminal 12.

When the RF module 1 is mounted on the circuit board 2 by inserting the connector 11 and the plug 16 into each other as described above, the output terminal 12 described above is elastically deformed and its tip is microstripped. The tip of the line 17 (contact portion) 17 a is pressed into contact with the microstrip line 17. In particular, the coupling between the output terminal 12 and the microstrip line 17 is performed with impedance matching. The transmission signal power-amplified by the RF module 1 is transmitted from the output terminal 12 to the antenna 4 via the microstrip line 17 with high efficiency.

The RF module 1 mounted on the circuit board 2 as described above is, for example, the RF module 1
Are firmly attached and fixed to the circuit board 2 using bolts 18 provided through the four corners of the electromagnetic shield case 1a forming the housing. Or, although not specifically shown,
The legs protruding from the four corners of the electromagnetic shield case 1a are firmly attached to the circuit board 2, for example, by fitting them into fitting holes provided in advance. By such positioning of the mounting position of the RF module 1, the coupling between the microstrip line 17 and the tongue-shaped output terminal 12 is stably maintained.

As described above, the tongue-shaped output terminal 12 provided on the lower surface of the RF module 1 is pressed against the microstrip line 17 formed on the circuit board 2 so that the RF module 1 and the antenna 4 are impedance-matched. According to this device configured to be coupled by
There is no need to derive an amplified output (digitally modulated wave) from the module 1 while guaranteeing impedance using a coaxial cable. Moreover, in the circuit board 2, the digitally modulated wave (transmitted signal) amplified by the RF module 1 is stably provided via the microstrip line 17 impedance-matched to the output terminal 12 without providing the plug 6. It can be received and supplied to the antenna 4.

Therefore, it is possible to greatly simplify the configuration of the output system of the digitally modulated wave (transmission signal) that has been power-amplified by the RF module 1, and if only the number of components is reduced to reduce the cost of the components. Therefore, it is possible to reduce the production (assembly) cost. The tongue-shaped output terminal 12 is connected to the microstrip line 1 by its own elastic force.
7, it is possible to stably maintain the impedance-matched coupling state due to contact with the microstrip line 17, and thus efficiently transmit the power-amplified digital modulated wave (transmission signal) to the antenna 4. An effect such as being able to be achieved is achieved.

The present invention is not limited to the above embodiment. For example, the connection of the power supply line and the like to the RF module 1 may be performed using a flexible multi-core flat cable or the like. The connector (jack) 11 for connecting the power supply line and the like is also formed as a connector terminal formed of, for example, a plurality of tongue-shaped elastic pieces, and is pressed into contact with electrodes and signal terminals provided on the circuit board 2. It is also possible to configure so as to make the connection. By doing so, it is possible to further facilitate the connection between the RF module 1 and the circuit board 2. In addition, the present invention can be variously modified and implemented without departing from the gist thereof.

[0019]

As described above, according to the present invention, an output terminal comprising a tongue-shaped elastic piece whose impedance is guaranteed is provided on the lower surface of an RF module mounted on a circuit board. Is configured to provide a high-frequency transmission line of a microstrip line with which the output terminal is pressed against the impedance, and to guide a digital modulation wave output from the RF module to an antenna. Can be easily and stably performed while assuring its high-frequency characteristics stably. In addition, the number of components can be reduced to reduce the cost of manufacturing and parts, and further, there can be obtained a great effect in practical use such as simplification of assembly.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view illustrating a schematic configuration of a transmission device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a schematic configuration of a conventional general transmitting apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 RF module 2 circuit board 4 antenna 11 connector 12 output terminal (tongue-like elastic piece) 17 microstrip line

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 1/034 H01P 5/08 H05K 1/18

Claims (2)

(57) [Claims] 1. A transmission device comprising an RF module for power-amplifying a high-frequency signal transmitted and output via an antenna mounted on a circuit board, wherein the RF module forms a mounting portion with respect to the circuit board. Further comprising an output terminal comprising a tongue-shaped elastic piece for outputting a power-amplified transmission signal, wherein the circuit board is provided with a microstrip line having a predetermined impedance on a portion of the mounting portion of the RF module facing the output terminal. And a transmission line of a transmission signal, wherein the transmission terminal is press-contacted and high-frequency coupled. 2. The transmission terminal according to claim 1, wherein the output terminal has a predetermined impedance transmission line formed of a line conductor sandwiched between ground conductors with a predetermined gap therebetween on the surface of the tongue-shaped elastic piece. 2. The transmission device according to 1.