JPH09270608A - Transmitter-receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the transmitter-receiver in which the cost is reduced through the reduction in number of components and the mount area is reduced to allow the transmitter-receiver to have provision for miniaturization. SOLUTION: One antenna 11 is used by a transmission system and a reception system via a branch part A and an amplifier 12 is arranged to the transmission system via an isolator 13 and an APC circuit 14 to control an output power of the amplifier 12 is arranged to configure the transmitter-receiver 10. Then a capacitor 20 is connected to an input terminal 13 in parallel and the capacitor 20 is provided to a transmission line of the APC circuit 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission / reception device in which one antenna is shared by a transmission system and a reception system.

[0002]

2. Description of the Related Art Generally, a transmission / reception device of a mobile communication device used in a mobile phone, a car phone or the like is constructed such that a transmission system and a reception system are shared by one antenna branching portion. In the transmission system of the transmission / reception device, conventionally, as shown in FIG.
As shown in, in order to keep the output power of the amplifier 1 constant, the output power from the amplifier 1 is branched and detected by the directional coupler 2 to about 20 dB, and the APC circuit 3 detects the output power of the amplifier 1. There is a device that controls the output power.

However, although the circuit configuration can be simplified by controlling only the directional coupler 4, the amplifier 1 is damaged by reflected power from the antenna 4 or the like, or a signal of an adjacent channel enters from the antenna 4. I
There is a problem that M (intermodulation) occurs. Further, there is a problem that the impedance of the antenna 4 is likely to change due to the frequency characteristics, and the power consumption of the amplifier 1 increases accordingly.

In order to improve such a problem, conventionally,
As shown in FIG. 10, an isolator 5 may be provided on the rear side of the directional coupler 2. The isolator 5 absorbs the reflected power from the antenna 4, and thus it is possible to prevent the damage of the amplifier 1 and the occurrence of IM due to the reflected wave, and to suppress the increase of the power consumption due to the impedance variation.

[0005]

However, since the above-mentioned conventional transmission / reception device has a circuit configuration using both the directional engager and the isolator, the number of parts is increased and mounting on the circuit board is performed. There is a problem that the area is increased, the cost is increased, and the device is enlarged.
There is also a problem that the loss in the signal line increases by both the isolator and the directional coupler.

The present invention has been made in view of the above-mentioned conventional situation, and can prevent the generation of IM and the damage of the amplifier due to the reflected power, and further reduce the number of parts to suppress the cost increase and the size increase of the apparatus. It is an object of the present invention to provide a transmission / reception device that is capable of reducing loss.

[0007]

According to the invention of claim 1, one antenna is shared by a transmission system and a reception system via a branching unit, and an amplifier is arranged in the transmission system via a non-reciprocal circuit element. In addition, in a transmission / reception device provided with an APC circuit for controlling the output power of the amplifier, a capacitance is connected to an input terminal of the nonreciprocal circuit element by branching from the terminal,
It is characterized in that the APC circuit is added in parallel to the transmission line between the amplifier and the nonreciprocal circuit element via the capacitor.

According to a second aspect of the present invention, in the first aspect, the nonreciprocal circuit device includes a magnetic assembly in which a plurality of center electrodes are arranged in ferrite so as to intersect each other in an electrically insulated state, and each center electrode. And a terminal board having an input / output terminal to which the input / output port is connected via the matching capacitor, and the capacitance is stored in the terminal board. It is characterized in that it is integrally formed and that the extraction terminal electrode for taking out the capacitance is integrally formed.

According to a third aspect of the present invention, in the first aspect, the non-reciprocal circuit device is formed by stacking a plurality of thin plate sheets, and a plurality of centers arranged so as to intersect each other in an electrically insulating state. A laminated substrate in which an electrode, a matching capacitor electrode to which the input / output port of each center electrode is connected, and an input / output terminal electrode to which the input / output port is connected via the matching capacitor electrode are stacked. The capacitor is disposed between the thin sheets, and the extraction terminal electrode for extracting the capacitor is formed integrally with the laminated substrate.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 are diagrams for explaining a transmission / reception device according to an embodiment (first embodiment) of the invention of claim 1, and FIG. 1 is a diagram showing a circuit configuration of the transmission / reception device. FIG. 3 is a perspective view showing a circuit board of a transmission / reception device.

The transmission / reception device 10 of this embodiment has a structure in which one antenna 11 is shared by a transmission system and a reception system via a branch portion A, and the basic structure is substantially the same as the conventional one. A lumped-constant type isolator 13 is interposed between the branch A of the transmission system and the amplifier 12. The isolator 13 has an extremely small amount of attenuation in the transmission direction of the transmission signal and an extremely large amount of attenuation in the opposite direction. It has characteristics. This prevents the generation of IM due to the reflected wave from the antenna 11 and damage to the amplifier 12 due to load fluctuation. In the transmission system, an AP that detects the output power from the amplifier 12 and controls the output of the amplifier 12 to be constant.
A C circuit 14 is provided.

The isolator 13 is mounted on a circuit board 15, and the input terminal 16a of the isolator 13 is connected to an input line 16 formed by patterning on the circuit board 15.
However, an output terminal 13b is connected to the output line 17, and a ground terminal (not shown) is connected to the ground line 18. The input line 16 is connected to the output section of the amplifier 12, and the output line 17 is connected to the branch section A of the antenna 11. In addition, the circuit board 15 has an APC
A transmission line 19 is formed which is connected to the circuit 14 and which extends parallel to the input line 16.

The input line 1 of the input terminal 13a
An electrode on one side of the multilayer capacitor 20 which is branched from the terminal 13a and serves as a capacitor is connected to 6, and an electrode on the other side is connected in parallel to the transmission line 19.
Thereby, the output power from the amplifier 12 is detected by the capacitor 20 after being attenuated by several dB, and the output of the amplifier 12 is controlled by the APC circuit 14 based on the detected value.

The operation and effect of this embodiment will be described.
In the present embodiment, since the capacitor 20 is connected to the input terminal 13a of the isolator 13 by branching from the input terminal 13a and the capacitor 20 is connected in parallel to the transmission line 19 of the APC circuit 14, only one chip component needs to be added. Therefore, the number of parts can be reduced and the mounting area on the circuit board 15 can be reduced as compared with the case where the conventional directional coupler is adopted, and the cost can be reduced and the size can be reduced.

Since the capacitor 20 has a smaller loss than the directional coupler, the loss in the signal line can be reduced accordingly. Isolator 1 on the transmission line
3 is provided, I due to the reflected wave from the antenna 11
It is possible to prevent damage to the amplifier 12 due to generation of M and load fluctuation, and to suppress power consumption.

FIGS. 3 and 4 are characteristic diagrams showing simulation results of the input-output pass characteristic and the input-transmission line pass characteristic of the isolator, respectively. This is an example when the output power from the amplifier is attenuated to 20 dB on the input side of the isolator, and the capacitance value of the capacitor at that time was 0.4 pF. Further, when the attenuation amount is set to 10 dB and 30 dB, it can be dealt with by setting the capacitance values to 1.4 pF and 0.12 pF, respectively.

FIGS. 5 to 7 are views for explaining a transmission / reception apparatus according to an embodiment (second embodiment) of the invention of claim 2, and FIGS. 1 and 2 are equivalent circuit diagrams of an isolator. , An exploded perspective view, and FIG. 3 is an exploded perspective view of the terminal board.

The isolator 50 of the present embodiment is of a discrete type, which has a permanent magnet 53, a magnetic assembly 54, and a magnetic assembly 54 in a magnetic closed circuit mainly composed of an upper yoke 51 and a lower yoke 52 made of magnetic soft iron. And resin case 5
5 is provided. The magnetic assembly 54
Of the ferrite 57, three center electrodes 56 are arranged on one main surface of the ferrite 57 in an electrically insulated state and intersect each other at an angle of 120 degrees.
7 is abutted on the other main surface. A DC magnetic field is applied to the magnetic assembly 54 by the permanent magnet 53.

In the resin case 55, the permanent magnet 5 is attached.
3, magnetic assembly 54, and positioning recesses 55a, 55 for accommodating the input / output port portions P1 to P3 of each center electrode 56
b and 55c are formed, and each of the input / output port units P1 to P1
Matching capacitors C1 to C3 are connected to P3. The terminating resistors R1 and R2 are connected to the one input / output port P3 via a metal piece 58 made of phosphor bronze.

A dielectric terminal board 59 is disposed on the outer bottom surface of the lower yoke 52, and the terminal board 59 has a fitting hole 59a formed therein and a protrusion formed on the lower yoke 52. It is positioned and fixed by being fitted to 52a.

The terminal board 59, as shown in FIG.
An input / output terminal electrode having a structure in which the first to third sheets 60 to 62 are laminated and integrated, and the input / output port portions P1 and P2 are connected to one side edge of the lower surface of the first sheet 60, respectively. 63, 64 are formed, and the respective terminal electrodes 63,
64 is the third sheet 62 through the side electrodes 63a and 64a.
Is drawn out to the upper surface. A ground electrode 65 is provided on the lower surface of the first sheet 60 other than the terminal electrodes 63 and 64.
Is formed, and the input / output port portion P3 and the lower yoke 52 are connected to the ground electrode 65.

A capacitance electrode 66 is formed on the lower surface of the second sheet 61 so as to face the earth electrode 63 with the sheet 61 in between, and the capacitance electrode 66 is formed through the through-hole electrode 6.
It is connected in parallel to the input terminal electrode 63 via 7. A ground terminal electrode 68 and a capacitance extraction terminal electrode 69 are formed on the other side edge of the third sheet 62, respectively. The ground terminal electrode 68 is connected to the ground electrode 65 via a side surface electrode 68a. There is.

The capacitance extracting electrode 69 is connected to the ground electrode 68 via the side surface electrode 69a, whereby the capacitance formed by the capacitance electrode 66 and the ground electrode 68 is branched from the input terminal electrode 63 and taken out. It is like this.

The operation and effect of this embodiment will be described.
The isolator 50 is mounted on the circuit board that constitutes the transmission system of the transmission / reception device. The input terminal electrode 63 of the isolator 50 is used as an input line on the amplifier side, the output terminal electrode 64 is used as an output line on the antenna side, and the ground terminal electrode 6 is used.
8 is connected to the ground line respectively, and the capacitance extraction electrode 6
9 is connected to the transmission line on the APC circuit side.

According to the present embodiment, since the capacitance electrode 66 for detecting the amplifier output is built in the terminal substrate 59 and the extraction electrode 69 for extracting the capacitance is integrally formed, only one isolator 50 is required and the amplifier output Since it is not necessary to separately prepare a component for detecting the component, the component cost can be reduced, and the mounting area of the circuit board can be further reduced, which contributes to downsizing. Further, the loss can be further reduced because the loss is only the branch amount of the isolator 50 and the capacitance electrode 66.

8 and 9 are views for explaining a transmission / reception apparatus according to an embodiment (third embodiment) of the invention of claim 3, FIG. 8 is an exploded perspective view of an isolator, and FIG.
FIG. 4 is an exploded perspective view of a laminated substrate.

Lumped constant type isolator 10 of this embodiment
In No. 0, the permanent magnet 102 is arranged in the box-shaped lower yoke 101 and the laminated substrate 103 is arranged.
Arrange the ferrite 104 in the storage recess 103a of 3,
The upper yoke 105 is mounted on the lower yoke 101, and the electrical characteristics and functions are the same as those in the above embodiment.

The laminated substrate 103 is formed by patterning predetermined electrodes, which will be described later, on the first to eleventh dielectric thin sheets 106 to 116, laminating the thin sheets 106 to 116, and integrally sintering them. The above electrodes are embedded in the sintered body.

The second to fourth thin sheet sheets 107 to 109
Center electrodes 117 to 119 are formed on the sheet, and the center electrodes 117 to 119 are arranged in an electrically insulating state with the sheet sandwiched therebetween and intersecting at an angle of 120 degrees.

Matching capacitor electrodes C1 to C3 are formed on the sixth thin sheet 111, and the earth electrodes 120 and 121 formed on the thin sheet 111 and the fifth and seventh thin sheets 110 and 112 respectively. A matching circuit is configured. The capacitor electrodes C1 to C3 are connected to the input / output port portions P1 of the center electrodes 117 to 119, respectively.
To P3 are connected, and the port portion P3 is connected to the first
It is connected to the resistive film 122 patterned on the thin sheet 106.

Band-shaped terminal sheets 123 and 124 are integrally laminated on both edges of the eleventh thin sheet 116, and the input terminal electrode 12 is formed on the terminal sheets 123 and 124.
6, an output terminal electrode 127, a ground electrode 128, ... And a capacitance extracting terminal electrode 129 are formed. The input / output port portion P1 is connected to the input terminal electrode 126, the output terminal electrode 127 is connected to P2, and the ground electrode 128 is connected to P3. Here, the above-mentioned electrodes are through-hole electrodes 13 formed on the thin sheet 106 to 116.
0, the side surface electrode 131 is connected in the stacking direction.

The tenth thin sheet 115 has a capacitive electrode 133 branched and connected to an input terminal electrode 126.
Is formed, and the capacitance electrode 133 is connected to the capacitance extraction electrode 129 via the electrode 134 formed on the eleventh thin sheet 116.

The operation and effect of this embodiment will be described.
The isolator 100 of the present embodiment is mounted on the circuit board that constitutes the transmission system of the transmission / reception device, as described above.

According to the present embodiment, the central electrodes 117 to 119 and the capacitor electrodes C1 to C3 are embedded in the laminated substrate 103, and the capacitance electrode 133 is embedded, and the extraction terminal electrode 129 for extracting the capacitance is integrally formed on the terminal sheet 124. Therefore, only one isolator 100 is required, the cost of parts can be reduced, the size can be reduced, and the same effect as the second embodiment can be obtained.

Further, in the present embodiment, a large number of thin sheet 1
Since the center electrodes 107 to 109, the capacitor electrodes C1 to C3, the capacitance electrode 133, etc. are arranged in 06 to 116 and are laminated integrally, the respective electrodes can be arranged three-dimensionally in the stacking direction, and the overall size of the component can be reduced. Not only can it contribute to weight reduction, but it can also contribute to weight reduction.

[0036]

As described above, according to the transmitting and receiving apparatus of the invention of claim 1, the capacitance is connected by branching from the input terminal of the non-reciprocal circuit element, and the capacitance is connected in parallel to the transmission line of the APC circuit. Since it has been added, it is only necessary to add one capacitor, so the number of parts can be reduced and the cost can be reduced, the mounting area can be reduced and miniaturization can be accommodated, and the loss in the signal line can be reduced. There is an effect that can be reduced.

According to the second aspect of the present invention, since the capacitor is integrally formed on the terminal substrate forming the nonreciprocal circuit element and the extraction terminal electrode for taking out the capacitor is integrally formed, only one nonreciprocal circuit element is required. The cost can be further reduced and the size can be reduced.

According to the third aspect of the present invention, the capacitors are integrally laminated in the laminated substrate which constitutes the non-reciprocal circuit device, and the capacitance extracting terminal electrodes are integrally formed. Therefore, cost reduction and size reduction can be achieved. There is an effect that can contribute.

[Brief description of drawings]

FIG. 1 is a diagram showing a circuit configuration of a transmission / reception device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a circuit board of the transmission / reception device.

FIG. 3 is a characteristic diagram showing a pass characteristic of the embodiment.

FIG. 4 is a characteristic diagram showing a pass characteristic of the embodiment.

FIG. 5 is an equivalent circuit diagram showing an isolator according to an embodiment of the present invention.

FIG. 6 is an exploded perspective view of the isolator.

FIG. 7 is an exploded perspective view of a terminal board of the isolator.

FIG. 8 is an exploded perspective view showing an isolator according to an embodiment of the present invention.

FIG. 9 is an exploded perspective view of a laminated substrate of the isolator.

FIG. 10 is a diagram showing a circuit configuration of a conventional transmission / reception device.

FIG. 11 is a diagram showing a circuit configuration of another conventional transmission / reception device.

[Explanation of symbols]

 10 Transmitting / Receiving Device 11 Antenna 12 Amplifier 13, 50, 100 Isolator 13a Input Terminal 14 APC Circuit 19 Transmission Line 20 Single Plate Capacitor (Capacitance) 56, 117-119 Center Electrode 57, 104 Ferrite 59 Terminal Board 66, 133 Capacitance Electrode 69 , 129 Capacitance extraction terminal electrode 103 Laminated substrate 106 to 116 Thin sheet P1 to P3 I / O ports C1 to C3 Matching capacitor

Claims (3)

[Claims] 1. An antenna is shared by a transmission system and a reception system via a branching unit, an amplifier is disposed in the transmission system via a non-reciprocal circuit element, and output power of the amplifier is controlled. In a transmission / reception device provided with an APC circuit, an input terminal of the non-reciprocal circuit element is branched from the terminal to connect a capacitor, and the APC circuit is connected to an amplifier and a non-reciprocal circuit element via the capacitor. A transmission / reception device characterized by being added in parallel to a transmission line between them. 2. The magnetic assembly according to claim 1, wherein the non-reciprocal circuit device comprises a ferrite and a magnetic assembly in which a plurality of center electrodes are arranged to intersect each other in an electrically insulated state, and an input / output port of each center electrode. A matching capacitor to be connected, and a terminal board having an input / output terminal to which the input / output port is connected via the matching capacitor,
A transmission / reception device, wherein the capacitance is formed integrally with the terminal substrate, and extraction terminal electrodes for extracting the capacitance are formed integrally. 3. The nonreciprocal circuit device according to claim 1, wherein the nonreciprocal circuit element is formed by stacking a plurality of thin sheet sheets, and a plurality of center electrodes arranged so as to intersect each other in an electrically insulating state between the thin sheet sheets. It is composed of a laminated substrate in which a matching capacitor electrode to which the input / output port of the center electrode is connected and an input / output terminal electrode to which the above input / output port is connected via the matching capacitor electrode are stacked. The transmitting / receiving device is characterized in that the capacitor is arranged between the thin sheets, and an extraction terminal electrode for extracting the capacitor is formed integrally with the laminated substrate.