JP2000324029A - Radio device and switch constituting method for radio device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a current reaching an unselected antenna from being consumed by the composite resistance of a matching circuit and a terminating circuit to become reactive power by terminating the unselected antenna through an antenna changeover switch part and a terminating circuit part not through the matching circuit. SOLUTION: A TRX antenna 1 with antenna selection diversity and an RX antenna 2 with antenna switching diversity are connected to the antenna changeover switch part 3 and fixed type terminating circuits 4 and 5 are connected outside the antenna changeover switch part 3. A TRX antenna matching circuit 6 is connected to the TRX antenna 1 and an RX antenna matching circuit 7 is connected to outside the antenna changeover switch part 3 between the RX antenna 2 and antenna changeover switch part 3. A reception part 8 and a transmission part 9 are connected to the antenna changeover switch part 3 and changeover switches 10 and 19 are provided inside the antenna changeover switch part 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio using an antenna switching diversity and a method for configuring a switch of a radio.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional radio using an antenna switching diversity system. 7, reference numeral 1 denotes a TRX antenna (TRX antenna), 2 denotes an RX antenna (RX antenna), 3 denotes an antenna switch unit,
Numerals 5 and 5 are connected to the outside of the antenna changeover switch unit 3 and are fixed termination circuits using inductors, capacitors or coaxial lines, etc., 6 is a matching circuit for the TRX antenna connected to the TRX antenna 1, and 7 is an RX antenna 2 A matching circuit for an RX antenna connected between the antenna switch unit 3 and the antenna switch unit 3; 8 is a receiving unit connected to the antenna switch unit 3; 9 is an antenna switch unit; The transmission units connected to 3 are the antenna switching unit 3.
A switch 28 provided inside the antenna 2 is an antenna feeding point to the RX antenna 2. As shown in FIG. 7, a changeover switch 10 inside the antenna changeover switch unit 3,
13, 15, 16 and 18 are open, and the changeover switches 14 and 17 are closed.

In a conventional radio using an antenna switching diversity system, a TRX antenna 1 and an R
In order to reduce the loss due to the coupling between the antennas when there are a plurality of antennas such as the X antenna 2, the termination condition of the non-selected antenna which is not selected because the received signal strength is not strong compared with other antennas is optimized. I needed to. In this case, for example, as disclosed in Japanese Patent Application Laid-Open No. H10-75192, a transmission line length adjustment circuit, a termination circuit, or the like is inserted for adjustment. By optimally setting the phase of the transmission line length adjusting circuit or the terminating circuit, the non-selected antenna is not electrically present as viewed from the selected antenna, so that the performance of the selected antenna is not affected.

However, in the configuration of a conventional wireless device using the above-described antenna switching diversity system, FIG.
As shown in (1), when the TRX antenna 1 is a selected antenna and the RX antenna 2 is a non-selected antenna, the RX antenna 2 always passes through the matching circuit 7 when terminated. Therefore, when the antenna changeover switch 3 side is observed from the antenna feeding point 28, there is a possibility that the impedance enters the inside (close to 50Ω) on the Smith chart by the RX antenna matching circuit 7. In such a state, the RX antenna 2 which is a non-selected antenna
Is consumed by the combined resistance of the matching circuit 7 and the terminating circuit 5, resulting in reactive power.

Further, in the fixed type termination circuit 5 using an inductor, a capacitor, a coaxial line, or the like, the optimal termination condition is effective only for one frequency, so that the effect is less effective in a radio device using a wide band. was there.

[0006]

As described above, in the configuration of the conventional radio using the antenna switching diversity system, when the non-selected antenna is terminated, the radio always passes through the matching circuit. There is a problem that the riding current is consumed by the combined resistance of the matching circuit and the termination circuit, resulting in reactive power.
Furthermore, in a fixed-type termination circuit using an inductor, a capacitor, a coaxial line, or the like, the optimal termination condition is effective only for one frequency, so that there is a problem that the effect is weak in a radio device using a wide band.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problem. When an unselected antenna is terminated, it is terminated without passing through a matching circuit, so that the current on the unselected antenna is reduced. It is an object of the present invention to provide a wireless device and a switch configuration method of the wireless device which are not consumed by the combined resistance of the matching circuit and the terminating circuit and become reactive power. Another object of the present invention is to provide a wireless device and a wireless device switch configuration method which are effective for a wireless device using a wide band by using a termination circuit whose phase changes according to the frequency used. is there. Still another object of the present invention is to provide a radio and a switch configuration method of the radio, in which a terminating circuit or a matching circuit is provided inside the antenna changeover switch unit, whereby the size of the radio can be reduced. .

[0008]

A radio device according to the present invention is a radio device using switching diversity for selecting a plurality of antennas in accordance with received signal strength, and is connected to an unselected non-selected antenna. An antenna switch unit that switches a plurality of antennas; a termination circuit unit connected to the antenna switch unit; and a matching circuit unit connected to the antenna switch unit. The terminal is terminated via the antenna changeover switch section and the terminating circuit section without passing through a circuit.

A wireless device according to the present invention is a wireless device using switching diversity for selecting a plurality of antennas according to received signal strength, and switches a plurality of antennas connected to unselected non-selected antennas. An antenna changeover switch unit, a termination circuit unit built in the antenna changeover switch unit, and a matching circuit unit connected to the antenna changeover switch unit, wherein the non-selected antenna does not pass through the matching circuit. The terminal is terminated via the antenna switch unit and the termination circuit unit.

A wireless device according to the present invention is a wireless device using switching diversity for selecting a plurality of antennas according to received signal strength, and switches a plurality of antennas connected to an unselected non-selected antenna. An antenna changeover switch unit, a termination circuit unit built in the antenna changeover switch unit, and a matching circuit unit built in the antenna changeover switch unit, wherein the non-selected antenna does not pass through the matching circuit. The terminal is terminated via the antenna switch unit and the termination circuit unit.

Here, in the radio device according to the present invention, the terminating circuit section can change the phase of the terminating circuit in accordance with a used frequency to create a terminating condition.

Here, in the wireless device of the present invention, the terminating circuit section can change the phase of the terminating circuit in accordance with the frequency used by using a varicap diode to create a terminating condition.

A switch configuration method for a wireless device according to the present invention comprises:
In a switch configuration method of a wireless device using switching diversity, an unselected antenna not selected based on a received signal strength is terminated via a termination circuit unit without passing through a matching circuit.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings.

Embodiment 1 FIG. 1 shows a wireless device and a switch configuration method of the wireless device according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a TRX antenna that is an antenna for antenna selection (switching) diversity, 2 denotes an RX antenna that is an antenna for antenna switching diversity,
Reference numeral 3 denotes an antenna changeover switch unit, 4 and 5 are connected to the outside of the antenna changeover switch unit 3, and a fixed type termination circuit using an inductor, a capacitor or a coaxial line, etc., and 6 is for a TRX antenna connected to the TRX antenna 1. A matching circuit 7 is an RX antenna matching circuit connected between the RX antenna 2 and the antenna switch unit 3 and connected to the outside of the antenna switch unit 3, and a reception circuit 8 connected to the antenna switch unit 3. And 9, a transmission unit connected to the antenna changeover switch unit 3, 10 to 19 are changeover switches provided inside the antenna changeover switch unit 3, 2
Reference numeral 9 denotes an antenna feeding point to the RX antenna 2.

In the following embodiment, a case where the TRX antenna 1 is a selected antenna and the RX antenna 2 is a non-selected antenna will be described as an example. As illustrated in FIG. 1, the TRX antenna 1 as a selection antenna is connected to a receiving unit 8 via a changeover switch 11 and a matching circuit 6 and further via changeover switches 12 and 14. The changeover switches 10, 13, 15, and 16 are open. Unlike the case of the selected antenna 1, the RX antenna 2, which is a non-selected antenna, is terminated via the terminating circuit 5 directly via the changeover switch 17 without passing through the matching circuit 7. The changeover switches 18 and 19 are open. Since the termination circuit 5 is adjusted to an optimal phase by the electrical length of the RX antenna 2, almost no current flows through the RX antenna 2 which is a non-selected antenna.
Therefore, no reactive power is generated. Therefore, it is possible to prevent the performance of the TRX antenna 1 as the selected antenna from being adversely affected by the coupling (coupling between antennas) of the RX antenna 2 as the non-selected antenna.

As described above, according to the first embodiment, unlike the case where the non-selected antenna is the selected antenna, the non-selected antenna is terminated directly via the terminating circuit via the switch without passing through the matching circuit. Current hardly flows through the non-selected antenna, and thus no reactive power is generated. Therefore, it is possible to prevent the performance of the selected antenna from being adversely affected by the coupling of the non-selected antenna (coupling between antennas).

Embodiment 2 FIG. 2 shows a wireless device and a switch configuration method of the wireless device according to Embodiment 2 of the present invention. 2 that have the same reference numerals as those in FIG. 1 have the same functions, and a description thereof will be omitted. Unless otherwise specified, the open / closed state of the changeover switch is the same as the open / closed state illustrated in FIG. Referring to FIG.
Are a choke coil 21 connected to the antenna changeover switch 3, a capacitor 22 connected in parallel with the choke coil 21 and having one side grounded,
Varicap diode 2 connected to one side and grounded on one side
0 and a DC cut capacitor 36, and the terminating circuit 27 includes a choke coil 25 connected to the antenna changeover switch unit 3, a capacitor 26 connected in parallel with the choke coil 25 and having one side grounded, and an antenna changeover switch. A varicap diode 24 connected to the unit 3 and one side grounded, and a DC cut capacitor 35
It is composed of

As shown in FIG. 2, in the case of a radio using a wide band frequency, the terminating circuit 27 of the RX antenna 2 which is a non-selected antenna changes the voltage at the voltage application point 30 according to the frequency used. Thus, the capacitance of the varicap diode 24 is changed, and the phase is changed, so that the optimum termination condition can always be obtained. That is, the optimum termination condition can be constantly maintained by changing according to the frequency used. The same effect can be obtained by combining an inductor and a switch.

As described above, according to the second embodiment, by changing the phase of the termination circuit according to the frequency to be used, it is possible to always maintain the optimal termination condition.
The wireless device and the wireless device switch configuration method of the present invention can be applied to a wireless device using a wideband frequency.

Embodiment 3 FIG. 3 shows a radio and a switch configuration method of the radio in Embodiment 3 of the present invention. 3 that have the same reference numerals as those in FIG. 1 or FIG. 2 have the same functions, and a description thereof will be omitted. Unless otherwise specified, the open / closed state of the changeover switch is the same as the open / closed state illustrated in FIG. As shown in FIG. 3, in the antenna selection (switching) diversity, the phase that creates the optimal termination condition of the non-selected antenna depends on the electrical length of the non-selected antenna RX antenna 2 and the RX antenna 2
The terminating circuits 4 and 5 can be provided inside the antenna changeover switch unit 3 in a wireless device having a fixed electric length or the like because the length is determined by the line length between the antenna changeover unit 3 and the antenna changeover switch unit 3. As a result, the size of the wireless device can be reduced.

As described above, according to the third embodiment, by providing a terminating circuit inside the antenna switch unit, the size of the radio can be reduced.

Embodiment 4 FIG. 4 shows a radio and a switch configuration method of the radio in Embodiment 4 of the present invention. 4 that have the same reference numerals as those in FIGS. 1 to 3 have the same functions, and a description thereof will be omitted. Unless otherwise specified, the open / closed state of the changeover switch is the same as the open / closed state illustrated in FIG.

In FIG. 4, the terminating circuit 23 includes a choke coil 21 connected to the changeover switch 10, a capacitor 22 connected in parallel to the choke coil 21 and having one side grounded, and one connected to the changeover switch 10 and grounded. The termination circuit 27 includes a varicap diode 20 and a DC cut capacitor 36, and includes a choke coil 25 connected to the changeover switch 17, a capacitor 26 connected in parallel with the choke coil 25 and having one side grounded, The varicap diode 24 includes a varicap diode 24 connected to one side and grounded on one side, and a DC cut capacitor 35. As shown in FIG. 4, in the case of a radio using a wide band frequency, the terminating circuit 27 of the RX antenna 2 which is a non-selection antenna changes the voltage of the voltage application point 30 according to the frequency used, thereby causing a varicap. By changing the capacitance of the diode 24 and changing the phase, the optimum termination condition can always be obtained. In other words, the phase of the termination circuit 27 can be adjusted depending on the frequency used, and the optimal termination condition can always be maintained. The same effect can be obtained by combining an inductor and a switch.

As described above, according to the fourth embodiment, the optimum termination condition can always be maintained by changing the phase of the termination circuit according to the frequency used.
The wireless device and the wireless device switch configuration method of the present invention can be applied to a wireless device using a wideband frequency.

Embodiment 5 FIG. 5 shows a radio device and a radio switch configuration method according to a fifth embodiment of the present invention. In FIG. 5, components denoted by the same reference numerals as those in FIGS. 1 to 4 have the same functions, and thus description thereof will be omitted. Unless otherwise specified, the open / closed state of the changeover switch is the same as the open / closed state illustrated in FIG. Embodiment 3 above
In the above, the terminating circuits 4 and 5 are provided inside the antenna changeover switch unit 3 to reduce the size of the wireless device. In the fifth embodiment, in order to further reduce the size of the radio, the matching circuit 6 for the TRX antenna and the RX
The antenna matching circuit 7 is connected to the antenna switch unit 3
It can be provided in.

As described above, according to the fifth embodiment, the TRX
By providing the antenna matching circuit and the RX antenna matching circuit in the antenna switch unit, the size of the wireless device can be further reduced.

Embodiment 6 FIG. 6 shows a wireless device and a switch configuration method of the wireless device according to Embodiment 6 of the present invention. 6 that have the same reference numerals as those in FIGS. 1 to 5 have the same functions, and a description thereof will be omitted. Unless otherwise specified, the open / closed state of the changeover switch is the same as the open / closed state illustrated in FIG.

In FIG. 6, a terminating circuit 23 includes a choke coil 21 connected to the changeover switch 10 at the time of ON, a capacitor 22 connected in parallel with the choke coil 21 and having one side grounded, and one connected to the changeover switch 10 and one side. The terminating circuit 27 includes a grounded varicap diode 20 and a DC cut capacitor 36.
It comprises a choke coil 25 connected to the changeover switch 17, a capacitor 26 connected in parallel with the choke coil 25 and having one side grounded, a varicap diode 24 connected to the changeover switch 17 and one side grounded, and a DC cut capacitor 35. Have been. As shown in FIG. 6, in the case of a radio using a wideband frequency, the terminating circuit 27 of the RX antenna 2 which is a non-selection antenna changes the voltage at the voltage application point 30 according to the frequency used, thereby causing a varicap. By changing the capacitance of the diode 24 and changing the phase, the optimum termination condition can always be obtained.
In other words, the phase of the termination circuit 27 can be adjusted depending on the frequency used, and the optimal termination condition can always be maintained. The same effect can be obtained by combining an inductor and a switch.

As described above, according to the sixth embodiment, the optimum termination condition can always be maintained by changing the phase of the termination circuit according to the frequency used.
The wireless device and the wireless device switch configuration method of the present invention can be applied to a wireless device using a wideband frequency.

Unlike the first, third, or fifth embodiment, the terminating circuits 23 and 27 are connected to the outside of the antenna switching unit 3,
Matching circuits 6, 7 and the like can be provided inside. Thus, the size of the wireless device can be reduced.

[0032]

As described above, according to the radio device and the switch configuration method of the radio device of the present invention, when the non-selected antenna is terminated, the non-selected antenna is terminated without passing through the matching circuit. It is possible to provide a wireless device and a switch configuration method of the wireless device, in which the loaded current is not consumed by the combined resistance of the matching circuit and the termination circuit and becomes reactive power. Further, according to the wireless device and the switch configuration method of the wireless device of the present invention, by using a termination circuit whose phase changes according to the frequency to be used, the wireless device and the wireless device are also effective for a wireless device using a wide band. A switch configuration method for the machine. Furthermore,
ADVANTAGE OF THE INVENTION According to the radio | wireless apparatus of this invention, and the switch construction method of a radio | wireless apparatus, by installing a termination circuit or a matching circuit inside an antenna changeover switch part, the radio | wireless apparatus which can achieve miniaturization of a radio and radio A switch configuration method can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a wireless device and a switch configuration method of the wireless device according to Embodiment 1 of the present invention.

FIG. 2 is a diagram illustrating a wireless device and a switch configuration method of the wireless device according to a second embodiment of the present invention.

FIG. 3 is a diagram illustrating a wireless device and a switch configuration method of the wireless device according to a third embodiment of the present invention.

FIG. 4 is a diagram illustrating a wireless device and a switch configuration method of the wireless device according to a fourth embodiment of the present invention.

FIG. 5 is a diagram illustrating a wireless device and a switch configuration method of the wireless device according to a fifth embodiment of the present invention.

FIG. 6 is a diagram illustrating a wireless device and a switch configuration method of the wireless device according to a sixth embodiment of the present invention.

FIG. 7 is a diagram showing a conventional wireless device using an antenna switching diversity system.

[Explanation of symbols]

1 TRX antenna, 2 RX antenna, 3 antenna changeover switch section, 4, 5 fixed termination circuit, 6
Matching circuit for TRX antenna, 7 Matching circuit for RX antenna, 8 Receiver, 9 Transmitter, 10 to 1
9 Changeover switch, 20, 24 Varicap diode, 21, 25 Choke coil, 22, 26
Capacitors, 28, 29 antenna feed points, 30,
31 voltage application point, 35, 36 DC cut capacitor.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5J021 AA02 CA04 CA06 DB05 FA03 FA04 FA06 FA11 FA31 HA06 JA02 JA03 JA07 5K059 CC03 DD02 DD07 DD27 EE03 5K062 AA01 AB14 AC01 AE02 AE05 AG01 BA01 BB03 BB09 BB13 BD02 BE00

Claims (6)

[Claims] 1. A wireless device using switching diversity for selecting a plurality of antennas according to a received signal strength, comprising: an antenna switching switch unit for switching a plurality of antennas connected to a non-selected non-selected antenna; A termination circuit unit connected to the antenna changeover switch unit, and a matching circuit unit connected to the antenna changeover switch unit, wherein the non-selected antenna does not pass through the matching circuit and the antenna changeover switch unit And a radio terminal terminated via the termination circuit unit. 2. A wireless device using switching diversity for selecting a plurality of antennas according to received signal strength, comprising: an antenna switching switch unit for switching a plurality of antennas connected to a non-selected non-selected antenna. A termination circuit unit built in the antenna switch unit, and a matching circuit unit connected to the antenna switch unit, wherein the non-selected antenna does not pass through the matching circuit and the antenna switch unit And a radio terminal terminated via the termination circuit unit. 3. A wireless device using switching diversity for selecting a plurality of antennas according to received signal strength, comprising: an antenna switching switch unit for switching a plurality of antennas connected to a non-selected antenna that has not been selected. A terminating circuit unit built in the antenna switch unit; and a matching circuit unit built in the antenna switch unit, wherein the non-selected antenna does not pass through the matching circuit. And a radio terminal terminated via the termination circuit unit. 4. The wireless device according to claim 1, wherein the terminating circuit unit changes a phase of the terminating circuit according to a used frequency to create a terminating condition. 5. The wireless device according to claim 4, wherein the terminating circuit unit uses a varicap diode to change a phase of the terminating circuit in accordance with a used frequency to create a terminating condition. 6. A switch configuration method for a wireless device using switching diversity, wherein a non-selected antenna not selected based on a received signal strength is terminated via a termination circuit unit without passing through a matching circuit. A switch configuration method for a wireless device.