JP2003037520A - Radio frequency switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio frequency switch capable of meeting the duplex mode. SOLUTION: A radio frequency switch 21 is mainly constituted of ten main switching elements 22-31, a transmission pass circuit 40, a coupler 45, a low-pass filter 50, auxiliary switching elements 65-70 shunt connected. As these main switching elements 22-31, there are employed GaAs switches (MOS-FET transistors) which are easy to synchronize mutually with the ON/OFF control. For example, when a transmission port and a reception port Tx, Rx are simultaneously connected to an antenna port ANT1, the entire or a part of main switching elements 24, 27 and auxiliary switching elements 70, 65, 66 and 68 are simultaneously turned ON, and the remainder switching elements OFF.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a high frequency switch,
In particular, the present invention relates to a high-frequency switch used by being incorporated in a mobile communication device such as a mobile phone.

[0002]

2. Description of the Related Art Conventionally, as a high frequency switch compatible with antenna diversity, the one shown in FIG. 15 has been known. The high frequency switch 1 includes six switching elements 2 to 7. The transmission port Tx of the high-frequency switch 1 is electrically connected to the antenna port ANT1 via the switching element 6 and also electrically connected to the external connection port EXT1 via the switching element 7. Similarly, the reception port Rx is connected to the antenna port ANT2, the external connection port EXT2, the antenna port ANT1 and the external connection port EXT1 via the switching elements 2, 3, 4, and 5, respectively.
Electrically connected to. Antenna port ANT
1 and ANT2 are electrically connected to the antenna elements 10 and 11, respectively.

[0003]

The high frequency switch 1 turns on / off the switching elements 2 to 7, respectively.
When turned off, the transmission port Tx is connected to the antenna port ANT1 or the external connection port EXT1, and the reception port Rx is connected to the antenna port ANT.
1, ANT2 or external connection port EXT1, EXT2
Connected to. However, the conventional high-frequency switch 1
Is used in a TDMA system, and therefore antenna ports ANT1, ANT2 or external connection port EXT
When connecting 1 and EXT2 and transmission / reception ports Tx and Rx, there is a so-called single mode configuration in which only one signal transmission path is connected. Therefore, the conventional high frequency switch 1 has the transmission port Tx.
Both the reception port Rx and the reception port Rx are simultaneously connected to the antenna ports ANT1 and ANT2 and the external connection port EXT.
1, duplex connected to EXT2 (simultaneous transmission and reception)
I couldn't handle the mode.

[0004] In recent years, PDC, which has been particularly attracting attention,
(Personal Digital Cellular
In the packet communication of r), it is expected that the amount of data at the time of reception will be huge. Therefore, in order to increase the transmission amount at the time of reception, it is necessary to operate the mobile phone in the duplex (simultaneous transmission / reception communication) mode in which reception is performed simultaneously with transmission. However, as described above, since the conventional high-frequency switch 1 has a configuration in which only one signal transmission path is connected, it cannot support the duplex mode in which two signal transmission paths need to be connected at the same time. It was

SUMMARY OF THE INVENTION An object of the present invention is to provide a high frequency switch compatible with the duplex mode.

[0006]

In order to achieve the above object, a high frequency switch according to the present invention comprises (a) a transmission port and a reception port, and (b) an antenna port and an external connection port. A plurality of main switchings connected between at least one of the ports, and (c) the transmitting port and the receiving port, and at least one of the antenna port and the external connection port. An element, and (d) at least two main switching elements of the plurality of main switching elements are synchronized with ON / OFF to simultaneously turn on the at least two main switching elements, and the transmission port and the reception port A structure for simultaneously connecting at least one of the antenna port and the external connection port To have, and wherein.

GaAs switches (MOSFET transistors) or the like are used as the plurality of main switching elements. Further, a receiving side filter or the like is connected to the receiving port, and a transmitting side filter or the like is connected between the transmitting port and the plurality of main switching elements. A duplexer is configured by the reception side filter and the transmission side filter. Further, among the reception side phase correction circuit connected between the reception port and the plurality of main switching elements, and the transmission side phase correction circuit filter connected between the transmission port and the plurality of main switching elements It is preferable to include at least one phase correction circuit. Further, a low-pass filter may be connected between at least one of the antenna port and the external connection port and the plurality of main switching elements.

With the above configuration, the transmission port and the reception port can be simultaneously connected to the antenna port and the external connection port, and a high frequency switch compatible with a duplex (simultaneous transmission / reception communication) mode can be obtained.

Further, the high frequency switch according to the present invention is
(E) a transmission port and a reception port, (f) at least one port of an antenna port and an external connection port, (g) the transmission port and the reception port, and the antenna port And a plurality of main switching elements connected to at least one of the external connection ports, and (h) a main switching element connected between the transmission port and the plurality of main switching elements. A transmission side path circuit for switching a transmission signal transmission path, and (i) ON / OFF of at least two main switching elements of the plurality of main switching elements and switching of a signal transmission path of the transmission side path circuit. The feature is that the timing is synchronized.

With the above configuration, the transmission port and the reception port can be simultaneously connected to the antenna port and the external connection port, and a high frequency switch compatible with the duplex (simultaneous transmission / reception communication) mode can be obtained. Further, the transmission side path circuit has a function of dividing the transmission signal transmission path into two systems, a single mode system and a duplex mode system. Then, when transmitting in the single mode (in other words, when packet communication is not performed), the transmission signal is prevented from passing through the transmission side filter of the duplexer to suppress the loss during transmission. As a result, the gain of the power amplifier at the time of transmission can be suppressed, the current consumption can be reduced, and the battery usage amount can be suppressed.

Further, it is preferable to shunt connect an auxiliary switching element between at least one of the transmission port, the antenna port and the external connection port and the plurality of main switching elements. This auxiliary switching element prevents load fluctuation when the main switching element is OFF, and also prevents deterioration of isolation characteristics when the main switching element is OFF.

Further, a coupler having a main line connected between the transmission port and the plurality of main switching elements is further provided,
A Schottky diode may be connected to one end of the sub line of this coupler. As a result, the sub-line of the coupler couples with the transmission signal propagating through the main line, and an output (power of -10 to -20 dBc of the transmission signal) proportional thereto is taken out as a detection signal. This detection signal is fed back and used for gain control of the transmission power amplifier via an automatic gain control circuit or the like.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a high frequency switch according to the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the high frequency switch 21 corresponding to the antenna diversity generally has ten main switching elements 22 to 31, a transmission side pass circuit 40, and
The coupler 45, the low-pass filter 50, and the shunt-connected auxiliary switching elements 65 to 70 are included.

For the main switching elements 22 to 31, GaAs switches (MOS FET transistors) which are easy to synchronize ON / OFF control with each other are used. One end of the main switching element 22 is connected to the antenna port ANT2, one end of the main switching element 23 is connected to the external connection port EXT2, one end of the main switching element 24 is connected to the antenna port ANT1, and the main switching element 25 is connected. Is connected to the external connection port EXT1 via the low-pass filter 50. The other ends of the main switching elements 22 to 25 are connected to the reception port Rx.

One end of the main switching element 26 is connected to the antenna port ANT2, and the main switching element 27 is connected.
Is connected to the antenna port ANT1 and one end of the main switching element 28 is connected to the external connection port EXT1 via the low-pass filter 50. The other ends of the main switching elements 26 to 28 are connected to the duplexer port DUP1.

One end of the main switching element 29 is connected to the external connection port EXT1 via the low-pass filter 50, one end of the main switching element 30 is connected to the antenna port ANT1, and one end of the main switching element 31 is connected to the antenna port. It is connected to ANT2. The other ends of the main switching elements 29 to 31 are connected to the transmission port Tx via the transmission side path circuit 40 and the coupler 45.
It is connected to the.

Ports ANT1, ANT2, EXT1, E
A series circuit of auxiliary switching elements 65 to 70 and capacitor elements C1 to C6 is shunt-connected between XT2 and the main switching elements 22 to 31, for example. The auxiliary switching elements 65 to 70 operate in conjunction with the main switching elements 22 to 31 and the switching elements 41 and 42 of the transmission side path circuit 40, which are connected to the shunt-connected signal transmission paths. And, these shunt connection series circuits are connected to the main switching element 2
Prevents load fluctuation when 2 to 31 etc. is OFF,
Prevents deterioration of isolation characteristics.

The reception port Rx is connected to the reception side filter 36 of the duplexer 35 which is a separate component, and the transmission side filter 37 of the duplexer 35 is connected between the duplexer ports DUP1 and DUP2. Note that instead of using one duplexer 35, two filters may be used in combination.

The transmitting side pass circuit 40 is formed by connecting two switching elements 41 and 42 in an L shape. One end of the switching element 41 has a duplexer port DUP.
2 and one end of the switching element 42 is connected to the main switching elements 29 to 31. The other ends of the switching elements 41 and 42 are connected to the transmission port Tx via a coupler 45. The transmission side path circuit 40 is used to divide the transmission signal transmission path into two systems, a single mode system and a duplex mode system.

That is, as will be described in detail later, by turning off the switching element 41 and turning on the switching element 42, the transmission signal transmission path becomes a single mode system. In this case, the high frequency switch 21 has a single mode configuration, in other words, the transmission / reception port Tx,
Rx is used such that only one signal transmission path is connected to the antenna ports ANT1 and ANT2 and the external connection ports EXT1 and EXT2. In this case, since the transmission signal does not pass through the transmission filter of the duplexer, it is possible to suppress loss during transmission. On the other hand, the switching element 4
When 1 is turned on and the switching element 42 is turned off, the transmission signal transmission path becomes a duplex mode system. In this case, the high frequency switch 21 has a duplex mode configuration, in other words, both the transmission port Tx and the reception port Rx are simultaneously in the antenna port ANT.
1, ANT2 and external connection ports EXT1 and EXT2.

The coupler 45 is composed of a main line 46 and a sub line 47 electromagnetically coupled to the main line 46. The main line 46 includes the transmission port Tx and the transmission-side pass circuit 4
It is connected between 0 and. One end of the sub line 47 is terminated by a resistor R via a port P, and the other end is connected to a detection port DET via a capacitor C8 and two Schottky diodes D1 and D2.

Coupler 45 and Schottky diode D
1, D2, etc. form a power amount detection circuit for power feedback to the transmission power amplifier. That is, a transmission power amplifier (not shown) is provided on the main line 46 of the coupler 45.
The transmission signal output from is transmitted via the transmission port Tx. The sub line 47 is coupled to the transmission signal transmitted to the main line 46, takes out an output (power of -10 to -20 dBc of the transmission signal) proportional thereto, and outputs it through the detection port DET. (Not shown). The automatic gain control circuit monitors the output extracted from the sub line 47 and controls the gain of the transmission power amplifier.

The low-pass filter 50 is connected between the main switching element 28 and the external connection port EXT1. The low pass filter 50 is not always necessary and may be omitted depending on the specifications. Further, the low-pass filter may be connected between the external connection port EXT2 or the antenna ports ANT1 and ANT2 and the main switching elements 23, 27 and 22, respectively.

The reception side phase correction circuit 81 is connected between the reception port Rx and the main switching elements 22 to 25. The transmission side phase correction circuit 82 has a transmission port Tx.
(More specifically, it is connected between the duplexer port DUP1) and the main switching elements 26 to 28. The phase correction circuits 81 and 82 are configured by a distributed constant type circuit formed of a transmission line, a lumped constant type circuit formed by combining an inductor and a capacitor, or a delay line. Furthermore, the phase correction circuit is shown in FIG.
It may be appropriately provided at the position of b.

Next, transmission / reception using the high frequency switch 21 will be described. This high frequency switch 21
As shown in FIG. 1, antenna ports ANT1, ANT
2, a main antenna element 60 and a sub-antenna (built-in antenna) element 61 are connected to each other, and a data transmission device (not shown) or the like is connected to each of the external connection ports EXT1 and EXT2. On the other hand, the high frequency switch 21
PDC1500 (packet) on the receiving port Rx
Receiver circuit (not shown) is connected via the receiver filter 36 of the duplexer 35, and P is connected to the transmission port Tx.
A DC 1500 (packet) transmission circuit (not shown) is connected.

As shown in Table 1, the high-frequency switch 21 controls the ON / OFF of the switching elements 22-31, 41, 42, etc., and signals of 13 modes in total including 7 modes in single mode and 6 modes in duplex mode. It has a transmission path. The conventional high frequency switch 1 shown in FIG.
Only 5, 6 and 7 signal transmission paths in total of 6 modes can be obtained.

[0028]

[Table 1]

FIG. 2 shows a signal transmission path in the single mode 1, that is, when only the transmission port Tx and the antenna port ANT1 are connected (see the thick line in FIG. 2). In this case, all or part of the main switching element 30, the switching element 42 of the transmission side path circuit 40, and the auxiliary switching elements 69, 65, 66, 68 are turned on.
Then, the remaining switching elements are turned off. Basically, the auxiliary switching elements of unused ports are turned on. Switching element 41 to O
If it is in FF state, the signal will be the duplexer port DUP.
Although it is considered that it does not flow to port 2, it actually flows to port of duplexer DUP2. Therefore, the auxiliary switching elements 69, 65, 66, 68 are turned on. This turns off the switching element 41.
The combination of the open state and the shunt connection by turning on the auxiliary switching elements 69, 65, 66, 68 surely prevents the signal flow to the duplexer port DUP2. However, not all auxiliary switching elements 69, 65, 66,
It is not necessary to turn 68 on. In FIG. 2, the phase correction circuits 81 and 82 are omitted. Less than,
The same applies to FIGS. 3 to 14.

FIG. 3 shows a signal transmission path in the single mode 2, that is, when only the transmission port Tx and the antenna port ANT2 are connected (see the thick line in FIG. 3). In this case, all or some of the main switching element 31, the switching element 42 of the transmission side path circuit 40, and the auxiliary switching elements 69, 66, 67, 68 are turned on, and the remaining switching elements are turned off.

Further, FIG. 4 shows a signal transmission path in the single mode 3, that is, when only the transmission port Tx and the external connection port EXT1 are connected (FIG. 4).
See the thick line). In this case, all or some of the main switching element 29, the switching element 42 of the transmission side path circuit 40, and the auxiliary switching elements 69, 65, 66, 67 are turned on, and the remaining switching elements are turned off.

As described above, when transmitting in the single modes 1 to 3 (in other words, when packet communication is not performed), the switching elements 41 and 42 of the transmitting side path circuit 40 are provided.
ON / OFF control is performed to set the transmission signal transmission path to a single mode system. Thereby, the transmission signal can be prevented from passing through the transmission side filter 37 of the duplexer 35, and the loss at the time of transmission can be suppressed. As a result,
The power consumption of the transmission power amplifier can be suppressed and the talk time of the mobile phone can be lengthened.

FIG. 5 shows a signal transmission path in the single mode 4, that is, when only the receiving port Rx and the antenna port ANT1 are connected (see the thick line in FIG. 5). In this case, all or part of the main switching element 24 and the auxiliary switching elements 69, 70, 65, 66, 68 are turned on, and the remaining switching elements are turned on.
Set to FF state.

FIG. 6 shows a signal transmission path in the single mode 5, that is, when only the receiving port Rx and the antenna port ANT2 are connected (see the thick line in FIG. 6). In this case, all or some of the main switching element 22 and the auxiliary switching elements 69, 70, 66, 67, 68 are turned on, and the remaining switching elements are turned off.

Further, FIG. 7 shows a signal transmission path in the single mode 6, that is, when only the reception port Rx and the external connection port EXT1 are connected (FIG. 7).
See the thick line). In this case, all or some of the main switching element 25 and the auxiliary switching elements 69, 70, 65, 66, 67 are turned on, and the remaining switching elements are turned off.

Further, FIG. 8 shows a signal transmission path in the single mode 7, that is, when only the reception port Rx and the external connection port EXT2 are connected (FIG. 8).
See the thick line). In this case, all or some of the main switching element 23 and the auxiliary switching elements 69, 70, 65, 67, 68 are turned on, and the remaining switching elements are turned off.

FIG. 9 shows a signal transmission path in the duplex mode 1, that is, when the transmission / reception ports Rx and Tx are simultaneously connected to the antenna port ANT1 (see the thick line in FIG. 9). In this case, all or some of the main switching elements 24 and 27, the switching element 41 of the transmission side path circuit 40, and the auxiliary switching elements 70, 65, 66, and 68 are simultaneously turned on, and the remaining switching elements are turned off. .

In FIG. 10, the duplex mode 2, that is, the receiving port Rx is connected to the antenna port ANT2, and at the same time, the transmitting port Tx is connected to the antenna port A.
FIG. 11 shows a signal transmission path when it is connected to NT1 (see the thick line in FIG. 10). In this case, the main switching elements 22 and 27 and the switching element 4 of the transmission side path circuit 40
1 and all or some of the auxiliary switching elements 70, 66, 68 are turned on at the same time, and the remaining switching elements are turned off. In this case, the reception port Rx and the transmission port Tx are different antenna ports AN.
Since it is connected to T2 and ANT1, it is possible to use an isolation in the air of about 15 to 20 dB as isolation between Tx and Rx. At this time, isolation (attenuation) between Tx and Rx of the duplexer 35.
The characteristics can be assisted, and the filters 36 and 37 with smaller loss can be used as the duplexer 35.

In FIG. 11, the duplex mode 3, that is, the receiving port Rx is connected to the antenna port ANT1, and at the same time the transmitting port Tx is connected to the antenna port A.
12 shows a signal transmission path when it is connected to NT2 (see the thick line in FIG. 11). In this case, the main switching elements 24 and 26 and the switching element 4 of the transmission-side pass circuit 40
1 and all or some of the auxiliary switching elements 70, 66, 68 are turned on at the same time, and the remaining switching elements are turned off. In this case, the reception port Rx and the transmission port Tx are different antenna ports AN.
Since it is connected to T1 and ANT2, it is possible to use an isolation in the air of about 15 to 20 dB as isolation between Tx and Rx. At this time, isolation (attenuation) between Tx and Rx of the duplexer 35.
The characteristics can be assisted, and the filters 36 and 37 with smaller loss can be used as the duplexer 35.

FIG. 12 shows a signal transmission path in the duplex mode 4, that is, when the transmission / reception ports Rx and Tx are simultaneously connected to the antenna port ANT2 (see the thick line in FIG. 12). In this case, the main switching elements 22 and 26, the switching element 41 of the transmission-side pass circuit 40, and the auxiliary switching elements 70, 66, 67, and 68.
All or part of them are simultaneously turned on, and the remaining switching elements are turned off.

FIG. 13 shows a signal transmission path in the duplex mode 5, that is, when the transmission / reception ports Rx and Tx are simultaneously connected to the external connection port EXT1 (see the thick line in FIG. 13). In this case, the main switching elements 25, 28, the switching element 41 of the transmission side pass circuit 40, and the auxiliary switching elements 70, 65, 66, 67.
All or part of them are simultaneously turned on, and the remaining switching elements are turned off.

In FIG. 14, the duplex mode 6, that is, the reception port Rx is connected to the external connection port EXT2, and at the same time, the transmission port Tx is connected to the external connection port E.
15 shows a signal transmission path when connected to XT1 (see the thick line in FIG. 14). In this case, the main switching elements 23 and 28 and the switching element 4 of the transmission side pass circuit 40
1 and all or some of the auxiliary switching elements 70, 65, 67 are turned on at the same time, and the remaining switching elements are turned off.

As described above, the duplex modes 1 to 6
Turns on / off the main switching elements 22-31, etc.
By controlling, the transmission port Tx and the reception port Rx can be simultaneously connected to the antenna ports ANT1 and ANT2 and the external connection ports EXT1 and EXT2 (may be the same port). As a result,
It is possible to obtain the high frequency switch 21 that is compatible with the duplex mode.

Further, in the case where the duplex mode 2 shown in FIG. 10 and the duplex mode 3 shown in FIG. 11 are connected, the other side band (the reception signal band for the transmission signal is received through the antenna elements 60 and 61). , For the received signal, the transmission signal band) becomes an interference wave,
Due to the isolation in the air of about 15 dB, a certain amount of attenuation can be secured. The attenuation characteristic of the duplexer 35 can be reduced by the amount of this attenuation, and the loss of the duplexer 35 can be improved.
Then, even when the connection is made as in the duplex mode 2 shown in FIG. 10, the same operational effect can be obtained.

The high-frequency switch according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist thereof. For example, the high-frequency switch 21 shown in FIG. 1 may be one in which the shunt-connected auxiliary switching elements 65 to 70, the capacitors C1 to C6, the coupler 45, the low-pass filter 50 and the like are omitted. On the contrary, it may be a high frequency switch including the duplexer 35 and the resistor R.

Further, the high frequency switch according to the present invention is constructed by laminating a plurality of insulator layers, capacitor conductors and coil conductors of the low pass filter 50, conductors of the main line 46 and the sub line 47 of the coupler 45, and the like. By providing each port such as the transmission port Tx and the reception port Rx on the surface of the laminated body and mounting the GaAs switches of the main switching elements 22 to 31, a laminated structure can be obtained. Also, the GaAs switch has a plurality of control terminals, and I
C may be mounted. In this case, a simplified control signal group is sufficient as the input to this control IC.

[0047]

As is apparent from the above description, according to the present invention, the transmitting port and the receiving port can be simultaneously connected to the antenna port and the external connection port. As a result, a high frequency switch compatible with the duplex mode can be obtained. Further, the transmission side path circuit has a function of dividing the transmission signal transmission path into two systems, a single mode system and a duplex mode system. Then, when transmitting in the single mode (in other words, when packet communication is not performed), the transmission signal is prevented from passing through the transmission side filter of the duplexer, so that the loss at the time of transmission can be suppressed. As a result, the gain of the power amplifier at the time of transmission can be suppressed, the current consumption can be reduced, and the battery usage amount can be suppressed.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of a high frequency switch according to the present invention.

FIG. 2 is an electric circuit diagram for explaining the operation of the high frequency switch shown in FIG.

FIG. 3 is an electrical circuit diagram for explaining another operation of the high frequency switch shown in FIG.

4 is an electric circuit diagram for explaining still another operation of the high frequency switch shown in FIG.

5 is an electric circuit diagram for explaining still another operation of the high frequency switch shown in FIG.

6 is an electric circuit diagram for explaining still another operation of the high frequency switch shown in FIG.

FIG. 7 is an electric circuit diagram for explaining still another operation of the high frequency switch shown in FIG.

8 is an electric circuit diagram for explaining still another operation of the high frequency switch shown in FIG.

9 is an electric circuit diagram for explaining still another operation of the high frequency switch shown in FIG.

10 is an electric circuit diagram for explaining still another operation of the high frequency switch shown in FIG.

11 is an electric circuit diagram for explaining still another operation of the high frequency switch shown in FIG.

12 is an electric circuit diagram for explaining still another operation of the high frequency switch shown in FIG.

FIG. 13 is an electric circuit diagram for explaining still another operation of the high frequency switch shown in FIG.

FIG. 14 is an electric circuit diagram for explaining still another operation of the high frequency switch shown in FIG.

FIG. 15 is an electric circuit diagram showing a conventional high frequency switch.

[Explanation of symbols]

21 ... High frequency switch 22 to 31 ... Main switching element 35 ... Duplexer 36 ... Receiving side filter 37 ... Transmitter filter 40 ... Transmission side path circuit 41, 42 ... Switching element 45 ... Coupler 46 ... Main track 47 ... Sub track 50 ... Low-pass filter 65-70 ... Auxiliary switching element 81 ... Receiving side phase correction circuit 82 ... Transmission side phase correction circuit Rx ... Receiving port Tx ... Transmission port ANT1, ANT2 ... Antenna port EXT1, EXT2 ... External connection port DUP1, DUP2 ... Duplexer port D1, D2 ... Schottky diode

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Haruyo Bandai             2-10-10 Tenjin, Nagaokakyo, Kyoto Stock             Murata Manufacturing Co., Ltd. F term (reference) 5K011 DA02 JA01 KA02 KA03

Claims (9)

[Claims] 1. A transmission port and a reception port, at least one of an antenna port and an external connection port, the transmission port and the reception port, the antenna port and an external connection A plurality of main switching elements connected to at least one of the ports, and synchronizing at least two main switching elements of the plurality of main switching elements with ON / OFF. High frequency, characterized in that it has a configuration in which two main switching elements are simultaneously turned on and the transmission port and the reception port are simultaneously connected to at least one of the antenna port and the external connection port. switch. 2. A transmission port and a reception port, at least one of an antenna port and an external connection port, the transmission port and the reception port, and the antenna port and the external connection. A plurality of main switching elements connected between at least one of the ports, and between the transmission port and the plurality of main switching elements for switching between two transmission signal transmission paths And the ON / OFF of at least two main switching elements of the plurality of main switching elements and the switching timing of the signal transmission path of the transmission side path circuit are synchronized. And high frequency switch. 3. An auxiliary switching element is shunt-connected between at least one of the transmission port, the antenna port, and the external connection port and the plurality of main switching elements. The high frequency switch according to claim 1 or 2, which is characterized. 4. The high frequency switch according to claim 1, further comprising a coupler in which a main line is connected between the transmission port and the plurality of main switching elements. 5. The high frequency switch according to claim 4, wherein a Schottky diode is connected to one end of the sub line of the coupler. 6. A low-pass filter is connected between at least one of the antenna port and the external connection port and the plurality of main switching elements. Item 6. The high frequency switch according to any one of items 5. 7. A reception side filter connected to the reception port, and at least one filter of a transmission side filter connected between the transmission port and the plurality of main switching elements. The high frequency switch according to any one of claims 1 to 6. 8. A receiving side phase correction circuit connected between the reception port and the plurality of main switching elements, and a transmission connected between the transmission port and the plurality of main switching elements. The high frequency switch according to claim 1, further comprising at least one phase correction circuit of the side phase correction circuit filter. 9. The plurality of main switching elements are GaA.
9. An s switch, wherein the switch is an s switch.
The high frequency switch described in any one of 1.