JP2002335104A - Antenna multicoupler and mobile communications equipment using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna multicoupler, which can solve the problem of the loss in the conventional antenna multicoupler becoming larger, when a system using a frequency dividing method in which transmission and reception are made simultaneously and another system which does not make simultaneous transmission and reception exists in the multicoupler. SOLUTION: This antenna multicoupler is provided with an antenna terminal 401, a transmission-side phase-shift circuit 403 and a reception-side phase-shift circuit 406 connected to the terminal 401, and a transmission filter 404 connected to the circuit 403 and a transmission terminal 405; the multicoupler is also provided with a reception filter 407, connected to the circuit 406 and a reception terminal 408; the transmission filter 404 is a composite filter, which is constituted to have an attenuation pole and to work as a multicoupler by respectively controlling the impedances of the phase shift circuits 403 and 406 by means of the circuits 403 and 406, when the multicoupler makes simultaneous transmission and reception; and when the multicoupler does not conduct simultaneous transmission and reception, attenuation pole is removed from the filter 404.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna duplexer capable of separating a transmission signal and a reception signal of, for example, a mobile phone, and a mobile communication device.

[0002]

2. Description of the Related Art In recent years, a frequency division system capable of simultaneous transmission and reception has been used in systems such as CDMA in mobile communication equipment, and has been receiving attention from the viewpoint of expanding the amount of transmission information such as data communication. In order to enable such simultaneous transmission and reception, a duplexer that separates a transmission signal from a reception signal is widely used, and for mobile communication devices such as mobile phones, miniaturization and high performance are realized. for,
Attention has been paid to miniaturization and low loss of duplexers.

[0003] For systems that do not transmit and receive simultaneously, such as GSM, changeover switches are widely used.
In this regard, a semiconductor IC and a pin diode configuration have realized a small size and low loss, but are not suitable for a simultaneous transmission / reception system.

An example of a conventional duplexer will be described below with reference to the drawings. FIG. 10 shows an equivalent circuit diagram of a conventional duplexer.

In FIG. 10, a duplexer 1001 includes a transmission filter 1002 which is a low-pass filter (LPF) disposed on the transmission side, a reception filter 1003 which is a band-pass filter (BPF) disposed on the reception side, and an antenna terminal. (ANT) 1004, a transmission terminal (Tx) 1005, and a reception terminal (Rx) 1006. Transmission filter 1002, reception filter 1003 and antenna terminal 10
04 is connected via a common terminal 1007. The transmission signal input from the transmission terminal 1005 is
2 to the antenna terminal 1004.

At this time, since the impedance of the transmission frequency band when the bandpass filter 1003 on the receiving side is viewed from the common terminal 1007 is ideally adjusted to the open state, the transmission signal is transmitted to the reception terminal 1006. There is no. A reception signal input from the antenna terminal 1004 is transmitted to the reception terminal 1006 via the band-pass filter 1003 on the reception side. At this time, the common terminal 1007
Since the impedance of the reception frequency band when the low-pass filter 1002 on the transmission side is viewed from above is ideally adjusted to the open state, the reception signal is not transmitted to the transmission terminal 1005.

[0007]

However, when the above-described configuration is used in a case where a system using a frequency division system which is a simultaneous transmission and reception and a system which is not a simultaneous transmission and reception are mixed, compared with the case where a changeover switch is used. There was a problem that the loss increased.

An object of the present invention is to provide an antenna duplexer and a mobile communication device which can be used in a system in which simultaneous transmission and non-simultaneous transmission and reception are mixed in consideration of the above problems.

[0009]

In order to solve the above-mentioned problems, a first invention (corresponding to claim 1) comprises an antenna terminal and a transmission phase shifter having one connected to the antenna terminal side. A circuit, a reception phase shift circuit having one connected to the antenna terminal side, a transmission filter connected to the other and transmission terminals of the transmission phase shift circuit, and a transmission filter connected to the other and reception terminals of the reception phase shift circuit. The transmission filter is a composite filter, the composite filter has a characteristic having an attenuation pole at the time of simultaneous transmission and reception to perform transmission and reception simultaneously, the transmission phase shift circuit and the reception An antenna duplexer that operates as a duplexer by controlling the respective impedances by a phase shift circuit, and has a characteristic in which the attenuation pole is removed during non-simultaneous transmission and reception in which transmission and reception are not performed simultaneously. .

Further, the second invention (corresponding to claim 2)
An antenna terminal, an antenna switch connected to the antenna terminal, a transmission phase shift circuit connected to one terminal of the antenna switch, and a reception phase shift circuit connected to the other terminal of the antenna switch. A transmission filter connected to the other of the transmission phase shift circuit and a transmission terminal,
A reception filter connected to the other of the reception phase shift circuit and a reception terminal, and when performing non-simultaneous transmission and reception that does not simultaneously perform transmission and reception, the antenna switch electrically connects the antenna terminal to the one terminal. The operation of connecting to the antenna terminal and the operation of electrically connecting the antenna terminal to the other terminal perform an operation of switching in a time-division manner, and at the time of simultaneous transmission and reception to simultaneously perform transmission and reception, the antenna switch includes: An antenna duplexer that performs an operation of electrically connecting an antenna terminal to the one terminal and the other terminal simultaneously.

Further, a third aspect of the present invention (corresponding to claim 3)
The transmission filter is a composite filter, and the composite filter has a characteristic having an attenuation pole during the simultaneous transmission and reception, and controls the respective impedances by the transmission phase shift circuit and the reception phase shift circuit. The antenna duplexer according to the ninth aspect of the present invention that operates as a duplexer and has a characteristic in which the attenuation pole is removed during the non-simultaneous transmission and reception.

Further, the fourth invention (corresponding to claim 4)
The antenna switch according to the second or third aspect of the present invention, wherein the antenna switch is integrated with another switch connected to the antenna terminal.

Further, the fifth invention (corresponding to claim 5)
Is an antenna duplexer having a structure using a laminated filter using a dielectric green sheet, wherein at least one of the transmission filter and the reception filter is built in the laminated filter, A second or third antenna duplexer according to the present invention, wherein the switch is mounted on an upper surface of a filter.

Further, a sixth aspect of the present invention (corresponding to claim 6)
Is the antenna duplexer according to the second or third aspect of the present invention, wherein the reception filter is a surface acoustic wave filter.

A seventh aspect of the present invention (corresponding to claim 7)
The third aspect is the antenna duplexer according to the second or third aspect, wherein the third filter is the composite filter according to the aspect of the invention.

An eighth aspect of the present invention (corresponding to claim 8)
Is the antenna duplexer according to the second or third aspect of the present invention in which the output level of a transmission amplifier connected directly or indirectly to the transmission terminal is increased during the simultaneous transmission and reception.

The ninth invention (corresponding to claim 9)
In the antenna duplexer according to an eighth aspect of the present invention, the adjustment for increasing the output level of the transmission amplifier is performed by increasing the power supply voltage of the transmission amplifier.

According to a tenth aspect of the present invention (corresponding to claim 10), the composite filter has an input terminal, an output terminal, at least one transmission circuit, and at least two or more switching notch filters. The transmission circuit is electrically connected between the input terminal and the output terminal, and the switching notch filter is connected to each of an input side and an output side of the transmission circuit, and the switching notch filter Has at least one switch and at least one series resonance circuit, one end of the switch is connected between the input terminal and the output terminal, and the other end of the switch is connected to the series resonance circuit. The first, third and seventh switches are connected to one end, and the other end of the series resonator is grounded or not grounded, and the switch has a control terminal for switching ON / OFF. Is any antenna duplexer of the present invention.

According to an eleventh aspect of the present invention (corresponding to claim 11), when the switch is in an ON state, the passing characteristic from the input terminal to the output terminal is equal to the characteristic of the transmission circuit and the characteristic of the switching notch filter. A characteristic in which a characteristic having an attenuation pole formed by a series resonance circuit is superimposed,
The tenth aspect of the present invention is an antenna duplexer according to the tenth aspect of the present invention, wherein when the switch is in an OFF state, a transmission characteristic from the input terminal to the output terminal substantially becomes a characteristic of a transmission circuit.

A twelfth invention (corresponding to claim 12) is the antenna duplexer according to the tenth invention, wherein the transmission circuit has a circuit configuration having a filter function.

A thirteenth aspect of the present invention (corresponding to claim 13) is the antenna duplexer according to the tenth aspect of the present invention, wherein the transmission circuit is constituted by connecting capacitors in series.

A fourteenth aspect of the present invention (corresponding to claim 14) is the antenna duplexer according to the tenth aspect of the present invention, wherein the transmission circuit is constituted by a strip line of a capacitor.

According to a fifteenth aspect of the present invention (corresponding to claim 15), the antenna duplexer has a structure using a laminated filter using a dielectric green sheet, and the switching notch filter comprises An antenna duplexer according to a tenth aspect of the present invention, wherein the switch is mounted on a top surface of the multilayer filter and is incorporated in a filter.

According to a sixteenth aspect of the present invention (corresponding to claim 16), at the time of the simultaneous transmission and reception, the antenna switch electrically connects the antenna terminal, the one terminal and the other terminal by the same control signal. Connection operation and turning on the switch of the switching notch filter of the composite filter
An antenna duplexer according to a tenth aspect of the present invention which performs the following operations.

Also, in the seventeenth invention (corresponding to claim 17), at the time of the non-simultaneous transmission / reception, the antenna switch is connected to the one terminal or the other terminal from the antenna terminal by the same control signal. An antenna duplexer according to a tenth aspect of the present invention, characterized by performing an operation of separating electrical connection by time division and an operation of turning off a switch of a switching notch filter of the composite filter.

According to an eighteenth aspect of the present invention (corresponding to claim 18), when the switch is ON, the series resonance circuit has a characteristic having an attenuation pole, and the switch is OFF.
At this time, the series resonance circuit is electrically disconnected from a portion between the input terminal and the output terminal, and a tenth characteristic in which a transmission characteristic from the input terminal to the output terminal is substantially a characteristic of a transmission circuit. It is an antenna duplexer of the present invention.

A nineteenth aspect of the present invention (corresponding to claim 19) is the antenna duplexer of the tenth aspect of the present invention, wherein an FET is used for the switch. (Corresponding to Item 20) is an antenna duplexer according to a tenth aspect of the present invention in which a pin diode is used for the switch.

A twenty-first aspect of the present invention (corresponding to claim 21) is the antenna duplexer according to the tenth aspect of the present invention, wherein the switch uses a pin diode and a quarter wavelength line.

A twenty-second invention (corresponding to claim 22) is the antenna duplexer according to the tenth invention, wherein the series resonance circuit has a configuration in which a capacitor and a resonator are connected in series.

A twenty-third aspect of the present invention (corresponding to claim 23) is the antenna duplexer according to the tenth aspect of the present invention, wherein the series resonance circuit has a configuration in which an inductor and a resonator are connected in series.

According to a twenty-fourth aspect of the present invention (corresponding to claim 24), the series resonant circuit has a configuration in which a circuit in which a capacitor and an inductor are connected in parallel and a resonator are connected in series. Of the present invention.

A twenty-fifth invention (corresponding to claim 25) is the antenna duplexer according to the tenth invention, wherein the series resonance circuit is a surface acoustic wave filter.

According to a twenty-sixth aspect of the present invention (corresponding to claim 26), the composite filter includes an input terminal, an output terminal, and at least one switching notch filter connected to the input terminal and the output terminal. And the switching notch filter has two switches connected to the input terminal and the output terminal, respectively. Between the two switches, a notch filter and a transmission circuit having predetermined characteristics are provided. The notch filter and the transmission circuit having the predetermined characteristic, which are connected in parallel, are an antenna duplexer according to a tenth aspect of the present invention that can be switched by the switch.

A twenty-seventh aspect of the present invention (corresponding to claim 27) is the antenna duplexer according to the twenty-sixth aspect of the present invention, wherein the notch filter is a surface acoustic wave filter.

Further, a twenty-eighth aspect of the present invention (corresponding to claim 28) is a mobile communication device that supports simultaneous transmission and reception in which transmission and reception are performed simultaneously and non-simultaneous transmission and reception in which transmission and reception are not performed simultaneously. A mobile communication device including an antenna connection circuit, wherein the antenna connection circuit uses the antenna duplexer of the first invention.

A twenty-ninth aspect of the present invention (corresponding to claim 29) is a mobile communication device that supports simultaneous transmission and reception for simultaneously performing transmission and reception, and non-simultaneous transmission and reception that does not simultaneously perform transmission and reception. In the case of the non-simultaneous transmission / reception, an antenna connection circuit that operates as a transmission / reception switch having a filter on the transmission side and the reception side, and operates as a duplexer in the case of simultaneous transmission / reception, the antenna connection circuit includes: A mobile communication device using the antenna sharing device of the second aspect of the present invention.

[0037]

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

(Embodiment 1) In Embodiment 1, various composite filters that can be used as components of the antenna duplexer described in Embodiment 2 and thereafter will be described.

FIG. 1 is a schematic diagram of a composite filter according to the first embodiment.

The composite filter shown in FIG. 1 includes a low-pass filter 101 as a transmission circuit and first and second switching notch filters 102 and 103. The low-pass filter 101 includes the first and second capacitors 10.
This is a π-type circuit composed of 4, 105 and an inductor 106. Also, the first switching notch filter 102
Is connected to a first switch 107, a first capacitor 108, and a first resonator 109 in series.
One end of 9 is grounded. The second switching notch filter 103 includes a second switch 110 and a second capacitor 11
The first and second resonators 112 are connected in series, and one end of the second resonator 112 is grounded.

Here, the first resonator 109 is a line having a length of λ / 4, and a series resonance circuit is formed by the capacitor 108 and the resonator 109, and 102 is a switching notch filter. Similarly, the second resonator 112 is a line having a length of λ / 4, a series resonance circuit is formed by the capacitor 111 and the resonator 112, and 103 is a switching notch filter.

When the first resonator 109 is a λ / 2 line, one end of the resonator 109 is open. Similarly, when the second resonator 112 is a λ / 2 line, one end of the resonator 112 is open.

The first switching notch filter 102 is connected between the output terminal 113 and the low-pass filter 101. The second switching notch filter 103 has an input terminal 114
And the low-pass filter 101. Further, the first and second switching notch filters 102, 10
3 is adjusted so that the attenuation pole is located at a desired frequency. Further, first and second control terminals 115 and 116 are connected to the first and second switching notch filters 102 and 103, respectively, and the first and second control terminals 115 and 116 are connected to the first and second control terminals 115 and 116, respectively. , And the ON / OF state of the first and second switches 107 and 110 constituting the second switching notch filters 102 and 103 are controlled.

In the above composite filter, when the first and second switches 107 and 110 are ON, the pass characteristic from the input terminal 113 to the output terminal 114 is equal to that of the low-pass filter 101 which is a transmission circuit. Characteristics and capacitors 108 and 11 of switching notch filters 102 and 103
1 and the characteristic having the attenuation pole formed by the resonators 109 and 112 are superposed, so that the composite filter becomes a low-pass filter having the attenuation pole, and it is possible to secure the attenuation at the desired frequency. . In the composite filter, the first and second switches 107, 1
When 10 is in the OFF state, the capacitors 108, 1
11 and the resonators 109 and 112 are connected to the input terminal 11
3 and the output terminal 114 are electrically disconnected from each other,
Since the pass characteristic from the input terminal 113 to the output terminal 114 is almost directly coupled, the composite filter is simply a low-pass filter, and the loss in the pass band can be reduced.

As described above, the composite filter according to the present embodiment can ensure an attenuation at a desired frequency, and can further reduce the loss of the pass band by switching the notch.

In this embodiment, FIG.
As shown in FIG.
, A capacitor 201 may be used. In this case, when the switches 107 and 110 are ON,
A composite filter having an attenuation pole is formed, and the switch 1
When the switches 07 and 110 are in the OFF state, the switching notch filter is disconnected from the signal path, and the input terminal 113 and the output terminal 1 are not connected.
Reference numeral 14 is configured to be connected via a capacitor, and further reduction in loss can be realized. Further, the output terminal 113 and the input terminal 114 may be directly connected using a strip line or the like as a transmission circuit without disposing the capacitor 201.

When only one switching notch filter is used, the input terminal 114 and the output terminal 113 may be connected without passing through a transmission circuit as shown in FIG. 2B.

In place of the first switching notch filter 102 and the second switching notch filter 103, those having the configuration shown in FIG. 11 can be used. That is, the switching notch filter 102a shown in FIG.
Has a configuration in which the capacitor 108 of the switching notch filter 102 shown in FIG. 1 is replaced with an inductor 108a.
That is, the switching notch filter 102 shown in FIG.
In a, the switch 107, the inductor 108a, and the resonator 109 are connected in series, a series resonance circuit is formed by the inductor 108a and the resonator 109, and one end of the resonator 109 is grounded. Further, a control terminal 115 is connected to the switch 107.

The switching notch filter 102b shown in FIG. 11B is a switching notch filter 10b shown in FIG.
In this configuration, the second capacitor 108 is replaced with a circuit in which a capacitor 108b and an inductor 108c are connected in parallel. That is, in the switching notch filter 102b of FIG. 11B, a circuit in which a capacitor 108b and an inductor 108c are connected in parallel between the switch 107 and the resonator 109 is connected. Is grounded. Further, a control terminal 115 is connected to the switch 107.

The switching notch filter 102c shown in FIG. 11C has a configuration in which a resonance circuit composed of the capacitor 108 and the resonator 109 of the switching notch filter 102 in FIG. It is. That is, the switching notch filter 1 shown in FIG.
02c indicates that the switch 107 has a surface acoustic wave filter 110
8 is connected, and the control terminal 115 is connected to the switch 107.

As described above, the switching notch filter 102a,
The same effect as that of the present embodiment can be obtained by using 102b and 102c instead of the first switching notch filter 102 and the second switching notch filter 103 in FIG.

When the transmission circuit is constituted by a plurality of stages of low-pass filters, the transmission circuit is provided between two adjacent low-pass filters and between the output terminal and the low-pass filter adjacent to the output terminal. , And a switching notch filter is connected between the input terminal and the low-pass filter adjacent to the input terminal. In the case where the transmission circuit is composed of a plurality of stages of low-pass filters, between the two adjacent low-pass filters and between the output terminal and the output terminal and the adjacent low-pass filter. And a notch filter may be connected between the input terminal and the low-pass filter adjacent to the input terminal. In addition, the present invention is not limited to this. Between two adjacent low-pass filters, between the output terminal and the output terminal and the adjacent low-pass filter, and between the input terminal and the input terminal and the adjacent low-pass filter. A configuration in which a switching notch filter is connected to only a part of the space between the switching notch filters is also possible.

In the present embodiment, the first and second
The switches 107 and 110 of FIG. 3 may be constituted by a semiconductor element such as an FET shown in FIG.
The configuration using the pin diodes shown in (b) and (c) may be used. Further, even in other configurations, the effects of the high attenuation and the low loss of the present embodiment are the same as long as the configuration has a switch function. In FIG.
Each IN terminal is connected to the low-pass filter 10 in FIG.
1 and the OUT terminal is the side connected to the capacitor 108 or 111 in FIG.

FIG. 3A shows an example of a switch using an FET. The FET 301 is turned ON / OFF by the voltage of a control terminal 302.

FIG. 3B shows an example of a switch using a pin diode. The pin diode is turned on / off by the voltage of the control terminal 304 and operates as a switch. In FIG. 3B, the inductor 305,
306 has a role as a choke coil.

FIG. 3C shows an example of a switch using a pin diode and a λ / 4 line.
The voltage of 7 is supplied to the pin diode 310 via the inductor 308 and the λ / 4 line 309. The cathode of the pin diode is grounded, and when a control voltage is applied to turn on the pin diode, the λ / 4 line 3
By 09, the impedance from IN to OUT becomes infinite, and the switch is turned off. When no control voltage is applied, the switch is turned on. The λ / 4 line 309 may have a configuration using a strip line or a configuration using a lumped constant element such as an inductor.

In the present embodiment, the composite filter is described using a π-type low-pass filter. However, this is not limited to other configurations, a band-pass filter, a high-pass filter, and a laminated planar using a strip line. Even with a filter, the same effect as in the present embodiment can be obtained. Also, the number and configuration of the switching notch filters are not limited to this, and the same effect as that of the present embodiment can be obtained if the configuration is such that the ON / OFF of the notch is switched by a switch.

The frequency of the attenuation pole of the composite filter in this embodiment can be controlled by the first and second switching notch filters, and the magnitude of attenuation and the bandwidth of attenuation can be made variable. Can be.

When the first and second control terminals 115 and 116 control ON / OF at the same time, the attenuation pole of the first switching notch filter 102 and the attenuation of the second switching notch filter 103 A switching notch filter having a pole is obtained, and when either one of the first and second control terminals 115 and 116 is controlled, the attenuation pole of the first switching notch filter 102 or the second switching notch filter A switching notch filter having one of the 103 attenuation poles is obtained,
These can be controlled depending on the application and the actual use state.

Further, regarding the configuration of the composite filter of the present embodiment, even if a configuration using a dielectric coaxial resonator as the resonator forming the switching notch filter, a distributed constant type line or a dielectric sheet is used. A laminated structure may be used. Also, a lumped constant type configuration using an inductor, a capacitor, or the like may be used. In the case of a laminated structure, a further reduction in size is realized by forming passive components such as resonators and capacitors on the inner layer and mounting active components such as switches on the upper surface thereof.

Further, in the composite filter of the present embodiment, the number and the configuration of the resonators required for the notch are not limited to those described above.
With the configuration of switching OFF, the effect of the present embodiment can be similarly obtained.

FIG. 12 shows a composite filter having a configuration different from the above-described composite filter. The composite filter having the configuration of FIG. 12 can be used as a component of the antenna duplexer described in the second and subsequent embodiments, similarly to the composite filter described above.

The composite filter shown in FIG.
13 is connected to a first switch 1207, the output terminal 114 is connected to a second switch 1210, and between the first switch 1207 and the second switch 1210,
In this configuration, a transmission circuit 1222 and a notch filter 1221 are connected. Switch 1207 and switch 1
A control terminal 1215 and a control terminal 1216 are connected to 210, respectively. Here, by using a surface acoustic wave filter as the notch filter 1221, the composite filter of FIG. 12 can be further reduced in size.

In the above composite filter, when the first and second switches 1207 and 1210 are turned on to the BEF side, the pass characteristic from the input terminal 113 to the output terminal 114 becomes the characteristic of the notch filter 1221. The composite filter has a characteristic having an attenuation pole, and it is possible to secure an attenuation amount at a desired frequency. In the composite filter, the first and second switches 10
When the transmission circuits 7 and 110 are in the ON state on the transmission circuit side, the transmission characteristics to the input terminal 113 and the output terminal 114 become the characteristics of the transmission circuit, and when the transmission circuit is a capacitor or a low-pass filter, the complex The filter can reduce the passband loss without having an attenuation pole.

As described above, the composite filter according to the present embodiment can ensure an attenuation at a desired frequency, and can further reduce the loss of the pass band by switching the notch.

Embodiment 2 Hereinafter, an antenna duplexer according to Embodiment 2 of the present invention will be described with reference to the drawings. The antenna duplexer according to the second embodiment uses the various composite filters described in the first embodiment as one component thereof.

FIG. 4 is a schematic diagram of an antenna duplexer according to the second embodiment.

In FIG. 4, an antenna terminal (ANT) 4
01 is connected to a transmission terminal (Tx) 405 via an antenna switch (ANT-SW) 402, a transmission side phase shift circuit (φ) 403, and a composite filter 404 as a transmission filter. An antenna terminal (ANT) 401 is connected to a reception terminal (Rx) 408 via an antenna switch 402, a reception-side phase shift circuit (φ) 406, and a band-pass filter (BPF) 407 as a reception filter. The antenna switch 402 is connected to an antenna control terminal 409 for performing switch control. Further, a control terminal 410 is connected to the composite filter 404.

In FIG. 4, when the complex filter described in the first embodiment is used as a transmission filter and the system performs non-simultaneous transmission / reception, the antenna switch 402 switches transmission / reception signals in a time division manner. At this time, the composite filter 4
The switching notch filter having the attenuation pole of 04 is separated and turned off, and the composite filter 404 becomes a low-pass filter (LPF).

When the system performs simultaneous transmission and reception, the antenna switch 402 connects the antenna terminal 401, the transmission-side phase shift circuit 403, and the reception-side phase shift circuit 406. At this time, by turning on the composite filter 404, a low-pass filter (L
PF). At this time, the transmission-side phase shift circuit 403
Is adjusted so that the impedance of the reception band when the transmission side is viewed from the reception side of the antenna switch 402 is open. The reception-side phase shift circuit 406 is adjusted so that the impedance of the transmission band when the reception side is viewed from the transmission side of the antenna switch 402 is open.

In the above description of FIG. 4, the case of the composite filter 404 shown in the first embodiment as the transmission filter has been described, but the present embodiment is not limited to this.
A normal low-pass filter, band-pass filter, or the like may be used.

Next, the details of the composite filter 404 in FIG. 4 will be described. The composite filter 404 has the configuration shown in FIG. 1 in the first embodiment, and the first and second switching notch filters 102 and 103 are provided with desired configurations. The adjustment is performed so that the attenuation pole is located at the frequency. In this case, the configuration is such that the attenuation pole is located in the reception frequency band of the system. In the composite filter 404, when the system performs simultaneous transmission and reception, the first and second switches 107 and 110 are turned on, the composite filter 404 becomes a low-pass filter having a notch characteristic, and leakage of a transmission signal to a receiving side. Can be reduced.

In the composite filter 404, when the system performs non-simultaneous transmission and reception, the first and second switches 107 and 110 are turned off, and the composite filter 40 is turned off.
Reference numeral 4 denotes a simple low-pass filter, which can reduce the loss in the pass band.

FIG. 5 schematically shows the configuration of the antenna duplexer at the time of simultaneous transmission and reception and non-simultaneous transmission and reception. FIG. 5 (a)
Is the configuration of the antenna duplexer at the time of non-simultaneous transmission and reception,
FIG. 5B is a schematic diagram of the configuration of the antenna duplexer at the time of simultaneous transmission and reception. For example, in a PDC system, the frequency relationship between transmission and reception is as shown in the characteristic outline of FIG. As shown in FIG. 5A, in the case of non-simultaneous transmission / reception,
The composite filter 404 is a low-pass filter, and the antenna duplexer is a switch filter configured to switch the signal path in a time division manner between the low-pass filter 501 on the transmitting side and the band-pass filter 407 on the receiving side by the antenna switch 502. . At this time, the switch of the switching notch filter is turned off, and the characteristic is such that a transmission frequency as shown in FIG. 5A is passed and a higher frequency is attenuated.

Further, as shown in FIG. 5B, in the case of simultaneous transmission and reception, the switch of the switching notch filter is turned ON, so that the composite filter 404 becomes a low-pass filter 503 having an attenuation pole, and the antenna duplexer is The configuration has a low-pass filter 503 having an attenuation pole on the transmission side and a band-pass filter 407 on the reception side. At this time, the antenna switch 504 is configured to connect the antenna terminal to all of the transmitting side and the receiving side. At this time, the characteristics of the switching notch filter are such that a transmission frequency as shown in FIG. 5B is passed, a higher frequency is attenuated, and an attenuation pole is provided in a reception frequency band. However, here, the switching notch filter of the composite filter 404 is shown in FIG.
The configuration shown in FIG.

FIG. 6A shows an example of the configuration of the antenna switch. The antenna terminal 601 is connected to the first internal switch 60.
2 to the transmission side 603. The antenna terminal 601 is connected to the receiving side 605 via the second internal switch 604. First and second antenna control terminals 606 and 607 are connected to the first and second internal switches, respectively. The antenna switch includes first and second antenna control terminals 60.
6 and 607, it operates as the antenna switch 502 shown in FIG.
Antenna control terminals 606 and 607
By setting the state to N, the antenna operates as the antenna switch 504 illustrated in FIG.

Further, it is preferable that the control terminals of the antenna switch and the switching notch filter have an interlocked control system. For example, FIG.
The configuration shown in FIG. 2B can be used in common and controlled simultaneously. FIG. 6B shows a configuration in which an ON signal is sent to the first and second control terminals of the composite filter 404 when both the first and second antenna control terminals are in the ON state. Here, assuming that the first and second control terminals are common,
The control terminal input to the composite filter 404 is 1
It is a book. With such a configuration, the number of control terminals can be reduced, and the size of the circuit can be reduced, and the control signal lines can be reduced when used in a mobile communication device or the like.

As described above, the present invention has a low loss characteristic at the time of non-simultaneous reception and a transmission / reception at the time of simultaneous transmission / reception by controlling the switch for separating transmission / reception signals and the switching notch filter arranged on the transmission side. This makes it possible to realize a small antenna duplexer that increases the amount of attenuation between the antennas, and further downsize the mobile communication device.

The number of control terminals, the number of switching notch filters, and the configuration of the antenna switch described in the present embodiment are not limited to those described above, but may be adapted to the system and desired characteristics.

In the present embodiment, the composite filter 404 has been described using a π-type low-pass filter. However, this is another configuration, a band-pass filter, and a laminated planar filter using a strip line. The same effect as the present invention can be obtained. Further, the number and configuration of the switching notch filters are not limited to this, and the effect of the present invention can be similarly obtained if the notch is switched ON / OFF by a switch.

The composite filter 404 has been described using a π-type low-pass filter. However, the composite filter 404 has a configuration using a capacitor as shown in FIG. Output terminal 113 and input terminal 11
4 may be directly connected. In this case, further reduction in loss can be realized. When the switching notch filter is one of 102 and 103, the input terminal 114 and the output terminal 113 may be connected without passing through a transmission circuit as shown in FIG. 2B.

The band pass filter 407 on the receiving side may be a band element filter or other filter characteristics.
Regarding the configuration, a surface acoustic wave filter or a filter using a dielectric may be used. When a surface acoustic wave filter is used, small size and high attenuation characteristics can be realized, and high performance of a mobile communication device can be realized.

In the present embodiment, the switch 4
02 may be configured by a semiconductor IC or a configuration using a pin diode.

The phase shift circuit shown in the present embodiment may have a configuration using a strip line or a configuration using a lumped element such as an inductor.

In the case of simultaneous transmission / reception, the loss is slightly larger than that in the case of non-simultaneous transmission / reception due to the addition of the switching notch filter to the low-pass filter on the transmission side. By adjusting the level, the output level transmitted to the antenna terminal can be set to a desired level. It is desirable that the output level of the transmission amplifier be adjusted by increasing the power supply voltage of the transmission amplifier in consideration of efficiency and the like.

In this embodiment, the configuration in which the antenna duplexer is provided with the antenna switch (ANT-SW) 402 controlled by a signal from the control terminal has been described, but the antenna switch (AVT-SW) 40
2 may not be provided. That is,
The connection between the antenna terminal 504 and the transmission-side phase shift circuit and the reception-side phase shift circuit is always the configuration shown in FIG.
03 performs the same operation as the operation of the present embodiment. Even in such a case, the impedance seen from the antenna terminal to the transmission-side phase shift circuit is open at the reception frequency, and the impedance seen from the antenna terminal to the reception-side phase shift circuit at the transmission frequency is open. Thus, if the transmission-side phase shift circuit and the reception-side phase shift circuit are respectively adjusted, the same effect as that of the present embodiment can be obtained.

The transmission / reception phase circuit may be incorporated in a transmission / reception filter. This phase circuit adjusts the impedance, and the same effect as that of the present invention can be obtained as long as it operates as a duplexer.

(Embodiment 3) Next, the configuration of an antenna duplexer according to Embodiment 3 of the present invention will be described. FIG.
Is a configuration diagram of the antenna duplexer. The antenna duplexer 701 includes an antenna switch 70 for separating transmission / reception signals on the upper surface of a multilayer filter 702 made of a dielectric material.
3, first and second switches 704 and 705 constituting a switching notch filter, and a surface acoustic wave filter 706 disposed on the receiving side. Elements of a transmission-side phase shift circuit, a reception-side phase shift circuit, and a transmission-side switching notch filter are interposed between layers in the multilayer filter 702.

The antenna terminal (ANT), the transmission terminal (Tx), and the reception terminal (R
x), a ground terminal (GND), and a control terminal (CONT) for switch switching are provided. These are shown in FIG.
In order to obtain the configuration of the antenna duplexer shown in FIG.
02, the antenna duplexer 701 is configured by connecting using the upper line. The operation of the antenna duplexer 701 is the same as that described in the first embodiment.

As described above, the present invention realizes low loss at the time of non-simultaneous reception by turning ON / OFF the notch of the filter arranged on the transmission side and the switch for separating transmission / reception signals, and realizes low loss at the time of simultaneous transmission / reception. By increasing the amount of attenuation between transmission and reception and using a multilayer filter, the size of the antenna duplexer can be further reduced, and the size of the mobile communication device can be further reduced.

In this embodiment, the switch 7
03, the first switch 704, and the second switch 705 have been described as individual elements, but they may be integrated, in which case further miniaturization can be realized.

As for the switching notch filter disposed inside the multilayer filter, there are a filter formed by a lumped constant element such as an inductor and a capacitor, and a filter using a strip line resonator. These have desired characteristics. , And this combination may be used.

The positions of the antenna terminal (ANT), the transmission terminal (Tx), the reception terminal (Rx), the ground terminal (GND), the control terminal (CONT) for switch switching, and the like are arranged on the side surface of the multilayer filter 702. The number is not limited to this, but is selected depending on the system and peripheral circuit configuration. These terminals are not limited to the side surfaces, and may be arranged on the bottom surface of the multilayer filter using via holes.

The effect of the present invention is the same whether the switch or the surface acoustic wave filter is packaged or chip mounted.

Although the switches 703, 704 and 705 are separate components, they may be integrated. In that case, the circuit configuration can be further simplified.

(Embodiment 4) Next, the configuration of an antenna duplexer according to Embodiment 4 of the present invention will be described. 8, an antenna terminal (ANT) 801 is connected to an antenna switch (ANT-SW) 802, a transmission-side phase shift circuit 803, and a transmission terminal (T
x) Connected to 805. In addition, the antenna terminal (AN
T) 801 is a switch 802, a receiving-side phase shift circuit 806,
It is connected to a reception terminal (Rx) 808 via a reception filter 807.

The transmission filter 804 includes a first low-pass filter 809 and first and second switching notch filters 81
0, 811. The first low-pass filter 809 includes first and second capacitors 812 and 81
3 and a first inductor 814. The first switching notch filter 810 includes a first switch 815, a first capacitor 816, and a first switch 815.
Resonators 817 are connected in series, and the first resonator 817
Is grounded. Second switching notch filter 8
11 is a second switch 818, a second capacitor 81
9. The second resonator 820 is connected in series, and one end of the second resonator 820 is grounded. The first switching notch filter 810 is connected between the transmission-side phase shift circuit 803 and the low-pass filter 809. The second switching notch filter 811 is connected between the transmission terminal 805 and the low-pass filter 809. Further, the first and second switching notch filters 810 and 811 are adjusted so that the attenuation pole is located at a desired frequency. In this case, the configuration is such that the attenuation pole is located in the reception frequency band of the system.

The reception filter 807 includes the second low-pass filter 821 and the third and fourth switching notch filters 82
2, 823. The second low-pass filter 821 includes third and fourth capacitors 824 and 82
5 and a second inductor 826. The third switching notch filter 822 includes a third switch 827, a third capacitor 828, a third
Are connected in series, and the third resonator 829
Is grounded. Fourth switching notch filter 8
23 is a fourth switch 830, a fourth capacitor 83
The first and fourth resonators 832 are connected in series, and one end of the fourth resonator 832 is grounded. The third switching notch filter 822 is connected between the receiving-side phase shift circuit 806 and the low-pass filter 821. The fourth switching notch filter 823 is connected between the reception terminal 808 and the low-pass filter 821. Further, the second and fourth switching notch filters 822 and 823 are adjusted so that the attenuation pole is located at a desired frequency. In this case, the attenuation pole is located in the transmission frequency band of the system.

The first, second, third, and fourth switching notch filters have first, second, third, and fourth control terminals 833, 834, 835, and 83, respectively.
6 is connected, and an antenna control terminal 837 is connected to the antenna switch 802.

In FIG. 8, when the system performs non-simultaneous transmission / reception, the antenna switch 802 has a characteristic of switching transmission / reception signals in a time division manner. At this time, the transmission filter 80
The switching notch filter having the four attenuation poles is cut off to be in the OFF state, and the transmission filter 804 becomes a simple low-pass filter, and the loss in the pass band can be reduced. Further, the switching notch filter having the attenuation pole of the reception filter 807 is cut off and turned off, and the reception filter 807 becomes a simple low-pass filter, so that the loss of the pass band can be reduced.

In FIG. 8, when the system performs simultaneous transmission and reception, the antenna switch 802 has a characteristic of connecting the antenna terminal 801, the transmission-side phase shift circuit 803, and the reception-side phase shift circuit 806. At this time, the transmission filter 804 has a configuration of a low-pass filter having an attenuation pole in a reception band,
Leakage of a transmission signal to the receiving side can be reduced. At this time, the transmission-side phase shift circuit 803 is adjusted so that the impedance of the reception band when the transmission side is viewed from the reception side of the antenna switch 802 is open.

Further, the reception filter 807 is configured as a low-pass filter having an attenuation pole in the transmission band, so that the leakage of the transmission signal to the reception terminal 808 can be reduced. At this time, the transmission-side phase shift circuit 803 is adjusted so that the impedance of the reception band when the reception side is viewed from the transmission side of the antenna switch 802 is open. As described above, in the case of simultaneous transmission / reception, the transmission side and the reception side phase shift circuits 803 and 806 can operate as a duplexer by opening the mutual impedance.

As described above, according to the present embodiment, the switch for separating transmission / reception signals and the notches of the filters disposed on the transmission side and the reception side are turned ON / OFF, so that low loss can be achieved during non-simultaneous reception. It is possible to realize a small antenna duplexer having such characteristics that the amount of attenuation between transmission and reception is increased at the time of simultaneous transmission and reception, and further downsizing of the mobile communication device.

In the present embodiment, the transmission and reception switching notch filters 804 and 807 are described using a π-type low-pass filter. The same effect as that of the present invention can be obtained even with a stacked planar filter. Further, the number and configuration of the switching notch filters are not limited to this, and the ON / O
If the configuration is such that the FF is switched, the effect of the present invention can be similarly obtained. Note that the number of control terminals, the number of switching notch filters, and the configuration of the antenna switch described in the present embodiment are not limited to these, but may be adapted to the system and desired characteristics.

The switching notch filters 804 and 807
Has been described using a π-type low-pass filter, which has a configuration using a capacitor as shown in FIG.
Alternatively, the output terminal 11 can be provided without disposing a low-pass filter.
3 and the input terminal 114 may be directly connected. In this case, further reduction in loss can be realized. Also, the switching notch filters are 102 and 10
In the case of either one of the three, the input terminal 114 and the output terminal 113 may be connected without passing through a transmission circuit as shown in FIG.

Further, a configuration in which a surface acoustic wave filter, a filter using a dielectric, or the like is added to the receiving side may be used. In that case, it is possible to further secure the attenuation outside the pass band.

In this embodiment, the switch 8
02, and a first arranged inside the switching notch filter,
Second, third, and fourth switches 815, 818, 827,
830 may be a semiconductor IC or a configuration using a pin diode.

Note that the phase shift circuit shown in this embodiment may have a configuration using a strip line or a configuration using a lumped constant element such as an inductor.

Further, in the case of simultaneous transmission / reception, the loss becomes slightly larger than that in the case of non-simultaneous transmission / reception due to the addition of the switching notch filter to the low-pass filter on the transmission side. By adjusting the level, the output level transmitted to the antenna terminal can be set to a desired level. It is desirable that the output level of the transmission amplifier be adjusted by increasing the power supply voltage of the transmission amplifier in consideration of efficiency and the like.

Further, in this embodiment, an example is shown in which a composite filter having a switching notch filter is used as a transmission filter or a reception filter. However, as in the second embodiment, a normal filter is used instead of a switching notch filter. A low-pass filter or a band-pass filter may be used.

The transmission / reception phase circuit may be incorporated in a transmission / reception filter. This phase circuit adjusts the impedance, and the same effect as that of the present invention can be obtained as long as it operates as a duplexer.

(Embodiment 5) Next, the configuration of a mobile communication device using an antenna duplexer according to Embodiment 5 of the present invention will be described. FIG. 9 is a configuration diagram of a mobile communication device using an antenna duplexer. In FIG. 9, an antenna 901 is connected to an antenna duplexer 902. The antenna duplexer 902 is used in the second embodiment or the third embodiment.
Alternatively, the configuration is the same as the configuration described in the fourth embodiment. The transmission signal is transmitted to the antenna duplexer 902 via the transmission circuit 903, the transmission amplifier 904, and the isolator 905, and transmitted from the antenna 901. A reception signal from the antenna 901 is transmitted to the reception circuit 906 via the antenna duplexer 902. Further, a local signal used for mixing or modulation is input from the transmission circuit 907 to the transmission circuit 903 and the reception circuit 906. Further, the transmission amplifier 90
4 is supplied through a DC / DC converter 908. A control terminal 909 is connected to the antenna duplexer.

In FIG. 9, when the system performs non-simultaneous transmission / reception, the antenna duplexer 902 becomes a transmission / reception changeover switch having the characteristics of a filter, and can reduce the loss on the transmission side.
When the system is transmitting and receiving simultaneously, the antenna duplexer 9 is used.
02 operates with the duplexer, and separates the transmission frequency and the reception frequency by frequency division. In this case, the antenna duplexer 9
As shown in the first embodiment, a switching notch filter is provided on the transmitting side in No. 02, and the loss increases accordingly. To correct this loss, the output power transmitted from the antenna 901 as a mobile communication device is ensured by directly adjusting the power supply voltage supplied to the transmission amplifier 904 via the DC / DC converter 908. Can be.

As described above, according to the present embodiment, by applying the antenna duplexer to the mobile communication device, even in a system in which both simultaneous transmission and reception and non-simultaneous transmission and reception are mixed, low power is transmitted during non-simultaneous reception. It is possible to realize a small mobile communication device having lossy characteristics and increasing the amount of attenuation between transmission and reception during simultaneous transmission and reception.

In this embodiment, one control terminal of the antenna duplexer is used. However, the number of control terminals of the switching notch filter, the configuration of the antenna switch, the system, and desired characteristics can be appropriately adjusted.

In this embodiment, transmission amplifier 904 and antenna duplexer 902 are connected to isolator 80
5, but may be connected directly without the isolator 805.

Further, in the present embodiment, one transmitting circuit 907 has been described, but the effect of the present invention is the same even if a plurality of transmitting circuits 907 exist depending on the system.

Also, the switching notch filter, which is a component of the antenna duplexer 902, has been described using a π-type low-pass filter, but it has a configuration using a capacitor as shown in FIG. Alternatively, a configuration in which the output terminal 113 and the input terminal 114 are directly connected without disposing a low-pass filter may be employed. When the switching notch filter is one of 102 and 103, FIG.
As shown in (b), the input terminal 114 does not pass through the transmission circuit.
And the output terminal 113 may be connected. In this case, further reduction in loss can be realized. Also,
In this case, if the isolator 805 and the like have a low-pass filter function, a mobile communication device with higher performance can be obtained.

[0119]

As is apparent from the above description, the present invention relates to an antenna duplexer which can cope with a case where a system using a frequency division system which is a simultaneous transmission and reception and a system which is not a simultaneous transmission and reception coexist. Mobile communication equipment can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a composite filter according to Embodiment 1 of the present invention.

FIG. 2 is another configuration diagram of the composite filter according to the first embodiment of the present invention.

3A is a configuration diagram of a switch using an FET. FIG. 3B is a configuration diagram of a switch using a pin diode. FIG. 3C is a configuration diagram of a switch using a pin diode and a λ / 4 line.

FIG. 4 is a configuration diagram of an antenna duplexer according to Embodiment 2 of the present invention.

5A is a configuration diagram of an antenna duplexer for non-simultaneous transmission and reception; FIG. 5B is a configuration diagram of an antenna duplexer for simultaneous transmission and reception;

FIG. 6A is a schematic configuration diagram of an antenna switch. FIG. 6B is a configuration diagram of a control terminal of an antenna switch and a switching notch filter.

FIG. 7 is a configuration diagram of an antenna duplexer according to a third embodiment of the present invention.

FIG. 8 is a configuration diagram of an antenna duplexer according to a fourth embodiment of the present invention.

FIG. 9 is a configuration diagram of a mobile communication device according to a fifth embodiment of the present invention.

FIG. 10 is a configuration diagram of a conventional duplexer.

11A is a diagram illustrating another configuration of the switching notch filter forming the composite filter according to the first embodiment of the present invention. FIG. 11B is a diagram illustrating the switching notch filter forming the composite filter according to the first embodiment of the present invention. Diagram showing another configuration (c) Diagram showing another configuration of the switching notch filter constituting the composite filter according to Embodiment 1 of the present invention

FIG. 12 is a diagram showing another configuration of the composite filter according to the first embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Low-pass filter 102 1st switching notch filter 103 2nd switching notch filter 104, 105 Capacitor 106 Inductor 107 1st switch 108 1st capacitor 109 1st resonator 110 2nd switch 111 2nd Capacitor 112 Second resonator 113 Output terminal 114 Input terminal 115 First control terminal 116 Second control terminal

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H03K 17/693 H03K 17/693 A 17/76 17/76 A H04B 1/40 H04B 1/40 (72) Inventor Toshifumi Adachi 1006 Kadoma, Kazuma, Kazuma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Makoto Sakakura 1006 Kadoma, Kazuma, Kadoma, Osaka Pref. 1006 Oaza Kadoma Matsushita Electric Industrial Co., Ltd. Hama 55-12 Matsushita Nitto Electric Co., Ltd. F term (reference) 5J006 HB03 JA02 JA12 KA02 KA12 KA24 LA03 LA21 NA08 NB09 5J012 BA02 5J050 AA06 BB02 CC12 DD0 1 DD06 EE05 5J055 AX05 BX01 CX24 DX10 DX12 EX07 EY05 EY12 EY21 EZ12 FX13 FX33 GX01 GX02 5K011 BA02 BA04 DA00 DA21 DA27 JA01

Claims (30)

[Claims] An antenna terminal, a transmission phase shift circuit having one connected to the antenna terminal side, a reception phase shift circuit having one connected to the antenna terminal side, and the other of the transmission phase shift circuit And a transmission filter connected to a transmission terminal; and a reception filter connected to the other of the reception phase shift circuit and a reception terminal, wherein the transmission filter and / or the reception filter are:
A composite filter, wherein the composite filter has a characteristic having an attenuation pole during simultaneous transmission and reception in which transmission and reception are performed at the same time, and controls the respective impedances by the transmission phase shift circuit and the reception phase shift circuit, thereby making a duplexer. An antenna duplexer that operates as a non-simultaneous transmission and reception in which transmission and reception are not performed at the same time, and has characteristics in which the attenuation pole is removed. 2. An antenna terminal, an antenna switch connected to the antenna terminal, a transmission phase shift circuit connected to one terminal of the antenna switch, and a reception phase shifter connected to the other terminal of the antenna switch. A phase filter, a transmission filter connected to the other of the transmission phase shift circuit and the transmission terminal, and a reception filter connected to the other and the reception terminal of the reception phase shift circuit, and do not simultaneously perform transmission and reception. At the time of non-simultaneous transmission / reception, the antenna switch switches the operation of electrically connecting the antenna terminal to the one terminal and the operation of electrically connecting the antenna terminal to the other terminal in a time-division manner. Performing an operation, at the time of simultaneous transmission and reception to simultaneously perform transmission and reception, the antenna switch connects the antenna terminal to the one terminal and the other Antenna duplexer simultaneously operating to electrically connect to the child. 3. The transmission filter is a composite filter, and the composite filter has a characteristic having an attenuation pole at the time of the simultaneous transmission and reception, and causes the transmission phase shift circuit and the reception phase shift circuit to change respective impedances. The antenna duplexer according to claim 2, wherein the antenna duplexer is controlled to operate as a duplexer, and has a characteristic in which the attenuation pole is removed during the non-simultaneous transmission and reception. 4. An antenna duplexer having a structure using a multilayer filter using a dielectric green sheet, wherein at least one of the transmission filter and the reception filter is built in the multilayer filter. 4. The antenna duplexer according to claim 1, wherein said switch is mounted on an upper surface of said multilayer filter. 5. The antenna duplexer according to claim 1, wherein said reception filter is a surface acoustic wave filter. 6. The antenna duplexer according to claim 2, wherein the reception filter is the composite filter according to claim 3. 7. The output level of a transmission amplifier connected directly or indirectly to the transmission terminal at the time of the simultaneous transmission / reception is increased as compared with the case of the non-simultaneous transmission / reception.
Or the antenna duplexer according to 3. 8. The antenna duplexer according to claim 7, wherein the adjustment for increasing the output level of the transmission amplifier is performed by increasing a power supply voltage of the transmission amplifier. 9. The composite filter has an input terminal, an output terminal, at least one transmission circuit, and at least one or more switching notch filters, and a signal between the input terminal and the output terminal. The transmission circuit is electrically connected, the switching notch filter is connected to at least one of an input side and an output side of the transmission circuit, and the switching notch filter has at least one switch and at least one series resonance. One end of the switch is connected between the input terminal and the output terminal, the other end of the switch is connected to one end of the series resonance circuit, and the switch switches ON / OFF. The antenna duplexer according to any one of claims 1, 3, 5, and 6, further comprising a control terminal. 10. When the switch is in an ON state, a pass characteristic from the input terminal to the output terminal is a characteristic having an attenuation pole formed by the characteristic of the transmission circuit and the series resonance circuit of the switching notch filter. The antenna duplexer according to claim 9, wherein the transmission characteristics from the input terminal to the output terminal are substantially the characteristics of a transmission circuit when the switch is in an OFF state. 11. The antenna duplexer according to claim 10, wherein said transmission circuit has a circuit configuration having a filter function. 12. The antenna duplexer according to claim 9, wherein the transmission circuit is configured by connecting capacitors in series. 13. The antenna duplexer according to claim 9, wherein said transmission circuit is constituted by a strip line. 14. The antenna duplexer has a structure using a laminated filter using a dielectric green sheet, the switching notch filter is built in the laminated filter, and the switching notch filter is provided on an upper surface of the laminated filter. The antenna duplexer according to claim 9, wherein a switch is mounted. 15. The duplexer according to claim 2, wherein the antenna switch is integrated with another switch connected to the antenna terminal. 16. An operation in which said antenna switch electrically connects said antenna terminal, said one terminal and said other terminal by the same control signal during said simultaneous transmission and reception, and a switching notch filter of said composite filter. 10. The antenna duplexer according to claim 9, which performs an operation of turning on said switch. 17. An operation in which the antenna switch disconnects an electrical connection from the antenna terminal to one of the terminals or the other terminal in a time-sharing manner by the same control signal during the non-simultaneous transmission / reception. 10. An antenna duplexer according to claim 9, wherein the operation of turning off a switch of a filter switching notch filter is performed. 18. When the switch is turned on, the series resonance circuit has a characteristic having an attenuation pole. When the switch is turned off, the series resonance circuit operates from the input terminal to the output terminal. The antenna duplexer according to claim 9, wherein the antenna is electrically disconnected, and a transmission characteristic from the input terminal to the output terminal is substantially a characteristic of a transmission circuit. 19. The antenna duplexer according to claim 9, wherein an FET is used for said switch. 20. The antenna duplexer according to claim 9, wherein a pin diode is used for the switch. 21. The antenna duplexer according to claim 9, wherein a pin diode and a 波長 wavelength line are used for said switch. 22. The antenna duplexer according to claim 9, wherein the series resonance circuit has a configuration in which a capacitor and a resonator are connected in series. 23. The antenna duplexer according to claim 9, wherein the series resonance circuit has a configuration in which an inductor and a resonator are connected in series. 24. The duplexer according to claim 9, wherein the series resonance circuit has a configuration in which a circuit in which a capacitor and an inductor are connected in parallel and a resonator are connected in series. 25. The composite filter, comprising: an input terminal; an output terminal; at least one transmission circuit;
At least one switching notch filter, wherein the transmission circuit is electrically connected between the input terminal and the output terminal, and the switching notch filter is connected to at least one of an input side and an output side of the transmission circuit. The switching notch filter has at least one switch and at least one surface acoustic wave filter, and one end of the switch is connected between the input terminal and the output terminal, The antenna duplexer according to any one of claims 1, 3, 5, and 6, wherein the other end of the switch is connected to one end of the surface acoustic wave filter, and the switch has a control terminal for switching ON / OFF. . 26. The composite filter includes an input terminal, an output terminal, and at least one switching notch filter connected to the input terminal and the output terminal, wherein the switching notch filter includes the input terminal and the switching notch filter. A second switch connected to the output terminal, a notch filter and a transmission circuit having predetermined characteristics are connected in parallel between the two switches, and the notch filter and the predetermined The antenna duplexer according to claim 9, wherein the transmission circuit having characteristics is switchable by the switch. 27. The antenna duplexer according to claim 26, wherein the notch filter includes a parallel resonance circuit. 28. The antenna duplexer according to claim 26, wherein the notch filter is a surface acoustic wave filter. 29. A mobile communication device corresponding to simultaneous transmission / reception simultaneously performing transmission and reception and non-simultaneous transmission / reception not simultaneously performing transmission and reception, comprising: an antenna connection circuit; A mobile communication device using the duplexer according to claim 1. 30. A mobile communication device corresponding to simultaneous transmission / reception simultaneously performing transmission and reception and non-simultaneous transmission / reception not simultaneously performing transmission and reception, wherein the non-simultaneous transmission / reception includes a transmitting side and a receiving side. An antenna connection circuit that operates as a transmission / reception changeover switch having a filter and operates as a duplexer in the case of simultaneous transmission / reception, wherein the antenna connection circuit uses the antenna duplexer according to claim 2. Body communication equipment.