JP2002141764A - Frequency divider circuit, and antenna switch laminated module composite component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optimally downsized antenna switch laminated module composite component. SOLUTION: The frequency divider circuit divides a signal into 3 different frequencies f1, f2, f3 having relations of f1<f2<f3 and (f2-f1)<(f3-f2) and is characterized in that a 1st divider filter that divider the signal into a signal with the frequencies f1 and f2 and a signal with the frequency f3 is connected to an antenna and a 2nd divider filter that divides the signal into the frequencies f1 and f2 is connected to the 1st branching filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a frequency demultiplexing circuit,
More particularly, the present invention relates to an antenna switch laminated module composite component suitable for them, and more particularly to a component for transmitting and receiving signals of three different frequencies by using a single antenna.

[0002]

2. Description of the Related Art A so-called triple-band antenna switch laminated module composite component has been conventionally known. Even if we say triple band, D using 1800MHz band
CS (Digital Cellular System)
m) and PCS (Personal Communication)
GSM (Global System for M) that uses 900 MHz service
obile Communication). The frequencies are 1800 MHz and 90
It is two frequency bands of 0 MHz. For example, JP-A-2000-
Japanese Patent No. 165274 discloses a first device having a close frequency.
And a second communication system, and a front end unit corresponding to a third communication system having a different frequency from the first and second communication systems, and the first to third communication systems are used for transmission. A diplexer that combines transmission signals from the communication systems and distributes reception signals to the first to third communication systems during reception; a common transmission unit of the first and second communication systems; A first high-frequency switch having four ports separated into a receiver of the first communication system and a receiver of the second communication system, and a three-port separated into a transmitter and a receiver of the third communication system; A second high-frequency switch, a first filter that allows transmission and reception signals of the first and second communication systems to pass therethrough,
A second transmitting and receiving signal of the third communication system;
And a composite high-frequency component comprising the above filter. Also, Japanese Patent Application Laid-Open No. 2000-165288 discloses a front system corresponding to a first and a second communication system having frequencies close to each other, and a third communication system having a frequency different from the first and second communication systems. A composite high-frequency component that constitutes an end unit, and combines transmission signals from the first to third communication systems during transmission,
Upon reception, a diplexer that distributes a received signal to the first to third communication systems, a transmission unit of the first and second communication systems, and a reception unit of the first and second communication systems. A first high-frequency switch to be separated;
A second high-frequency switch that separates into a receiving unit of the communication system and a receiving unit of the second communication system, a third high-frequency switch that separates into a transmitting unit and a receiving unit of the third communication system, A plurality of sheet layers made of ceramics, comprising a first filter for transmitting and receiving signals of the first and second communication systems and a second filter for transmitting and receiving signals of the third communication system, are laminated. A composite high-frequency component characterized by being integrated with a ceramic multilayer substrate is disclosed.

[0003]

Many of the conventional triple band composite high frequency components operate at two frequencies of 900 MHz band and 1800 MHz band, and as a frequency demultiplexing circuit, those which divide the frequency into 900 MHz and 1800 MHz are used. In most cases, there was no need for a frequency demultiplexing circuit for demultiplexing signals of three different frequencies. The frequency demultiplexing circuit according to the present invention includes a GSM400 system 400 MHz band, a WCDM band, in addition to the 900 MHz band and the 1800 MHz band.
A (Wideband Code Division)
2400MH of Multiple Access method
It is intended to split signals of three different frequencies, which are relatively separated from each other, in the z band and the like. The frequency wave demultiplexing circuit for demultiplexing a signal having a relationship of f1 <f2 <f3 between three different frequencies f1, f2, and f3 is a circuit easily surrounded by a dashed line in FIG. Devised. In other words, the low-pass filter LPF separates the low-frequency signal f1, the high-pass filter HPF separates the high-frequency signal f3, and the band-pass filter BPF uses the middle frequency f2 of f1 and f3. This is to split the signal. However, in this circuit, it is necessary to use a lot of notch filters in order to obtain isolation between frequencies, so that the configuration of the circuit is inevitably large and it is difficult to reduce the size of the module. In addition, as compared with the conventional frequency division circuit for two-wavelength division, the number of terminals is increased, so that matching adjustment is complicated, and much time and man-hours are required for circuit optimization. An object of the present invention is to solve the above problems and to provide an optimally compact antenna switch laminated module composite component.

[0004]

SUMMARY OF THE INVENTION The present invention has the following constitution. (1) f between three different frequencies f1, f2, f3
1 <f2 <f3, and (f2-f1) <(f3-f2)
A frequency demultiplexing circuit for demultiplexing a signal having the following relationship, wherein a first demultiplexer for demultiplexing the signals of f1, f2 and f3 is connected to the antenna, and the first demultiplexer is connected to the first demultiplexer. Signal and f
2 is a frequency demultiplexing circuit to which a second demultiplexer for demultiplexing two signals is connected. (2) f between three different frequencies f1, f2, f3
1 <f2 <f3 and (f2-f1)> (f3-f2)
A frequency demultiplexing circuit for demultiplexing a signal having the following relationship, wherein a first demultiplexer for demultiplexing the signals of f2 and f3 and the signal of f1 is connected to an antenna, and the first demultiplexer is connected to the first demultiplexer. Signal and f
3 is a frequency demultiplexing circuit to which a second demultiplexer for demultiplexing the signal of No. 3 is connected. (3) f between three different frequencies f1, f2, f3
1 <f2 <f3, and (f2-f1) <(f3-f2)
A frequency demultiplexing circuit for demultiplexing a signal having the following relationship, wherein a first demultiplexer for demultiplexing the signals of f1, f2 and f3 is connected to the antenna, and the first demultiplexer is connected to the first demultiplexer. Signal and f
A second splitter for splitting the second signal is connected, and a filter on the low frequency side of the first splitter is connected to the first transmission line and the transmission line in series with the first transmission line. And a first capacitor connected to the ground between the first transmission line and the first parallel resonance circuit, and a first capacitor connected to ground between the first transmission line and the first parallel resonance circuit. A second parallel resonance circuit including a transmission line and a capacitor; a second capacitor connected in series with the second parallel resonance circuit; a second parallel resonance circuit including the second parallel resonance circuit; And a second transmission line connected to ground between the second parallel branch circuit and the third parallel resonance circuit including the transmission line and the capacitor. Having a third capacity,
A filter on the high frequency side of the second duplexer, a fourth parallel resonance circuit including a transmission line and a capacitor; a fourth capacitor connected in series to the fourth parallel resonance circuit; A frequency demultiplexing circuit having a third transmission line connected to the ground between the parallel resonance circuit and the fourth capacitor. (4) The frequency demultiplexing circuit according to (1), (2) or (3), wherein the transmission line and the capacitance constituting the frequency demultiplexer are incorporated in the laminated substrate. (5) Three different frequencies f transmitted and received by the antenna
1, f2, f3, f1 <f2 <f3, and (f2-
An antenna switch laminated module composite component for demultiplexing and switching a signal having a relationship of f1) <(f3-f2), wherein a first duplexer for demultiplexing the signals of f1 and f2 and the signal of f3 is provided in the antenna. And the signal of f1 and f
A second demultiplexer for demultiplexing the signal of No. 2 is connected, the first demultiplexer and the second demultiplexer are built in a laminated substrate, and a switch element for switching transmission / reception signals is mounted on the laminated substrate. This is an antenna switch laminated module composite component characterized in that: (6) Three different frequencies f transmitted and received by the antenna
1, f2, f3, f1 <f2 <f3, and (f2-
An antenna switch laminated module composite component for demultiplexing and switching a signal having a relationship of f1)> (f3-f2), wherein the antenna has a first duplexer for demultiplexing the signals of f2 and f3 and the signal of f1. And the signal of f2 and f
A second demultiplexer for demultiplexing the signal of No. 3 is connected, the first demultiplexer and the second demultiplexer are built in a laminated substrate, and a switch element for switching transmission / reception signals is mounted on the laminated substrate. This is an antenna switch laminated module composite component characterized in that: (7) Three different frequencies f transmitted and received by the antenna
1, f2, f3, f1 <f2 <f3, and (f2-
An antenna switch laminated module composite component for demultiplexing and switching a signal having a relationship of f1) <(f3-f2), wherein a first duplexer for demultiplexing the signals of f1 and f2 and the signal of f3 is provided in the antenna. And the signal of f1 and f
A second demultiplexer for demultiplexing the second signal is connected, and a low-frequency filter of the first demultiplexer is connected in series with the first transmission line and the first transmission line. A first parallel resonance circuit including a line and a capacitor, the first transmission line and the first
A first capacitor connected to the ground between the first splitter and the parallel resonance circuit, wherein a filter on a high frequency side of the first duplexer has
A second parallel resonance circuit including a transmission line and a capacitor, a second capacitor connected in series with the second parallel resonance circuit, and a second capacitor connected between the second parallel resonance circuit and the second capacitor. A second transmission line connected to the ground, wherein the filter on the low frequency side of the second duplexer has a third transmission line and a capacitor.
A third capacitor connected to ground and a third capacitor connected to the ground, wherein a filter on the high frequency side of the second duplexer includes a fourth parallel resonance circuit including a transmission line and a capacitor; A fourth capacitor connected in series to a circuit, and a third transmission line connected to ground between the fourth parallel resonance circuit and the fourth capacitor; And the second duplexer is built in a laminated substrate, and a switch element for switching transmission / reception signals is mounted on the laminated substrate.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Action) Three different frequencies f
In a frequency demultiplexing circuit that demultiplexes a signal having a relationship of f1 <f2 <f3 between 1, f2, and f3, (f2-f1)
In the case of <(f3-f2), a first demultiplexer for demultiplexing the signals of f1 and f2 and the signal of f3 is connected to the antenna, and the signals of f1 and f2 are demultiplexed to the first demultiplexer. (F2−f1)>
In the case of (f3-f2), a first duplexer that splits the signals of f2 and f3 and the signal of f1 is connected to the antenna, and the first splitter is connected.
An important concept in designing a triple-band antenna switch laminated module composite component is to connect a second duplexer for splitting each of the signals f2 and f3 to the duplexer to form a frequency splitter circuit. The present inventors have found that Hereinafter, the present invention will be specifically described with reference to the drawings.

Generally, as a characteristic of a low-pass filter LPF or a high-pass filter HPF, an insertion loss tends to increase at a frequency outside the center frequency of a pass band.
Therefore, between three different frequencies f1, f2, f3, f
When demultiplexing a signal having a relationship of 1 <f2 <f3, the first
The two signals having a small difference in frequency are separated first from the remaining signals by a branching circuit, and the two signals having a small difference in frequency are separated by a second branching circuit connected to the first branching filter. The present inventor has devised that a wideband and low-loss frequency demultiplexing circuit can be realized. 1 and 2 are block diagrams of a frequency demultiplexing circuit according to the present invention, which demultiplexes signals of three different frequencies f1, f2, and f3. Where ANT
Indicates a terminal connected to the antenna. According to the present invention,
F1 <f between three different frequencies f1, f2, f3
In a frequency demultiplexing circuit that demultiplexes a signal having a relation of 2 <f3, if (f2−f1) <(f3−f2), a first antenna that demultiplexes the signal of f1 and f2 and the signal of f3 into the antenna.
A frequency demultiplexing circuit (FIG. 1) in which a demultiplexer is connected, and a second demultiplexer for demultiplexing each of the signals f1 and f2 is connected to the first demultiplexer; (f2-f1)> (f3 In the case of −f2), the first antenna for separating the signals of f2 and f3 and the signal of f1 into the antenna is used.
A frequency demultiplexer circuit (FIG. 2) in which a demultiplexer is connected and a second demultiplexer for demultiplexing the signals of f2 and f3 is connected to the first demultiplexer.

As an example, f1 = 400 MHz, f2
= 900 MHz, f3 = 1800 MHz. In this case, (f2-f1)
= 500 MHz, (f3-f2) = 900 MHz,
There is a relationship (f2-f1) <(f3-f2). Therefore, the frequency demultiplexing circuit has the configuration shown in FIG. FIG. 3 is a circuit block diagram of the antenna switch laminated module composite component in this embodiment. First, a low-pass filter LPF1 and a high-pass filter H connected to the antenna ANT.
A first splitter made of PF1 is connected, and f1 and f2 having a small frequency difference are split from f3. 6 to 8 can be used as another configuration example of the first duplexer. next,
The signals of f1 and f2 are split into f1 and f2 by a second splitter composed of a low-pass filter LPF2 and a high-pass filter HPF2 connected to the first splitter. As another configuration example of the second duplexer, those shown in FIGS. 6 to 8 can be used. The demultiplexed signals of f1, f2 and f3 are respectively switched to a reception system and a transmission system by switch circuits SW1 to SW3. Low-pass filters LPF3 to LPF for the transmission system
5 are interposed to remove noise. The signals of the frequencies f1, f2, and f3 are respectively transmitted from the transmission terminals Tx1 and Tx1.
Connected to Tx2 and Tx3. Receiving terminals Rx1, Rx
2, Rx3 is directly connected to each switch circuit. As the switch circuit, an electronic switch using a known PIN diode or GaAs can be used.

Next, the features of the frequency demultiplexing circuit shown in FIG. 3 according to the present invention will be described. Frequency f1 = 400M
Considering a frequency demultiplexing circuit for demultiplexing each of Hz, f2 = 900 MHz, and f3 = 1800 MHz, LPF and BPF surrounded by a dashed line in FIG. , HPF, a frequency demultiplexing circuit composed of three filters. Table 1 shows a comparison of characteristics between the frequency demultiplexer composed of three filters as shown in FIG. 9 and the frequency demultiplexer of FIG. 3 according to the present invention.

[0009]

[Table 1] As is clear from Table 1, it can be seen that the circuit configuration according to the present invention can improve the passing insertion loss in each frequency band by 0.1 to 0.3 dB.

Another feature of the circuit of the present invention as shown in FIG. 3 is that matching between terminals can be easily adjusted. That is, in the case of the conventional circuit configuration shown in FIG.
While the four terminals T, f1, f2, and f3 had to be matched at the same time, in the case of the circuit of FIG. 3 according to the present invention, the three terminals ANT, node N, and f3 were first used. By adjusting the distance between the terminals and then matching between the three terminals of the nodes N, f2, and f3, the entire matching can be adjusted. Therefore, since the matching adjustment is performed twice, the matching adjustment of the entire circuit is facilitated and the accuracy is improved.

FIG. 4 shows an example of a specific circuit configuration of the frequency demultiplexing circuit shown by a chain line in FIG. In FIG. 4, L1
L7 is a transmission line, and C1 to C8 are capacitors. Further, in the filter on the low frequency side of the first splitter, a circuit configuration in which the order viewed from the antenna side is inverted as shown in FIG. 5 can be used. Demultiplexed frequency bands f1, f
Since the matching of the whole circuit is different depending on the combination of 2, f3, by adopting the circuit configuration of FIGS. 4 and 5 which can easily achieve the matching of the whole circuit, a frequency demultiplexing circuit having a wide band and low loss can be obtained. realizable.

[0012]

According to the present invention, there is provided a compact, wideband, low-loss frequency demultiplexing circuit for demultiplexing three different frequencies, and a small, wideband, low-loss triple using this frequency demultiplexing circuit. An antenna switch laminated module composite component for a band is provided.

[Brief description of the drawings]

FIG. 1 is a block diagram of a frequency demultiplexing circuit according to the present invention.

FIG. 2 is a block diagram of a frequency demultiplexing circuit according to the present invention.

FIG. 3 is a block diagram showing an antenna switch module according to the present invention.

FIG. 4 is a diagram illustrating an example of a specific circuit of the frequency demultiplexing circuit illustrated in FIG. 3;

FIG. 5 is a diagram illustrating an example of a specific circuit of the frequency demultiplexing circuit illustrated in FIG. 3;

FIG. 6 is a diagram showing another example of the first and second duplexers.

FIG. 7 is a diagram showing another example of the first and second duplexers.

FIG. 8 is a diagram showing another example of the first and second duplexers.

FIG. 9 is a block diagram illustrating an antenna switch module according to the related art.

[Explanation of symbols]

 ANT: Antenna N: Node LPF, LPF1 to LPF5: Low pass filter HPF, HPF1 to HPF2: High pass filter BPF: Band pass filter NF: Notch filter SW1 to SW3: Switch circuit Tx1, Tx2, Tx3: Transmission terminal Rx1, Rx2, Rx3 : Receiving terminal f1, f2, f3: Frequency L1 to L7: Transmission line C1 to C8: Capacitor

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroyuki Takai 70-2, Minamisakaemachi, Tottori City, Tottori Prefecture F-term in the Tottori Plant of Hitachi Metals Co., Ltd. 5J024 AA01 BA11 BA18 BA19 CA03 CA09 CA10 DA01 DA25 EA01 EA02 5K011 BA03 DA02 DA22 JA01 KA01

Claims (7)

[Claims] 1. Three different frequencies f1, f2, f3
F1 <f2 <f3 and (f2−f1) <(f3
-F2) a frequency demultiplexing circuit for demultiplexing a signal having a relationship of: f1), wherein a first demultiplexer for demultiplexing the signals of f1 and f2 and the signal of f3 is connected to an antenna; And a second demultiplexer for demultiplexing the signal of f1 and the signal of f2. 2. Three different frequencies f1, f2, f3.
F1 <f2 <f3 and (f2−f1)> (f3
A frequency demultiplexing circuit for demultiplexing a signal having a relationship of -f2), wherein a first demultiplexer for demultiplexing the signals of f2, f3 and f1 is connected to an antenna; And a second demultiplexer for demultiplexing the signal of f2 and the signal of f3. 3. A first parallel resonance circuit comprising: a first transmission line, a transmission line connected in series with the first transmission line, and a capacitor, wherein a filter on a low frequency side of the first branching filter is provided. And a first capacitor connected to ground between the first transmission line and the first parallel resonance circuit.
A filter on the high frequency side of the duplexer, a second parallel resonance circuit including a transmission line and a capacitor, a second capacitor connected in series with the second parallel resonance circuit, and a second parallel resonance circuit A second transmission line connected to the ground between the first and second capacitors, wherein a low-frequency filter of the second duplexer has a third parallel resonance circuit including the transmission line and the capacitor. And a third capacitor connected to the ground, wherein a filter on the high frequency side of the second duplexer is connected in series with a fourth parallel resonance circuit including a transmission line and a capacitor, and a fourth parallel resonance circuit. And a fourth transmission line connected to ground between the fourth parallel resonance circuit and the fourth capacitance. Item 2. The frequency demultiplexing circuit according to item 2. 4. The frequency demultiplexer according to claim 1, wherein a transmission line and a capacitor constituting the first demultiplexer and the second demultiplexer are built in a laminated substrate. circuit. 5. A signal which has a relationship of f1 <f2 <f3 and (f2-f1) <(f3-f2) between three different frequencies f1, f2, and f3 transmitted and received by an antenna, is demultiplexed and switched. An antenna switch laminated module composite component, comprising: an antenna switch that separates signals of f1 and f2 and a signal of f3 into an antenna;
A first duplexer is connected, a second duplexer that splits the signal of f1 and the signal of f2 is connected to the first duplexer, and the first duplexer and the second duplexer are stacked. An antenna switch laminated module composite component, wherein a switch element for switching transmission / reception signals is mounted on a laminated substrate. 6. A signal which has a relationship of f1 <f2 <f3 and (f2-f1)> (f3-f2) between three different frequencies f1, f2, and f3 transmitted and received by an antenna, is demultiplexed and switched. An antenna switch laminated module composite component, comprising: an antenna for separating a signal of f2 and f3 and a signal of f1 into an antenna;
A first duplexer is connected, a second duplexer that splits the signal of f2 and the signal of f3 is connected to the first duplexer, and the first duplexer and the second duplexer are stacked. An antenna switch laminated module composite component, wherein a switch element for switching transmission / reception signals is mounted on a laminated substrate. 7. Demultiplexing and switching a signal having a relationship of f1 <f2 <f3 and (f2-f1) <(f3-f2) between three different frequencies f1, f2, and f3 transmitted and received by an antenna. An antenna switch laminated module composite component, wherein a first demultiplexer for demultiplexing the signals of f1 and f2 and the signal of f3 is connected to the antenna, and the signal of f1 and the signal of f2 are connected to the first demultiplexer. A second demultiplexer for demultiplexing is connected, and the filter on the low frequency side of the first demultiplexer is connected to a first transmission line, a transmission line connected in series with the first transmission line, and a capacitance. A first capacitor connected to the ground between the first transmission line and the first parallel resonance circuit, and a first capacitor connected to the high frequency side of the first duplexer. The filter includes a second parallel resonance circuit including a transmission line and a capacitor, and the second parallel resonance circuit. A second capacitor connected in series with a path, and a second transmission line connected to ground between the second parallel resonance circuit and the second capacitor; Is connected to a third parallel resonant circuit comprising a transmission line and a capacitor and a ground.
And the filter on the high frequency side of the second duplexer is
A fourth parallel resonance circuit including a transmission line and a capacitance, a fourth capacitance connected in series to the fourth parallel resonance circuit, and a fourth capacitance between the fourth parallel resonance circuit and the fourth capacitance. A third transmission line connected to a ground, the first duplexer and the second duplexer being built in a multilayer substrate, and a switch element for switching transmission / reception signals mounted on the multilayer substrate; An antenna switch laminated module composite part characterized by the above-mentioned.