JPH098685A - Multiband antenna multicoupler - Google Patents

Abstract

PURPOSE: To provide the antenna multicoupler having an integrated constitution which has a small number of components and requires a short assembling time by connecting down terminals of antenna multicouplers to a down common terminal through capacitors. CONSTITUTION: This antenna multicoupler is constituted so as to have a common down terminal TDC and individual up terminals TU1 and TU2 . Capacitors 13 and 14 are provided instead of a conventional λ/4 transmission line, and values of resonators 15 and 16 are changed in comparison with that of a single multicoupler, and antenna multicouplers 11 and 12 are coupled. Consequently, the constitution of each of antenna multicoupelrs themselves is not different from conventional. In this case, capacitors are small-sized and are very easily attached by soldering, and the change of original set values is enough in each antenna multicoupler. Thus, an integrated structure is easily given to the whole of multicouplers, and the number or components is not increased at all, and the assembling work time is considerably shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-band antenna duplexer, and more particularly to a multi-band antenna duplexer suitable for use as a repeater in a mobile phone system.

[0002]

2. Description of the Related Art In analog type mobile phone systems,
The 870-885 MHz band is used for the downlink from the base station to the slave station, and the 925-940 MHz band is used for the uplink from the slave station to the base station. In a relay amplifier or the like for improving communication in a dead area where there are many obstacles to radio wave propagation between a base station, a slave station, or a base station, one antenna is used for both the downlink and uplink antennas. However, an antenna duplexer is used for this purpose.

FIG. 3 is an equivalent circuit diagram showing an example of the structure of an antenna duplexer. In this example, the resonators 310-310
A five-stage bandpass filter composed of 314, coupling capacitors 321 to 324, and matching capacitors 331 and 332, a resonator 315 to 319, coupling capacitors 325 to 328, and matching capacitors 333, 3
Each of these bandpass filters is composed of a five-stage bandpass filter composed of 34, and each of these bandpass filters passes an upstream signal passing through the upstream terminal T _U and the antenna terminal T _A and a downstream terminal T _D and the antenna terminal T _A. It separates the downlink signal from the

On the other hand, in the digital mobile phone system, the 810 to 818 MHz band is used for the downlink and the 940 to 948 MHz band is used for the uplink. Even in the case of this digital system, at the base station etc., the same antenna duplexer as shown in FIG. 3 is used,
The antenna is shared.

By the way, there are many areas where the analog system and the digital system coexist, and when the relay amplifier for the dead zone countermeasure is installed in such an area, if the relay amplifier body is shared, the size and economy are reduced. Can be realized. To this end, a multi-band antenna duplexer having a function of combining one or both of the two types of downlinks and uplinks into one terminal and having the capability of separating the downlinks and uplinks of each scheme is required.

FIG. 4 shows a conventional configuration example of the above-mentioned multi-band antenna duplexer.
And 42 are the common antenna duplexers shown in FIG. Analog antennas and digital antennas are connected to the antenna terminals T _A1 and T _A2 of each antenna duplexer, and uplink repeaters of each method are connected to the uplink terminals T _U1 and T _U2. . On the other hand, the downlink terminals T _D1 and T _D2 of the two antenna duplexers are one downlink common terminal via the λ / 4 transmission lines 43 and 44 having a length determined according to each frequency band used in the two systems. Connected to T _DC .
The insertion of the λ / 4 transmission line is for compensating for the change in the matching condition that occurs when the two antenna duplexers are connected and for separating the two antenna duplexers. In this way, it is possible to connect the relay amplifier for both the two systems to the downlink common terminal T _DC .

In the above-mentioned multi-band antenna duplexer, the downlink terminals are common, but it is also the case that the uplink terminals are common or both downlink and uplink are common.

[0008]

In the above-mentioned prior art, the λ / 4 transmission line is used in the connection portion between the antenna duplexers. As this transmission line, a semi-rigid cable with a length of several cm is used to reduce loss as much as possible, but this is difficult to bend and requires a space for routing. In addition, such a cable connection requires a connector on the cable terminal and a junction box to receive the connector, which causes an increase in the number of parts and assembly time and cost. However, it was difficult to make a compact structure.

An object of the present invention is to provide a multi-band antenna duplexer which requires only a small number of parts and a small assembly time, and which is compact and can be constructed at low cost.

[0010]

According to the present invention, a first downlink signal of a first frequency band transmitted / received via a first antenna is connected to its downlink terminal and transmitted / received via the first antenna. A first antenna duplexer for connecting the first uplink signal of the second frequency band to the uplink terminal,
The second downlink signal of the third frequency band, which is transmitted and received via the second antenna, is connected to its downlink terminal, and the second uplink signal of the fourth frequency band, which is transmitted and received via the second antenna, is transmitted. In a multi-band antenna duplexer configured by using a second antenna duplexer for connecting to the upstream terminal, one common terminal is provided and the downlink terminal of the first antenna duplexer is shared by the common antenna. A multi-band antenna duplexer, characterized in that it is connected to a terminal via a first capacitor, and the down terminal of the second antenna duplexer is connected to the common terminal via a second capacitor. Disclose.

[0011]

The value of the matching capacitor of the duplexer originally used in place of the conventional λ / 4 transmission path, and
The matching frequency is changed so that the resonance frequency of the resonator attached to the matching capacitor side is seen from the common terminal connected to it, and the impedance of the other band is ∞. is there. This eliminates the need for the λ / 4 wavelength transmission line, which enables downsizing, integration, reduction in the number of parts, and cost reduction.

[0012]

EXAMPLES The present invention will be described in detail below with reference to examples. FIG. 1 shows an embodiment of a multi-band antenna duplexer according to the present invention. Similar to the conventional example of FIG. 4, only the downlink common terminal T _DC is common, and the uplink terminals are different terminals T _U1 and T _U2 , respectively. The difference from the conventional FIG. 4 is that, instead of the λ / 4 transmission lines 43 and 44 of FIG. ,
This is the point where the antenna duplexers 11 and 12 are connected. Therefore, the configuration of the antenna duplexers 11 and 12 itself is the same as the conventional one.

Conventionally, the λ / 4 transmission line is used because the impedance at the terminals is adjusted so that the impedance of the band of the other is ∞ in order to eliminate mutual interference between the filters. is there. In the present invention, the values of the capacitors 13 and 14 and the resonators 15 and 16 are changed from the values of a single resonator so that the impedance of the other band becomes ∞ in the frequency bands of the respective downlink lines. It is realized by setting the value.

According to this embodiment, the capacitor is small and inexpensive, and its mounting can be performed very easily by soldering, and the value originally configured in each antenna duplexer is simply changed. Thereby, the whole structure can be easily integrated. Further, in this integrated structure, the number of parts does not increase at all, and the assembling work can be significantly shortened.

FIG. 2 is a block diagram showing another embodiment of the multi-band antenna duplexer according to the present invention, in which terminals are made common to both the downlink and the uplink. That is, antenna duplexer 2
Reference numerals 1 and 22 are ordinary antenna duplexers similar to those shown in FIG. 3, and their downlink terminals T _D1 and T _D2 are combined as one downlink common terminal T _DC via capacitors 23 and 24, and further uplink The terminals T _U1 and T _U2 are also grouped as one upstream common terminal T _UC via the capacitors 25 and 26. Here, the capacitors 23 to 26 are capacitors for both matching and connection.

According to this embodiment, as in the case of FIG.
This has the effects of reducing the number of parts, shortening the assembly time, lowering the cost, and facilitating integration. In addition, common repeaters of analog and digital systems can be connected and used in both the up and down directions. It should be noted that it is easy to share only the upstream terminal with the same configuration as in FIG.

[0017]

According to the present invention, it is possible to realize a multi-band antenna duplexer which has a small number of parts, a short assembly time, a low cost, and an easy integrated structure.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a multi-band antenna duplexer according to the present invention.

FIG. 2 is a configuration diagram showing another embodiment of a multi-band antenna duplexer according to the present invention.

FIG. 3 is an equivalent circuit diagram showing a configuration example of a normal antenna duplexer.

FIG. 4 is a diagram showing a configuration example of a conventional multi-band antenna duplexer.

[Explanation of symbols]

 11, 12, 21, 22 Antenna duplexer 13, 14 Capacitor 15, 16 Resonator 23-26 Capacitor 310-314 Resonator 315-319 Resonator 321-324 Coupling capacitor 325-328 Coupling capacitor 331-334 For matching Capacitor

Claims (3)

[Claims] 1. A first frequency band first downlink signal transmitted / received via a first antenna is connected to a downlink terminal thereof and a second frequency band second downlink signal is transmitted / received via the first antenna. A first antenna duplexer for connecting one uplink signal to its uplink terminal, and a second downlink signal in the third frequency band transmitted and received via the second antenna to its downlink terminal; A second antenna duplexer for connecting a second uplink signal in the fourth frequency band transmitted and received via the second antenna to its uplink terminal, and a multiband antenna duplexer configured by using: One common terminal is provided, the down terminal of the first antenna duplexer is connected to the common terminal via the first capacitor, and the down terminal of the second antenna duplexer is connected to the common terminal and the second terminal. Conde Antenna duplexer for multi-band, characterized in that formed by connecting via the service. 2. A first frequency band first downlink signal transmitted / received via a first antenna is connected to a downlink terminal thereof, and a second frequency band second transceiver is transmitted / received via the first antenna. A first antenna duplexer for connecting one uplink signal to its uplink terminal, and a second downlink signal in the third frequency band transmitted and received via the second antenna to its downlink terminal; A second antenna duplexer for connecting a second uplink signal in the fourth frequency band transmitted and received through the second antenna to its uplink terminal, and a multiband antenna duplexer configured using One common terminal is provided, the upstream terminal of the first antenna duplexer is connected to the common terminal via the first capacitor, and the upstream terminal of the second antenna duplexer is connected to the common terminal and the second terminal. Conde Antenna duplexer for multi-band, characterized in that formed by connecting via the service. 3. A second frequency band connected to a downlink terminal of a first downlink signal of a first frequency band transmitted / received via a first antenna and transmitted / received via said first antenna. A first antenna duplexer for connecting the first uplink signal to its uplink terminal, and a second downlink signal in the third frequency band transmitted and received via the second antenna to its downlink terminal; A second antenna duplexer for connecting a second uplink signal in the fourth frequency band transmitted and received through the second antenna to its uplink terminal; and a multiband antenna duplexer configured using In, the first and second common terminals are provided, and the down terminal of the first antenna duplexer is connected to the first common terminal via the first capacitor, and the second antenna duplexer of the second antenna duplexer is connected. The down terminal is the above first A common terminal is connected via a second capacitor, an upstream terminal of the first antenna duplexer is connected to the second common terminal via a third capacitor, and an uplink of the second antenna duplexer is connected. A multi-band antenna duplexer, characterized in that the terminal is connected to the second common terminal through a fourth capacitor.