KR20060061943A - Triplexer circuit of mobile terminal - Google Patents

Abstract

The present invention relates to a triplexer circuit of a mobile communication terminal, and more particularly, to a triplexer circuit capable of separating input signals having three different frequency bands.

The present invention has one input terminal 1, a first output terminal 2 for outputting a first frequency, a second output terminal 2 for outputting a second frequency band, and a third frequency output terminal for outputting a third frequency band ( 4). By using the present invention, the insertion loss is less than 1dB as a whole, and there is an advantage in that the problem of signal attenuation on other bands can be solved. In addition, like the active switch in the three frequency divider role, the same performance or more can be realized, and the advantages of improving the static electricity, which is a disadvantage of the active element, and the low-cost phone triband terminal through space utilization in the PCB circuit can be realized. .

Tri-Band, GPS, Triple Band

Description

Triplexer circuit of mobile terminal {TRIPLEXER CIRCUIT OF MOBILE TERMINAL}             

1 is a view showing a diplexer circuit of a dual band communication terminal according to the prior art;

2 is an equivalent circuit of a triplexer according to an embodiment of the present invention.

3A to 3C are diagrams illustrating insertion loss characteristics of the triplexer according to the embodiment of the present invention.

The present invention relates to a triplexer circuit of a mobile communication terminal, and more particularly, to a triplexer circuit capable of separating input signals having three different frequency bands.

Recently, in order to provide more various services, a mobile communication system includes a diplexer capable of simultaneously receiving and separating two different frequency bands through a single antenna, thereby having a signal having two frequency bands. Dual-band terminals that can handle together appeared.

In general, a dual band mobile communication terminal receives signals of different frequency bands, for example, signals of the CDMA frequency band (about 824-894 MHz) and the PCS frequency band (about 1850-1990 MHz) as one input terminal, and outputs them to two output terminals. Each has a diplexer that can be separated. An example of such a diplexer is Korea Patent Publication No. 2002-60344.

1 is a diagram illustrating a diplexer circuit of a dual band communication terminal according to the prior art.

Referring to FIG. 1, a resonant circuit including a capacitor C1 and an inductor L1 reflecting a frequency other than a cellular frequency band from a high frequency signal received through an antenna Ant and one side of the resonant circuit are grounded. A cellular frequency path configured to connect cellular capacitors C3 in parallel to separate cellular frequency bands; A short resonator 200 comprising a capacitor C2 and an inductor L2 for reflecting a frequency other than the PCS frequency band from a high frequency signal received through the antenna Ant and a frequency band output through the short resonator are selected. The open resonator 100, which improves the diagram, is connected to the PCS frequency path configured to separate the PCS frequency band.

In addition, as the GPS function is added to the mobile communication terminal, a triple band method capable of separating and processing three frequency bands is required. The triplexer is used to implement such a triple band scheme. The triplexer is used as a frequency divider of the RF stage in quad-mode and tri-mode terminals, and is used as a circuit structure in a chip form and a proper circuit implementation on a PCB by implementing a discrete circuit.

According to the conventional triple band method, even if an additional component is mounted in a terminal or implemented as a single type of circuit, it is not easy to obtain satisfactory frequency selectivity.

Accordingly, an object of the present invention is to provide a triplexer capable of accurately extracting a desired frequency band without requiring an additional device to solve the above-described problems of the prior art.

In addition, an object of the present invention is to provide a triplexer with improved insertion loss (IL), better attenuation (Atten) characteristics and branching characteristics in a triplexer implemented in one chip.

Triplexer according to the present invention for achieving the above object,

A triplexer for separating a signal received from an input terminal into first, second and third frequency bands,

A first short resonator connected to one end of the input terminal and separating a first frequency band, an inductor 20 connected in series to the first short resonator, and a first open connected to one end of the inductor 20 A first frequency for outputting the first frequency, including a resonant part, to improve attenuation of a band signal other than the first frequency band, and to improve selectivity of the first open resonator part by the inductor 20; An output unit; A third short resonator connected to one end of the second short resonator and a second short resonator configured to reflect a frequency band other than a second frequency band from a received signal; A second frequency output part including a second open resonator part connected to one end of the resonator part, and outputting the second frequency band by improving the selectivity of the second frequency band by the second open resonator part; A third frequency output part including a third open resonance part connected to the input end thereof to separate a third frequency band and to improve signal attenuation of the first frequency band and the second frequency band; do.

In addition, at least one of the first open resonator and the second open resonator,

And a series circuit composed of a capacitor and an inductor connected in series with one end of the ground and a capacitor having one end connected in parallel with the series circuit and grounded at the other end.

In addition, the third shot resonance unit

One end is a grounded capacitor and a parallel circuit connected in series with the capacitor, the parallel circuit is characterized in that the capacitor and the inductor is a circuit connected in parallel.

In addition, the third open resonator unit

And an inductor once connected to the input terminal and a series circuit connected in parallel with the inductor, wherein the series circuit includes a capacitor and an inductor having one end connected in series with the capacitor and the other end grounded.

DETAILED DESCRIPTION A detailed description of preferred embodiments of the present invention will now be described with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In the following examples, the definitions of terms are as follows. First, the first frequency band means 824-894 MHz, which is a CDMA frequency band, the second frequency band, 1850-1990 MHz, which is a PCS frequency band, and the third frequency band, 1570-1580 MHz, which is a GPS frequency band.

2 is an equivalent circuit of a triplexer according to an embodiment of the present invention.

Referring to FIG. 2, the triplexer according to the present invention includes one input terminal 1, a first output terminal 2 for outputting a first frequency, a second output terminal 2 for outputting a second frequency band, and a third frequency. And a third frequency output stage 4 for outputting the band.

A circuit constituting a path from the input terminal 1 to the first frequency output terminal 2 is called a first frequency output unit, and a circuit constituting a path from the input terminal 1 to the second frequency output terminal 3. Denotes a second frequency output unit, and a circuit constituting a path from the input terminal 1 to the third frequency output terminal 4 is defined as a first frequency output unit.

The first frequency output unit includes a first short resonator 10 connected to one end of the input terminal 1, an inductor 20 connected to the first short resonator 10, and a first open resonator 30 connected to the inductor 20. It is configured by. The first frequency output unit improves attenuation of another band signal by a two-stage resonator including the first short resonator 10 and the first open resonator 30, and improves the attenuation of another band signal by the inductor 20. Improve the selectivity of open resonance.

The first short resonator unit includes a parallel circuit having a capacitor C1 and an inductor L1 connected in parallel, and a capacitor C3 connected to one end of the parallel circuit and grounded at the other end thereof. In addition, as shown, the first open resonator unit is connected to the capacitor C4 and the capacitor C4 in series, one end of the series circuit consisting of the inductor L4 and one end connected in parallel with the series circuit and the other end is grounded capacitor C10 It is configured to include.

The second frequency output unit is connected to one end of the second short resonator 40 connected to the input terminal 1, the third short resonator 50 connected to one end of the second short resonator 40, and the third short resonator 50. It is configured to include a second open resonator 60. The second frequency output unit effectively reflects different frequency bands by two-stage parallel resonance including the second short resonator 40 and the third short resonator, and the second open resonator 60 to improve selectivity, The selectivity of the second frequency band is improved by the second open resonator 60.

The second short resonator 40 includes a parallel circuit composed of a capacitor C2 and an inductor L2 connected in parallel, and an inductor L7 having one end connected to the parallel circuit and grounded at the other end. In addition, the third short resonator unit 50 includes a parallel circuit composed of a capacitor C8 and an inductor L5, one end of which is connected in series to the capacitor C8 and the capacitor C8. The second open resonator 60 includes a capacitor C6 and a series circuit including an inductor L6 having one end grounded in series and a capacitor C11 having one end connected in parallel with the series circuit and the other end grounded. It is composed.

The third frequency output part includes a third open resonator part 70 having one end connected to the input terminal 1 to separate a third frequency band and to improve signal attenuation of the first frequency band and the second frequency band. It is configured by. The third open resonator 70 includes an inductor L10 for securing selectivity of a third frequency band from an input signal, an inductor L10, a capacitor C9, and an inductor L11 connected in series with the capacitor C9. The third frequency output unit may be configured to further include a GPS SAW filter 80, wherein the GPS SAW filter can be applied to any commercial model.

3A to 3C are diagrams illustrating insertion loss characteristics of the triplexer according to the embodiment of the present invention.

The value of each device for implementing the triplexer according to the embodiment of the present invention configured as described above is determined for insertion loss (IL) and performance optimization, and FIGS. 3A to 3C are measured by the following device values. One result.

C1 = 1pF, L1 = 3.3nH, C3 = 1pF, L3 = 3nH, C4 = 5pF, L4 = 1.5nH, C10 = 2pF

C2 = 7pF, L7 = 3.9nH, C8 = 2pF, C5 = 5pF, L5 = 5.6nH, C6 = 4pF, L6 = 2.7nH, C11 = 4pF

L10 = 3.9nH, C9 = 1.5pF, L11 = 1nH

FIG. 3A shows the insertion loss characteristic between the input terminal 1 and the first frequency output terminal 2, FIG. 3B shows the insertion loss characteristic between the input terminal 1 and the second frequency output terminal 3, FIG. 3C Is a diagram showing insertion loss characteristics between the input terminal 1 and the third frequency output terminal 4.

The insertion loss measured in FIG. 3A is m1 (824.0 MHz) = -0.959 dB, m2 (894.0 MHz) = -1.00 dB, m18 (849.0 MHz) = -0.697 dB, m19 (569.0 MHz) = -0.650 dB, m9 (1.575 GHz) = -24.125 dB, m14 (1.850 GHz) = -48.578 dB, m15 (1.990 GHz) = -32.006 dB.

The insertion loss measured in FIG. 3B is m5 (824.0 MHz) = -38.121 dB, m6 (894.0 MHz) = -52.082 dB, m8 (1.575 GHz) = -31.782 dB, m10 (1.850 GHz) = -1.155 dB, m11 (1.990 GHz) = -0.761 dB, m16 (1.910 GHz) = -0.549 dB, m17 (1.930 GHz) = -0.584 dB.

The insertion loss measured in FIG. 3C is m3 (824.0 MHz) = -20.490 dB, m4 (894.0 MHz) = -15.81 dB, m7 (1.575 GHz) = -0.937 dB, m12 (1.850 GHz) = -21.669 dB, m13 (1.990 GHz) = -28.113 dB.

Referring to the measurement results of FIGS. 3A to 3C, it can be seen that the insertion loss of the corresponding frequency band is within 1 dB as a whole, and it is possible to solve the problem of signal attenuation on other bands.

While the invention has been described above based on the preferred embodiments thereof, these embodiments are intended to illustrate rather than limit the invention. It will be apparent to those skilled in the art that various changes, modifications, or adjustments to the above embodiments can be made without departing from the spirit of the invention. Therefore, the protection scope of the present invention should be construed to include not only the appended claims but also all of the above changes, modifications or adjustments.

As described above, the present invention does not require an additional device, and it is possible to extract the desired frequency band accurately, and in the triplexer implemented with one chip, the triple insertion loss, better attenuation and branching characteristics are improved. It is possible to provide a lexer.

That is, using the present invention, the insertion loss is less than 1dB as a whole, there is an advantage that can solve the problem of signal attenuation on the other band. In addition, like the active switch in the three frequency divider role, the same performance or more can be realized, and the advantages of improving the static electricity, which is a disadvantage of the active element, and the low-cost phone triband terminal through space utilization in the PCB circuit can be realized. . As a result, the present invention has the advantage of implementing an optimal tri-band terminal by improving the insertion loss and signal attenuation than the present technology.

Claims (4)

A triplexer for separating a signal received from an input terminal into first, second and third frequency bands, A first short resonator connected to one end of the input terminal and separating a first frequency band, an inductor 20 connected in series to the first short resonator, and a first open connected to one end of the inductor 20 A first frequency output for outputting the first frequency, including a resonant part, to improve attenuation of a band signal other than the first frequency band, and to improve selectivity of the first open resonator part by the inductor 20; Wealth; A third short resonator connected to one end of the second short resonator and a second short resonator configured to reflect a frequency band other than a second frequency band from a received signal; A second frequency output part including a second open resonator part connected to one end of the resonator part, and outputting the second frequency band by improving the selectivity of the second frequency band by the second open resonator part; A third frequency output part including a third open resonance part connected to the input end thereof to separate a third frequency band and to improve signal attenuation of the first frequency band and the second frequency band; Triplexer, characterized in that. The method of claim 1, wherein at least one of the first open resonator unit or the second open resonator unit is: And a series circuit comprising a capacitor and an inductor connected in series with the capacitor and grounded at one end thereof, and a capacitor connected at the one end in parallel with the series circuit and grounded at the other end thereof. The method of claim 1, wherein the third short resonator unit And a parallel circuit having one end grounded in series and a parallel circuit connected to the capacitor, wherein the parallel circuit is a circuit in which the capacitor and the inductor are connected in parallel. The method of claim 1, wherein the third open resonator portion And an inductor once connected to the input terminal and a series circuit connected in parallel with the inductor, wherein the series circuit includes a capacitor and an inductor having one end connected in series with the capacitor and the other end grounded.

Images