Triplexer filter

Abstract

The utility model discloses a triplexer filter comprising a housing and a circuit board arranged in the housing, the circuit board is provided with a circuit, and the circuit comprises a first duplexer circuit and a second duplexer circuit; the first duplexer circuit comprises a first input end and two first output ends, the second duplexer circuit comprises a second input end and two second output ends, and the input end of the second duplexer circuit is connected with one output end of the first duplexer circuit. According to the utility model, two groups of duplexer circuits are combined to form a new circuit diagram, the waveform disorder phenomenon is avoided, a matching circuit does not need to be added, and optimization can be completed only by debugging capacitors and inductors. According to the utility model, the number of required components is small, additional component matching circuits are not needed, and the advantages of the duplexer are larger when the passbands of the two duplexer circuits are closer, the frequency requirement is higher and the number of the filter banks is larger.

Description

Technical Field

[0001] The utility model relates to the field of triplexer design, in particular to a triplexer filter. Background Art

[0002] A triplex filter is a hybrid filter consisting of three filters: a low-pass filter, a band-pass filter, and a high-pass filter. Its operating principle is to separate and process signals of different frequencies through the combination of these three filters. Triplex filters are typically used to separate input signals into first, second, and third frequency bands, and have a multi-layered structure.

[0003] In the prior art, the circuit diagram of the triplex filter is as follows: Figure 1 As shown, the simulation waveform is as follows Figure 2 As shown, it is obvious that when multiple filter combinations are required and the ports are shared, the mutual suppression of the filters will interfere with each other, resulting in passband collapse and signal loss, making matching difficult. Utility Model Content

[0004] The present invention overcomes the shortcomings of the prior art triplex filters, such as large interference and difficulty in matching, and provides a triplex filter. To achieve the above-mentioned purpose, the present invention adopts the following technical solution: a triplex filter, comprising: a housing and a circuit board disposed in the housing, the circuit board being provided with a circuit, the circuit comprising a first duplexer circuit and a second duplexer circuit;

[0005] The first duplexer circuit includes a first input terminal and two first output terminals, the second duplexer circuit includes a second input terminal and two second output terminals, and the input terminal of the second duplexer circuit is connected to one output terminal of the first duplexer circuit.

[0006] In a preferred embodiment of the present invention, the duplexer circuit includes a high-pass circuit and a low-pass circuit, and an input end of the high-pass circuit is connected to an input end of the low-pass circuit.

[0007] In a preferred embodiment of the present invention, the low-pass circuit includes four inductors connected in series, a capacitor to ground is provided between two adjacent inductors, one end of the capacitor is connected between the two adjacent inductors, and the other end of the capacitor is grounded.

[0008] In a preferred embodiment of the present invention, the high-pass circuit includes four capacitors connected in series, an inductor to ground is provided between two adjacent capacitors, one end of the inductor is connected between the two adjacent capacitors, and the other end of the inductor is grounded.

[0009] In a preferred embodiment of the present invention, the high-pass circuit output end of the first duplexer circuit is connected to the input end of the second duplexer circuit.

[0010] In a preferred embodiment of the present invention, the input end of the high-pass circuit and the input end of the low-pass circuit in the first duplexer circuit are connected to form a first input end; the input end of the high-pass circuit and the input end of the low-pass circuit in the second duplexer circuit are connected to form a second input end.

[0011] In a preferred embodiment of the present invention, no bandpass circuit is provided in the circuit.

[0012] In a preferred embodiment of the present invention, the capacitance value and the inductance value in the first duplexer circuit are different from the capacitance value and the inductance value in the second duplexer circuit.

[0013] The present invention solves the defects in the background technology and has the following beneficial effects:

[0014] This new design combines two duplexer circuits to create a new circuit diagram, eliminating waveform distortion and requiring no additional matching circuits. Optimization can be achieved simply by adjusting the capacitors and inductors. This design requires fewer components and eliminates the need for additional matching circuits. Its advantages are particularly pronounced when the passbands of the two duplexer circuits are closer, the frequency requirements are higher, and the number of filter banks increases. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, they can also obtain drawings of other embodiments based on these drawings.

[0016] Figure 1 It is a circuit diagram of a triplex filter in the prior art;

[0017] Figure 2 This is a simulation diagram of a triplex filter circuit in the prior art;

[0018] Figure 3 This is a circuit diagram of a triplex filter described in an embodiment of the present utility model;

[0019] Figure 4 This is a simulation curve of the triplex filter described in one embodiment of the present utility model;

[0020] Figure 5 This is a simulation curve after optimization of the triplex filter described in one embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to more clearly understand the above-mentioned purposes, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner. Therefore, they only show the structures related to the present invention. It should be noted that, unless there is a conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0024] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present invention.

[0025] The utility model discloses a three-way filter, which is characterized by comprising: a housing and a circuit board arranged in the housing, wherein the circuit board is provided with a circuit, such as Figure 3 As shown, the circuit includes a first duplexer circuit and a second duplexer circuit.

[0026] The first duplexer circuit includes a first input terminal and two first output terminals, the second duplexer circuit includes a second input terminal and two second output terminals, and the input terminal of the second duplexer circuit is connected to one output terminal of the first duplexer circuit.

[0027] The duplexer circuit includes a high-pass circuit and a low-pass circuit, and the input end of the high-pass circuit is connected to the input end of the low-pass circuit. It should be noted that the entire circuit of the circuit board in the present invention does not include a bandpass circuit.

[0028] Continue to refer to Figure 3 As shown, the circuit structures of the first duplexer circuit and the second duplexer circuit are the same. Taking the first duplexer circuit as an example, the first duplexer circuit includes a high-pass circuit and a low-pass circuit.

[0029] The low-pass circuit includes four inductors connected in series, with a ground capacitor provided between two adjacent inductors, one end of the capacitor connected between the two adjacent inductors, and the other end of the capacitor grounded. The high-pass circuit includes four capacitors connected in series, with an inductor provided between two adjacent capacitors, one end of the inductor connected between the two adjacent capacitors, and the other end of the inductor grounded.

[0030] The output terminal of the high-pass circuit of the first duplexer circuit is connected to the input terminal of the second duplexer circuit. The input terminal of the high-pass circuit in the first duplexer circuit is connected to the input terminal of the low-pass circuit to form a first input terminal; the input terminal of the high-pass circuit in the second duplexer circuit is connected to the input terminal of the low-pass circuit to form a second input terminal.

[0031] That is to say, the input end of the first duplexer circuit is also the input end of the circuit board, and the output end of the low-pass circuit in the first duplexer circuit, the output end of the low-pass circuit in the second duplexer circuit, and the output end of the high-pass circuit in the second duplexer circuit are also the three output ends of the circuit board.

[0032] The utility model combines two sets of duplexer circuits to form a new circuit diagram, and obtains the simulation curve as follows: Figure 4 As shown, there is no waveform disorder phenomenon, no need to add matching circuit, and the optimization can be completed by adjusting the capacitance and inductance. Finally, the simulation curve is obtained by adjusting the capacitance and inductance. Figure 5 Obviously, the triplex filter described in the present invention is simpler and more convenient to match, and has fewer interference factors. It should be noted that the capacitance and inductance values ​​in the first duplexer circuit are different from those in the second duplexer circuit, and can be flexibly adjusted according to actual conditions.

[0033] The utility model requires fewer components and does not require additional component matching circuits. The advantages are greater when the passbands of the two groups of duplexer circuits are closer, the frequency requirements are higher, and the number of filter groups is greater.

[0034] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, and these variations and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A triplex filter, characterized in that: include: A housing and a circuit board disposed in the housing, wherein the circuit board is provided with a circuit, the circuit including a first duplexer circuit and a second duplexer circuit; The first duplexer circuit includes a first input terminal and two first output terminals, the second duplexer circuit includes a second input terminal and two second output terminals, and the input terminal of the second duplexer circuit is connected to one output terminal of the first duplexer circuit.

2. A triplex filter according to claim 1, characterized in that: The duplexer circuit includes a high-pass circuit and a low-pass circuit, and an input end of the high-pass circuit is connected to an input end of the low-pass circuit.

3. A triplex filter according to claim 2, characterized in that: The low-pass circuit includes four inductors connected in series, a capacitor to ground is provided between two adjacent inductors, one end of the capacitor is connected between the two adjacent inductors, and the other end of the capacitor is grounded.

4. A triplex filter according to claim 2, characterized in that: The high-pass circuit includes four capacitors connected in series, an inductor to ground is provided between two adjacent capacitors, one end of the inductor is connected between the two adjacent capacitors, and the other end of the inductor is grounded.

5. The triplex filter according to claim 1, wherein: An output end of the high-pass circuit of the first duplexer circuit is connected to an input end of the second duplexer circuit.

6. The triplex filter according to claim 1, characterized in that: The input end of the high-pass circuit and the input end of the low-pass circuit in the first duplexer circuit are connected to form a first input end; the input end of the high-pass circuit and the input end of the low-pass circuit in the second duplexer circuit are connected to form a second input end.

7. The triplex filter according to claim 1, characterized in that: No bandpass circuit is provided in the circuit.

8. The triplex filter according to claim 1, characterized in that: The capacitance value and the inductance value in the first duplexer circuit are different from the capacitance value and the inductance value in the second duplexer circuit.

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