Unequal phase two-path filter circuit and electronic device thereof

Abstract

The application discloses an unequal-phase two-way filter circuit and an electronic device thereof, wherein the unequal-phase two-way filter circuit is used for simultaneously realizing filter functions and conversion functions between balanced signals and unbalanced signals, and comprises a circuit metal layer, a microwave dielectric plate, a lower metal plate and a metallized via; the circuit metal layer is arranged on the upper surface of the microwave dielectric plate; the lower metal plate is arranged on the lower surface of the microwave dielectric plate and is grounded; the metallized via vertically penetrates the microwave dielectric plate, connects the upper and lower metal layers and is used for realizing circuit grounding; the circuit metal layer comprises a port Port1, a port Port2, a port Port3, a transmission unit Unit1, an isolation unit Unit2 and a phase-shifting unit Unit3.

Description

Technical Field

[0001] This invention belongs to the field of microwave technology, and particularly relates to an unequal phase dual-path filter circuit and its electronic device. Background Technology

[0002] With the rapid development of wireless communication technology, the demand for filters and balanced circuit components is gradually increasing. In current circuit systems, filters and balanced circuit components are usually cascaded together. This simple cascading method leads to increased power loss, larger circuit size, and other problems. A balun is a device that connects balanced and unbalanced transmission line circuits by converting matched inputs into two differential outputs with the same amplitude but different phases. Bandpass filters are frequency-selective devices that play a crucial role in microwave RF front-ends. Combining these two technologies can reduce power loss caused by device mismatch and also reduce device size. Currently, with the continuous increase in the functionality of wireless communication systems, more and more devices need to be integrated, requiring each device to be as small as possible. Because integrated passive device (IPD) technology has advantages such as high processing precision and ease of integration into systems, devices designed based on this technology are very suitable for integration into wireless communication systems. Summary of the Invention

[0003] The purpose of this invention is to propose an unequal-phase dual-path filter circuit that can simultaneously achieve frequency selection and conversion between balanced and unbalanced signals, while also being miniaturized and highly isolated.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an unequal-phase dual-path filter circuit, comprising a circuit metal layer, a microwave dielectric substrate, a lower metal plate, and metallized vias; the circuit metal layer is disposed on the upper surface of the microwave dielectric substrate; the lower metal plate is disposed on the lower surface of the microwave dielectric substrate and grounded; the metallized vias vertically penetrate the microwave dielectric substrate, connecting the upper and lower metal layers, and are used to achieve circuit grounding; the circuit metal layer includes Port1, Port2, Port3, a transmission unit Unit1, an isolation unit Unit2, and a phase-shifting unit Unit3;

[0005] Ports Port1, Port2, and Port3 are made of metallized material and are used for signal input or output. Port1 is connected to the first end of transmission unit Unit1, which performs filtering and conversion between single-ended and differential signals. The second end of transmission unit Unit1 is connected to both Port2 and the first end of isolation unit Unit2. Isolation unit Unit2 isolates the first and second signals to prevent interference. The third end of transmission unit Unit1 is connected to the first end of phase-shifting unit Unit3, which changes the phase of the second signal without changing its amplitude. The second end of phase-shifting unit Unit3 is connected to both Port3 and the second end of isolation unit Unit2.

[0006] Based on the unequal-phase dual-path filter circuit structure, this circuit has two operating modes, A and B. Mode A: Port1 receives the input signal, which is filtered by the transmission unit Unit1 and converted into a first output signal and a second output signal. The first output signal is output by Port2. The second output signal is output by Port3 after its phase is changed by the phase-shifting unit Unit3. The isolation unit Unit2 is connected between Port2 and Port3 to ensure that the first and second output signals do not interfere with each other. Mode B: Port2 and Port3 receive two input signals. The input signal received by Port3 is input to the phase-shifting unit Unit3, and after its phase is changed by the phase-shifting unit Unit3, it is input to the transmission unit Unit1. The input signal received by Port2 is directly input to the transmission unit Unit1. The two input signals input to the transmission unit Unit1 are filtered and then combined into one output signal, which is output from Port1. The isolation unit Unit2 ensures that the two input signals do not interfere with each other.

[0007] Furthermore, the aforementioned transmission unit Unit1 includes a capacitor. C 1. Capacitor C 2. Capacitor C 3. Inductance L 1. Inductor L’ 1. Inductor L 2. Inductance L’ 2; Inductance L’ One end serves as the first end of transmission unit Unit1, and the inductor... L’ 1. A capacitor is connected to the other end. C 1. One end, inductor L’ 2. One end, capacitor C 3. One end; C 3. The other end is grounded; inductor L’ 2. The other end serves as the second end of transmission unit Unit 1; capacitor CThe other end of 1 is also connected to a capacitor. C 2. One end, inductor L 2. One end, inductor L 1. One end; inductor L The other end of 1 is grounded; inductor L 2. The other end serves as the third end of the transmission unit Unit1; the inductor L 1、 inductance L’ 1 is configured such that inductive coupling exists between them; the inductor L 2、 inductance L’ 2 is configured such that there is inductive coupling between them.

[0008] Furthermore, the aforementioned transmission unit Unit 1 also includes grounding pad 1 and grounding pad 2 made of metallized material, with grounding pad 1 and grounding pad 2 respectively connected to the lower metal plate through metallized through-holes; inductor L 1 is connected to ground Pad1, and capacitors C2 and C3 are connected to ground Pad2.

[0009] Furthermore, the aforementioned isolation unit Unit2 includes a capacitor. C 4. Capacitor C 5. Capacitors C 6. Inductor L 3. Inductance L’ 3. Inductance L 4. Inductance L’ 4. Resistance R 1; Inductance L’ 3 One end serves as the first end of the isolation unit Unit2, inductor L’ 3. Connect capacitors to the other end. C 4. One end, inductor L’ 4. One end, capacitor C 6. One end; capacitor C The other end of 6 is grounded; capacitor C The other end of 4 is also connected to a capacitor. C 5. One end, inductor L 3. One end, inductor L 4. One end; capacitor C The other end of 5 is grounded; inductor L 3. The other end serves as the second end of the isolation unit Unit2; inductor L 4. The other end is connected to the inductor L’ 4. The other end is connected to a common resistor. R 1. One end, resistor R The other end of 1 is grounded; the inductor L 3、 inductance L’ 3 are configured such that inductive coupling exists between them; the inductorL 4、 inductance L’ 4 is configured such that there is inductive coupling between them.

[0010] Furthermore, by adjusting the aforementioned inductance L 3 and inductance L’ 3. Length and spacing, inductance L 4 and inductance L’ 4. Length and spacing, resistance R The size of 1, and the capacitance C 4. Capacitor C 5. Capacitors C The size of 6 achieves the desired isolation effect within the passband, meeting preset requirements.

[0011] Furthermore, the aforementioned isolation unit Unit2 also includes a grounding pad 3 made of metallized material, which is connected to the lower metal plate through a metallized through-hole; capacitor C 5. Capacitors C 6. Resistance R 1 is connected to the ground Pad3.

[0012] Furthermore, the aforementioned phase-shifting unit Unit3 includes a capacitor. C 7. Capacitors C 8. Capacitors C 9. Inductor L 5. Inductance L’ 5. Inductance L 6; Inductance L 5. One end serves as the first terminal of the phase-shifting unit Unit3, and the inductor... L 5. A capacitor is connected to the other end at the same time. C 7. One end, capacitor C 8 One end, inductor L 6. One end; capacitor C The other end of 8 is grounded; inductor L The other end of 6 is grounded; capacitor C 7. A capacitor is connected to the other end. C 9. One end, inductor L’ 5. One end; capacitor C The other end of 9 is grounded; inductor L’ 5. The other end serves as the second end of the phase-shifting unit Unit 3; the inductor L 5. Inductance L’ 5 is configured such that there is inductive coupling between them.

[0013] Furthermore, the aforementioned phase-shifting unit Unit3 adjusts the inductor... L 5 and inductance L’ 5. Length and spacing, inductance L 6 length and capacitance C7. Capacitors C 8. Capacitors C The size of 9 allows the first signal and the second signal to meet the preset phase difference requirements.

[0014] Furthermore, the aforementioned phase-shifting unit Unit3 also includes a grounding pad 4 made of metallized material, which is connected to the lower metal plate through a metallized through-hole; inductor L 6. Capacitors C 8. Capacitors C 9 is connected to the ground Pad4.

[0015] Furthermore, the aforementioned inductor L 1. Inductor L’ 1. Inductor L 2. Inductance L’ 2. Inductance L 3. Inductance L’ 3. Inductance L 4. Inductance L ’ 4. Inductance L 5. Inductance L’ 5. Inductance L All 6 are implemented using metallized transmission lines, and their projection on the plane of the lower metal plate is composed of a combination of straight lines and arcs.

[0016] Furthermore, the aforementioned resistor R1 is implemented using a high-precision thin-film resistor, and the capacitor... C 1. Capacitor C 2. Capacitor C 3. Capacitor C 4. Capacitor C 5. Capacitors C 6. Capacitors C 7. Capacitors C 8. Capacitors C Each of the nine is composed of two opposing rectangular metallized electrodes coupled together.

[0017] Furthermore, an electronic device includes the aforementioned unequal-phase dual-path filter circuit.

[0018] The unequal-phase dual-path filter circuit of this invention, compared with the prior art, has the following technical advantages:

[0019] (1) The unequal phase dual-path filter circuit proposed in this invention has good filtering characteristics in the passband and excellent passband isolation, and can realize the conversion between balanced and unbalanced signals.

[0020] (2) The unequal phase dual-path filter circuit proposed in this invention has a size of only 0.12 λg×0.15 λg (λg: waveguide wavelength of center frequency), and features small size, light weight, simple processing, easy integration and low manufacturing cost. Attached Figure Description

[0021] Figure 1 This is a 45° view structural diagram of the unequal phase dual-path filter circuit proposed in this invention;

[0022] Figure 2 This is a layered cross-sectional schematic diagram of the unequal-phase dual-path filter circuit proposed in this invention;

[0023] Figure 3 This is a physical structure diagram of the unequal-phase dual-path filter circuit proposed in this invention;

[0024] Figure 4 This is the equivalent circuit diagram of the unequal-phase dual-path filter circuit proposed in this invention;

[0025] Figure 5 This is a diagram showing the return loss and insertion loss performance of Port1 of the unequal-phase dual-path filter circuit proposed in this invention.

[0026] Figure 6 This is a performance diagram of the return loss and isolation between ports Port2 and Port3 of the unequal phase dual-path filter circuit proposed in this invention.

[0027] Figure 7 This is a phase difference performance diagram of Port2 and Port3 of the unequal phase dual-path filter circuit proposed in this invention. Detailed Implementation

[0028] To better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.

[0029] In this invention, various aspects of the invention are described with reference to the accompanying drawings, in which numerous illustrative embodiments are shown. Embodiments of the invention are not limited to those depicted in the drawings. It should be understood that the invention is implemented through any of the various concepts and embodiments described above, as well as the concepts and embodiments described in detail below, because the concepts and embodiments disclosed herein are not limited to any particular implementation. Furthermore, some aspects of the invention disclosed may be used alone or in any suitable combination with other aspects of the invention disclosed.

[0030] This invention proposes an unequal-phase dual-path filter circuit and its electronic device. The unequal-phase dual-path filter circuit simultaneously performs frequency selection and conversion between balanced and unbalanced signals. It includes a circuit metal layer, a microwave dielectric substrate, a lower metal plate, and metallized vias. Figure 1 , Figure 2 As shown, the circuit metal layer is disposed on the upper surface of the microwave dielectric substrate; the lower metal plate is disposed on the lower surface of the microwave dielectric substrate and grounded; the metallized via penetrates vertically through the microwave dielectric substrate, connecting the grounding pad in the circuit metal layer to the lower metal plate, for the purpose of grounding the circuit.

[0031] like Figure 3 As shown, the circuit metal layer includes three ports: Port1, Port2, and Port3; ground Pad1, Ground Pad2, Ground Pad3, and Ground Pad4; and a high-density parallel plate capacitor. C 1. Capacitor C 2. Capacitor C 3. Capacitor C 4. Capacitor C 5. Capacitors C 6. Capacitors C 7. Capacitors C 8. Capacitors C 9; Inductance realized by high-impedance transmission lines L 1. Inductor L’ 1. Inductor L 2. Inductance L’ 2. Inductance L 3. Inductance L’ 3. Inductance L 4. Inductance L’ 4. Inductance L 5. Inductance L’ 5. Inductance L 6; High-precision thin-film resistors R 1; where inductance is... L 1 and inductance L’ There is inductive coupling between 1 and 2, and inductance. L 2 and inductance L’ There is inductive coupling between the two, and the inductance... L 3 and inductance L’ There is inductive coupling between the three, and the inductance... L 4 and inductance L’ There is inductive coupling between 4, and inductance L 5 and inductance L’There is inductive coupling between the five elements. The coupling coefficient of each set of coupled inductors can be adjusted by changing the length and spacing of the two coupled inductors. Each parallel plate capacitor is composed of two opposing rectangular metallized electrodes coupled together, and the capacitance value can also be adjusted by changing the size of the capacitor. The projection of this circuit onto the plane of the lower metal plate is composed of a combination of straight lines and arcs.

[0032] like Figure 4 The equivalent circuit diagram is shown, the inductor L 1. Inductor L’ 1. Inductor L 2. Inductance L’ 2. Capacitor C 1. Capacitor C 2. Capacitor C 3. Grounding Pad1 and Grounding Pad2 constitute transmission unit Unit1, used to implement filtering functions and to convert between single-ended and differential signals; inductor L 3. Inductance L’ 3. Inductance L 4. Inductance L’ 4. Capacitor C 4. Capacitor C 5. Capacitors C 6. Resistance R 1. Grounding Pad3 forms isolation unit Unit2, used to ensure that the first signal and the second signal do not interfere with each other; inductor L 5. Inductance L’ 5. Inductance L 6. The grounding Pad4 forms the phase shifting unit Unit3, which is used to change the phase of the second signal but not the amplitude of the second signal.

[0033] Based on the unequal-phase dual-path filter circuit structure, this circuit has two operating modes, A and B. In mode A, port 1 receives the radio frequency (RF) signal. After the RF signal passes through transmission unit 1, it is split into a first signal and a second signal. The first signal is output from port 2, and the second signal is output from port 3 after passing through phase-shifting unit 3. Since phase-shifting unit 3 changes the signal phase but not the signal amplitude, the first signal output from port 2 and the second signal output from port 3 will have a 180° phase difference, but their amplitudes will be basically the same. In addition, the isolation unit Unit 2 isolates the radio frequency signals between Port 2 and Port 3, so that the signals of the two ports will not interfere with each other. In B mode, two radio frequency signals with basically the same amplitude are received by Port 2 and Port 3. The radio frequency signal received by Port 3 is input to the phase shift unit Unit 3. After the phase is changed by the phase shift unit Unit 3, it is input to the transmission unit Unit 1. The radio frequency signal received by Port 2 is directly input to the transmission unit Unit 1. The two radio frequency signals input to the transmission unit Unit 1 are filtered and then combined into one output signal and output from Port 1. The isolation unit Unit 2 ensures that the two signals of Port 2 and Port 3 do not interfere with each other.

[0034] In the simulation data of mode A, Figure 5 The figure shows the return loss and insertion loss performance of Port1 of the unequal phase dual-path filter circuit. The center frequency is 10GHz and the 3-dB relative bandwidth is 10% (9.5GHz-10.5GHz). Figure 6 The figure shows the performance of the return loss and isolation between ports Port2 and Port3 of the unequal phase dual-path filter circuit. The isolation within the passband is better than 30dB. Figure 7 The figure shows the phase difference performance of the unequal phase dual-path filter circuit at ports Port2 and Port3. As shown in the figure, the phase difference between the two signals at ports Port2 and Port3 satisfies 180±5°.

[0035] While the present invention has been described above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A dual-path filter circuit with unequal phase, used to simultaneously perform frequency selection and conversion between balanced and unbalanced signals; characterized in that, It includes a circuit metal layer, a microwave dielectric substrate, a lower metal plate, and metallized vias; the circuit metal layer is disposed on the upper surface of the microwave dielectric substrate; the lower metal plate is disposed on the lower surface of the microwave dielectric substrate and grounded; the metallized vias penetrate vertically through the microwave dielectric substrate, connecting the upper and lower metal layers, and are used to achieve circuit grounding; the circuit metal layer includes Port1, Port2, Port3, transmission unit Unit1, isolation unit Unit2, and phase shifting unit Unit3; Ports Port1, Port2, and Port3 are made of metallized material and are used for signal input or output. Port1 is connected to the first end of transmission unit Unit1, which performs filtering and conversion between single-ended and differential signals. The second end of transmission unit Unit1 is connected to both Port2 and the first end of isolation unit Unit2. Isolation unit Unit2 is used to isolate the two signals and prevent interference. The third end of transmission unit Unit1 is connected to the first end of phase-shifting unit Unit3, which changes the phase of the signal without changing its amplitude. The second end of phase-shifting unit Unit3 is connected to both Port3 and the second end of isolation unit Unit2. Based on the structure of the unequal-phase dual-path filter circuit, the filter circuit has two working modes, A and B. Mode A: Port 1 receives the input signal, which is filtered by transmission unit Unit 1 and converted into a first output signal and a second output signal. The first output signal is output by port 2. The second output signal is output by port 3 after its phase is changed by phase shifting unit Unit 3. Isolation unit Unit 2 is connected between port 2 and port 3 to ensure that the first output signal and the second output signal do not interfere with each other. Mode B: Two input signals are received by ports Port2 and Port3. The input signal received by port3 is input to phase shift unit Unit3. After the phase is changed by phase shift unit Unit3, it is input to transmission unit Unit1. The input signal received by port2 is directly input to transmission unit Unit1. The two input signals input to transmission unit Unit1 are filtered and then combined into one output signal and output from port Port1. Isolation unit Unit2 ensures that the two input signals do not interfere with each other.

2. The unequal-phase dual-path filter circuit according to claim 1, characterized in that, The transmission unit Unit1 includes a capacitor. C 1. Capacitor C 2. Capacitor C 3. Inductance L 1. Inductor L’ 1. Inductor L 2. Inductance L’ 2; Inductance L’ One end serves as the first end of transmission unit Unit1, and the inductor... L’ 1. A capacitor is connected to the other end. C 1. One end, inductor L’ 2. One end, capacitor C 3. One end; C 3. The other end is grounded; inductor L’ 2. The other end serves as the second end of transmission unit Unit 1; capacitor C The other end of 1 is also connected to a capacitor. C 2. One end, inductor L 2. One end, inductor L 1. One end; capacitor C The other end of 2 is grounded, inductor L The other end of 1 is grounded; inductor L 2. The other end serves as the third end of the transmission unit Unit1; the inductor L 1、 inductance L’ 1 is configured such that inductive coupling exists between them; the inductor L 2、 inductance L’ 2 are configured such that inductive coupling exists between them; the inductor L 1. Inductor L’ 1. Inductor L 2. Inductance L’ Both are implemented using metallized transmission lines, and their projections on the plane of the lower metal plate are composed of a combination of straight lines and arcs; the capacitor C 1. Capacitor C 2. Capacitor C All three are composed of two opposing rectangular metallized electrodes coupled together.

3. The unequal-phase dual-path filter circuit according to claim 2, characterized in that, The transmission unit Unit1 further includes a ground pad 1 and a ground pad 2 made of metallized material, with ground pad 1 and ground pad 2 respectively connected to the lower metal plate through metallized through holes; inductor L 1 is connected to ground Pad1, and capacitors C2 and C3 are connected to ground Pad2.

4. The unequal-phase dual-path filter circuit according to claim 1, characterized in that, The isolation unit Unit2 includes capacitors. C 4. Capacitor C 5. Capacitors C 6. Inductor L 3. Inductance L’ 3. Inductance L 4. Inductance L’ 4. Resistance R 1; Inductance L’ 3 One end serves as the first end of the isolation unit Unit2, inductor L’ 3. Connect capacitors to the other end. C 4. One end, inductor L’ 4. One end, capacitor C 6. One end; capacitor C The other end of 6 is grounded; capacitor C The other end of 4 is also connected to a capacitor. C 5. One end, inductor L 3. One end, inductor L 4. One end; capacitor C The other end of 5 is grounded; inductor L 3. The other end serves as the second end of the isolation unit Unit2; inductor L 4. The other end is connected to the inductor L’ 4. The other end is connected to a common resistor. R 1. One end, resistor R The other end of 1 is grounded; the inductor L 3、 inductance L’ 3 are configured such that inductive coupling exists between them; the inductor L 4、 inductance L’ 4 are configured such that inductive coupling exists between them; inductance L 3. Inductance L’ 3. Inductance L 4. Inductance L’ All four are implemented using metallized transmission lines, whose projections on the plane of the lower metal plate are composed of a combination of straight lines and arcs; capacitors C 4. Capacitor C 5. Capacitors C Each of the six is ​​composed of two opposing rectangular metallized electrodes coupled together.

5. The unequal-phase dual-path filter circuit according to claim 4, characterized in that, By adjusting the inductor L 3 and inductance L’ 3. Length and spacing, inductance L 4 and inductance L’ 4. Length and spacing, resistance R The size of 1, and the capacitance C 4. Capacitor C 5. Capacitors C The size of 6 achieves the desired isolation effect within the passband, meeting preset requirements.

6. The unequal-phase dual-path filter circuit according to claim 4, characterized in that, The isolation unit Unit 2 also includes a grounding pad 3 made of metallized material, which is connected to the lower metal plate through a metallized through-hole; capacitor C 5. Capacitors C 6. Resistance R 1 is connected to the ground Pad3.

7. The unequal-phase dual-path filter circuit according to claim 1, characterized in that, The phase-shifting unit Unit3 includes a capacitor. C 7. Capacitors C 8. Capacitors C 9. Inductor L 5. Inductance L’ 5. Inductance L 6; Inductance L 5. One end serves as the first terminal of the phase-shifting unit Unit3, and the inductor... L 5. A capacitor is connected to the other end at the same time. C 7. One end, capacitor C 8 One end, inductor L 6. One end; capacitor C The other end of 8 is grounded; inductor L The other end of 6 is grounded; capacitor C 7. A capacitor is connected to the other end at the same time. C 9. One end, inductor L’ 5. One end; capacitor C The other end of 9 is grounded; inductor L’ 5. The other end serves as the second end of the phase-shifting unit Unit 3; the inductor L 5. Inductance L’ 5 are configured such that there is inductive coupling between them; inductance L 5. Inductance L’ 5. Inductance L All 6 are implemented using metallized transmission lines, and their projections on the plane of the lower metal plate are composed of a combination of straight lines and arcs; capacitors C 7. Capacitors C 8. Capacitors C Each of the nine is composed of two opposing rectangular metallized electrodes coupled together.

8. The unequal-phase dual-path filter circuit according to claim 7, characterized in that, Phase shifting unit Unit3 adjusts the inductor L 5 and inductance L’ 5. Length and spacing, inductance L 6 length and capacitance C 7. Capacitors C 8. Capacitors C The size of 9 allows the first signal and the second signal to meet the preset phase difference requirements.

9. The unequal-phase dual-path filter circuit according to claim 7, characterized in that, The phase-shifting unit Unit3 also includes a grounding pad4 made of metallized material, which is connected to the lower metal plate through a metallized through-hole; inductor L 6. Capacitors C 8. Capacitors C 9 is connected to the ground Pad4.

10. An electronic device, characterized in that: The non-equal phase dual-path filter circuit includes any one of claims 1-9.

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