A dual-path filter circuit with band-pass response and communication and sensing device thereof

Abstract

The application provides a dual-path filter circuit with a band-pass response and a communication and sensing device thereof, which comprises resistors R1 and R2, and two groups of Unit 1, two groups of Unit 2 and two groups of Unit 3 with the same structure. The first signal transmission port of the first group of Unit 1 is connected with the first signal transmission port of the second group of Unit 1, and the node constitutes a collection port of the dual-path filter circuit. The two groups of Unit 1 are connected with the two groups of Unit 2 through the resistor R1, the two groups of Unit 2 are connected with the two groups of Unit 3 through the resistor R2. The second signal transmission port of the first group of Unit 3 and the second signal transmission port of the second group of Unit 3 constitute a branch port of the dual-path filter circuit. The dual-path filter circuit provided by the application uses a specific circuit instead of a quarter wavelength of a traditional Wilkinson device, so that the device has the functions of filtering and power distribution at the same time. The filter circuit realizes a filter power divider with the characteristics of isolation and wideband.

Description

Technical Field

[0001] This invention relates to a filter circuit, and more particularly to a dual-channel filter circuit with bandpass response and its communication and sensing device. Background Technology

[0002] Microwave passive devices are crucial components in microwave communication and radar systems, and their performance and size significantly impact transceiver systems. Power dividers, as a type of microwave passive device that simultaneously performs filtering and power distribution functions, have attracted widespread attention in the industry due to their miniaturization, low cost, and low insertion loss. High isolation between ports, high frequency selectivity, wide stopband rejection range, and small size are all goals pursued in the design of power dividers.

[0003] Therefore, it is necessary to improve the circuit structure of existing filter power dividers to solve the aforementioned defects in the existing technology. Summary of the Invention

[0004] This invention provides a filtering circuit, including resistors R1 and R2, and two sets of Unit 1, Unit 2, and Unit 3 with identical structures. The first signal transmission port of the first Unit 1 and the first signal transmission port of the second Unit 1 are connected, forming a junction port for the dual-path filtering circuit. The second signal transmission ports of the first Unit 1 and the first signal transmission ports of the first Unit 2 are connected to one end of resistor R1, and the other end of resistor R1 is connected to the first signal transmission ports of the second Unit 1 and the second Unit 2. The second signal transmission ports of the first Unit 2 and the first Unit 3 are connected to one end of resistor R2, and the other end of resistor R2 is connected to the second signal transmission ports of the second Unit 2 and the first signal transmission ports of the second Unit 3. The second signal transmission ports of the first Unit 3 and the second signal transmission ports of the second Unit 3 form the junction ports of the dual-path filtering circuit. The filtering function of the dual-path filtering circuit is controlled by adjusting the values ​​of each circuit element in Unit 1, Unit 2, and Unit 3, based on resistor R1. The isolation function of the dual-channel filter circuit is controlled by adjusting the value of component R2.

[0005] In one embodiment, Unit 1 includes capacitors C1, C2, and C3, and inductors L1 and L2. One end of inductor L1 forms the first signal transmission port of Unit 1, and the other end of inductor L1 is connected to one end of capacitor C1 and one end of capacitor C2. The other end of capacitor C1 is grounded. The other end of capacitor C2 is connected to one end of capacitor C3 and one end of inductor L2. The other end of capacitor C3 is grounded. The other end of inductor L2 forms the second signal transmission port of Unit 1.

[0006] In one embodiment, Unit 2 includes capacitor C4, capacitor C5, inductor L3, and inductor L3'; one end of capacitor C5 is connected to one end of inductor L3, and this node constitutes the first signal transmission port of Unit 2; the other end of inductor L3 is connected to one end of inductor L3' and one end of capacitor C4, and the other end of capacitor C4 is grounded; the other end of capacitor C5 is connected to the other end of inductor L3', and this node constitutes the second signal transmission port of Unit 2.

[0007] In one embodiment, Unit 3 includes capacitors C6, C7, and C8, and inductors L4 and L5. One end of inductor L4 forms the first signal transmission port of Unit 3, and the other end of inductor L4 is connected to one end of capacitor C6 and one end of capacitor C7. The other end of capacitor C6 is grounded. The other end of capacitor C7 is connected to one end of capacitor C8 and one end of inductor L5. The other end of capacitor C8 is grounded. The other end of inductor L5 forms the second signal transmission port of Unit 3.

[0008] In one embodiment, inductive coupling is provided between inductor L3 and inductor L3'.

[0009] In one embodiment, a communication device includes the dual-path filtering circuit described in claim 5.

[0010] In one embodiment, a sensing device includes the dual-path filtering circuit described in claim 5.

[0011] Based on the above scheme, the dual-channel filter circuit of this embodiment uses a specific circuit to replace a quarter wavelength of the traditional Wilkinson circuit, enabling the device to simultaneously possess filtering and power distribution functions. The filter power divider implemented with this topology has excellent isolation, broadband, and other characteristics.

[0012] To make the above features and advantages of the present invention more apparent and understandable, embodiments are described below in conjunction with the accompanying drawings for detailed explanation. Attached Figure Description

[0013] Figure 1 This is a circuit diagram of the filter circuit according to the present invention;

[0014] Figure 2 For the filter circuit according to the present invention S -Parameter simulation results diagram. Detailed Implementation

[0015] The following explanation is provided in conjunction with the accompanying drawings.

[0016] Figure 1 The circuit diagram of the filter circuit according to the present invention is shown below. Figure 1 As shown, an embodiment of the present invention proposes a dual-path filtering circuit with bandpass response and its communication and sensing device, including resistors R1 and R2, and two sets of Unit 1, two sets of Unit 2, and two sets of Unit 3 with the same structure; the first signal transmission port of the first set of Unit 1 and the first signal transmission port of the second set of Unit 1 are connected, and this node constitutes the collection port of the dual-path filtering circuit; the second signal transmission port of the first set of Unit 1 and the first signal transmission port of the first set of Unit 2 are connected to one end of resistor R1, and the other end of resistor R1 is connected to the first signal transmission port of the second set of Unit 1 and the first signal transmission port of the second set of Unit 2; the second signal transmission port of the first set of Unit 2 and the first signal transmission port of the first set of Unit 3 are connected to one end of resistor R2, and the other end of resistor R2 is connected to the second signal transmission port of the second set of Unit 2 and the first signal transmission port of the second set of Unit 3; the second signal transmission port of the first set of Unit 3 and the second signal transmission port of the second set of Unit 3 constitute the branch port of the dual-path filtering circuit; based on Unit 1, Unit 2, and Unit 3... Adjusting the values ​​of each circuit component in section 3 enables the filtering function control of the dual-channel filter circuit, while adjusting the values ​​of resistors R1 and R2 enables the isolation function control of the dual-channel filter circuit.

[0017] Unit 1 includes capacitors C1, C2, and C3, and inductors L1 and L2. One end of inductor L1 forms the first signal transmission port of Unit 1. The other end of inductor L1 is connected to one end of capacitor C1 and one end of capacitor C2. The other end of capacitor C1 is grounded. The other end of capacitor C2 is connected to one end of capacitor C3 and one end of inductor L2. The other end of capacitor C3 is grounded. The other end of inductor L2 forms the second signal transmission port of Unit 1.

[0018] Unit 2 includes capacitor C4, capacitor C5, inductor L3, and inductor L3'. One end of capacitor C5 is connected to one end of inductor L3, and this node constitutes the first signal transmission port of Unit 2. The other end of inductor L3 is connected to one end of inductor L3' and one end of capacitor C4. The other end of capacitor C4 is grounded. The other end of capacitor C5 is connected to the other end of inductor L3', and this node constitutes the second signal transmission port of Unit 2.

[0019] Unit 3 includes capacitors C6, C7, and C8, and inductors L4 and L5. One end of inductor L4 forms the first signal transmission port of Unit 3. The other end of inductor L4 is connected to one end of capacitor C6 and one end of capacitor C7. The other end of capacitor C6 is grounded. The other end of capacitor C7 is connected to one end of capacitor C8 and one end of inductor L5. The other end of capacitor C8 is grounded. The other end of inductor L5 forms the second signal transmission port of Unit 3.

[0020] Inductive coupling is established between inductor L3 and inductor L3'.

[0021] Optionally, a communication device may include the above dual-channel filtering circuit.

[0022] Optionally, a sensing device may include the above dual-channel filtering circuit.

[0023] Figure 2 The following is a simulation result diagram of the S-Parameter of the filter circuit according to the present invention, as shown in the figure. Figure 2 As shown, the simulation results show that the 20-dB return loss passband range is 4 GHz-6.5 GHz, the relative bandwidth is 48%, and the in-band isolation between port 2 and port 3 is less than 25 dB.

[0024] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A dual-channel filter circuit with bandpass response, characterized in that, This includes resistors R1 and R2, as well as two sets of Unit 1 with the same structure, two sets of Unit 2 with the same structure, and two sets of Unit 3 with the same structure; The first signal transmission port of Unit 1 in the first group and the first signal transmission port of Unit 2 in the second group are connected together, and the connection point forms the junction port of the dual-channel filter circuit. The second signal transmission port of Unit 1 in the first group and the first signal transmission port of Unit 2 in the first group are both connected to one end of resistor R1, and the other end of resistor R1 is connected to the second signal transmission port of Unit 1 in the second group and the first signal transmission port of Unit 2 in the second group. The second signal transmission port of Unit 2 in the first group and the first signal transmission port of Unit 3 in the first group are both connected to one end of resistor R2, and the other end of resistor R2 is connected to the second signal transmission port of Unit 2 in the second group and the first signal transmission port of Unit 3 in the second group. The second signal transmission port of Unit 3 in the first group and the second signal transmission port of Unit 3 in the second group constitute the branch port of the dual-channel filter circuit; the filtering function control of the dual-channel filter circuit is realized by adjusting the values ​​of each circuit element in Unit 1, Unit 2 and Unit 3, and the isolation function control of the dual-channel filter circuit is realized by adjusting the values ​​of resistors R1 and R2. Unit 1 includes capacitors C1, C2, and C3, and inductors L1 and L2. One end of inductor L1 forms the first signal transmission port of Unit 1, and the other end of inductor L1 is connected to one end of capacitor C1 and one end of capacitor C2. The other end of capacitor C1 is grounded. The other end of capacitor C2 is connected to one end of capacitor C3 and one end of inductor L2. The other end of capacitor C3 is grounded. The other end of inductor L2 forms the second signal transmission port of Unit 1. Unit 2 includes capacitors C4 and C5, inductor L3 and inductor L3'. One end of capacitor C5 is connected to one end of inductor L3, and the connection point constitutes the first signal transmission port of Unit 2. The other end of inductor L3 is connected to one end of inductor L3' and one end of capacitor C4, and the other end of capacitor C4 is grounded. The other end of capacitor C5 is connected to the other end of inductor L3', and the connection point constitutes the second signal transmission port of Unit 2. Unit 3 includes capacitors C6, C7, C8, inductor L4 and inductor L5. One end of inductor L4 constitutes the first signal transmission port of Unit 3. The other end of inductor L4 is connected to one end of capacitor C6 and one end of capacitor C7, and the other end of capacitor C6 is grounded. The other end of capacitor C7 is connected to one end of capacitor C8 and one end of inductor L5, and the other end of capacitor C8 is grounded. The other end of inductor L5 constitutes the second signal transmission port of Unit 3.

2. The dual-channel filter circuit with bandpass response according to claim 1, characterized in that, Inductive coupling is established between inductor L3 and inductor L3'.

3. A communication device, characterized in that, Includes the dual-path filtering circuit described in claim 2.

4. A sensing device, characterized in that, Includes the dual-path filtering circuit described in claim 2.

Images