A dual passband filter device with passband hetero-integration

Abstract

This invention discloses a heterogeneous dual-channel filter device with passband integration, belonging to the field of wireless communication technology. Its technical solution mainly includes: a main channel cavity structure composed of a first and a second diamond-shaped air cavity stacked vertically, with energy coupling between the two cavities via a cross-shaped slot; a set of input ports and a set of output ports respectively inserted into the two cavities; and two independent rectangular coupling cavities loaded with dielectric resonators, respectively coupled to the two main cavities. Through a specific port layout and coupling design, the first channel, composed of the first input port and the first and third output ports, achieves dual-passband filtering and power distribution functions, while the second channel, composed of the second input port and the second output port, achieves single-passband filtering functions. This invention achieves a high degree of integration of two heterogeneous filter devices by sharing the main cavity structure, reducing size and cost, and ensuring high isolation between the two channels through structural design.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, specifically to a passband heterogeneous integrated dual-channel filter device. Background Technology

[0002] With the deep integration and evolution of technologies such as 5G, IoT, and satellite communication, modern wireless communication systems are developing towards multi-mode, multi-frequency, and multi-functional integration. Terminal devices need to be compatible with multiple communication standards and frequency bands (such as Sub-6GHz and millimeter wave), which places extremely stringent requirements on the core filtering components in the RF front-end: not only do they need to achieve low-loss and high-selectivity filtering functions, but they also often need to have different filtering performances within a single module, such as supporting heterogeneous channel processing capabilities with different center frequencies, different bandwidths, and even different passband numbers. The traditional solution is to use multiple independent filters or filtering function modules cascaded or paralleled, but this undoubtedly leads to a large system size, accumulated insertion loss, high cost, and is not conducive to high integration. Although academia and industry have been committed to device fusion design to pursue miniaturization, such as the successful integration of filtering and power distribution functions in a filter power divider, most existing research focuses on the fusion of homogeneous passbands (such as devices with dual passbands). How to integrate and design filter devices with heterogeneous passband characteristics (such as single passband and dual passband) to achieve resource sharing, independent performance and compact structure remains a technical challenge that has not yet been fully solved. This has also become one of the key bottlenecks restricting the further miniaturization and high performance of RF front-ends. Summary of the Invention

[0003] The technical problem this invention aims to solve is to overcome the above-mentioned technical defects and provide a passband heterogeneous integrated dual-channel filter device. It integrates a single-passband cavity filter and a dual-passband cavity filter power divider into a single design, sharing the main channel cavity structure. This reduces the filter size and cost while achieving high isolation between the two filter devices.

[0004] To solve the above-mentioned technical problems, the technical solution provided by the present invention is: a passband heterogeneous integrated dual-channel filter device, comprising:

[0005] The main channel cavity structure is composed of a first diamond-shaped air cavity and a second diamond-shaped air cavity stacked together. The first diamond-shaped air cavity and the second diamond-shaped air cavity are energy coupled through a cross-shaped groove between them.

[0006] A set of input ports, including a first input port and a second input port that are inserted into the first diamond-shaped air cavity;

[0007] A set of output ports, including a first output port, a second output port, and a third output port that are inserted into the second diamond-shaped air cavity;

[0008] The first coupling cavity is a rectangular metal cavity loaded by the first dielectric resonator, which is coupled to the first diamond-shaped air cavity through the first rectangular coupling window;

[0009] The second coupling cavity is a rectangular metal cavity loaded by the second dielectric resonator, which is coupled to the second diamond-shaped air cavity through a second rectangular coupling window;

[0010] The first input port, the first output port, and the third output port constitute a first filtering channel, and the second input port and the second output port constitute a second filtering channel. The first filtering channel is a dual-passband power divider, and the second filtering channel is a single-passband filter.

[0011] Furthermore, the first and second diamond-shaped air cavities have the same shape, both formed by cutting off a pair of opposite corners of a rectangular air resonator to create a diamond shape.

[0012] Furthermore, the input port and output port constituting the first filtering channel are parallel to each other, the input port and output port constituting the second filtering channel are parallel to each other, and the input port and output port of the first filtering channel and the second filtering channel are perpendicular to each other.

[0013] Furthermore, for the two ports in the first diamond-shaped air cavity, the first input port is inserted along a sharp corner of the first diamond-shaped air cavity, and the second input port is inserted along the center position of the chamfered plane of the side wall of the first diamond-shaped air cavity.

[0014] Furthermore, for the three ports in the second diamond-shaped air cavity, the first output port and the third output port are inserted along the two sharp corners of the second diamond-shaped air cavity, respectively, and the second output port is inserted along the center position of the chamfered plane of the side wall of the second diamond-shaped air cavity.

[0015] Furthermore, the cross-shaped groove is formed by two rectangular grooves of the same length intersecting each other, wherein one rectangular groove independently controls the coupling coefficient of the first filtering channel, and the other rectangular groove independently controls the coupling coefficient of the second filtering channel.

[0016] Furthermore, the first input port couples energy with the first output port and the third output port through a rectangular slot in the cross-shaped groove that is perpendicular to both of them; the second input port couples energy with the second output port through another rectangular slot in the cross-shaped groove that is perpendicular to both of them.

[0017] Furthermore, the first dielectric resonator is disposed within the first coupling cavity, and the second dielectric resonator is disposed within the second coupling cavity;

[0018] Both the first dielectric resonator and the second dielectric resonator are cubic in shape.

[0019] The first dielectric resonator is disposed at the center of the side wall of the first coupling cavity, and one of its outer surfaces is in complete contact with the cavity side wall of the first coupling cavity.

[0020] The second dielectric resonator is disposed at the center of the side wall of the second coupling cavity, and one of its outer surfaces is in complete contact with the cavity side wall of the second coupling cavity.

[0021] Furthermore, both the input port and the output port include feeders;

[0022] For the input port, its feeder is fitted with a cylindrical air cavity in the portion extending into the first diamond-shaped air cavity;

[0023] For the output port, its feed line has a cylindrical air cavity surrounding the portion that extends into the second diamond-shaped air cavity;

[0024] This creates an air coaxial structure.

[0025] The advantages of this invention compared to the prior art are:

[0026] This invention successfully integrates a single-passband cavity filter and a dual-passband cavity filter power divider through innovative structural design. Its core advantage lies in the use of a shared main channel cavity structure. Through a unique diamond-shaped cavity and cross-shaped coupling slot design, the two filter channels can excite different operating modes within this shared cavity and achieve independent energy coupling paths, thus achieving a high degree of integration at the physical level. This integrated design concept fundamentally avoids the volume redundancy and connection losses caused by splicing multiple independent components in traditional solutions, significantly reducing the overall structural size and lowering manufacturing costs and weight. Simultaneously, by introducing independently adjustable dielectric resonators to load the coupling cavity, the filtering response of each channel is effectively shaped, resulting in excellent out-of-band rejection characteristics. The ports are carefully laid out, utilizing spatial orthogonality to greatly improve the isolation between the two heterogeneous filter channels, ensuring that they do not interfere with each other and operate independently. In summary, this invention achieves high-performance integration of heterogeneous paired passband filtering functions in a single compact physical structure, while maintaining excellent filtering performance and high isolation characteristics of each channel. It provides a high-performance, miniaturized, and low-cost heterogeneous filtering solution for the RF front-end of modern complex communication systems. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a passband heterogeneous integrated dual-channel filter device according to this application.

[0028] Figure 2 This is a partially enlarged schematic diagram of the second input port of this application.

[0029] Figure 3 This is a top view schematic diagram of a passband heterogeneous integrated dual-channel filter device according to this application.

[0030] Figure 4 This is a side view of a passband heterogeneous integrated dual-channel filter device according to this application.

[0031] Figure 5 This is an amplitude-frequency response curve diagram of an embodiment of this application.

[0032] Figure 6 This is a port isolation curve diagram of an embodiment of this application.

[0033] As shown in the figure: 1. First diamond-shaped air cavity, 2. Second diamond-shaped air cavity, 3. Cross-shaped groove, 4. First input port, 5. Second input port, 6. First output port, 7. Second output port, 8. Third output port, 9. First coupling cavity, 10. Second coupling cavity, 11. First dielectric resonator, 12. Second dielectric resonator, 13. Feed line, 14. Cylindrical air cavity, 15. First rectangular coupling window, 16. Second rectangular coupling window. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments described herein and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0035] Please see Figures 1 to 3 This invention provides a passband heterogeneous integrated dual-channel filter device. The device comprises a main channel cavity structure, a set of input ports, a set of output ports, and two independent coupling cavities.

[0036] The main channel cavity structure consists of a first diamond-shaped air cavity 1 and a second diamond-shaped air cavity 2, arranged in a stacked arrangement with identical shapes. Specifically, both the first diamond-shaped air cavity 1 and the second diamond-shaped air cavity 2 are formed by cutting off a pair of opposite corners of a rectangular air resonator cavity to create a diamond shape. These two diamond-shaped air cavities are not isolated; they are energy-coupled through a special cross-shaped slot 3, thus physically fusing into a shared cavity structure. The cross-shaped slot 3 is formed by two rectangular slots of the same length intersecting perpendicularly. Its key function is that each rectangular slot can independently control the coupling coefficient of a filter channel, which lays the foundation for subsequently realizing the heterogeneous performance (single passband and dual passband) of the two channels.

[0037] The port configuration is crucial in distinguishing the two channels. A set of input ports (i.e., first input port 4 and second input port 5) are inserted into the first diamond-shaped air cavity 1. A set of output ports (i.e., first output port 6, second output port 7, and third output port 8) are inserted into the second diamond-shaped air cavity 2. The spatial orientation of these ports is carefully designed to ensure isolation between the channels. Figure 2 As shown, the input and output ports constituting the same filtering channel are parallel to each other. Specifically, the first input port 4, the first output port 6, and the third output port 8 are parallel to each other, forming the first filtering channel; the second input port 5 and the second output port 7 are parallel to each other, forming the second filtering channel. The ports of the first and second filtering channels are perpendicular to each other; this orthogonal layout effectively reduces crosstalk between channels. Regarding the port insertion position, for the first diamond-shaped air cavity 1, its first input port 4 is inserted along one of the sharp corners of the cavity, while the second input port 5 is inserted along the center of the chamfered plane of the cavity's side wall. For the second diamond-shaped cavity 2, its first output port 6 and third output port 8 are inserted along the two sharp corners of the cavity, while the second output port 7 is inserted along the center of the chamfered plane of its side wall. This differentiated feed position affects the coupling strength between the ports and different modes within the cavity.

[0038] The energy coupling mechanism of the cross-shaped slot 3 is specifically manifested as follows: the first input port 4 is coupled to the first output port 6 and the third output port 8 through the rectangular slot in the cross-shaped slot 3 that is perpendicular to the direction of both ports; similarly, the second input port 5 and the second output port 7 are coupled through another rectangular slot in the cross-shaped slot 3 that is perpendicular to the direction of both ports. This achieves the independence of the coupling paths of the two channels.

[0039] To further shape the filter response, this invention introduces two independent coupling cavities. The first coupling cavity 9 is a rectangular metal cavity loaded with a first dielectric resonator 11, which is coupled to the first diamond-shaped air cavity 1 through a first rectangular coupling window 15. The second coupling cavity 10 is a rectangular metal cavity loaded with a second dielectric resonator 12, which is coupled to the second diamond-shaped air cavity 2 through a second rectangular coupling window 16. Both the first dielectric resonator 11 and the second dielectric resonator 12 are cubic, respectively positioned at the center of the sidewall of their respective coupling cavities, with one outer surface in complete contact with the cavity sidewall. This dielectric resonator loading structure is primarily used to generate transmission zeros to improve the out-of-band rejection characteristics of the filter. The two coupling cavities operate independently and do not affect each other.

[0040] Furthermore, for ease of matching, a small cylindrical air cavity 14 is fitted around the portion of the feed line 13 at each port that extends into the diamond-shaped air cavity, thus forming an air coaxial structure. By adjusting the inner diameter and depth of this cylindrical air cavity, the external quality factor of the port can be flexibly adjusted to optimize matching.

[0041] To make the structure of this embodiment clearer, a specific dimensional design example is provided below, with parameters shown in Table 1. It should be noted that these dimensions are not limitations on the invention, and those skilled in the art can adjust them as needed.

[0042] Table 1. Dimensional parameters of this embodiment

[0043]

[0044] Note: g1 is the feed line length of the first input port (or the first output port); g2 is the feed line length of the second input port (or the second output port);

[0045] d1 and d2 are the length and width of the rectangular groove in the cross-shaped groove, respectively;

[0046] d3 is the height of the cross-shaped groove;

[0047] l1 is the length of the first diamond-shaped air cavity (or the second diamond-shaped air cavity) along its transverse direction;

[0048] l2 is the width of the first diamond-shaped air cavity (or the second diamond-shaped air cavity) along its longitudinal direction;

[0049] l3 is the height of the first diamond-shaped air cavity (or the second diamond-shaped air cavity);

[0050] c1 is the length of the first coupling cavity (or the second coupling cavity);

[0051] c2 is the width of the first coupling cavity (or the second coupling cavity);

[0052] t1 is the length of the first dielectric resonator (or the second dielectric resonator);

[0053] t2 is the width of the first dielectric resonator (or the second dielectric resonator);

[0054] t3 is the height of the first dielectric resonator (or the second dielectric resonator);

[0055] s1 is the length of the first rectangular coupling window (or the second rectangular coupling window);

[0056] s2 is the width of the first rectangular coupling window (or the second rectangular coupling window).

[0057] The simulation results based on the above structure and parameters are as follows: Figure 5 and Figure 6 As shown.

[0058] Figure 5 The simulated amplitude-frequency response curves of the passband heterogeneous integrated dual-channel filter device are shown, intuitively presenting the frequency domain characteristics of the two heterogeneous filter channels.

[0059] First filter channel (dual passband filter power divider characteristics): composed of S 11 (Return loss at the first input port), S 21 (Insertion loss at the first output port) and S 51 (Third output port insertion loss) curve representation. This channel successfully achieved a dual-passband response, with center frequencies of 7.7 GHz and 8.2 GHz for the two passbands, respectively. Within both passbands, the input return loss (S... 11 All are better than 12 dB, and the output insertion loss (S) is better than 12 dB. 21 , S 51 All values ​​are better than 3.3 dB (including the 3 dB power distribution loss inherent in the power divider). This validates the design of this channel that integrates filtering and power distribution functions.

[0060] Second filtering channel (single passband filter characteristics): composed of S 33 (Second input port return loss) and S 43 (Insertion loss at the second output port) is represented by a curve. This channel exhibits a standard single-passband filter response with a passband center frequency of 7.7 GHz. At this frequency, the input return loss (S... 33 The passband insertion loss is better than 21 dB, and the passband insertion loss is better than 21 dB. 43 The filter impedance is less than 0.2 dB, demonstrating excellent filtering performance.

[0061] Figure 6 The simulation curves of the isolation between the ports of this device are shown. In the figure, curve S... 31This reflects the isolation between the first input port and the second input port, i.e., the signal isolation between the two input channels; curve S 41 This reflects the isolation between the first input port and the second output port, and characterizes the ability of the first channel input to suppress the second channel output; curve S 32 This reflects the isolation between the second input port and the first output port, i.e., the ability of the second channel input to suppress the first channel output; curve S 35 This reflects the isolation between the second input port and the third output port, and is the suppression of the other output of the first channel by the second channel input; curve S 42 and S 45 These figures reflect the isolation between the first and second output ports, and between the second and third output ports, respectively, demonstrating the mutual isolation between the two channel outputs. As shown in the figure, the isolation between all the aforementioned key ports is greater than 26dB within the passband of their respective channels. This excellent isolation performance proves that the present invention, through its diamond-shaped cavity, orthogonal port layout, and independent cross-shaped coupling slot design, can effectively achieve energy decoupling between channels, ensuring that the two heterogeneous filter channels have good independence and stability during operation.

[0062] In summary, this embodiment integrates a diamond-shaped air cavity, a cross-shaped coupling slot, a dielectric resonator loading cavity, and ports with specific spatial orientations into a single compact structure, achieving heterogeneous integration of the passband and ensuring high isolation between channels.

[0063] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A passband heterogeneously integrated dual-channel filter device, characterized in that, include: The main channel cavity structure is composed of a first diamond-shaped air cavity (1) and a second diamond-shaped air cavity (2) stacked together. The first diamond-shaped air cavity (1) and the second diamond-shaped air cavity (2) are energy coupled through a cross-shaped groove (3) between them. A set of input ports, including a first input port (4) and a second input port (5) inserted into the first diamond-shaped air cavity (1); A set of output ports, including a first output port (6), a second output port (7) and a third output port (8) inserted into the second diamond-shaped air cavity (2); The first coupling cavity (9) is a rectangular metal cavity loaded by the first dielectric resonator (11), and is coupled to the first diamond-shaped air cavity (1) through the first rectangular coupling window (15); The second coupling cavity (10) is a rectangular metal cavity loaded by the second dielectric resonator (12), which is coupled to the second diamond-shaped air cavity (2) through the second rectangular coupling window (16); The first input port (4), the first output port (6) and the third output port (8) constitute the first filtering channel, and the second input port (5) and the second output port (7) constitute the second filtering channel.

2. The passband heterogeneous integrated dual-channel filter device according to claim 1, characterized in that, The first diamond-shaped air cavity (1) and the second diamond-shaped air cavity (2) have the same shape, both formed by cutting off a pair of opposite corners of a rectangular air resonator cavity to form a diamond shape.

3. The passband heterogeneous integrated dual-channel filter device according to claim 2, characterized in that, The input and output ports of the first filter channel are parallel to each other, the input and output ports of the second filter channel are parallel to each other, and the input and output ports of the first and second filter channels are perpendicular to each other.

4. The passband heterogeneous integrated dual-channel filter device according to claim 3, characterized in that, For the two ports in the first diamond-shaped air cavity (1), the first input port (4) is inserted along one of the sharp corners of the first diamond-shaped air cavity (1), and the second input port (5) is inserted along the center position of the chamfered plane of the side wall of the first diamond-shaped air cavity (1).

5. The passband heterogeneous integrated dual-channel filter device according to claim 3, characterized in that, For the three ports in the second diamond-shaped air cavity (2), the first output port (6) and the third output port (8) are inserted along the two sharp corners of the second diamond-shaped air cavity (2), and the second output port (7) is inserted along the center position of the side wall chamfer plane of the second diamond-shaped air cavity (2).

6. The passband heterogeneous integrated dual-channel filter device according to claim 1, characterized in that, The cross-shaped groove (3) is formed by two rectangular grooves of the same length crossing each other. One rectangular groove independently controls the coupling coefficient of the first filter channel, and the other rectangular groove independently controls the coupling coefficient of the second filter channel.

7. The passband heterogeneous integrated dual-channel filter device according to claim 6, characterized in that, The first input port (4) couples energy with the first output port (6) and the third output port (8) through a rectangular slot in the cross-shaped slot (3) that is perpendicular to both of them; the second input port (5) couples energy with the second output port (7) through another rectangular slot in the cross-shaped slot (3) that is perpendicular to both of them.

8. The passband heterogeneous integrated dual-channel filter device according to claim 1, characterized in that, The first dielectric resonator (11) is disposed in the first coupling cavity (9), and the second dielectric resonator (12) is disposed in the second coupling cavity (10); The first dielectric resonator (11) and the second dielectric resonator (12) are both cubic in shape; The first dielectric resonator (11) is located at the center of the side wall of the first coupling cavity (9), and one of its outer surfaces is in complete contact with the cavity side wall of the first coupling cavity (9); The second dielectric resonator (12) is located at the center of the side wall of the second coupling cavity (10), and one of its outer surfaces is in complete contact with the cavity side wall of the second coupling cavity (10).

9. The passband heterogeneous integrated dual-channel filter device according to any one of claims 1-8, characterized in that, Both the input port and the output port include a feeder (13); For the input port, its feed line (13) is fitted with a cylindrical air cavity (14) in the part that extends into the first diamond-shaped air cavity (1). For the output port, its feed line (13) is fitted with a cylindrical air cavity (14) in the part that extends into the second diamond-shaped air cavity (2). This creates an air coaxial structure.

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