Miniaturized dielectric filters for 5G communications

Abstract

The present invention relates to a miniaturized dielectric filter for 5G communication, comprising: a dielectric substrate, a signal input port and a signal output port are arranged on the upper surface of the dielectric substrate, the first to eighth resonators are arranged in sequence between the signal input port and the signal output port, a first fly rod is arranged on one side of the first to fourth resonators to form a first CQ structure, a second fly rod is arranged on one side of the fifth to eighth resonators to form a second CQ structure, and a balance fly rod is arranged on one side of the first CQ structure and the second CQ structure. A row of parallel coaxial resonators is arranged on the dielectric substrate, coupling between the resonators is achieved through a coupling structure, two CQ structures are formed through the first fly rod and the second fly rod, and by adjusting the length and position of the balance fly rod, the left zero point position and strength of the filter can be accurately controlled to achieve controllable symmetry of the zero point, meet the high suppression requirements of the filter, and further reduce the volume of the filter.

Description

Technical Field

[0001] The present invention relates to the field of filter technology, and in particular to a miniaturized dielectric filter for 5G communication. Background Art

[0002] With the rapid development of 5G communication technology, the volume requirements for filters are getting higher and higher. Dielectric filters are widely used due to their obvious advantages in performance and volume. The single-block dielectric filter has a smaller volume due to its unique structure, and its topology is more flexible. However, the control of the zero point in the single-block dielectric filter has always been a difficult point in the industry. Usually, miniaturization requires sacrificing the performance of the filter. With the increasing requirements of communication technology for the suppression of filter sidebands, the ability to control the zero point while achieving miniaturization has become the optimization direction of dielectric filters. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a miniaturized dielectric filter for 5G communication, which has the advantages of small size, zero-point controllable symmetry and good suppression performance.

[0004] To achieve the above object, the technical solution of the present invention is as follows:

[0005] A miniaturized dielectric filter for 5G communication, comprising: a dielectric substrate, wherein a signal input port and a signal output port are provided on the upper surface of the dielectric substrate, and a first resonator, a second resonator, a third resonator, a fourth resonator, a fifth resonator, a sixth resonator, a seventh resonator and an eighth resonator are sequentially arranged between the signal input port and the signal output port, capacitive coupling is adopted between the first resonator and the second resonator, between the third resonator and the fourth resonator, between the fifth resonator and the sixth resonator, and between the seventh resonator and the eighth resonator, inductive coupling is adopted between the second resonator and the third resonator, between the fourth resonator and the fifth resonator, and between the sixth resonator and the seventh resonator, a first flying rod is provided on one side of the first resonator, the second resonator, the third resonator and the fourth resonator to form a first CQ structure, a second flying rod is provided on one side of the fifth resonator, the sixth resonator, the seventh resonator and the eighth resonator to form a second CQ structure, and a balancing flying rod is provided on the side of the first CQ structure and the second CQ structure opposite to the first flying rod and the second flying rod.

[0006] As a preferred solution of the present invention, a metal shielding layer is provided on the surroundings and lower surface of the dielectric substrate.

[0007] As a preferred embodiment of the present invention, the first resonator, the second resonator, the third resonator, the fourth resonator, the fifth resonator, the sixth resonator, the seventh resonator and the eighth resonator are formed by coaxial through holes opened in parallel metal sheets.

[0008] As a preferred solution of the present invention, a connection area corresponding to the signal input port and the signal output port is opened on the metal shielding layer, and the signal input port and the signal output port extend to the connection area.

[0009] As a preferred solution of the present invention, a first grounding rod connected to the metal shielding layer is provided between the second resonator and the third resonator, a second grounding rod connected to the metal shielding layer is provided between the fourth resonator and the fifth resonator, and a third grounding rod connected to the metal shielding layer is provided between the sixth resonator and the seventh resonator.

[0010] As a preferred solution of the present invention, the dielectric substrate is made of dielectric ceramic material.

[0011] In summary, the present invention has the following beneficial effects:

[0012] The present invention provides a miniaturized dielectric filter for 5G communication, arranges a row of parallel coaxial resonators on a dielectric substrate, realizes coupling between the resonators through a coupling structure, forms two CQ structures through a first flying rod and a second flying rod, and simultaneously, by adjusting the length and position of the balancing flying rod, the left zero point position and strength of the filter can be accurately controlled to achieve controllable symmetry of the zero point, meet the high suppression requirements of the filter, and further reduce the volume of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0015] Figure 2 FIG. 4 is a top view of an embodiment of the present invention.

[0016] Figure 3 This is the topological structure implemented in the embodiment of the present invention.

[0017] Figure 4 FIG. 4 is a frequency characteristic curve diagram of an embodiment of the present invention.

[0018] Figure 5 This is a frequency characteristic curve diagram after removing the balancing flying rod in the embodiment of the present invention.

[0019] The numbers and letters in the figure represent the corresponding component names:

[0020] 1. The first resonator; 2. The second resonator; 3. The third resonator; 4. The fourth resonator; 5. The fifth resonator; 6. The sixth resonator; 7. The seventh resonator; 8. The eighth resonator; 9. The first flying rod; 10. The second flying rod; 11. The first grounding rod; 12. The third grounding rod; 13. The signal input port; 14. The signal output port; 15. The balancing flying rod; 16. The metal shielding layer; 17. The second grounding rod. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example

[0023] A miniaturized dielectric filter for 5G communications, such as Figures 1 to 5 As shown, it includes: a dielectric substrate, a signal input port 13 and a signal output port 14 are provided on the upper surface of the dielectric substrate, a first resonator 1, a second resonator 2, a third resonator 3, a fourth resonator 4, a fifth resonator 5, a sixth resonator 6, a seventh resonator 7 and an eighth resonator 8 are arranged in sequence between the signal input port 13 and the signal output port 14, and the first resonator 1, the second resonator 2, the third resonator 3, the fourth resonator 4, the fifth resonator 5, the sixth resonator 6, the seventh resonator 7 and the eighth resonator 8 are formed by coaxial through holes opened on parallel metal sheets, thereby forming a row of coaxial resonators.

[0024] Capacitive coupling is adopted between the first resonator 1 and the second resonator 2, between the third resonator 3 and the fourth resonator 4, between the fifth resonator 5 and the sixth resonator 6, and between the seventh resonator 7 and the eighth resonator 8. The capacitive coupling is realized in a manner similar to a flat plate capacitor. Inductive coupling is adopted between the second resonator 2 and the third resonator 3, between the fourth resonator 4 and the fifth resonator 5, and between the sixth resonator 6 and the seventh resonator 7. A first grounding rod 11 connected to the metal shielding layer 16 is provided between the second resonator 2 and the third resonator 3, a second grounding rod 17 connected to the metal shielding layer 16 is provided between the fourth resonator 4 and the fifth resonator 5, and a third grounding rod 12 connected to the metal shielding layer 16 is provided between the sixth resonator 6 and the seventh resonator 7. When grounding is performed through the first grounding rod 11, the second grounding rod 17, and the third grounding rod 12, the coupling polarity is reversed to realize inductive coupling.

[0025] A first flying rod 9 is provided on one side of the first resonator 1, the second resonator 2, the third resonator 3 and the fourth resonator 4 to form a first CQ structure, a second flying rod 10 is provided on one side of the fifth resonator 5, the sixth resonator 6, the seventh resonator 7 and the eighth resonator 8 to form a second CQ structure, and a balancing flying rod 15 is provided on the side of the first CQ structure and the second CQ structure opposite to the first flying rod 9 and the second flying rod 10.

[0026] Furthermore, a metal shielding layer 16 is provided around and on the lower surface of the dielectric substrate. A connection area corresponding to the signal input port 13 and the signal output port 14 is opened on the metal shielding layer 16. The signal input port 13 and the signal output port 14 extend to the connection area. In this embodiment, the dielectric substrate is made of dielectric ceramic material.

[0027] The present invention arranges a row of parallel coaxial resonators on a dielectric substrate, realizes coupling between the resonators through a coupling structure, forms two CQ structures through a first flying rod 9 and a second flying rod 10, and simultaneously, by adjusting the length and position of a balancing flying rod 15, can accurately control the position and strength of the left zero point of the filter, realize controllable symmetry of the zero point, meet the high suppression requirement of the filter, and can further reduce the volume of the filter.

[0028] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A miniaturized dielectric filter for 5G communication, characterized in that: include: A dielectric substrate, wherein a signal input port and a signal output port are provided on the upper surface of the dielectric substrate, and a first resonator, a second resonator, a third resonator, a fourth resonator, a fifth resonator, a sixth resonator, a seventh resonator and an eighth resonator are sequentially arranged between the signal input port and the signal output port, capacitive coupling is adopted between the first resonator and the second resonator, between the third resonator and the fourth resonator, between the fifth resonator and the sixth resonator, and between the seventh resonator and the eighth resonator, inductive coupling is adopted between the second resonator and the third resonator, between the fourth resonator and the fifth resonator, and between the sixth resonator and the seventh resonator, a first flying rod is arranged on one side of the first resonator, the second resonator, the third resonator and the fourth resonator to form a first CQ structure, a second flying rod is arranged on one side of the fifth resonator, the sixth resonator, the seventh resonator and the eighth resonator to form a second CQ structure, and a balancing flying rod is arranged on one side of the first CQ structure and the second CQ structure opposite to the first flying rod and the second flying rod; Wherein, a metal shielding layer is provided on the surrounding and lower surface of the dielectric substrate; A first grounding rod connected to the metal shielding layer is provided between the second resonator and the third resonator, a second grounding rod connected to the metal shielding layer is provided between the fourth resonator and the fifth resonator, and a third grounding rod connected to the metal shielding layer is provided between the sixth resonator and the seventh resonator; The metal shielding layer is provided with a connection area corresponding to the signal input port and the signal output port, and the signal input port and the signal output port extend to the connection area; The dielectric substrate is made of dielectric ceramic material.

2. The miniaturized dielectric filter for 5G communication according to claim 1, characterized in that: The first resonator, the second resonator, the third resonator, the fourth resonator, the fifth resonator, the sixth resonator, the seventh resonator and the eighth resonator are formed by coaxial through holes opened in parallel metal sheets.

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