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CN-121983766-A - Be applied to miniaturized broadband merit of X frequency channel and divide wave filter

CN121983766ACN 121983766 ACN121983766 ACN 121983766ACN-121983766-A

Abstract

The invention relates to a miniaturized broadband power division filter applied to an X frequency band. The metal layer is divided into two layers, including an upper metal layer and a lower metal layer; the upper metal layer comprises a section of input feeder line, a first output feeder line, a second output feeder line, an isolation resistor, a first filtering branch knot and a second filtering branch knot, wherein the first filtering branch knot and the second filtering branch knot respectively comprise two identical dual composite left-right hand resonance units, the lower metal layer is of a metal grounding plate structure, and two grooves are formed in the metal grounding plate. The invention fully utilizes the characteristic of sub-wavelength, realizes the miniaturization of the circuit, effectively overcomes the defect of oversized size of the traditional cascading scheme, and is suitable for high-frequency (x-band) application scenes. The whole structure is based on the double-sided microwave dielectric plate, has the advantages of simple and convenient processing and low cost, and is suitable for mass production.

Inventors

  • WANG WEIXI
  • DU CHANGYUAN

Assignees

  • 扬州江嘉科技有限公司

Dates

Publication Date
20260505
Application Date
20251128

Claims (5)

  1. 1. The miniaturized broadband power division filter applied to the X frequency band is characterized by comprising a metal layer and a dielectric substrate layer (8), wherein the metal layer is divided into two layers, and comprises an upper metal layer and a lower metal layer (9); The upper metal layer comprises a section of input feeder line (1), a first output feeder line (2), a second output feeder line (3), an isolation resistor (6), a first filtering branch and a second filtering branch, wherein the first filtering branch and the second filtering branch respectively comprise two identical dual composite left-right-hand resonance units (4); The lower metal layer (9) is of a metal grounding plate structure, and two grooves are formed in the metal grounding plate; The four identical dual composite left-right-hand resonators (4) are dual composite left-right-hand resonators, and each resonator comprises a pair of toe-crossing capacitors (5) and a section of transmission line inductor (7), and two ends of the transmission line inductor (7) are connected with two ends of the toe-crossing capacitors (5); four dual composite left and right hand resonance units (4) are arranged in a2 multiplied by 2 matrix form, the left two resonance units (4) are respectively and directly connected with two branches of an input feeder (1) and are connected with an isolation resistor (6) in a bridging manner, and the right two resonance units (4) are respectively and directly connected with a first output feeder (2) and a second output feeder (3).
  2. 2. The miniaturized broadband power division filter for the X frequency band of claim 1, wherein the upper metal layer is made of copper with the thickness of 0.035mm, the dielectric substrate layer (8) is made of Rogers5880, the dielectric constant is 2.2, the thickness is 0.787mm, and the loss tangent is 0.0009.
  3. 3. The miniaturized broadband power division filter for the X frequency band according to claim 1, wherein the line width and the line length of the toe-crossing capacitor (5) are both larger than 0.125mm, the gap between the toe-crossing capacitors (5) is larger than 0.125mm, the line width and the line length of the transmission line inductor (7) are both larger than 0.125mm, the line width of the branch joint connecting the transmission line inductor (7) and the toe-crossing capacitor (5) is larger than 0.125mm, and the line length is larger than 0.125mm.
  4. 4. A miniaturized broadband power division filter applied to an X frequency band according to claim 1 is characterized in that the first output feeder line (2) and the second output feeder line (3) are symmetrical with respect to a central axis of a dielectric substrate layer (8), and two identical dual-composite left-right-hand resonance units (4) of the first filtering branch and two identical dual-composite left-right-hand resonance units (4) of the second filtering branch are respectively symmetrical with respect to the central axis of the dielectric substrate layer (8).
  5. 5. The miniaturized broadband power division filter applied to the X frequency band of claim 1, wherein the upper metal layer, the dielectric substrate layer (8) and the lower metal layer (9) are of a laminated structure from top to bottom.

Description

Be applied to miniaturized broadband merit of X frequency channel and divide wave filter Technical Field The invention relates to the technical field of wireless communication, in particular to a miniaturized broadband power division filter applied to an X frequency band. Background In order to meet the requirements of modern combat platforms such as missile-borne and airborne on high performance, miniaturization and light weight of a radio frequency front-end system, the filtering power divider is used as a key component for realizing signal distribution and frequency selection functions, and the performance quality of the filtering power divider directly influences the overall performance of the system. However, in the application of high frequency bands such as x-band, the conventional design scheme generally faces the problems of oversized size, limited bandwidth, insufficient port isolation and the like, and ideal performance integration is difficult to realize in a limited space. In the prior art, the scheme for realizing the integration of the filtering and the power division mainly comprises two types, namely a mode of directly cascading a filter and a power divider is adopted, the mode leads to larger circuit structure size and is difficult to adapt to the development trend of miniaturization of a system, and the filtering structure is fused into the design of the power divider, for example, a filtering circuit is used for replacing a quarter-wavelength impedance converter in a Wilkinson power divider, and the mode reduces the size to a certain extent, but the whole structure still has the potential of further optimization. Therefore, how to further push the filter power divider to develop to smaller size and higher integration on the premise of maintaining good performance is still a technical problem to be solved. The composite left-right hand structure and the dual composite left-right hand structure are widely applied to the design of power dividers and filters due to the sub-wavelength structure, however, references which can be referred to are ：[1] G. Shen, W. Che, Q. Xue, and W. Feng, "Novel design of miniaturized filtering power dividers using dual-composite right-/left-handed resonators,"; [2] G. Shen, W. Che, W. Feng, Q. Xue, "High-isolation topology for filtering power dividers based on complex isolation impedance and surface wave suppression," ., however, the application of the structures in a high frequency band (such as an X band) has not been fully researched and verified, so that a miniaturized filtering power divider with high performance is lacking in the frequency band, and urgent demands of a high-frequency communication system on integration and miniaturization are difficult to meet. Disclosure of Invention The invention aims to provide a miniaturized broadband power division filter applied to an X frequency band, aiming at the defects of larger size, limited high-frequency application and insufficient performance index of the traditional filtering power division filter. The technical scheme of the invention is that the miniaturized broadband power division filter applied to the X frequency band comprises a metal layer and a dielectric substrate layer, wherein the metal layer is divided into two layers, and comprises an upper metal layer and a lower metal layer; The upper metal layer comprises a section of input feeder line, a first output feeder line, a second output feeder line, an isolation resistor, a first filtering branch and a second filtering branch, wherein the first filtering branch and the second filtering branch respectively comprise two identical dual composite left-right-hand resonance units; The lower metal layer is of a metal grounding plate structure, and two grooves are formed in the metal grounding plate; The four identical dual composite left-right hand resonance units are dual composite left-right hand resonators, each of which comprises a pair of toe-crossing capacitors and a section of transmission line inductor, and two ends of the transmission line inductor are connected with two ends of the toe-crossing capacitors; The four dual-composite left-hand and right-hand resonance units are distributed in a 2X 2 matrix form, the left two resonance units are respectively and directly connected with two branches of an input feeder, isolation resistors are bridged between the two branches, and the right two resonance units are respectively and directly connected with a first output feeder and a second output feeder. Preferably, the upper metal layer adopts copper with the thickness of 0.035mm as metal, the dielectric substrate layer adopts Rogers5880, the dielectric constant is 2.2, the thickness is 0.787mm, and the loss tangent is 0.0009. Preferably, the line width and the line length of the toe crossing capacitor are both greater than 0.125mm, the gap between the toe crossing capacitors is greater than 0.125mm, the line width and the line length of the transmis