CN-119253227-B - Ultra-wideband Wilkinson power divider based on liquid crystal material

Abstract

The invention provides an ultra-wideband Wilkinson power divider based on a liquid crystal material, which relates to the technical field of microwaves, and realizes uniform distribution and isolation of microwave signals in a multi-layer medium comprising a liquid crystal layer by designing the length and characteristic impedance of a transmission line and adopting a specific isolation resistance structure to complete impedance matching between the transmission lines. The power divider is subjected to modeling simulation in three-dimensional electromagnetic field simulation software, and simulation results show that the insertion loss is integrally smaller than 3.6dB, and the relative bandwidth reaches 100%.

Inventors

• ZHANG YAN
• CAO HENGZHI
• LI SHIZE

Assignees

• 北京航空航天大学

Dates

Publication Date

20260512

Application Date

20241018

Claims (6)

1. 1. An ultra-wideband Wilkinson power divider based on liquid crystal material is characterized by comprising a lower floor, a medium substrate, a lower glass substrate, a liquid crystal layer, an upper glass substrate and an upper floor which are sequentially overlapped from bottom to top, The metal strip units and the chip resistor units are arranged between the dielectric substrate and the lower glass substrate, and signals are uniformly distributed and isolated through the metal strip units and the chip resistor units; The metal strip units comprise a plurality of strip lines which are connected in sequence, and the line widths are different; The patch resistor unit comprises a plurality of resistors for isolation, wherein the resistors are distributed among the strip lines of the metal strips, and the impedance sizes are different.
2. 2. The ultra-wideband wilkinson power divider based on liquid crystal material according to claim 1, wherein the impedance transformation part of the metal strip unit adopts chebyshev multisection matching transformer design characteristic impedance, and the transformation order is N.
3. 3. The ultra-wideband wilkinson power divider based on liquid crystal material according to claim 2, wherein the number of the chip resistors is the same as the conversion order N, the size of the chip resistors is the same, and the impedance is different.
4. 4. The ultra-wideband wilkinson power divider based on liquid crystal material according to claim 1, wherein the lower glass substrate and the upper glass substrate have the same relative dielectric constant and thickness.
5. 5. An ultra wideband wilkinson power divider based on liquid crystal material according to claim 1, characterized in that said metal strip unit comprises a plurality of metal strips connected in sequence, wherein, The first metal strip is a linear strip line, one end of the first metal strip is used as an input port, and the other end of the first metal strip is connected with the second metal strip; the second metal strip is a rectangular frame-shaped strip line with one end open, and the first metal strip is connected with one end of the rectangular frame-shaped strip line of the second metal strip, which is not open; The third metal strip is a T-shaped frame-shaped strip line, the T-shaped frame-shaped strip line comprises a rectangular frame-shaped strip line with one end open and two parallel linear strip lines connected with one end open, and the third metal strip is connected with the second metal strip through the two parallel linear strip lines of the third metal strip; the fourth metal strip is a T-shaped frame-like strip line, the T-shaped frame-like strip line comprises a rectangular frame-shaped strip line with two open ends and two parallel linear strip lines connected with one open end of the rectangular frame-shaped strip line, and the fourth metal strip is connected with the third metal strip through the two parallel linear strip lines of the fourth metal strip; The fifth metal strip is two inverted L-shaped strip lines which are symmetrically placed, the short sides of the two inverted L-shaped strip lines are parallel and are respectively connected with the opening at the other end of the rectangular frame-shaped strip line of the fourth metal strip, and the long sides of the two inverted L-shaped strip lines extend in the direction away from each other respectively and serve as a left output port and a right output port.
6. 6. An ultra wideband wilkinson power divider based on liquid crystal material according to claim 1, characterized in that the chip resistor unit comprises three chip resistors, the first chip resistor being located between two parallel linear striplines of the third metal strip, the second chip resistor being located between two parallel linear striplines of the fourth metal strip, the third chip resistor being located between the short sides of two inverted-L striplines of the fifth metal strip.

Description

Ultra-wideband Wilkinson power divider based on liquid crystal material Technical Field The invention belongs to the field of radio frequency and microwave electronics, and particularly relates to an ultra-wideband Wilkinson power divider based on a liquid crystal material. Background The invention of the power divider was invented in the 40 th century, after which scientific researchers made various attempts to optimize the performance of the power divider, and designed power dividers of different structures. The common power divider comprises a Wilkinson power divider, a Bagley polygonal power divider, a Gysel power divider and the like, wherein the Wilkinson power divider is widely applied to the field of microwave communication by virtue of the excellent performance of the Wilkinson power divider, and becomes one of the most used microwave passive devices. In 1960, the Wilkinson power divider was invented by e.j. Wilkinson, and the Wilkinson power divider was used as a resistive power divider, and has a characteristic of high isolation compared with a T-type power divider. In 1968, s.b. cohn proposed to expand bandwidth of a Wilkinson power divider by adopting multistage ladder impedance transformation for the first time, explained the principle by a parity-mode analysis method, provided a design method and a design result, and then a subsequent person can design the broadband Wilkinson power divider with excellent performance by only looking up a table. In 1977, NOBUO NAGAI proposed a planar power divider for the first time, and replaced the previous coaxial line structure with a planar transmission line and an isolation resistor, which is easier to process and integrate, so that the PCB layout power divider is widely used. Disclosure of Invention In order to solve the technical problems, the invention provides an ultra-wideband Wilkinson power divider based on a liquid crystal material for realizing signal distribution and isolation in the presence of a variable dielectric constant medium, realizes equal power distribution of microwave signals in a multi-layer medium comprising a liquid crystal layer, has the advantages of low loss and high isolation, and has wider working bandwidth. In order to achieve the above purpose, the invention adopts the following technical scheme: An ultra-wideband Wilkinson power divider based on liquid crystal material comprises a lower floor, a medium substrate, a lower glass substrate, a liquid crystal layer, an upper glass substrate and an upper floor which are sequentially overlapped from bottom to top, The metal strip units and the chip resistor units are arranged between the dielectric substrate and the lower glass substrate, and signals are uniformly distributed and isolated through the metal strip units and the chip resistor units; The metal strip units comprise a plurality of strip lines which are connected in sequence, and the line widths are different; The patch resistor unit comprises a plurality of resistors for isolation, wherein the resistors are distributed among the strip lines of the metal strips, and the impedance sizes are different. Furthermore, the impedance transformation part of the metal strip unit adopts Chebyshev multisection matching transformer to design characteristic impedance, and the transformation order is N. Furthermore, the number of the chip resistors is the same as the conversion order N in the previous step, the size of the chip resistors is the same, and the impedance is different. Further, the lower glass substrate and the upper glass substrate have the same relative dielectric constant and thickness. Further, the metal strip unit comprises a plurality of metal strips which are connected in sequence, wherein, The first metal strip is a linear strip line, one end of the first metal strip is used as an input port, and the other end of the first metal strip is connected with the second metal strip; the second metal strip is a rectangular frame-shaped strip line with one end open, and the first metal strip is connected with one end of the rectangular frame-shaped strip line of the second metal strip, which is not open; The third metal strip is a T-shaped frame-shaped strip line, the T-shaped frame-shaped strip line comprises a rectangular frame-shaped strip line with one end open and two parallel linear strip lines connected with one end open, and the third metal strip is connected with the second metal strip through the two parallel linear strip lines of the third metal strip; the fourth metal strip is a T-shaped frame-like strip line, the T-shaped frame-like strip line comprises a rectangular frame-shaped strip line with two open ends and two parallel linear strip lines connected with one open end of the rectangular frame-shaped strip line, and the fourth metal strip is connected with the third metal strip through the two parallel linear strip lines of the fourth metal strip; The fifth metal strip is two inverted L-shaped strip lines