CN109860963B - Liquid crystal filtering phase shifter based on comb-shaped microstrip line and hairpin resonator array - Google Patents
Liquid crystal filtering phase shifter based on comb-shaped microstrip line and hairpin resonator array Download PDFInfo
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Abstract
A liquid crystal filtering phase shifter based on a comb-shaped microstrip line and a hairpin resonator array belongs to the technical field of microwave devices and solves the problems that the existing phased array radar system is large in size and large in loss due to the fact that a phase shifter and a filter are separately and independently designed. The liquid crystal filter phase shifter comprises: the rectangular strip microstrip line, the comb-shaped microstrip line and the hairpin resonator array are all arranged on the bottom surface of the top dielectric layer. The comb-shaped microstrip line is arranged on one side of the rectangular strip-shaped microstrip line, and the rectangular strip-shaped microstrip line is arranged on the bottom surface of the top dielectric layer in a whole length manner. The hairpin resonator array is an array line consisting of a plurality of hairpin resonators, and is arranged on the other side of the rectangular strip microstrip line along the length direction of the rectangular strip microstrip line, and a gap is reserved between the rectangular strip microstrip line and the hairpin resonator array. The middle area of the middle medium layer is arranged in a hollow mode, and a liquid crystal layer is formed by filling liquid crystal materials. And a metal film is arranged on the top surface of the bottom dielectric layer. The comb-shaped microstrip line and the metal film are tightly attached to the liquid crystal layer.
Description
Technical Field
The invention relates to a filtering phase shifter, and belongs to the technical field of microwave devices.
Background
In the front-end design of the existing phased array radar system, the phase shifter and the filter are often separately and separately designed and then connected through a 50 Ω transmission line. However, the implementation of the phase shifter and the filter separately and individually leads to the following problems:
the introduced transmission line leads to the volume increase of the radio frequency front end of the phased array radar system, which seriously limits the application scene of the phased array radar system.
Secondly, the impedance mismatch of the transmission line generated when the phase shifter and the filter are connected and the loss of the transmission line can cause the loss of the phased array radar system to be increased, which seriously reduces the overall performance of the phased array radar system.
Disclosure of Invention
The invention provides a liquid crystal filter phase shifter based on a comb microstrip line and a hairpin resonator array, aiming at solving the problems of large volume and large loss of the existing phased array radar system caused by the fact that a phase shifter and a filter are separately and independently designed.
The liquid crystal filter phase shifter based on the comb-shaped microstrip line and the hairpin resonator array comprises a top dielectric layer 1, a middle dielectric layer 2 and a bottom dielectric layer 3;
a comb-shaped microstrip line 4 and a hairpin resonator array 5 are arranged on the bottom surface of the top dielectric layer 1;
the comb-shaped microstrip line 4 comprises a rectangular strip microstrip line 4-1 and a comb-shaped microstrip line 4-2, the comb-shaped microstrip line 4-2 is arranged on one side of the rectangular strip microstrip line 4-1, and the rectangular strip microstrip line 4-1 is arranged on the bottom surface of the top dielectric layer 1 in a full-length mode;
the hairpin resonator array 5 is an array of lines formed by a plurality of hairpin resonators, is arranged on the other side of the rectangular strip microstrip line 4-1 along the length direction of the rectangular strip microstrip line 4-1, and a gap is reserved between the hairpin resonator array 5 and the rectangular strip microstrip line 4-1;
the middle area of the middle medium layer 2 is arranged in a hollow mode, and a liquid crystal layer 6 is formed by filling liquid crystal materials;
a metal film 7 is arranged on the top surface of the bottom dielectric layer 3;
the comb-shaped microstrip line 4 and the metal film 7 are tightly attached to the liquid crystal layer 6;
when the liquid crystal filter phase shifter is in a working state, the comb-shaped microstrip line 4 is a transmission line of radio frequency signals, bias voltage is loaded at two ends of the liquid crystal layer 6 through the comb-shaped microstrip line 4 and the metal film 7, and the liquid crystal layer 6 shifts the phase of the radio frequency signals; the hairpin resonator array 5 resonates the microstrip comb 4, and the microstrip comb 4 filters the radio frequency signal.
Preferably, the top dielectric layer 1, the middle dielectric layer 2 and the bottom dielectric layer 3 are all microwave plates, the relative dielectric constant of the microwave plates ranges from 2 to 10, and the loss tangent is less than or equal to 0.01;
the top dielectric layer 1, the middle dielectric layer 2 and the bottom dielectric layer 3 are all rectangular plates, the lengths of the top dielectric layer 1, the middle dielectric layer 2 and the bottom dielectric layer are equal, and the widths of the top dielectric layer, the middle dielectric layer 2 and the bottom dielectric layer are equal;
the thicknesses of the top dielectric layer 1 and the bottom dielectric layer 3 are less than 5mm, and the thickness of the middle dielectric layer 2 is greater than or equal to 0.1mm and less than or equal to 0.6 mm.
Preferably, the width direction, the length direction and the thickness direction of the top dielectric layer 1 are respectively defined as the x direction, the y direction and the z direction, and the rectangular strip microstrip line 4-1 is arranged on the bottom surface of the top dielectric layer 1 along the y direction;
rectangular strip microstrip line4-1 has a size wms×lms，wmsIs the length of the rectangular strip microstrip line 4-1 in the x direction, lmsThe length of the rectangular strip microstrip line 4-1 in the y direction is more than or equal to 1mm and less than or equal to wms≤4mm。
Preferably, the comb-shaped microstrip line 4-2 comprises a plurality of branch microstrip lines, and the plurality of branch microstrip lines are all vertically arranged with the rectangular strip microstrip line 4-1 and distributed at equal intervals in the y direction;
the size of the branch microstrip line is hs×ws，hsIs the length of the minor microstrip line in the x direction, wsH is not less than 0.15mm and is the length of the minor-pitch microstrip line in the y directions≤3.5mm。
Preferably, the plurality of hairpin resonators are respectively a first hairpin resonator to an nth hairpin resonator;
each hairpin resonator is a rectangular frame with an open end, the lengths of the hairpin resonators in the y direction are equal, and the lengths of the first hairpin resonator to the Nth hairpin resonator in the x direction are uniformly increased;
the end of each hairpin resonator opposite to its open end is its first closed end;
for a first hairpin type resonator to an Nth hairpin type resonator which form a linear array, the open end of the former faces the first closed end of the latter, the minimum spacing between each hairpin type resonator and the rectangular strip microstrip line 4-1 is equal, and the minimum spacing between two adjacent hairpin type resonators is equal;
the radio frequency signal is transmitted from the direction of the first closed end of the card resonator to the direction of the open end of the card resonator on the comb-shaped microstrip line 4.
Preferably, the liquid crystal layer 6 has a rectangular area, and the size of the liquid crystal layer 6 is wLC×lLC，wLCIs the length of the liquid crystal layer 6 in the x direction, wLC＝wms+hs+wu，wuThe distance that the liquid crystal layer 6 extends outwards due to the edge effect of the comb-shaped microstrip line 4-2, lLCIs the length of the liquid crystal layer 6 in the y-direction, lLC≥50mm；
One side of the liquid crystal layer 6 is flush with the other side of the rectangular strip-shaped microstrip line 4-1, and two ends of the liquid crystal layer 6 are respectively flush with two ends of the comb-shaped microstrip line 4-2.
Preferably, the first end and the second end of the comb-shaped microstrip line 4-2 are respectively close to the first hairpin type resonator and the Nth hairpin type resonator;
the projection length of the minimum distance between the closed end of the first hairpin type resonator and the first end of the comb-shaped microstrip line 4-2 in the y direction is equal to the projection length of the minimum distance between the open end of the Nth hairpin type resonator and the second end of the comb-shaped microstrip line 4-2 in the y direction, and the projection lengths are all 0.1-0.5 mm.
Preferably, the thickness of the metal film 7 is less than 1 mm.
Preferably, when no bias voltage is applied across the liquid crystal layer 6, the long axes of the liquid crystal molecules are all perpendicular to the z direction.
The liquid crystal filtering phase shifter based on the comb microstrip line and the hairpin resonator array realizes the design of the combination of the filter and the phase shifter, and the working principle of simultaneously realizing the phase shifting and filtering functions is as follows:
the comb-shaped microstrip line 4 is a transmission line of radio frequency signals, bias voltage is loaded at two ends of the liquid crystal layer 6 through the comb-shaped microstrip line 4 and the metal film 7, and the liquid crystal layer 6 shifts the phase of the radio frequency signals; the hairpin resonator array 5 resonates the microstrip comb 4, and the microstrip comb 4 filters the radio frequency signal.
According to the working principle, the liquid crystal filter phase shifter based on the comb-shaped microstrip line and the hairpin resonator array can simultaneously perform phase shifting and filtering on radio frequency signals.
Compared with the existing phased array radar system which separately designs the phase shifter and the filter, the liquid crystal filter phase shifter based on the comb-shaped microstrip line and the hairpin resonator array has small volume and low loss because no transmission line needs to be introduced.
Drawings
The liquid crystal filter phase shifter based on the comb microstrip line and the hairpin resonator array according to the present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, in which:
fig. 1 is an exploded view of a liquid crystal filter phase shifter based on a microstrip comb and a hairpin resonator array according to an embodiment;
FIG. 2 is a schematic diagram showing the relative positions of the comb-shaped microstrip line, the hairpin resonator array, and the liquid crystal layer according to the embodiment;
FIG. 3 is a schematic diagram showing the variation of the liquid crystal molecular arrangement with the bias voltage according to the embodiment, wherein the arrow direction represents the electric field direction, and the liquid crystal molecules from left to right are respectively in the bias state, between the alignment state and the bias state, and in the bias state;
FIG. 4 is a graph of the return loss of the liquid crystal filter phase shifter according to the embodiment with respect to the operating frequency, wherein VSim，biasIs a bias voltage;
FIG. 5 is a graph of the insertion loss of the liquid crystal filter phase shifter according to the embodiment with respect to the operating frequency;
FIG. 6 is a graph of the variation of the phase of the liquid crystal filter phase shifter with the operating frequency according to the embodiment;
FIG. 7 is a graph of the variation of the quality factor of the LC phase shifter with the operating frequency according to the embodiment.
Detailed Description
The liquid crystal filter phase shifter based on the comb microstrip line and the hairpin resonator array according to the present invention will be further described with reference to the accompanying drawings.
Example (b): the present embodiment will be described in detail with reference to fig. 1 to 7.
The liquid crystal filter phase shifter based on the comb-shaped microstrip line and the hairpin resonator array comprises a top dielectric layer 1, a middle dielectric layer 2 and a bottom dielectric layer 3;
a comb-shaped microstrip line 4 and a hairpin resonator array 5 are arranged on the bottom surface of the top dielectric layer 1;
the comb-shaped microstrip line 4 comprises a rectangular strip microstrip line 4-1 and a comb-shaped microstrip line 4-2, the comb-shaped microstrip line 4-2 is arranged on one side of the rectangular strip microstrip line 4-1, and the rectangular strip microstrip line 4-1 is arranged on the bottom surface of the top dielectric layer 1 in a full-length mode;
the hairpin resonator array 5 is an array of lines formed by a plurality of hairpin resonators, is arranged on the other side of the rectangular strip microstrip line 4-1 along the length direction of the rectangular strip microstrip line 4-1, and a gap is reserved between the hairpin resonator array 5 and the rectangular strip microstrip line 4-1;
the middle area of the middle medium layer 2 is arranged in a hollow mode, and a liquid crystal layer 6 is formed by filling liquid crystal materials;
a metal film 7 is arranged on the top surface of the bottom dielectric layer 3;
the comb-shaped microstrip line 4 and the metal film 7 are tightly attached to the liquid crystal layer 6;
when the liquid crystal filter phase shifter is in a working state, the comb-shaped microstrip line 4 is a transmission line of radio frequency signals, bias voltage is loaded at two ends of the liquid crystal layer 6 through the comb-shaped microstrip line 4 and the metal film 7, and the liquid crystal layer 6 shifts the phase of the radio frequency signals; the hairpin resonator array 5 resonates the microstrip comb 4, and the microstrip comb 4 filters the radio frequency signal.
In this embodiment, the comb-shaped microstrip line 4-2 is a main transmission line of the radio frequency signal and is coupled with the hairpin resonator array 5 in a resonance state. The rectangular strip microstrip line 4-1 mainly plays a role of wave guiding.
In the embodiment, the top dielectric layer 1, the middle dielectric layer 2 and the bottom dielectric layer 3 are all microwave plates, the relative dielectric constant range of the microwave plates is 2-10, and the loss tangent is less than or equal to 0.01;
the top dielectric layer 1, the middle dielectric layer 2 and the bottom dielectric layer 3 are all rectangular plates, the lengths of the top dielectric layer 1, the middle dielectric layer 2 and the bottom dielectric layer are equal, and the widths of the top dielectric layer, the middle dielectric layer 2 and the bottom dielectric layer are equal;
the thicknesses of the top dielectric layer 1 and the bottom dielectric layer 3 are less than 5mm, and the thickness of the middle dielectric layer 2 is greater than or equal to 0.1mm and less than or equal to 0.6 mm.
In the embodiment, the width direction, the length direction and the thickness direction of the top dielectric layer 1 are respectively defined as the x direction, the y direction and the z direction, and the rectangular strip microstrip line 4-1 is arranged on the bottom surface of the top dielectric layer 1 along the y direction;
the size of the rectangular strip microstrip line 4-1 is wms×lms，wmsIs the length of the rectangular strip microstrip line 4-1 in the x direction, lmsIs the length of the rectangular strip-shaped microstrip line 4-1 in the y direction.
In this embodiment, w ismsThe characteristic impedance of the signal line is obviously influenced, good impedance matching is difficult to realize if the characteristic impedance is too large or too small, and the value range is determined by combining the thickness and the dielectric constant range of the existing dielectric plate: w is not less than 1mmms≤4mm。
The comb-shaped microstrip line 4-2 of the embodiment comprises a plurality of branch microstrip lines, and the plurality of branch microstrip lines are all vertically arranged with the rectangular strip microstrip line 4-1 and distributed at equal intervals in the y direction;
the size of the branch microstrip line is hs×ws，hsIs the length of the minor microstrip line in the x direction, wsThe length of the branch microstrip line in the y direction.
In the present embodiment, hsThe phase tuning rate of the liquid crystal filter phase shifter is obviously influenced, and the value range is determined by combining the thickness and the dielectric constant range of the existing dielectric plate: h is not more than 0.15mms≤3.5mm。
The plurality of hairpin resonators of the present embodiment are respectively a first hairpin resonator to an nth hairpin resonator;
each hairpin resonator is a rectangular frame with an open end, the lengths of the hairpin resonators in the y direction are equal, and the lengths of the first hairpin resonator to the Nth hairpin resonator in the x direction are uniformly increased;
the end of each hairpin resonator opposite to its open end is its first closed end;
for a first hairpin type resonator to an Nth hairpin type resonator which form a linear array, the open end of the former faces the first closed end of the latter, the minimum spacing between each hairpin type resonator and the rectangular strip microstrip line 4-1 is equal, and the minimum spacing between two adjacent hairpin type resonators is equal;
the radio frequency signal is transmitted from the direction of the first closed end of the card resonator to the direction of the open end of the card resonator on the comb-shaped microstrip line 4.
In this embodiment, the sum of the lengths of the three sides of the hairpin resonator has a direct influence on the filtering resonance frequency point, and the relationship between the wavelength of the filtering resonance frequency point and the sum of the lengths of the three sides of the hairpin resonator is as follows: lambda [ alpha ]g,0＝(2wi+hi) /4, wherein wiLength of hairpin resonator in x direction, hiIs the length of the hairpin resonator in the y-direction.
The liquid crystal layer 6 of this embodiment is a rectangular region, and the size of the liquid crystal layer 6 is wLC×lLC，wLCIs the length of the liquid crystal layer 6 in the x direction, wLC＝wms+hs+wu，wuThe distance that the liquid crystal layer 6 extends outwards due to the edge effect of the comb-shaped microstrip line 4-2, lLCIs the length of the liquid crystal layer 6 in the y direction;
one side of the liquid crystal layer 6 is flush with the other side of the rectangular strip-shaped microstrip line 4-1, and two ends of the liquid crystal layer 6 are respectively flush with two ends of the comb-shaped microstrip line 4-2.
In the present embodiment, in order to realize a large phase shift amount and stable electrical properties, l is consideredLCThe value range of (A) is defined as: lLCNot less than 50 mm. The thickness of the liquid crystal layer 6 is consistent with that of the middle medium layer 2, the electric alignment response time of liquid crystal molecules and the overall performance of the liquid crystal filter phase shifter are comprehensively considered, and the value range of the thickness of the liquid crystal layer 6 is determined as follows: h is not less than 0.1mm2≤0.6mm。
A first end and a second end of the comb-shaped microstrip line 4-2 of the embodiment are respectively close to the first hairpin type resonator and the Nth hairpin type resonator;
the projection length of the minimum distance between the closed end of the first hairpin type resonator and the first end of the comb-shaped microstrip line 4-2 in the y direction is equal to the projection length of the minimum distance between the open end of the Nth hairpin type resonator and the second end of the comb-shaped microstrip line 4-2 in the y direction, and the projection lengths are all 0.1-0.5 mm.
The thickness of the metal film 7 of the present embodiment is less than 1 mm.
In this embodiment, when no bias voltage is applied across the liquid crystal layer 6, the long axes of the liquid crystal molecules are all perpendicular to the z direction, i.e., the liquid crystal molecules are in an aligned state.
The bottom dielectric layer 3 of the present embodiment is located below the middle dielectric layer 2 and the liquid crystal layer 6, and is used for encapsulating the lower part of the liquid crystal layer 6. Alignment films are arranged on the parts of the top dielectric layer 1 and the metal film 7, which are in contact with the liquid crystal layer 6, and the bottom surfaces of the comb-shaped microstrip lines 4, and are used for enabling the long axes of liquid crystal molecules to be vertical to the z direction when bias voltage is not applied to the two ends of the liquid crystal layer 6. Any scheme can be adopted for forming the alignment film as long as the initial alignment effect of the liquid crystal molecules is realized.
The liquid crystal filter phase shifter has good phase shifting and filtering functions as will be described by specific examples and data below:
the specific example shows a liquid crystal filter phase shifter working at 2-9 GHz.
Bias voltage is loaded at two ends of the liquid crystal layer 6 through the comb-shaped microstrip line 4 and the metal film 7, the arrangement of liquid crystal molecules can be changed by adjusting the bias voltage, and further the relative dielectric constant epsilon of the liquid crystal layer 6 in all directions is changedLC。
The liquid crystal selected for this specific example has a relative dielectric constant ε in the direction of action at a bias voltage of 0VLC2.5, a relative dielectric constant ε in the acting direction at a bias voltage of 25VLC3.2, i.e., the relative dielectric constant ε of the liquid crystal when the bias voltage is changed from 0V to 25VLCThe phase of the radio frequency signal can be continuously adjusted within the range of 2.5-3.2, so that the liquid crystal filter phase shifter can regulate and control the phase of the radio frequency signal. In addition, the liquid crystal selected for this specific example has a stable loss tangent of 0.025 at the microwave band.
During operation, radio frequency signals are transmitted from the direction of the first closed end of the card resonator to the direction of the open end of the card resonator on the comb-shaped microstrip line 4. The electrical performance data of the liquid crystal filter phase shifter are obtained under the condition that the effective dielectric constant of the liquid crystal layer 6 is changed by applying a bias voltage to both ends of the liquid crystal layer 6 through the biaser, as shown in fig. 4 to 7.
FIG. 4 is a graph of the return loss of the LC wave-filter phase shifter as a function of operating frequency. As can be seen from FIG. 4, the impedance matching of the liquid crystal filter phase shifter is good and the return loss is lower than-10 dB in the whole pass band frequency range (2-4.2 GHz and 6.2-9 GHz) no matter whether the bias voltage is 0V or 25V.
FIG. 5 is a graph showing the variation of the insertion loss of the liquid crystal filter phase shifter with the operating frequency. As can be seen from fig. 5, the insertion loss of the liquid crystal filter phase shifter is controlled to be within 2.5dB over the entire passband.
FIG. 6 is a graph showing the variation of the phase of the liquid crystal filter phase shifter with the operating frequency. As can be seen from fig. 6, the lc filter phase shifter can achieve a phase shift of 30 ° to 190 ° over the entire passband.
FIG. 7 is a graph of the variation of the quality factor of the LC phase shifter with the operating frequency. As can be seen from FIG. 7, the quality factor is 26 °/dB to 51 °/dB over the entire passband. In addition, within the range of the stop band (4.5-6 GHz), the attenuation of the stop band is more than 15dB, and the noise suppression circuit has a good noise suppression effect.
According to the data, the liquid crystal filter phase shifter can realize the composite functions of phase shifting and filtering, and can realize good loss and quality factors in a pass band and stable filtering in a stop band through optimized design.
The liquid crystal filter phase shifter based on the comb microstrip line and the hairpin resonator array has the following advantages:
the comb-tooth-shaped microstrip line is used as a main transmission line of a radio frequency signal, and the liquid crystal filter phase shifter has an obvious effect on improving the phase tuning rate and the quality factor.
And the comb-shaped microstrip line and the hairpin resonator array in the resonance state are coupled, so that the stable filtering frequency band range is ensured, and the aim of filtering noise and interference signals while continuously adjusting the phase is fulfilled.
And when the liquid crystal filter phase shifter is applied to systems such as phased array radar and the like, the liquid crystal filter phase shifter can completely replace the cascading form of the existing filter and phase shifter, and has obvious advantages in the aspects of reducing the weight of the system, reducing the volume of the system and the like.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (9)
1. The liquid crystal filter phase shifter is characterized by comprising a top dielectric layer (1), a middle dielectric layer (2) and a bottom dielectric layer (3);
a comb-shaped microstrip line (4) and a hairpin resonator array (5) are arranged on the bottom surface of the top dielectric layer (1);
the comb-shaped microstrip line (4) comprises a rectangular strip microstrip line (4-1) and a comb-shaped microstrip line (4-2), the comb-shaped microstrip line (4-2) is arranged on one side of the rectangular strip microstrip line (4-1), and the rectangular strip microstrip line (4-1) is arranged on the bottom surface of the top dielectric layer (1) in a long way;
the hairpin resonator array (5) is an array of lines formed by a plurality of hairpin resonators, is arranged on the other side of the rectangular strip microstrip line (4-1) along the length direction of the rectangular strip microstrip line (4-1), and a gap is reserved between the hairpin resonator array (5) and the rectangular strip microstrip line (4-1);
the middle area of the middle medium layer (2) is arranged in a hollow mode, and a liquid crystal layer (6) is formed by filling liquid crystal materials;
a metal film (7) is arranged on the top surface of the bottom dielectric layer (3);
the comb-shaped microstrip line (4) and the metal film (7) are tightly attached to the liquid crystal layer (6);
when the liquid crystal filter phase shifter is in a working state, the comb-shaped microstrip line (4) is a transmission line of radio-frequency signals, bias voltage is loaded at two ends of the liquid crystal layer (6) through the comb-shaped microstrip line (4) and the metal film (7), and the liquid crystal layer (6) shifts the phase of the radio-frequency signals; the hairpin resonator array (5) enables the comb-shaped microstrip line (4) to resonate, and the comb-shaped microstrip line (4) filters radio frequency signals.
2. The comb-microstrip and hairpin resonator array-based liquid crystal filter phase shifter as claimed in claim 1, wherein the top dielectric layer (1), the middle dielectric layer (2) and the bottom dielectric layer (3) are all microwave plates, the relative dielectric constant of the microwave plates ranges from 2 to 10, and the loss tangent is less than or equal to 0.01;
the top dielectric layer (1), the middle dielectric layer (2) and the bottom dielectric layer (3) are all rectangular plates, the lengths of the top dielectric layer, the middle dielectric layer and the bottom dielectric layer are equal, and the widths of the top dielectric layer, the middle dielectric layer and the bottom dielectric layer are equal;
the thicknesses of the top dielectric layer (1) and the bottom dielectric layer (3) are less than 5mm, and the thickness of the middle dielectric layer (2) is greater than or equal to 0.1mm and less than or equal to 0.6 mm.
3. The comb-microstrip and hairpin resonator array-based liquid crystal filter phase shifter according to claim 2, characterized in that the width direction, the length direction, and the thickness direction of the top dielectric layer (1) are defined as x-direction, y-direction, and z-direction, respectively, and the rectangular strip-shaped microstrip line (4-1) is disposed on the bottom surface of the top dielectric layer (1) throughout the y-direction;
the size of the rectangular strip microstrip line (4-1) is wms×lms，wmsIs the length of a rectangular strip microstrip line (4-1) in the x direction, lmsIs the length of a rectangular strip microstrip line (4-1) in the y direction, w is more than or equal to 1mmms≤4mm。
4. The liquid crystal filter phase shifter based on the microstrip comb and the hairpin resonator array as claimed in claim 3, wherein the microstrip comb (4-2) comprises a plurality of microstrip stubs which are all vertically arranged with the microstrip rectangular strip (4-1) and are distributed at equal intervals in the y direction;
the size of the branch microstrip line is hs×ws，hsIs the length of the minor microstrip line in the x direction, wsH is not less than 0.15mm and is the length of the minor-pitch microstrip line in the y directions≤3.5mm。
5. The comb-microstrip and hairpin resonator array-based liquid crystal filter phase shifter as claimed in claim 4, wherein the plurality of hairpin resonators are respectively a first hairpin resonator through an Nth hairpin resonator;
each hairpin resonator is a rectangular frame with an open end, the lengths of the hairpin resonators in the y direction are equal, and the lengths of the first hairpin resonator to the Nth hairpin resonator in the x direction are uniformly increased;
the end of each hairpin resonator opposite to its open end is its first closed end;
for a first hairpin type resonator to an Nth hairpin type resonator which form a linear array, the open end of the former faces the first closed end of the latter, the minimum spacing between each hairpin type resonator and a rectangular strip microstrip line (4-1) is equal, and the minimum spacing between two adjacent hairpin type resonators is equal;
radio frequency signals are transmitted from the direction of the first closed end of the card resonator to the direction of the open end of the card resonator on the comb-shaped microstrip line (4).
6. Liquid crystal filter phase shifter based on microstrip combline and hairpin resonator arrays according to claim 5 wherein the liquid crystal layer (6) is a rectangular area and the size of the liquid crystal layer (6) is wLC×lLC，wLCIs the length of the liquid crystal layer (6) in the x-direction, wLC＝wms+hs+wu，wuThe distance that the liquid crystal layer (6) extends outwards due to the edge effect of the comb-shaped microstrip line (4-2) /)LCIs the length of the liquid crystal layer (6) in the y-direction, lLC≥50mm；
One side of the liquid crystal layer (6) is flush with the other side of the rectangular strip-shaped microstrip line (4-1), and two ends of the liquid crystal layer (6) are respectively flush with two ends of the comb-shaped microstrip line (4-2).
7. The liquid crystal filter phase shifter based on the comb-shaped microstrip line and the hairpin resonator array as claimed in claim 6, wherein the first end and the second end of the comb-shaped microstrip line (4-2) are respectively close to the first hairpin resonator and the Nth hairpin resonator;
the projection length of the minimum distance between the closed end of the first hairpin type resonator and the first end of the comb-shaped microstrip line (4-2) in the y direction is equal to the projection length of the minimum distance between the open end of the N hairpin type resonator and the second end of the comb-shaped microstrip line (4-2) in the y direction, and the projection lengths are all 0.1-0.5 mm.
8. Liquid crystal filter phase shifter based on comb microstrip and hairpin resonator arrays according to claim 7, characterized in that the thickness of the metal film (7) is less than 1 mm.
9. The comb-microstrip and hairpin resonator array-based liquid crystal filter phase shifter according to claim 8, characterized in that the long axes of the liquid crystal molecules are perpendicular to the z-direction when no bias voltage is applied across the liquid crystal layer (6).
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| CN101719576A (en) * | 2009-12-02 | 2010-06-02 | 华东交通大学 | Embedded microwave bandpass filter |
| US8143972B2 (en) * | 2008-09-26 | 2012-03-27 | Kabushiki Kaisha Toshiba | Resonator and filter |
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| JP6490928B2 (en) * | 2014-09-08 | 2019-03-27 | 株式会社東芝 | Multiband filter |
| CN104810579A (en) * | 2015-05-12 | 2015-07-29 | 中国矿业大学 | Tunable bandstop filter based on artificial surface plasmon |
| CN107994302B (en) * | 2017-11-27 | 2020-11-27 | 京东方科技集团股份有限公司 | Liquid crystal phase shifter and working method thereof |
| CN208489337U (en) * | 2018-08-23 | 2019-02-12 | 江苏师范大学 | A kind of broadband band-pass filter |
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| US8143972B2 (en) * | 2008-09-26 | 2012-03-27 | Kabushiki Kaisha Toshiba | Resonator and filter |
| CN101719576A (en) * | 2009-12-02 | 2010-06-02 | 华东交通大学 | Embedded microwave bandpass filter |
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