Band-pass phase shifter and antenna device
By combining the dielectric substrate, metal layer, and dielectric functional layer of the bandpass phase shifter, and utilizing the coupling setup of the dual composite transmission line and the adjustment of the dielectric constant, the problem of large space occupation by the filtering and phase shifting devices is solved, achieving miniaturization and performance improvement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2026-03-31
AI Technical Summary
In existing communication systems, filtering and phase-shifting devices occupy a large space, making miniaturization difficult.
By employing a bandpass phase shifter, and through a combination design of dielectric substrate, metal layer and dielectric functional layer, the filtering and phase shifting functions are integrated by utilizing the coupling setting of dual composite transmission lines and the adjustment of dielectric constant, thereby reducing the number of devices.
It integrates filtering and phase shifting functions, features a miniaturized design, and improves the space utilization and performance of the communication system.
Smart Images
Figure CN121769504A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of communication technology, and more specifically, to a bandpass phase shifter and antenna device. Background Technology
[0002] Phase shifters, as crucial components in communication systems, adjust the phase of electromagnetic waves, playing an indispensable role in systems such as phased arrays and beamforming. With advancements in communication technology, miniaturized, high-performance radio frequency microwave devices have also developed rapidly. However, the filtering and phase-shifting sections of the communication system front-end occupy a significant area. Therefore, designing miniaturized microwave devices that simultaneously provide filtering and phase-shifting effects is of profound significance for reducing the size of communication systems and ensuring system performance.
[0003] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention
[0004] The purpose of this disclosure is to provide a bandpass phase shifter and antenna device that can achieve miniaturization of the bandpass phase shifter while ensuring filtering and phase shifting effects.
[0005] According to one aspect of this disclosure, a bandpass phase shifter is provided, comprising:
[0006] First dielectric substrate;
[0007] The first metal layer is located on one side of the first dielectric substrate;
[0008] The second dielectric substrate is located on the side of the first metal layer that is away from the first dielectric substrate;
[0009] The second metal layer is located on the side of the second dielectric substrate close to the first metal layer and includes a filter transmission line. The filter transmission line includes a pair of dual composite transmission lines spaced apart along a first direction. The dual composite transmission line includes interdigitated capacitors and electrical transmission lines. The two ends of the electrical transmission lines are respectively connected to the same side ends of a pair of capacitor main lines on the interdigitated capacitors, and a coupling feed is formed between the electrical transmission lines included in the pair of dual composite transmission lines.
[0010] A dielectric functional layer is located between the first metal layer and the second metal layer.
[0011] According to any of the bandpass phase shifters described in this disclosure, the dual composite transmission line includes a first dual composite transmission line and a second dual composite transmission line.
[0012] Both the first and second paired composite transmission lines include interdigitated capacitors and electrical transmission lines. The first and second paired composite transmission lines are distributed along the second direction and are staggered in the first direction. The first direction is perpendicular to the second direction.
[0013] The first and second paired composite transmission lines each include two interdigitated capacitors that share the same capacitor main line. The electrical transmission lines included in the first and second paired composite transmission lines are arranged on the same side and connected in the same line.
[0014] According to any of the bandpass phase shifters described in this disclosure, the interdigitated capacitors include multiple pairs of capacitor branches located between a pair of said capacitor mainlines;
[0015] In the at least one interdigitated capacitor included in the dual composite transmission line, the width of at least a portion of the capacitor branches gradually decreases in the direction away from the connected capacitor main line.
[0016] According to any of the bandpass phase shifters described in this disclosure, at least a portion of the capacitor branches in at least one of the interdigitated capacitors has a triangular structure.
[0017] According to any of the bandpass phase shifters described in this disclosure, the interdigitated capacitor includes multiple pairs of capacitor branches located between a pair of capacitor main lines, and each pair of capacitor branches includes a first branch and a second branch respectively connected to two of the capacitor main lines;
[0018] In the at least one interdigitated capacitor included in the dual composite transmission line, the width of the plurality of first stubs and / or the width of the plurality of second stubs decreases in the direction away from the electrical transmission line.
[0019] According to any of the bandpass phase shifters described in this disclosure, the interdigitated capacitors include multiple pairs of capacitor stubs located between a pair of said capacitor mainlines, and at least a portion of the capacitor stubs in at least one interdigitated capacitor included in the dual composite transmission line are curved line structures.
[0020] According to any of the bandpass phase shifters described in this disclosure, the multiple pairs of capacitor branches of the interdigitated capacitor include a plurality of third branches located near the electrical transmission line and at least one fourth branch located away from the electrical transmission line, wherein the plurality of third branches are curved line structures and the at least one fourth branch is a straight line structure.
[0021] According to any of the bandpass phase shifters described in this disclosure, the interdigitated capacitor includes multiple pairs of capacitor branches located between a pair of capacitor main lines, and each pair of capacitor branches includes a first branch and a second branch respectively connected to two of the capacitor main lines;
[0022] In the at least one interdigitated capacitor included in the dual composite transmission line, the lengths of the plurality of first stubs and / or the lengths of the plurality of second stubs are not all the same.
[0023] According to any of the bandpass phase shifters described in this disclosure, the number of first branches is odd, and the plurality of first branches includes a middle branch located in the middle and a plurality of outer branches located on both sides of the middle branch, the plurality of outer branches having equal lengths, and the length of the middle branch being less than or equal to half the length of the outer branches.
[0024] According to any of the bandpass phase shifters described in this disclosure, the number of first branches is odd, and the plurality of first branches includes a middle branch located in the middle and a plurality of outer branches located on both sides of the middle branch, the plurality of outer branches having equal lengths, and the length of the middle branch being greater than or equal to the length of the outer branches.
[0025] According to any of the bandpass phase shifters described in this disclosure, the widths of the plurality of outer branches are equal, and the width of the middle branch is smaller than the width of the outer branches.
[0026] According to one aspect of this disclosure, an antenna device is provided, including the bandpass phase shifter described in the above aspect.
[0027] The embodiments disclosed herein include at least the following technical effects:
[0028] In this embodiment, for the dual composite transmission line included in the filtering transmission line, a certain bandwidth filtering characteristic can be achieved by coupling a pair of dual composite transmission lines based on the band-stop characteristics of the dual composite transmission line. At the same time, based on the setting of the dielectric functional layer, the phase of the electromagnetic wave can be adjusted by adjusting the dielectric constant of the dielectric functional layer. In this way, the miniaturization design of the bandpass phase shifter is achieved while ensuring the phase shifting and filtering characteristics of the bandpass phase shifter. In addition, when adjusting the dielectric constant of the dielectric functional layer, the dual composite transmission lines have different resonant frequencies. Therefore, based on the adjustment of the dielectric constant, the filtering bandwidth of the bandpass phase shifter can be adjusted, thereby facilitating the reduction of the number of bandpass phase shifters.
[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description
[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.
[0031] Figure 1 This is a cross-sectional structural diagram of a bandpass phase shifter provided for an embodiment of this disclosure.
[0032] Figure 2 This is a schematic diagram of a filtered transmission line provided for an embodiment of the present disclosure.
[0033] Figure 3 A phase shift curve of a bandpass phase shifter is provided for an embodiment of this disclosure.
[0034] Figure 4 for Figure 2 The diagram shows the equivalent circuit of the dual composite transmission line in the filtered transmission line.
[0035] Figure 5 for Figure 2 The simulated S-parameter curves of the dual composite transmission line in the filtered transmission line are shown.
[0036] Figure 6 This is a schematic diagram of another filtered transmission line provided in an embodiment of the present disclosure.
[0037] Figure 7 This is a schematic diagram of another filtered transmission line provided in this embodiment of the present disclosure.
[0038] Figure 8 This is a schematic diagram of another filtered transmission line provided in this embodiment of the present disclosure.
[0039] Figure 9 This is a schematic diagram of another filtered transmission line provided in this embodiment of the present disclosure.
[0040] Figure 10 This is a schematic diagram of another filtered transmission line provided in this embodiment of the present disclosure.
[0041] Figure 11 This is a schematic diagram of another filtered transmission line provided in this embodiment of the present disclosure.
[0042] Figure 12 This is a schematic diagram of another filtered transmission line provided in this embodiment of the present disclosure.
[0043] Figure 13 This is a schematic diagram of another filtered transmission line provided in this embodiment of the present disclosure.
[0044] Figure 14 This is a schematic diagram of another filtered transmission line provided in this embodiment of the present disclosure.
[0045] Figure 15 This is a schematic diagram of another filtered transmission line provided in this embodiment of the present disclosure.
[0046] Figure 16 This is a schematic diagram of another filtered transmission line provided in this embodiment of the present disclosure.
[0047] Figure 17 This is a schematic diagram of another filtered transmission line provided in this embodiment of the present disclosure.
[0048] Figure 18 This is a schematic diagram of another filtered transmission line provided in this embodiment of the present disclosure.
[0049] Figure 19 for Figure 18 The reflection coefficient curve of the bandpass phase shifter corresponding to the filtered transmission line is shown.
[0050] Figure label:
[0051] 10. Bandpass phase shifter;
[0052] 1. First dielectric substrate; 2. First metal layer; 3. Second dielectric substrate; 4. Second metal layer; 5. Dielectric functional layer;
[0053] 41. Filtered transmission line; 42. Dual composite transmission line; 43. First dual composite transmission line; 44. Second dual composite transmission line; 45. Parallel resonance; 46. Series resonance;
[0054] 421. Interdigitated capacitor; 422. Electrical transmission line; 423. Capacitor main line; 424. Capacitor branch; 425. First branch; 426. Second branch; 427. Third branch; 428. Fourth branch. Detailed Implementation
[0055] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.
[0056] Although relative terms such as "up" and "down" are used in this specification to describe the relative relationship of one component of an icon to another, these terms are used only for convenience, such as according to the orientation of the examples shown in the accompanying drawings. It is understood that if the device of the icon is flipped upside down, the component described as "up" will become the component described as "down." When a structure is "up" of another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" mounted on the other structure, or that the structure is "indirectly" mounted on the other structure through another structure.
[0057] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” and “third,” etc., are used only as markers and are not a limitation on the number of objects.
[0058] Figure 1 A cross-sectional view of a bandpass phase shifter 10 provided in this disclosure is illustrated. Figure 2 A top view of a second metal layer 4 provided in an embodiment of this disclosure is illustrated. Figure 1 and Figure 2 As shown, the bandpass phase shifter 10 includes: a first dielectric substrate 1; a first metal layer 2 located on one side of the first dielectric substrate 1; a second dielectric substrate 3 located on the side of the first metal layer 2 away from the first dielectric substrate 1; a second metal layer 4 located on the side of the second dielectric substrate 3 close to the first metal layer 2; a dielectric functional layer 5 located between the first metal layer 2 and the second metal layer 4; the second metal layer 4 includes a filter transmission line 41, the filter transmission line 41 including a pair of dual composite transmission lines 42 spaced apart along a first direction, and the pair of dual composite transmission lines 42 form a coupled feed.
[0059] In this embodiment, the dual composite transmission line 42 included in the filter transmission line 41 can achieve a certain bandwidth filtering characteristic by coupling a pair of dual composite transmission lines 42 based on their band-stop characteristics. Simultaneously, based on the dielectric functional layer 5, the phase of the electromagnetic wave can be adjusted by changing the dielectric constant of the dielectric functional layer 5. Thus, while achieving a miniaturized design of the bandpass phase shifter 10, the phase shifting and filtering characteristics of the bandpass phase shifter 10 are guaranteed. Furthermore, when adjusting the dielectric constant of the dielectric functional layer 5, the dual composite transmission lines 42 have different resonant frequencies. Therefore, based on the adjustment of the dielectric constant, the filtering bandwidth of the bandpass phase shifter 10 can be adjusted, thereby facilitating a reduction in the number of bandpass phase shifters 10.
[0060] The first dielectric substrate 1 and the second dielectric substrate 3 can be flexible substrates such as polytetrafluoroethylene glass fiber laminate, phenolic paper laminate, and phenolic glass cloth laminate, or rigid substrate materials such as quartz, high-temperature glass, and ordinary glass. A frame is provided between the first dielectric substrate 1 and the second dielectric substrate 3, or between the first metal layer 2 and the second dielectric substrate 3, to form a cavity for accommodating the dielectric functional layer 5. Additionally, spacers can be provided between the first dielectric substrate 1 and the second dielectric substrate 3, or between the first metal layer 2 and the second dielectric substrate 3, to provide better support for the cavity.
[0061] In this design, the dielectric constant of the dielectric functional layer 5 changes after being affected by an electric field, thereby shifting the phase of the electromagnetic wave transmitted on the second metal layer 4. The material of the dielectric functional layer 5 can be chosen by those skilled in the art according to actual conditions, and is not limited here. For example, the dielectric functional layer 5 may include an electrodielectrically variable material, such as liquid crystal or graphene. The material of the dielectric functional layer 5 can be selected according to the required dielectric constant; for example, the material of the dielectric functional layer 5 is LC446 liquid crystal. Since the dielectric constant of the dielectric functional layer 5 is adjustable, and electromagnetic simulation is performed on the bandpass phase shifter 10 before and after adjusting the dielectric constant of the dielectric functional layer 5, the following results are obtained: Figure 3 The phase shift curves ε1 and ε2 of the filtered transmission line 41 are shown. Combined with... Figure 3 It can be seen that by adjusting the dielectric constant of the dielectric functional layer 5, the filter transmission line 41 can have different phase shifts.
[0062] The first metal layer 2 can be a grounded metal layer to achieve relative grounding of the second metal layer 4. The filter transmission line 41 of the second grounded layer is used to transmit electromagnetic waves and has ports 1 and 2 to connect to the feed end (such as a power divider) and the output end (such as a radiating patch) respectively to realize the transmission of electromagnetic waves. The materials of the first metal layer 2 and the second metal layer 4 can be set by those skilled in the art according to the actual situation, and are not limited here. For example, the materials of the first metal layer 2 and the second metal layer 4 may include copper (Cu), silver (Ag), gold (Au), or alloys containing the aforementioned materials, etc., which are low-resistance and low-loss materials. In addition, the first metal layer 2 and the second metal layer 4 are also used to apply a bias voltage to change the dielectric constant of the dielectric functional layer 5.
[0063] The dual composite transmission line 42 includes an interdigital capacitor 421 and an electrical transmission line 422. Both ends of the electrical transmission line 422 are connected to the same side ends of a pair of capacitor main lines 423 on the interdigital capacitor 421, and a coupled feed is formed between the electrical transmission lines 422 included in the pair of dual composite transmission lines 42. Specifically, as shown... Figure 2As shown, the interdigitated capacitor 421 includes a pair of capacitor main lines 423 distributed opposite each other in the second direction, and multiple pairs of capacitor branches 424 distributed in the first direction between the pair of capacitor main lines 423. Each pair of capacitor branches 424 includes a first branch 425 and a second branch 426, and different ends of the first branch 425 and the second branch 426 are respectively connected to the pair of capacitor main lines 423 in the second direction. The two ends of the electrical transmission line 422 are respectively connected to the same side ends of the pair of capacitor main lines 423, and the electrical transmission lines 422 included in the pair of dual composite transmission lines 42 are arranged adjacent to each other to form a coupled power supply.
[0064] For a dual composite transmission line 42 consisting of an interdigitated capacitor 421 and an electrical transmission line 422, its corresponding equivalent circuit is as follows: Figure 4 As shown, the equivalent circuit includes a set of parallel resonators 45 and two sets of series resonators 46. The two sets of series resonators 46 are connected in parallel across the two ends of the parallel resonator 45. The parallel resonator 45 includes a left-handed capacitor CL and a right-handed inductor LR connected in parallel. The left-handed capacitor CL represents the capacitance value of the interdigital capacitor 421, and the right-handed inductor LR represents the inductance value of the electrical transmission line 422. The series resonator 46 includes a right-handed capacitor CR and a left-handed inductor LL connected in series. The right-handed capacitor CR represents the capacitance value between the dual composite transmission line 42 and the first metal layer 2, and the left-handed inductor LL represents the inductance value of the induced current between the dual composite transmission line 42 and the first metal layer 2.
[0065] From the calculation formulas for the resonant frequencies of series resonance 46 and parallel resonance 45, it can be seen that when the values of the left-hand capacitor CL and the right-hand capacitor CR are equal, and the values of the left-hand inductor LL and the right-hand inductor LR are equal, the resonant frequencies of series resonance 46 and parallel resonance 45 are equal. In this case, the dual composite transmission line 42 can be used as a resonator. However, after increasing the values of the left-hand capacitor CL and the right-hand inductor LR, and decreasing the values of the right-hand capacitor CR and the left-hand inductor LL, electromagnetic simulation of the dual composite transmission line 42 yields the following results: Figure 5 The S-parameter curve shown, combined with Figure 5 It can be seen that the resonant frequency f1 of the series resonance 46 increases, while the resonant frequency f2 of the parallel resonance 45 decreases, thereby widening the gap between the two resonant frequencies of the dual composite transmission line 42 to form a wide stopband transmission line. Thus, for the filter transmission line 41 composed of a pair of dual composite transmission lines 42, a wide bandwidth filtering characteristic can be achieved.
[0066] In this embodiment of the disclosure, when filtering is performed through the filtering transmission line 41, it can be single-band filtering, that is, filtering can only be performed on electromagnetic waves in one frequency band, or it can be dual-band filtering, that is, filtering can be performed on electromagnetic waves in two different frequency bands.
[0067] In some implementations, when the filter transmission line 41 is a single-band filter, such as Figure 2 As shown, the dual composite transmission line 42 includes only one electrical transmission line 422 and one interdigital capacitor 421.
[0068] Among them, the electrical transmission line 422 and the capacitor stub 424 are both transmission lines with a certain width. The electrical transmission line 422 can be a straight structure to ensure the coupling effect between the two electrical transmission lines 422 included in a pair of dual composite transmission lines 42.
[0069] The capacitor stub 424 can be a transmission line with a uniform width or a transmission line with a gradually changing width. The width and length of multiple capacitor stubs 424 can be equal or unequal. For example, the widths of the first stub 425 and the second stub 426 are not equal, or the widths of multiple first stubs 425 are not equal. In addition, the capacitor stub 424 can be a straight structure or a curved line structure, etc. For details, please refer to the following embodiments.
[0070] Optionally, for the multiple pairs of capacitor branches 424 included in the interdigitated capacitor 421, the width of at least some of the capacitor branches 424 may gradually decrease in the direction away from the connected capacitor main line 423. This arrangement facilitates enhanced resonance between each pair of capacitor branches 424, thereby improving the quality factor of the dual composite transmission line 42 to ensure the matching of ports 1 and 2 of the bandpass phase shifter 10 when connected to the feed terminal and feedout terminal, respectively, thus ensuring the selectivity of the bandpass phase shifter 10.
[0071] This can be achieved by the width of each first branch 425 in the multiple pairs of capacitor branches 424 gradually decreasing in width away from the connected capacitor main line 423, or by the width of each second branch 426 in the multiple pairs of capacitor branches 424 gradually decreasing in width away from the connected capacitor main line 423, or by other means... Figure 6 As shown, the width of each first branch 425 and the width of each second branch 426 in the multiple pairs of capacitor branches 424 gradually decrease in the direction away from the connected capacitor main line 423, that is, the width of each capacitor branch 424 in the multiple pairs of capacitor branches 424 gradually decreases in the direction away from the connected capacitor main line 423.
[0072] Furthermore, for the design of decreasing width of capacitor stub 424, at least a portion of the capacitor stub 424 with decreasing width can be a trapezoidal structure (such as an isosceles trapezoid or a right trapezoid), or a triangular structure (such as a right triangle or an isosceles triangle), etc. For example, such as... Figure 6 As shown, the first branch 425 and the second branch 426 in the multiple pairs of capacitor branches 424 are both triangular structures, that is, each capacitor branch 424 in the multiple pairs of capacitor branches 424 is a triangular structure.
[0073] Optionally, for the multiple pairs of capacitor branches 424 included in the interdigital capacitor 421, the width of the multiple first branches 425 and / or the width of the multiple second branches 426 may decrease in the direction away from the electrical transmission line 422.
[0074] This configuration reduces the capacitance between the dual composite transmission line 42 and the first metal layer 2, and simultaneously reduces the inductance of the induced current between the dual composite transmission line 42 and the first metal layer 2. This reduces the right-hand capacitance CR and the left-hand inductance LL, thereby increasing the resonant frequency f1 of the series resonance 46. This further widens the difference between the resonant frequencies of the series resonance 46 and the parallel resonance 45, thus further widening the stopband of the dual composite transmission line 42. Consequently, this further increases the filtering bandwidth of the filter transmission line 41 and improves the operating bandwidth of the bandpass phase shifter 10.
[0075] This can be achieved by the width of multiple first branches 425 in multiple pairs of capacitor branches 424 decreasing in the direction away from the electrical transmission line 422, or by the width of multiple second branches 426 in multiple pairs of capacitor branches 424 decreasing in the direction away from the electrical transmission line 422, or by other means... Figure 7 As shown, the widths of the multiple first branches 425 and the multiple second branches 426 in the multiple pairs of capacitor branches 424 decrease in the direction away from the electrical transmission line 422.
[0076] Optionally, for the multiple pairs of capacitor branches 424 included in the interdigital capacitor 421, such as Figure 8 As shown, at least some of the capacitor branches 424 in the multiple pairs of capacitor branches 424 are curved line structures.
[0077] Thus, by using the curved line structure of the capacitor stub 424, the size of the capacitor stub 424 in the second direction can be shortened to achieve the miniaturization design of the dual composite transmission line 42. It can also increase the relative area between each pair of capacitor stubs 424, thereby increasing the capacitance value of the interdigital capacitor 421, that is, reducing the resonant frequency f2 of the parallel resonance 45, so as to further widen the difference between the resonant frequencies of the series resonance 46 and the parallel resonance 45, that is, to further widen the stopband of the dual composite transmission line 42, thereby further increasing the filtering bandwidth of the filter transmission line 41 and improving the operating bandwidth of the bandpass phase shifter 10.
[0078] In this case, multiple first branches 425 in multiple pairs of capacitor branches 424 can be curved line structures, multiple second branches 426 in multiple pairs of capacitor branches 424 can be curved line structures, or multiple first branches 425 and multiple second branches 426 in multiple pairs of capacitor branches 424 can be curved line structures.
[0079] Of course, for the curved line structure of capacitor stub 424, in addition to classifying and designing according to the first stub 425 and the second stub 426, it can also be classified and designed according to the number of pairs of capacitor stubs 424. Taking the classification and design according to the number of pairs of capacitor stubs 424 as an example, at least one pair of capacitor stubs 424 in multiple pairs of capacitor stubs 424 are curved line structures.
[0080] For example, such as Figure 8 As shown, the multiple pairs of capacitor branches 424 include multiple third branches 427 located near the electrical transmission line 422 and at least one fourth branch 428 located away from the electrical transmission line 422. The multiple third branches 427 are all curved line structures, and the at least one fourth branch 428 is a straight line structure.
[0081] Optionally, for the multiple pairs of capacitor branches 424 included in the interdigital capacitor 421, the lengths of the multiple first branches 425 and / or the lengths of the multiple second branches 426 are not all the same. In this way, by adjusting the lengths of the multiple first branches 425 and the multiple second branches 426, the resonance of each pair of capacitor branches 424 is enhanced, thereby ensuring the stopband width of the dual composite transmission line 42 at different stopbands. Thus, for a pair of dual composite transmission lines 42, the bandpass phase shifter 10 is effectively guaranteed to have a wide filtering bandwidth at different filtering frequency bands.
[0082] Next, taking the first branch 425 as an example, for instance, as shown... Figure 9 As shown, the number of first branches 425 in the multiple pairs of capacitor branches 424 is odd. The multiple first branches 425 include a central branch located in the middle, and multiple outer branches located on both sides of the central branch. The lengths of the multiple outer branches are equal, and the length of the central branch is less than or equal to half the length of the outer branches; or as shown... Figure 10 As shown, the number of first branches 425 in the multiple pairs of capacitor branches 424 is odd. The multiple first branches 425 include the middle branch located in the middle and multiple outer branches located on both sides of the middle branch. The lengths of the multiple outer branches are equal, and the length of the middle branch is greater than or equal to the length of the outer branches.
[0083] Furthermore, the widths of the outer stubs are equal, and the width of the middle stub is smaller than that of the outer stubs. Thus, based on adjusting the length of the middle stub, the width of the middle stub is further adjusted to further enhance the resonance of the pair of capacitor stubs 424 corresponding to the middle stub, thereby ensuring the stopband width of the dual composite transmission line 42 when corresponding to different stopbands.
[0084] It should be noted that the specific structure of the capacitor branch 424 can be the structure described in any of the above embodiments, or it can be a structure combining multiple embodiments. This disclosure does not limit this aspect. In addition, the pair of dual composite transmission lines 42 included in the filter transmission line 41 has a symmetrical structure in the first direction. Thus, the structures of the interdigital capacitors 421 included in the pair of dual composite transmission lines 42 are completely identical. The above embodiments are only explained using the interdigital capacitors 421 included in one dual composite transmission line 42 as an example.
[0085] In other embodiments, the filter transmission line 41 is a dual-band filter, such as... Figure 11 As shown, the dual composite transmission line 42 includes a first dual composite transmission line 43 and a second dual composite transmission line 44. Both the first dual composite transmission line 43 and the second dual composite transmission line 44 include interdigitated capacitors 421 and electrical transmission lines 422.
[0086] like Figure 11 As shown, the first paired composite transmission line 43 and the second paired composite transmission line 44 are distributed along the second direction and are staggered in the first direction, with the first direction being perpendicular to the second direction; the two interdigitated capacitors 421 included in the first paired composite transmission line 43 and the second paired composite transmission line 44 share the same capacitor main line 423, and the electrical transmission lines 422 included in the first paired composite transmission line 43 and the electrical transmission lines 422 included in the second paired composite transmission line 44 are arranged on the same side and connected in the same line.
[0087] The structures of the first paired composite transmission line 43 and the second paired composite transmission line 44 can both refer to the structure of the paired composite transmission line 42 described in the above embodiments. The difference lies in the structural parameters of the interdigital capacitors 421 included in the first paired composite transmission line 43 and the second paired composite transmission line 44. For example, the lengths and widths of the capacitor branches 424 included in the two interdigital capacitors 421 are different, or the spacing of the capacitor branches 424 is different, so as to enable the first paired composite transmission line 43 and the second paired composite transmission line 44 to form stopbands of different frequency bands, and thus form filtering effects of different frequency bands based on the setting of a pair of paired composite transmission lines 42.
[0088] Optionally, in at least one interdigitated capacitor 421 included in the dual composite transmission line 42, the width of at least a portion of the capacitor stubs 424 gradually decreases in the direction away from the connected capacitor main line 423. For example, as... Figure 12 As shown, in the interdigitated capacitors 421 of the second dual composite transmission line 44, the width of each first branch 425 and the width of each second branch 426 in the multiple pairs of capacitor branches 424 gradually decrease in the direction away from the connected capacitor main line 423; or as... Figure 13As shown, in the interdigitated capacitors 421 of the first pair of composite transmission lines 43 and the second pair of composite transmission lines 44, the width of each first branch 425 and the width of each second branch 426 in the multiple pairs of capacitor branches 424 gradually decrease in the direction away from the connected capacitor main line 423.
[0089] Furthermore, at least a portion of the capacitor branches 424 in at least one interdigitated capacitor 421 has a triangular structure. For example, as... Figure 12 As shown, in the interdigitated capacitors 421 of the second dual composite transmission line 44, each first branch 425 and each second branch 426 in the multiple pairs of capacitor branches 424 is a triangular structure (isosceles triangle); or as... Figure 13 As shown, in the interdigitated capacitors 421 of the first dual composite transmission line 43 and the second dual composite transmission line 44, each first branch 425 and each second branch 426 in the multiple pairs of capacitor branches 424 are triangular structures (isosceles triangles).
[0090] Optionally, in at least one interdigitated capacitor 421 included in the dual composite transmission line 42, the widths of the plurality of first stubs 425 and / or the widths of the plurality of second stubs 426 decrease in the direction away from the electrical transmission line 422. For example, as... Figure 14 As shown, in the multiple capacitor branches 424 of the first dual composite transmission line 43 and the multiple capacitor branches 424 of the second dual composite transmission line 44, the widths of the multiple first branches 425 and the widths of the multiple second branches 426 decrease in the direction away from the electrical transmission line 422.
[0091] Optionally, at least a portion of the capacitor branches 424 in at least one interdigitated capacitor 421 included in the dual composite transmission line 42 are bent-line structures. For example, as... Figure 15 As shown, some of the capacitor branches 424 in the multiple pairs of capacitor branches 424 of the second dual composite transmission line 44 are curved line structures; or as shown in the figure. Figure 16 As shown, some of the capacitor branches 424 in the multiple capacitor branches 424 of the first dual composite transmission line 43 and some of the capacitor branches 424 in the multiple capacitor branches 424 of the second dual composite transmission line 44 are curved line structures.
[0092] Furthermore, the interdigitated capacitor 421 includes multiple pairs of capacitor branches 424, each located near the electrical transmission line 422, and at least one fourth branch 428 located away from the electrical transmission line 422. The multiple third branches 427 are all curved line structures, and the at least one fourth branch 428 is a straight line structure. For example, as... Figure 15As shown, the interdigitated capacitor 421 of the second dual composite transmission line 44 includes three pairs of capacitor branches 424, and the three pairs of capacitor branches 424 include five third branches 427 located on the side closer to the electrical transmission line 422 and one fourth branch 428 located on the side farther from the electrical transmission line 422. The five third branches 427 are all curved line structures, and the one fourth branch 428 is a straight line structure; or as shown Figure 16 As shown, the interdigital capacitors 421 of the first dual composite transmission line 43 and the second dual composite transmission line 44 each include three pairs of capacitor branches 424, and each interdigital capacitor 421 includes five third branches 427 located on the side closer to the electrical transmission line 422 and one fourth branch 428 located on the side away from the electrical transmission line 422. The five third branches 427 are all curved line structures, and the one fourth branch 428 is a straight line structure.
[0093] Optionally, in at least one interdigitated capacitor 421 included in the dual composite transmission line 42, the lengths of the plurality of first stubs 425 and / or the lengths of the plurality of second stubs 426 are not all the same.
[0094] For example, such as Figure 17 As shown, the number of first branches 425 is odd (the illustration shows three first branches 425). The multiple first branches 425 include the middle branch located in the middle and multiple outer branches located on both sides of the middle branch. The multiple outer branches are of equal length, and the length of the middle branch is less than or equal to half the length of the outer branches.
[0095] For example, such as Figure 18 As shown, the number of first branches 425 is odd (the illustration shows three first branches 425). The multiple first branches 425 include the middle branch located in the middle, and multiple outer branches located on both sides of the middle branch. The multiple outer branches are of equal length, and the length of the middle branch is greater than or equal to the length of the outer branches.
[0096] Furthermore, the widths of the outer branches are equal, and the width of the middle branches is smaller than that of the outer branches.
[0097] In some implementations, for the filtered transmission line 41, such as Figure 18 The bandpass phase shifter 10 shown was simulated, and the results are as follows: Figure 19 The reflection coefficient curve S11 shown is combined with Figure 19 It can be seen that the bandpass filter has an operating bandwidth of 10-14 GHz.
[0098] This disclosure also provides an antenna device including the bandpass phase shifter 10 described in the above embodiments. In conjunction with the above embodiments, the antenna device using the bandpass phase shifter 10, based on the phase shifting and filtering characteristics of the bandpass phase shifter 10 and its miniaturized design, facilitates ensuring the antenna performance of the antenna device while improving its space utilization. Furthermore, by reducing the number of bandpass phase shifters 10, the structure of the antenna device is simplified, while also improving space utilization.
[0099] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.
Claims
1. A bandpass phase shifter, characterized by, The application relates to a filter transmission line, which comprises: a first dielectric substrate; a first metal layer on one side of the first dielectric substrate; a second dielectric substrate on the side of the first metal layer away from the first dielectric substrate; a second metal layer on the side of the second dielectric substrate close to the first metal layer, and comprising a filter transmission line, the filter transmission line comprising a pair of dual composite transmission lines spaced apart along a first direction, the dual composite transmission line comprising a finger capacitor and an electric transmission line, the two ends of the electric transmission line being connected to the same side of a pair of capacitor main lines on the finger capacitor, and a pair of the dual composite transmission lines comprising a coupling feed between the electric transmission lines; a dielectric functional layer between the first metal layer and the second metal layer.
2. The bandpass phase shifter of claim 1, wherein, The dual composite transmission line comprises a first dual composite transmission line and a second dual composite transmission line. The first dual composite transmission line and the second dual composite transmission line each comprise a finger capacitor and an electric transmission line, the first dual composite transmission line and the second dual composite transmission line are distributed along a second direction and are staggered in the first direction, and the first direction is perpendicular to the second direction. The two finger capacitors in the first dual composite transmission line and the second dual composite transmission line share the same capacitor main line, and the electric transmission line in the first dual composite transmission line is arranged on the same line with the electric transmission line in the second dual composite transmission line and is connected in the same line.
3. The bandpass phase shifter of claim 2, wherein, The finger capacitor comprises a plurality of pairs of capacitor branches between a pair of capacitor main lines. In at least one of the finger capacitors in the dual composite transmission line, the width of at least part of the capacitor branches gradually decreases in the direction away from the connected capacitor main line.
4. The bandpass phase shifter of claim 3, wherein, At least part of the capacitor branches in at least one of the finger capacitors are triangular structures.
5. The bandpass phase shifter of claim 2, wherein, The finger capacitor comprises a plurality of pairs of capacitor branches between a pair of capacitor main lines, and each pair of capacitor branches comprises a first branch and a second branch connected to two capacitor main lines respectively. In at least one of the finger capacitors in the dual composite transmission line, the width of a plurality of the first branches and / or the width of a plurality of the second branches decreases in the direction away from the electric transmission line.
6. The bandpass phase shifter of claim 2, wherein, The finger capacitor comprises a plurality of pairs of capacitor branches between a pair of capacitor main lines, and at least part of the capacitor branches in at least one of the finger capacitors in the dual composite transmission line are curved line structures.
7. The bandpass phase shifter of claim 6, wherein, The plurality of pairs of capacitor branches of the finger capacitor comprise a plurality of third branches on the side close to the electric transmission line and at least one fourth branch away from the electric transmission line, the plurality of third branches are curved line structures, and the at least one fourth branch is a straight line structure.
8. The bandpass phase shifter of claim 2, wherein, The finger capacitor comprises a plurality of pairs of capacitor branches between a pair of capacitor main lines, and each pair of capacitor branches comprises a first branch and a second branch connected to two capacitor main lines respectively. In at least one of the finger capacitors in the dual composite transmission line, the length of a plurality of the first branches and / or the length of a plurality of the second branches are not all the same.
9. The bandpass phase shifter of claim 8, wherein, The number of the first branches is odd, the first branches include a middle branch in the middle and a plurality of outer branches on both sides of the middle branch, the lengths of the outer branches are equal, and the length of the middle branch is less than or equal to half of the length of the outer branches.
10. The bandpass phase shifter of claim 8, wherein, The number of the first branches is odd, the first branches include a middle branch in the middle and a plurality of outer branches on both sides of the middle branch, the lengths of the outer branches are equal, and the length of the middle branch is greater than or equal to the length of the outer branches.
11. The bandpass phase shifter of claim 9 or 10, wherein, The widths of the outer branches are equal, and the width of the middle branch is less than the width of the outer branches.
12. An antenna device, characterized by A bandpass phase shifter comprising any one of claims 1-11.