CN117293502A - Double-frequency balance filter based on composite left and right hands - Google Patents
Double-frequency balance filter based on composite left and right hands Download PDFInfo
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- 238000005859 coupling reaction Methods 0.000 claims description 42
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- 230000005540 biological transmission Effects 0.000 claims description 5
- 230000009977 dual effect Effects 0.000 claims description 4
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- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20336—Comb or interdigital filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application provides a double-frequency balance filter based on composite left and right hands, wherein a pair of input feeder line structures and a pair of output feeder line structures which are symmetrically arranged about a first direction and at least two composite left and right hand resonators which are symmetrically arranged about the first direction and are sequentially arranged, each composite left and right hand resonator is symmetrically arranged about a second direction, and the second direction is mutually perpendicular to the first direction; a pair of input feed line structures coupled with and gap-coupled with a first one of the at least two composite left-right-hand resonators, and a pair of output feed line structures coupled with and gap-coupled with a last one of the at least two composite left-right-hand resonators to provide electromagnetic excitation; at least two composite left-and right-hand resonators are coupled to each other to produce two frequency bands under electromagnetic excitation and for common mode frequency rejection of the two frequency bands. The double-frequency balance filter based on the composite left and right hands has a simple and miniaturized structure, and improves the suppression degree of common mode noise.
Description
Technical Field
The disclosed embodiments of the present application relate to the field of wireless communication technology, and more particularly, to a dual-band balanced filter based on composite left and right hands.
Background
The balanced circuit has a unique dual-port input/output topological structure, can effectively inhibit various environmental noises and electronic noises generated by circuit components, can solve the problem of electromagnetic interference (EMI) between communication devices, and greatly improves the signal-to-noise ratio of a receiver and the efficiency of a transmitter.
In addition, miniaturization of radio frequency front-end systems, where the miniaturization of passive circuits, particularly filters, has been a research hotspot. The metamaterial is an electromagnetic artificial uniform structure with special characteristics which are not existed in the nature, and can be used for realizing miniaturization. The composite left-right hand (CRLH) is a sub-wavelength structure as one of the metamaterials, and can be used for constructing radio frequency/microwave passive elements with ultra-compact dimensions.
Therefore, in increasingly complex electromagnetic environments, the design of a high-selectivity balance filter with strong anti-interference performance based on a composite left hand and a composite right hand has important significance. In addition, to better meet the multi-service requirements of modern wireless communication, it is important to research and design a balance filter with multiple operating frequency bands.
Disclosure of Invention
According to the embodiment of the application, the application provides a double-frequency balance filter based on a composite left hand and a composite right hand, and the problem is solved.
In accordance with aspects of the present application, an exemplary composite left-right hand based dual-band balanced filter is disclosed. The exemplary dual-frequency balanced filter includes a pair of input feed line structures and a pair of output feed line structures symmetrically disposed about a first direction and at least two composite left-right-hand resonators symmetrically disposed about the first direction and sequentially arranged, wherein each of the at least two composite left-right-hand resonators is symmetrically disposed about a second direction, the second direction being mutually perpendicular to the first direction; wherein a pair of input feed line structures are coupled with and gap-coupled with a tap of a first one of the at least two composite left-right-hand resonators, and a pair of output feed line structures are coupled with and gap-coupled with a tap of a last one of the at least two composite left-right-hand resonators to provide electromagnetic excitation; at least two composite left-and right-hand resonators are coupled to each other to produce two frequency bands under electromagnetic excitation and for common mode frequency rejection of the two frequency bands.
In some embodiments, each of the at least two composite left-right-hand resonators includes a first microstrip line and a second microstrip line disposed in parallel along a first direction, and a first interdigital structure and a second interdigital structure disposed between and at opposite ends of the first microstrip line and the second microstrip line; wherein, the first microstrip line and the second microstrip line are symmetrically arranged about the second direction; the first interdigital structure and the second interdigital structure are symmetrically arranged about the second direction, the first interdigital structure is positioned at one end of the first microstrip line and the second microstrip line, and the second interdigital structure is positioned at the other end of the first microstrip line and the second microstrip line.
In some embodiments, the first interdigital structure is a first predetermined distance from one end of the first microstrip line and a second predetermined distance from one end of the second microstrip line; the second interdigital structure is at a first preset distance from the other end of the first microstrip line and at a second preset distance from the other end of the second microstrip line; in the at least two composite left-right-hand resonators, the first preset distances of two adjacent composite left-right-hand resonators in the composite left-right-hand resonators located on any side of the symmetrical position are different, and the second preset distances are the same.
In some embodiments, the first microstrip line is subjected to a bending process, such that opposite ends of the first microstrip line are opposite; the second microstrip line is subjected to bending treatment so that opposite ends of the second microstrip line are opposite.
In some embodiments, the length of the first microstrip line subjected to bending treatment is a first length, and the length of the second microstrip line subjected to bending treatment is a second length; among the at least two composite left-right-hand resonators, the first lengths of two adjacent composite left-right-hand resonators in the composite left-right-hand resonators located on either side of the symmetrical position are different, and the second lengths are the same.
In some embodiments, the first interdigital structure and the second interdigital structure each include a plurality of pairs of fingers, wherein the plurality of pairs of fingers include a plurality of first fingers connected to the first microstrip line and a plurality of second fingers connected to the second microstrip line, the plurality of first fingers and the plurality of second fingers being alternately arranged at equal intervals.
In some embodiments, the dual band balanced filter further comprises a first cross line and a second cross line symmetrically disposed about the second direction, wherein the first cross line and the second cross line are coupled with the first composite left-right-hand resonator and the last composite left-right-hand resonator, respectively, to produce transmission zeroes located on both sides of the two bands.
In some embodiments, the pair of input feed line structures includes a first input feed line and a second input feed line symmetrically disposed about the second direction, and the pair of output feed line structures includes a first output feed line and a second output feed line symmetrically disposed about the second direction; the first input feeder line and the first output feeder line are symmetrically arranged about a first direction, and the second input feeder line and the second output feeder line are symmetrically arranged about the first direction.
In some embodiments, each of the first input feed line, the second input feed line, the first output feed line, and the second output feed line includes a feeding portion, a first coupling portion, and a second coupling portion connected in sequence, wherein the feeding portion and the second coupling portion are located at both sides of the first coupling portion and perpendicular to the first coupling portion, the feeding portion serves as an input/output port, the first coupling portion is used to achieve slot coupling, and the second coupling portion is used to achieve tap coupling.
In some embodiments, the at least two composite left-right-hand resonators include a first composite left-right-hand resonator and a fourth composite left-right-hand resonator symmetrically disposed about the first direction and a second composite left-right-hand resonator and a third composite left-right-hand resonator symmetrically disposed about the first direction; the first composite left-right-hand resonator is a first composite left-right-hand resonator of the at least two composite left-right-hand resonators, and the fourth composite left-right-hand resonator is a last composite left-right-hand resonator of the at least two composite left-right-hand resonators; the gap between the first composite left-right-hand resonator and the second composite left-right-hand resonator and the gap between the third composite left-right-hand resonator and the fourth composite left-right-hand resonator are both first gaps, and the gap between the second composite left-right-hand resonator and the third composite left-right-hand resonator is a second gap; the first gap is used for gap coupling between the first composite left-right-hand resonator and the second composite left-right-hand resonator and gap coupling between the third composite left-right-hand resonator and the fourth composite left-right-hand resonator, and the second gap is used for gap coupling between the second composite left-right-hand resonator and the third composite left-right-hand resonator; wherein the first gap is smaller than the second gap.
These and other objects of the present application will no doubt become obvious to those of ordinary skill in the art after having read the following detailed description of the preferred embodiments which are illustrated in the various drawing figures and drawings.
Drawings
Fig. 1 is a schematic structural diagram of a dual-band balanced filter based on a composite left-right hand according to an embodiment of the present application.
Fig. 2 is a differential mode equivalent circuit diagram of a composite right-and-left-handed resonator according to an embodiment of the present application.
Fig. 3 is a common mode equivalent circuit diagram of a composite right-and-left-handed resonator according to an embodiment of the present application.
Fig. 4 is a graph of scattering parameters for a dual-band balanced filter based on composite left and right hands according to an embodiment of the present application.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. As will be appreciated by those skilled in the art, electronic device manufacturers may refer to a component by different names. The components are not distinguished by name herein, but rather by function. In the following description and claims, the terms "include" and "comprise" are defined as open-ended terms, and thus should be interpreted to mean "include, but not limited to …". In addition, the term "coupled" is intended to mean either an indirect electrical connection or a direct electrical connection. Thus, when one device is coupled to another device, then the connection may be a direct electrical connection or an indirect electrical connection via other devices and connections.
Fig. 1 is a schematic structural diagram of a dual-band balanced filter based on a composite left-right hand according to an embodiment of the present application. The dual-band balanced filter 100 includes a pair of input feed line structures 110 and a pair of output feed line structures 120 symmetrically arranged about a first direction x and at least two complex left-right-hand resonators symmetrically arranged about the first direction x and sequentially arranged, for example, includes 4 complex left-right-hand resonators symmetrically arranged about the first direction x, namely, a first complex left-right-hand resonator 130a, a second complex left-right-hand resonator 130b, a third complex left-right-hand resonator 130c and a fourth complex left-right-hand resonator 130d, wherein the first complex left-right-hand resonator 130a and the second complex left-right-hand resonator 130b are symmetrically arranged about the first direction x with the third complex left-right-hand resonator 130c and the fourth complex left-right-hand resonator 130d.
Each of the at least two composite left-right-hand resonators is symmetrically arranged about a second direction y, which is mutually perpendicular to the first direction x. For example, in an example in which the at least two composite right-left-hand resonators include 4 composite right-hand resonators, the first composite right-hand resonator 130a, the second composite right-hand resonator 130b, the third composite right-hand resonator 130c, and the fourth composite right-hand resonator 130d are each symmetrically disposed about the second direction y.
The symmetrical arrangement of the pair of input feed line structures 110 and the pair of output feed line structures 120 and the at least two composite left-right hand resonators with respect to the first direction x may be arranged according to practical circuit design considerations. In this embodiment, the pair of input feeder structures 110, the pair of output feeder structures 120 and at least two composite left-right-hand resonators are vertically and symmetrically arranged, i.e. the first direction x is a vertical direction, and correspondingly, each of the composite left-right-hand resonators is horizontally and symmetrically arranged, i.e. the second direction y is a horizontal direction. In other embodiments, the pair of input feeder structures 110 and the pair of output feeder structures 120 and the at least two composite left-right-hand resonators may also be symmetrically arranged about a tilt line, i.e. the first direction x is a tilt line direction, and correspondingly the second direction is another tilt line direction perpendicular to the tilt line direction.
Wherein the input feed line structure 110 is coupled with a tap of a first one of the at least two composite left-right-hand resonators and is gap-coupled, and the output feed line structure 120 is coupled with a tap of a last one of the at least two composite left-right-hand resonators and is gap-coupled to provide electromagnetic excitation. For example, in an example where the at least two composite right-left-hand resonators include 4 composite right-hand resonators, the input feed line structure 110 is tap-coupled and slot-coupled with the first composite right-hand resonator 130a, and the output feed line structure 120 is tap-coupled and slot-coupled with the fourth composite right-hand resonator 130d to provide electromagnetic excitation. That is, the first composite right-left-hand resonator 130a is the first composite right-hand resonator, and the fourth composite right-hand resonator 130d is the last composite right-hand resonator.
At least two composite left-and right-hand resonators are coupled to each other to produce two frequency bands under electromagnetic excitation and for common mode frequency rejection of the two frequency bands. For example, in an example where the at least two composite right-left-hand resonators include 4 composite right-hand resonators, the first composite right-hand resonator 130a is gap-coupled with the second composite right-hand resonator 130b, the second composite right-hand resonator 130b is gap-coupled with the third composite right-hand resonator 130c, and the third composite right-hand resonator 130c is gap-coupled with the fourth composite right-hand resonator 130d.
Under electromagnetic excitation, each composite left-right-hand resonator provides two differential mode frequencies, each differential mode frequency being used to form a frequency band, the center frequencies of the two frequency bands increasing in sequence. Also, the common mode frequency of each of the composite left-and-right-hand resonators is far away from the differential mode frequency, so that each of the composite left-and-right-hand resonators is used for common mode frequency rejection of two frequency bands without loading additional elements.
In this embodiment, two frequency bands are generated by at least two composite left-right-hand resonators under the electromagnetic excitation, so as to realize a multiband dual-frequency balance filter 100 with simple and compact structure, and the at least two composite left-right-hand resonators are used for common-mode frequency suppression of the two frequency bands, so that the suppression degree of common-mode noise is improved, and a multiband dual-frequency balance filter 100 with good performance is realized.
As described above, each of the composite left-right-hand resonators is symmetrically disposed with respect to the second direction y, and at least two of the composite left-right-hand resonators are coupled to each other to generate two frequency bands under electromagnetic excitation and for common mode frequency rejection of the two frequency bands. In some embodiments, each composite right-left-hand resonator includes a pair of microstrip lines and two sets of interdigital structures. Specifically, the pair of microstrip lines includes a first microstrip line 131 and a second microstrip line 132 disposed in parallel along the first direction x, and the two sets of interdigital structures include a first interdigital structure 133 and a second interdigital structure 134 disposed between the first microstrip line 131 and the second microstrip line 132 and located at opposite ends of the first microstrip line 131 and the second microstrip line 132.
Wherein the first microstrip line 131 and the second microstrip line 132 are each symmetrically disposed about the second direction y. That is, the first microstrip line 131 and the second microstrip line 132 are themselves symmetrically disposed.
The first and second interdigital structures 133 and 134 are symmetrically disposed about the second direction y, the first interdigital structure 133 being located at one end of the first and second microstrip lines 131 and 132, and the second interdigital structure 134 being located at the other end of the first and second microstrip lines 131 and 132.
The distance between the first interdigital structure 133 and one ends of the first and second microstrip lines 131 and 132 of each composite right-and-left-hand resonator may be the same or different. For example, in an example in which the at least two composite right-left-hand resonators include 4 composite right-hand resonators, a distance between the first interdigital structure 133 of the first composite right-hand resonator 130a and one end of the first microstrip line 131 is different from a distance between the first interdigital structure 133 of the first composite right-hand resonator 130a and one end of the second microstrip line 132, and a distance between the first interdigital structure 133 of the second composite right-hand resonator 130b and one end of the first microstrip line 131 is the same as a distance between the first interdigital structure 133 of the second composite right-hand resonator 130b and one end of the second microstrip line 132. The ends of the first microstrip line 131 and the second microstrip line 132 are ends where the first interdigital structure 133 is located, and are ends in the same direction. Similarly, since the first interdigital structure 133 and the second interdigital structure 134 are symmetrically disposed about the second direction y, the distance between the second interdigital structure 134 of each of the composite left-right-hand resonators and one ends of the first microstrip line 131 and the second microstrip line 132 may be the same or different.
As shown in fig. 2, a differential mode equivalent circuit diagram of the composite left-right-hand resonator according to the embodiment of the present application is shown, and the left-hand capacitance C is at the differential mode frequency of the composite left-right-hand resonator L And right hand sense of hand L R Is formed by the interdigital capacitance and parasitic effect generated by the first interdigital structure 133 and the second interdigital structure 134, and left-hand inductance L LD And right flashlight C RD Generated by the stubs of the first microstrip line 131 or the second microstrip line 132 and the coupling between the first microstrip line 131 or the second microstrip line 132 and the ground, respectively. As shown in fig. 3, a common mode equivalent circuit diagram of the composite left-right-hand resonator according to the embodiment of the present application is shown, and at the common mode frequency of the composite left-right-hand resonator, the left-hand capacitance C L And right hand sense of hand L R Is formed by the interdigital capacitance and parasitic effect generated by the first interdigital structure 133 and the second interdigital structure 134, and left-hand inductance L LC And right flashlight C RC Generated by the branches of the first microstrip line 131 or the second microstrip line 132 and the coupling between the first microstrip line 131 or the second microstrip line 132 and the ground, respectively, the inductance L G Is caused by leakage current from the open stub of the first microstrip line 131 or the second microstrip line 132 to the ground.
Wherein in FIGS. 2 and 3, C 0 Is a feed capacitor for feeding the composite right-and-left-handed resonator.
As described above, the distances between the first interdigital structure 133 and the one ends of the first and second microstrip lines 131 and 132 of each of the composite left-right-hand resonators may be the same or different, and the distances between the second interdigital structure 134 and the one ends of the first and second microstrip lines 131 and 132 of each of the composite left-right-hand resonators may be the same or different. In some embodiments, the first interdigital structure 133 is a first preset distance d1 from one end of the first microstrip line 131 and a second preset distance d2 from one end of the second microstrip line 132; the second interdigital structure 134 is spaced apart from the other end of the first microstrip line 131 by a first predetermined distance d1, and spaced apart from the other end of the second microstrip line 132 by a second predetermined distance d2.
For example, in an example in which the at least two composite left-right-hand resonators include 4 composite left-right-hand resonators, the first interdigital structure 133 of the first composite left-right-hand resonator 130a is a first preset distance d1 from one end of the first microstrip line 131, a second preset distance d2 from one end of the second microstrip line 132, and the second interdigital structure 134 of the first composite left-right-hand resonator 130a is a first preset distance d1 from the other end of the first microstrip line 131 and a second preset distance d2 from the other end of the second microstrip line 132, where d1 is greater than d2.
The first interdigital structure 133 of the second composite left-right-hand resonator 130b is a first preset distance d1 from one end of the first microstrip line 131, a second preset distance d2 from one end of the second microstrip line 132, and the second interdigital structure 134 of the second composite left-right-hand resonator 130b is a first preset distance d1 from the other end of the first microstrip line 131 and a second preset distance d2 from the other end of the second microstrip line 132, where d1 is equal to d2.
In the at least two composite left-right-hand resonators, the first preset distance d1 of two adjacent composite left-right-hand resonators in the composite left-right-hand resonators located on any side of the symmetrical position is different, and the second preset distance d2 is the same.
For example, in an example in which the at least two complex left-right-hand resonators include 4 complex left-right-hand resonators, since the 4 complex left-right-hand resonators are symmetrically disposed with respect to the first direction x, that is, the first complex left-right-hand resonator 130a and the second complex left-right-hand resonator 130b are symmetric with respect to the third complex left-right-hand resonator 130c and the fourth complex left-right-hand resonator 130d with respect to the first direction x, the complex left-right-hand resonators located on either side of the symmetric positions may be the first complex left-right-hand resonator 130a and the second complex left-right-hand resonator 130b, or may be the third complex left-right-hand resonator 130c and the fourth complex left-right-hand resonator 130d.
Taking the case that the composite left-right-hand resonator located at either side of the symmetrical position is the first composite left-right-hand resonator 130a and the second composite left-right-hand resonator 130b as an example, the first composite left-right-hand resonator 130a and the second composite left-right-hand resonator 130b are adjacent, the first preset distance d1 of the first composite left-right-hand resonator 130a is greater than the first preset distance d1 of the second composite left-right-hand resonator 130b, and the second preset distance d2 of the first composite left-right-hand resonator 130a is equal to the second preset distance d2 of the second composite left-right-hand resonator 130 b.
As described above, the first microstrip line 131 and the second microstrip line 132 are each symmetrically disposed about the second direction y. In some embodiments, the first microstrip line 131 is subjected to a bending process, such that opposite ends of the first microstrip line 131 are opposite; the second microstrip line 132 is subjected to a bending process such that opposite ends of the second microstrip line 132 are opposite.
The first microstrip line 131 and the second microstrip line 132 are bent so that opposite ends thereof are opposite to each other, thereby reducing the size of the composite left-right-hand resonator. Further, since the first and second interdigital structures 133 and 134 are located between the first and second microstrip lines 131 and 132, respectively, the bending directions of the first and second microstrip lines 131 and 132 are opposite. For example, the first microstrip line 131 is bent toward the second microstrip line 132, and the second microstrip line 132 is bent toward the first microstrip line 131, so that the first interdigital structure 133 and the second interdigital structure 134 may be located between the first microstrip line 131 and the second microstrip line 132, respectively.
In at least two composite left-right-hand resonators, for each of the composite left-right-hand resonators, the bending points of the first microstrip line 131 and the second microstrip line 132 may not be located on the same straight line in the second direction y, but may be located on the same straight line in the second direction y.
For example, in an example in which the at least two composite right-left-hand resonators include 4 composite right-hand resonators, the inflection points of the first microstrip line 131 and the second microstrip line 132 of the first composite right-hand resonator 130a are located on the same straight line in the second direction y, and the inflection points of the first microstrip line 131 and the second microstrip line 132 of the second composite right-hand resonator 130b are not located on the same straight line in the second direction y.
In some embodiments, the length of the first microstrip line 131 subjected to the bending process is a first length l1, and the length of the second microstrip line 132 subjected to the bending process is a second length l2; among the at least two composite left-right-hand resonators, the first length l1 of two adjacent composite left-right-hand resonators among the composite left-right-hand resonators located on either side of the symmetrical position is different, and the second length l2 is the same.
For example, in an example in which the at least two complex left-right-hand resonators include 4 complex left-right-hand resonators, since the 4 complex left-right-hand resonators are symmetrically disposed with respect to the first direction x, that is, the first complex left-right-hand resonator 130a and the second complex left-right-hand resonator 130b are symmetric with respect to the third complex left-right-hand resonator 130c and the fourth complex left-right-hand resonator 130d with respect to the first direction x, the complex left-right-hand resonators located on either side of the symmetric positions may be the first complex left-right-hand resonator 130a and the second complex left-right-hand resonator 130b, or may be the third complex left-right-hand resonator 130c and the fourth complex left-right-hand resonator 130d.
Taking the case where the composite left-right-hand resonator located on either side of the symmetrical position is the first composite left-right-hand resonator 130a and the second composite left-right-hand resonator 130b as an example, the first composite left-right-hand resonator 130a and the second composite left-right-hand resonator 130b are adjacent, the first length l1 of the first composite left-right-hand resonator 130a is different from the first length l1 of the second composite left-right-hand resonator 130b, and the second length l2 of the first composite left-right-hand resonator 130a is the same as the second length l2 of the second composite left-right-hand resonator 130 b.
As described above, each composite left-right hand resonator includes a first interdigital structure 133 and a second interdigital structure 134. In some embodiments, the first interdigital structure 133 and the second interdigital structure 134 each include a plurality of pairs of fingers, wherein the plurality of pairs of fingers includes a plurality of first fingers z1 connected to the first microstrip line 131 and a plurality of second fingers z2 connected to the second microstrip line 132, and the plurality of first fingers z1 and the plurality of second fingers z2 are alternately arranged at equal intervals.
The number of the plurality of pairs of fingers can be determined according to the left hand capacity actually required in design, for example, the plurality of pairs of fingers can be 9 pairs of fingers, namely, 9 first fingers z1 and 9 second fingers z2. The first finger z1 and the second finger z2 have the same size.
The first fingers z1 and the second fingers z2 are alternately arranged at equal intervals, and the first fingers z1 and the second fingers z2 can be arranged in an alternating sequence, namely the first fingers z1, the second fingers z2, the first fingers z1 … and the like, or the second fingers z2 and the first fingers z1 can be arranged in an alternating sequence, namely the second fingers z2, the first fingers z1, the second fingers z2 … and the like. In some examples, the alternating order of the plurality of first fingers z1 and the plurality of second fingers z2 may be different for different composite left-right-hand resonators in at least two composite left-right-hand resonators. For example, in an example where the at least two composite left-right hand resonators include 4 composite left-right hand resonators, the first composite left-right hand resonator 130a and the second composite left-right hand resonator 130b are different in an alternating order of the plurality of first fingers z1 and the plurality of second fingers z2, the alternating order of the plurality of first fingers z1 and the plurality of second fingers z2 of the first composite left-right hand resonator 130a is first fingers z1 and second fingers z2, and the alternating order of the plurality of first fingers z1 and the plurality of second fingers z2 of the second composite left-right hand resonator 130b is first fingers z2 and first fingers z1. Note that the alternating sequence described herein refers to an alternating sequence starting from one end of the first microstrip line 131 or the second microstrip line 132, and of course, the present application is not limited thereto, and the alternating sequence may not be described starting from one end of the first microstrip line 131 or the second microstrip line 132.
As described above, the dual-band balanced filter 100 includes a pair of input feed line structures 110 and a pair of output feed line structures 120 symmetrically disposed about the first direction x, and at least two complex left-right-hand resonators symmetrically disposed about the first direction x and sequentially arranged. In some embodiments, the dual-band balanced filter 100 further includes a first cross-line 140 and a second cross-line 150 symmetrically disposed about the second direction y, wherein the first cross-line 140 and the second cross-line 150 are coupled with the first composite right-left-hand resonator and the last composite right-left-hand resonator, respectively, to generate transmission zeroes that are located on both sides of the two frequency bands.
The first and second intersecting lines 140 and 150 are each symmetrically disposed with respect to the first direction x. That is, the first and second intersecting lines 140 and 150 are themselves symmetrically disposed.
The first cross-wire 140 is coupled to the first and last composite left-right-hand resonators and the second cross-wire 150 is coupled to the first and last composite left-right-hand resonators. For example, a first cross-wire 140 has one end coupled to the first composite right-left-hand resonator and the other end coupled to the last composite right-hand resonator. One end of the second cross-wire 150 is coupled to the first composite left-right-hand resonator and the other end is coupled to the last composite left-right-hand resonator. Thereby introducing cross coupling between the first composite left-right-hand resonator and the last composite left-right-hand resonator to create transmission zeroes on both sides of the two frequency bands, further improving the selectivity of the dual-band balanced filter 100.
For example, in an example where the at least two composite right-left-hand resonators include 4 composite right-hand resonators, the first cross-wire 140 is coupled with the first composite right-left-hand resonator 130a and the fourth composite right-left-hand resonator coupling 130d, and the second cross-wire 150 is coupled with the first composite right-hand resonator 130a and the fourth composite right-left-hand resonator coupling 130d.
Further, in some examples, one end of the first cross-wire 140 is coupled with the first composite right-left-hand resonator slot, the other end is coupled with the last composite right-hand resonator slot, and one end of the second cross-wire 150 is coupled with the first composite right-hand resonator slot, the other end is coupled with the last composite right-hand resonator slot. At this time, the two ends of the first cross wire 140 are subjected to two bending processes, so that the first cross wire 140 is coupled with the first composite left-right-hand resonator and the last composite left-right-hand resonator, and is not coupled with other composite left-right-hand resonators of the at least two composite left-right-hand resonators, and similarly, the two ends of the second cross wire 150 are subjected to two bending processes, so that the second cross wire 150 is coupled with the first composite left-right-hand resonator and the last composite left-right-hand resonator, and is not coupled with other composite left-right-hand resonators of the at least two composite left-right-hand resonators.
As mentioned above, the pair of input feed line structures 110 and the pair of output feed line structures 120 are symmetrically arranged with respect to the first direction x, for example, vertically symmetrically arranged, in which case, in some embodiments, the pair of input feed line structures 110 are themselves symmetrically arranged and the pair of output feed line structures 120 are themselves symmetrically arranged. For example, the pair of input feed line structures 110 are themselves horizontally symmetrical, and as a result of the pair of input feed line structures 110 being vertically symmetrical to the pair of output feed line structures 120, the pair of input feed line structures 110 are also themselves horizontally symmetrical.
Specifically, in some embodiments, the pair of input feed line structures 110 includes a first input feed line 111 and a second input feed line 112 symmetrically disposed about the second direction y, and the pair of output feed line structures 120 includes a first output feed line 121 and a second output feed line 122 symmetrically disposed about the second direction y, wherein the first input feed line and the first output feed line are symmetrically disposed about the first direction x, and the second input feed line and the second output feed line are symmetrically disposed about the first direction x. In the present embodiment, the symmetrical arrangement of the first and second input feed lines 111 and 112 and the first and second output feed lines 121 and 122 is a horizontal lower upper symmetrical arrangement, i.e., the second direction y is a horizontal direction, but the present application is not limited thereto, and it may be arranged according to practical circuit design considerations.
One end of each of the first input feeder 111, the second input feeder 112, the first output feeder 121, and the second output feeder 122 is used to achieve slot coupling and tap coupling, and the other end is used as an input port/output port. The other ends of the first input feeder 111 and the second input feeder 112 serve as input ports to be fed with electromagnetic signals, and the other ends of the first output feeder 121 and the second output feeder 122 serve as output ports to be fed with electromagnetic signals. Note that the arrangement of the input port and the output port is merely illustrative, and the input port and the output port may be reversed.
Further, in some embodiments, each of the first input feeder 111, the second input feeder 112, the first output feeder 121, and the second output feeder 122 includes a feeding portion k1, a first coupling portion k2, and a second coupling portion k3 connected in sequence, wherein the feeding portion k1 and the second coupling portion k3 are located at both sides of the first coupling portion k2 and perpendicular to the first coupling portion k2, the feeding portion k1 serves as an input/output port, the first coupling portion k2 is used to implement slot coupling, and the second coupling portion k3 is used to implement tap coupling.
As described above, the at least two composite left-right-hand resonators include 4 composite left-right-hand resonators, i.e., the first composite left-right-hand resonator 130a, the second composite left-right-hand resonator 130b, the third composite left-right-hand resonator 130c, and the fourth composite left-right-hand resonator 130d. In some embodiments, the gap between the first composite right-left-hand resonator 130a and the second composite right-hand resonator 130b and the gap between the third composite right-hand resonator 130c and the fourth composite right-hand resonator 130d are both the first gap g1, and the gap between the second composite right-hand resonator 130b and the third composite right-hand resonator 130c is the second gap g2; wherein a first gap g1 is used for gap coupling between the first composite right-left-hand resonator 130a and the second composite right-left-hand resonator 130b and for gap coupling between the third composite right-hand resonator 130c and the fourth composite right-left-hand resonator 130d, and a second gap g2 is used for gap coupling between the second composite right-hand resonator 130b and the third composite right-hand resonator 130 c; wherein the first gap g1 is smaller than the second gap g2.
As described above, the dual-band balanced filter 100 includes a pair of input feed line structures 110 and a pair of output feed line structures 120 symmetrically disposed about the first direction x, and at least two complex left-right-hand resonators symmetrically disposed about the first direction x and sequentially arranged. That is, a dielectric substrate is used to fabricate the dual-band balanced filter 100. In some embodiments, the dielectric substrate may be a high-temperature superconductive dielectric substrate made of magnesium oxide, and the upper and lower surfaces of the high-temperature superconductive dielectric substrate are made of yttrium barium copper oxide superconductive films, which have a dielectric constant of 9.78 and a thickness of 0.5mm, and at this time, the dual-frequency balance filter 100 has small loss and high quality factor, so that the dual-frequency balance filter 100 has better effect, stable use and long service life when applied to the dual-frequency balance filter 100. Of course, it is within the understanding of those skilled in the art that the dielectric substrate may also be used to fabricate the dual-band balanced filter 100 with other parameters, which are not limited herein.
Taking the example that the at least two composite left-right-hand resonators include 4 composite left-right-hand resonators, the dual-frequency balance filter 100 of the above embodiment of the present application is formed to have a size of 0.12×0.25 λg 2 The λg is the guided wave wavelength of 2.45GHz, and can be applied to a radio frequency front-end circuit.
As shown in fig. 4, a graph of scattering parameters of a dual-band balanced filter based on a composite left-right hand according to an embodiment of the present application is shown. For the dual-band balanced filter 100 of the above embodiment, when the dual-band balanced filter is fabricated by using a high-temperature superconductive dielectric substrate, the center frequencies of the two frequency bands are 2.45GHz and 3.56GHz, the 3-dB relative bandwidths (FBW) are 5.5% and 6.7%, respectively, and the in-band insertion loss is less than 0.1dB. The common mode insertion loss is greater than 50dB, i.e., the common mode rejection level of both bands is better than 50dB, and the common mode rejection level is better than 50dB in the wide frequency range of 1-5.2 GHz. In addition, two sides of the two frequency bands are respectively provided with two transmission zeros, so that the selectivity of the frequency bands is improved.
Those skilled in the art will readily appreciate that many modifications and variations are possible in the device and method while maintaining the teachings of the present application. Accordingly, the above disclosure should be viewed as limited only by the scope of the appended claims.
Claims (10)
1. A dual-band balanced filter based on composite left and right hands, comprising:
a pair of input feeder structures and a pair of output feeder structures symmetrically arranged about a first direction, and at least two composite left-right-hand resonators symmetrically arranged about the first direction and sequentially arranged, wherein each of the at least two composite left-right-hand resonators is symmetrically arranged about a second direction, the second direction being mutually perpendicular to the first direction;
wherein the pair of input feed line structures is coupled and gap-coupled with a first one of the at least two composite left-right-hand resonators, and the pair of output feed line structures is coupled and gap-coupled with a last one of the at least two composite left-right-hand resonators to provide electromagnetic excitation;
the at least two composite left-right-hand resonators are coupled to each other to generate two frequency bands under electromagnetic excitation and for common mode frequency rejection of the two frequency bands.
2. The composite left-right hand based dual-band balanced filter according to claim 1, wherein each of the at least two composite left-right hand resonators includes first and second microstrip lines disposed in parallel along the first direction and first and second interdigital structures disposed between and at opposite ends of the first and second microstrip lines;
wherein the first microstrip line and the second microstrip line are both symmetrically arranged with respect to the second direction;
the first interdigital structure and the second interdigital structure are symmetrically arranged about the second direction, the first interdigital structure is positioned at one end of the first microstrip line and one end of the second microstrip line, and the second interdigital structure is positioned at the other end of the first microstrip line and the other end of the second microstrip line.
3. A dual-band balanced filter based on composite left and right hands as claimed in claim 2, wherein,
the first interdigital structure is a first preset distance away from one end of the first microstrip line and a second preset distance away from one end of the second microstrip line;
the second interdigital structure is at the first preset distance from the other end of the first microstrip line and at the second preset distance from the other end of the second microstrip line;
among the at least two composite left-right-hand resonators, the first preset distances of two adjacent composite left-right-hand resonators in the composite left-right-hand resonators located on any side of the symmetrical position are different, and the second preset distances are the same.
4. The dual-band balanced filter based on composite left and right hands according to claim 2, wherein the first microstrip line is subjected to a bending process such that opposite ends of the first microstrip line are opposite;
the second microstrip line is subjected to bending treatment, so that opposite ends of the second microstrip line are opposite.
5. The dual-band balanced filter according to claim 4, wherein the first microstrip line has a first length after being folded, and the second microstrip line has a second length after being folded;
and in the at least two composite left-right-hand resonators, the first lengths of two adjacent composite left-right-hand resonators in the composite left-right-hand resonators positioned on any side of the symmetrical position are different, and the second lengths are the same.
6. The composite left-right hand based dual band balanced filter according to claim 2, wherein the first interdigital structure and the second interdigital structure each comprise a plurality of pairs of fingers, wherein the plurality of pairs of fingers comprise a plurality of first fingers connected to the first microstrip line and a plurality of second fingers connected to the second microstrip line, the plurality of first fingers and the plurality of second fingers being alternately arranged at equal intervals.
7. The composite left-right hand based dual band balanced filter according to claim 1, further comprising a first cross line and a second cross line symmetrically disposed about the second direction, wherein the first cross line and the second cross line are coupled with the first composite left-right hand resonator and the last composite left-right hand resonator, respectively, to create transmission zeros located on both sides of the two frequency bands.
8. A dual-band balanced filter based on composite left and right hands as claimed in any one of claims 1 to 7,
the pair of input feed line structures includes a first input feed line and a second input feed line symmetrically disposed about the second direction, and the pair of output feed line structures includes a first output feed line and a second output feed line symmetrically disposed about the second direction;
the first input feeder line and the first output feeder line are symmetrically arranged with respect to the first direction, and the second input feeder line and the second output feeder line are symmetrically arranged with respect to the first direction.
9. The composite left-right hand based dual band balanced filter according to claim 8, wherein each of the first input feed line, the second input feed line, the first output feed line, and the second output feed line comprises a feed portion, a first coupling portion, and a second coupling portion connected in sequence, wherein the feed portion and the second coupling portion are located at both sides of the first coupling portion and perpendicular to the first coupling portion, the feed portion serves as an input/output port, the first coupling portion is for realizing slot coupling, and the second coupling portion is for realizing tap coupling.
10. The composite left-right hand based dual-band balanced filter according to any one of claims 1-7, wherein the at least two composite left-right hand resonators include a first composite left-right hand resonator and a fourth composite left-right hand resonator symmetrically disposed about the first direction and a second composite left-right hand resonator and a third composite left-right hand resonator symmetrically disposed about the first direction;
the first composite left-right-hand resonator is a first composite left-right-hand resonator of the at least two composite left-right-hand resonators, and the fourth composite left-right-hand resonator is a last composite left-right-hand resonator of the at least two composite left-right-hand resonators;
the gap between the first composite left-right-hand resonator and the second composite left-right-hand resonator and the gap between the third composite left-right-hand resonator and the fourth composite left-right-hand resonator are both first gaps, and the gap between the second composite left-right-hand resonator and the third composite left-right-hand resonator is a second gap;
the first gap is used for gap coupling between the first composite left-right-hand resonator and the second composite left-right-hand resonator and gap coupling between the third composite left-right-hand resonator and the fourth composite left-right-hand resonator, and the second gap is used for gap coupling between the second composite left-right-hand resonator and the third composite left-right-hand resonator;
wherein the first gap is smaller than the second gap.
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