CN114725643A - Terahertz dual-mode folding multiplexer - Google Patents
Terahertz dual-mode folding multiplexer Download PDFInfo
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- CN114725643A CN114725643A CN202210653129.7A CN202210653129A CN114725643A CN 114725643 A CN114725643 A CN 114725643A CN 202210653129 A CN202210653129 A CN 202210653129A CN 114725643 A CN114725643 A CN 114725643A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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Abstract
The invention relates to the field of terahertz, in particular to a terahertz dual-mode folding multiplexer. The input end is connected with the input waveguide, the transition branch of the first band-pass filter is connected with the first output waveguide, and the transition branch of the second band-pass filter is connected with the second output waveguide; the transition branch of the first band-pass filter is perpendicular to the transition branch of the second band-pass filter, and the center line of the input waveguide, the center line of the input end and the center line of the transition branch of the first band-pass filter are superposed. According to the terahertz dual-mode folding multiplexer, the transition branch of the first band-pass filter is perpendicular to the transition branch of the second band-pass filter, the center line of the input waveguide, the center line of the input end and the center line of the transition branch of the first band-pass filter are overlapped, and the lengths of the branches are used for adjusting the matching of channels, so that the isolation of the duplexer is improved, the simulation difficulty is reduced, and the processing is easier.
Description
Technical Field
The invention relates to the field of terahertz, in particular to a terahertz dual-mode folding multiplexer.
Background
The terahertz wave is an electromagnetic wave with the frequency in the range of 0.1-10 THz, the frequency spectrum of the terahertz wave is located between the millimeter wave and the infrared light wave, and the terahertz wave has the characteristics of microwave and light wave, so that the terahertz technology becomes an important extension of the research of electronics and photonics. With the continuous progress of terahertz frequency band semiconductor devices, radiation sources, detectors and systems, the terahertz technology has become a very active leading-edge subject which has important influence on modern scientific technology and national defense construction, and has great application value on national economy and national safety.
The terahertz duplexer is an important part for separating the terahertz signal spectrum. The duplexer is an indispensable important device in communication, navigation, guidance and radar systems. Common duplexers at present include a sound band surface wave duplexer, a dielectric duplexer, a coaxial duplexer, a waveguide duplexer, a microstrip duplexer, and the like. Because transmission structures such as microstrip lines and strip lines have large loss, low power capacity and influence of processing precision, the transmission structures are not used for the design of duplexers in high frequency bands. Especially in terahertz wave band, metal cavity waveguide is mostly adopted for realization. When the metal cavity is designed, the H-face processing cavity is easy to damage the wall current distribution, thereby influencing the performance of the device. Therefore, the terahertz duplexer based on the metal waveguide preferably adopts E-plane processing.
The existing terahertz duplexer based on metal cavity waveguide and realized by E-plane processing generally comprises two band-pass filters and a T-shaped junction or a Y-shaped junction, and the structure of the existing common terahertz duplexer is that two sides of the terahertz duplexer comprise a plurality of metal resonant cavities and are Chebyshev response filters, the middle of the terahertz duplexer is a T-shaped junction, input and output ports are distributed in parallel on the same horizontal plane, and the input and output ports generally form an included angle of 180 degrees. The structure is matched by adjusting a rectangular metal convex structure in the middle of the T-shaped junction or adding a metal membrane at a common port, and discontinuity and interference between filters are reduced by adjusting an optimization circuit and the size of a resonant cavity, so that the duplexer can work normally. However, two output ports of the terahertz duplexer formed by the three ports based on the T-type junction or the Y-type junction are parallel, and an echo of one port is easy to leak from the other port, so that the isolation between the two ports is relatively poor; when the two channel frequency bands are close to each other, the duplex isolation degree is further worsened; in addition, the metal resonant cavities of the Chebyshev response filter formed by the duplexer by adopting the straight waveguides are more in number and large in size, so that the duplex insertion loss is increased; meanwhile, the out-of-band rejection of the two band-pass filters is relatively poor when cavities with fewer orders are adopted, particularly in a high-frequency band, the out-of-band rejection is not easy to reject, and the out-of-band mutual influence can be caused when the dual-band frequency band is close to the dual-band filter, so that the improvement of the isolation performance between the duplex ports is not facilitated.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the terahertz dual-mode folding multiplexer which is simple in structure, improves the isolation degree and is more convenient to process.
The technical scheme adopted by the invention is as follows: the terahertz dual-mode folding multiplexer comprises an input waveguide, a first output waveguide, a second output waveguide and folding branches, wherein the input waveguide, the first output waveguide, the second output waveguide and the folding branches are positioned on an E plane, each folding branch comprises an input end, a first band-pass filter transition branch and a second band-pass filter transition branch, the input end is connected with the input waveguide, the first band-pass filter transition branch is connected with the first output waveguide, and the second band-pass filter transition branch is connected with the second output waveguide; the transition branch of the first band-pass filter is perpendicular to the transition branch of the second band-pass filter, and the central line of the input waveguide, the central line of the input end and the central line of the transition branch of the first band-pass filter are superposed; and a first E-surface elliptic response filter structure is arranged on the first output waveguide, and a second E-surface elliptic response filter structure is arranged on the second output waveguide.
In order to better implement the invention, the first E-plane elliptic response filter structure comprises a single-mode cavity in the first band-pass filter close to the transition branch of the first band-pass filter and a double-mode cavity in the first band-pass filter far from the transition branch of the first band-pass filter.
In order to better realize the invention, the outer side of the single-mode cavity in the first band-pass filter and the outer side of the double-mode cavity in the first band-pass filter are matched with the diaphragm in the first band-pass filter.
In order to better realize the invention, the second E-surface elliptic response filter structure comprises a single-mode cavity in the second band-pass filter close to the transition stub of the second band-pass filter and a double-mode cavity in the second band-pass filter far away from the transition stub of the second band-pass filter.
In order to better realize the invention, the outer side of the single-mode cavity in the second band-pass filter and the outer side of the double-mode cavity in the second band-pass filter are both matched with the diaphragms in the second band-pass filter.
In order to better realize the invention, the length of the transition branch of the first band-pass filter is a, a is integral multiple of half of the waveguide length corresponding to the central frequency of the first E-surface elliptical response filter structure, the length of the transition branch of the second band-pass filter is b, and b is integral multiple of half of the waveguide length corresponding to the central frequency of the second E-surface elliptical response filter structure.
In order to better realize the invention, the terahertz dual-mode folding multiplexer comprises two symmetrical parts which are connected together, and flange plates which are matched with the tail ends of the input waveguide, the first output waveguide and the second output waveguide are arranged on the two symmetrical parts.
In order to better realize the invention, a pin hole for convenient and quick positioning and a screw hole for convenient connection are arranged on the two symmetrical parts.
In order to better realize the invention, a concave part is arranged at the corner of one of the symmetrical parts, and a convex plate matched with the concave part is arranged at the corner of the other symmetrical part.
In order to better realize the invention, a second folding branch is additionally arranged between the input waveguide and the folding branch, the second folding branch is connected with a third output waveguide, and a third E-surface elliptical response filter structure is arranged on the third output waveguide.
The invention has the beneficial effects that:
1. compared with the prior art, the terahertz dual-mode folding multiplexer has the advantages that through the matching of the input waveguide, the first output waveguide, the second output waveguide, the input end, the transition branch of the first band-pass filter, the transition branch of the second band-pass filter and the like, the transition branch of the first band-pass filter is perpendicular to the transition branch of the second band-pass filter, the center line of the input waveguide, the center line of the input end and the center line of the transition branch of the first band-pass filter are superposed, and the matching of channels is adjusted through the lengths of the branches, so that the isolation degree of a duplexer is improved, the simulation difficulty is reduced, and the processing is easier.
2. The invention adopts a pure cavity structure, the first output waveguide and the second output waveguide adopt an elliptical response cavity filter consisting of dual-mode resonant cavities, less resonant cavities can be used, the invention has the advantages of compact structure, small insertion loss, easy E-surface processing and good out-of-band rejection performance of the two-channel filter, and the first output waveguide and the second output waveguide of the duplexer have better isolation.
3. The terahertz waveguide duplexer is composed of an upper symmetrical part and a lower symmetrical part, wherein four corners of one symmetrical part are provided with bosses with certain heights, four corners of the other symmetrical part are provided with recesses with certain heights, the two symmetrical parts are assembled more compactly by pins, the whole terahertz waveguide duplexer is split and processed along the center of the E surface of the duplexer, three waveguide ports are located on the same plane, each waveguide port is located on the same plane, and each waveguide port is provided with a corresponding flange.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a terahertz dual-mode folding multiplexer according to the present invention;
FIG. 2 is a schematic structural diagram of a folding branch of the terahertz dual-mode folding multiplexer according to the present invention;
FIG. 3 is a schematic structural diagram of the terahertz dual-mode folding multiplexer according to the present invention;
FIG. 4 is a circuit diagram of the terahertz dual-mode folding multiplexer of the present invention applied to the WR-2.8 band;
FIG. 5 is a simulation diagram of the application of the terahertz dual-mode folding multiplexer of the present invention in the WR-2.8 band;
FIG. 6 is a schematic diagram of a structure of a terahertz triplexer based on the concept of the present invention;
in the figure, 1-a double-mode cavity in the second band-pass filter, 2-a single-mode cavity in the second band-pass filter, 3-a diaphragm in the second band-pass filter, 4-a single-mode cavity in the first band-pass filter, 5-a double-mode cavity in the first band-pass filter, 6-a diaphragm in the first band-pass filter, 7-an input waveguide, 8-a first output waveguide, 9-a second output waveguide, 10-a transition branch of the second band-pass filter, 11-a transition branch of the first band-pass filter, 12-a flange, 13-a pin hole, 14-a screw hole, 15-a boss, 16-a recess, 17-a third output waveguide, 18-a diaphragm in the third band-pass filter, 19-a single-mode cavity in the third band-pass filter, and 20-a double-mode cavity in the third band-pass filter.
Detailed Description
The following description provides many different embodiments, or examples, for implementing different features of the invention. The particular examples set forth below are illustrative only and are not intended to be limiting.
As shown in fig. 1 to fig. 3, the terahertz dual-mode folded multiplexer of the present invention includes an input waveguide 7, a first output waveguide 8, a second output waveguide 9, and a folded branch located on an E plane, where the folded branch includes an input end, a first bandpass filter transition branch 11, and a second bandpass filter transition branch 10, the input end is connected to the input waveguide 7, the first bandpass filter transition branch 11 is connected to the first output waveguide 8, and the second bandpass filter transition branch 10 is connected to the second output waveguide 9; the first band-pass filter transition branch 11 is perpendicular to the second band-pass filter transition branch 10, and the central line of the input waveguide 7, the central line of the input end and the central line of the first band-pass filter transition branch 11 are superposed; a first E-plane elliptic response filter structure is arranged on the first output waveguide 8, and a second E-plane elliptic response filter structure is arranged on the second output waveguide 9. According to the terahertz dual-mode folding multiplexer, the input waveguide 7, the first output waveguide 8, the second output waveguide 9, the input end, the first band-pass filter transition branch 11, the second band-pass filter transition branch 10 and the like are matched, the first band-pass filter transition branch 11 is perpendicular to the second band-pass filter transition branch 10, the center line of the input waveguide 7, the center line of the input end and the center line of the first band-pass filter transition branch 11 are overlapped, and the lengths of the branches are used for adjusting the matching of channels, so that the isolation degree of a duplexer is improved, the simulation difficulty is reduced, and the processing is easier.
Preferably, the first E-plane elliptic response filter structure includes a single-mode cavity 4 in the first band-pass filter close to the first band-pass filter transition branch 11 and a double-mode cavity 5 in the first band-pass filter far from the first band-pass filter transition branch 11, and the outer side of the single-mode cavity 4 in the first band-pass filter and the outer side of the double-mode cavity 5 in the first band-pass filter are both matched with the diaphragm 6 in the first band-pass filter. Preferably, the second E-plane elliptic response filter structure comprises a single-mode cavity 2 in the second band-pass filter close to the transition branch 10 of the second band-pass filter and a double-mode cavity 1 in the second band-pass filter far from the transition branch 10 of the second band-pass filter, and the outer side of the single-mode cavity 2 in the second band-pass filter and the outer side of the double-mode cavity 1 in the second band-pass filter are both matched with a diaphragm 3 in the second band-pass filter.
The two-channel filter (the first E-surface elliptical response filter structure and the second E-surface elliptical response filter structure) has good out-of-band rejection performance, so that the first output waveguide and the second output waveguide of the duplexer have better isolation.
Preferably, the length of the first band-pass filter transition branch 11 is a, a is an integral multiple of one-half of the waveguide length corresponding to the center frequency of the first E-plane elliptic response filter structure, the length of the second band-pass filter transition branch 10 is b, and b is an integral multiple of one-half of the waveguide length corresponding to the center frequency of the second E-plane elliptic response filter structure. Therefore, the frequency spectrum leading to the second output waveguide 9 is difficult to transmit in an open circuit state due to different frequency bands of the first output waveguide 8, the frequency spectrum of the second output waveguide 9 can still be transmitted after passing through the half-wave guided wave long distance b of the second output waveguide 9, and the signal leading to the first output waveguide 8 is treated in the same way, so that the duplexer adopting the structure has the advantage that the duplexer isolation is further improved.
Preferably, the terahertz dual-mode folding multiplexer comprises two symmetrical parts connected together, and flanges 12 matched with the ends of the input waveguide 7, the first output waveguide 8 and the second output waveguide 9 are arranged on the two symmetrical parts. On both said symmetrical parts, a pin hole 13 facilitating quick positioning and a screw hole 14 facilitating connection are provided. In the corner of one of said symmetrical parts there is provided a recess 16 and in the corner of the other symmetrical part there is provided a boss 15 cooperating with the recess 16. The terahertz waveguide duplexer is composed of an upper symmetrical part and a lower symmetrical part, wherein bosses 15 with certain heights are arranged at four corners of one symmetrical part, and recesses 16 with certain heights are arranged at four corners of the other symmetrical part, so that the two symmetrical parts are assembled more compactly by pins, the whole terahertz waveguide duplexer is split and processed along the center of the E surface of the duplexer, each waveguide port is located on the same plane, and the waveguide port is provided with a corresponding flange 12.
Preferably, the terahertz duplexer of the present application is adopted, two output ports of the terahertz duplexer present a right-angle distribution, and compared with a three-port device such as a T-junction or a Y-junction at 180 degrees, two output channel paths are changed, so that an echo at one output port is not easily leaked from the other port directly, and the length of the first bandpass filter transition branch 11 is adjusted to be an integral multiple of one-half of the waveguide length corresponding to the center frequency of the first E-plane elliptic response filter structure, the length of the second bandpass filter transition branch 10 is b, and b is an integral multiple of one-half of the waveguide length corresponding to the center frequency of the second E-plane elliptic response filter structure. Therefore, the frequency spectrum leading to the second output waveguide 9 is difficult to transmit in an open circuit state due to different frequency bands of the first output waveguide 8, the frequency spectrum of the second output waveguide 9 can still be transmitted after passing through the half-wave guided wave long distance b of the second output waveguide 9, and the same is true for the signal leading to the first output waveguide 8, so the duplexer adopting the structure has the advantage that the duplexer isolation is further improved; meanwhile, the transition branch 11 of the first band-pass filter is perpendicular to the transition branch 10 of the second band-pass filter, adjustment and optimization are directly not needed through inserting a diaphragm or a protruding structure, only two a and b lengths are needed to be adjusted to match double channels, the structure is simple, and optimization and machining are more convenient.
For the filter of two channels, an elliptical response filter containing a TM mode dual-mode resonant cavity and a TE mode dual-mode resonant cavity is adopted, so that the filter is easy to process an E surface, less cavities are adopted relative to a straight waveguide, the insertion loss of a duplexer is smaller, and in the mode, because a single-cavity dual mode can generate a zero point in the phase reversal of magnetic lines of force of an input port and an output port, the filter has higher frequency selectivity, when duplex dual-frequency bands are close, the out-of-band of each of the two band-pass bands cannot influence each other, and the isolation of the two duplex channels is facilitated.
The overall circuit structure is shown in fig. 4, the final effect is equivalent to two channels by folding the branches, taking WR-2.8 band duplex as an example, and the performance result is shown in fig. 5, it can be seen that the structure still has better isolation and lower insertion loss when the band-pass is close, and each channel has higher filtering characteristic and better echo characteristic.
As shown in fig. 6, a second folded branch is additionally disposed between the input waveguide 7 and the folded branch, the second folded branch is connected to a third output waveguide 17, and a third E-plane elliptic response filter structure is disposed on the third output waveguide 17. The third E-surface elliptical response filter structure comprises a single-mode cavity 19 in a third band-pass filter close to the second folding branch and a double-mode cavity 20 in the third band-pass filter far away from the second folding branch, and the outer side of the single-mode cavity 19 in the third band-pass filter and the outer side of the double-mode cavity 20 in the third band-pass filter are matched with a diaphragm 18 in the third band-pass filter.
As shown in fig. 6, the third output waveguide 17 is added to form a triplexer, and a third E-plane elliptic response filter structure of the terahertz triplexer is formed by cascading a dual-mode cavity 20 in the third band-pass filter and a single-mode cavity in the third band-pass filter, so as to form a fifth-order band-pass filter. The dual-mode cavity 20 of the third bandpass filter introduces a transmission zero on the third output waveguide 17 and the lower stop band. The common single-mode resonant cavity is adopted, so that the response of each channel can be quickly recovered under the condition of not changing the TZ position in the design process (namely the size of a double-mode cavity does not need to be changed in the subsequent optimization of the triplexer), and the design difficulty is greatly reduced. Meanwhile, parasitic stray caused by high-order modes can be minimized, and therefore isolation between channels is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Terahertz bimodulus folding multiplexer, its characterized in that: the broadband waveguide filter comprises an input waveguide (7), a first output waveguide (8), a second output waveguide (9) and folding branches, wherein the input waveguide (7), the first output waveguide (8), the second output waveguide (9) and the folding branches are located on an E plane, each folding branch comprises an input end, a first bandpass filter transition branch (11) and a second bandpass filter transition branch (10), the input end is connected with the input waveguide (7), the first bandpass filter transition branch (11) is connected with the first output waveguide (8), and the second bandpass filter transition branch (10) is connected with the second output waveguide (9); the first band-pass filter transition branch (11) is perpendicular to the second band-pass filter transition branch (10), and the central line of the input waveguide (7), the central line of the input end and the central line of the first band-pass filter transition branch (11) are superposed; a first E-surface elliptical response filter structure is arranged on the first output waveguide (8), and a second E-surface elliptical response filter structure is arranged on the second output waveguide (9).
2. The terahertz dual-mode folding multiplexer of claim 1, wherein: the first E-surface elliptic response filter structure comprises a single-mode cavity (4) in the first band-pass filter close to the first band-pass filter transition (11) and a double-mode cavity (5) in the first band-pass filter far away from the first band-pass filter transition (11).
3. The terahertz dual-mode folding multiplexer of claim 2, wherein: the outer side of a single-mode cavity (4) in the first band-pass filter and the outer side of a double-mode cavity (5) in the first band-pass filter are both matched with a diaphragm (6) in the first band-pass filter.
4. The terahertz dual-mode folding multiplexer of claim 1, wherein: the second E-surface elliptic response filter structure comprises a single-mode cavity (2) in the second band-pass filter close to the transition branches (10) of the second band-pass filter and a double-mode cavity (1) in the second band-pass filter far away from the transition branches (10) of the second band-pass filter.
5. The terahertz dual-mode folding multiplexer of claim 4, wherein: and the outer side of the single-mode cavity (2) in the second band-pass filter and the outer side of the dual-mode cavity (1) in the second band-pass filter are both matched with a diaphragm (3) in the second band-pass filter.
6. The terahertz dual-mode folding multiplexer of claim 1, wherein: the length of the first band-pass filter transition branch (11) is a, a is integral multiple of one half of the waveguide length corresponding to the central frequency of the first E-surface elliptical response filter structure, the length of the second band-pass filter transition branch (10) is b, and b is integral multiple of one half of the waveguide length corresponding to the central frequency of the second E-surface elliptical response filter structure.
7. The terahertz dual-mode folding multiplexer of claim 1, wherein: the terahertz dual-mode folding multiplexer comprises two symmetrical parts which are connected together, wherein flange plates (12) which are matched with the tail ends of the input waveguide (7), the first output waveguide (8) and the second output waveguide (9) are arranged on the two symmetrical parts.
8. The terahertz dual-mode folding multiplexer of claim 7, wherein: the two symmetrical parts are provided with a pin hole (13) and a screw hole (14).
9. The terahertz dual-mode folding multiplexer of claim 7, wherein: a recess (16) is provided at a corner of one of the symmetrical portions, and a boss (15) fitted into the recess (16) is provided at a corner of the other of the symmetrical portions.
10. The terahertz dual-mode folding multiplexer of any one of claims 1 to 9, wherein: and a second folding branch is additionally arranged between the input waveguide (7) and the folding branch, the second folding branch is connected with a third output waveguide (17), and a third E-surface elliptical response filter structure is arranged on the third output waveguide (17).
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