CN210628460U - Duplexer and communication equipment - Google Patents
Duplexer and communication equipment Download PDFInfo
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- CN210628460U CN210628460U CN201922129786.8U CN201922129786U CN210628460U CN 210628460 U CN210628460 U CN 210628460U CN 201922129786 U CN201922129786 U CN 201922129786U CN 210628460 U CN210628460 U CN 210628460U
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Abstract
The utility model provides a duplexer and communication equipment, the duplexer includes: the device comprises a cover plate and a base, wherein the cover plate comprises a K frequency band interface part and a resonant cavity; the base comprises an orthogonal mode coupler, a step transition piece and a Ka frequency band interface piece; one end of the resonant cavity is connected with the K frequency band interface piece; the other end of the resonant cavity is connected with one end of the step transition piece; the other end of the step transition piece is connected with a first electrical port of the orthogonal mode coupler; a common port of the orthogonal mode coupler is connected with an antenna; and the second electrical port of the orthogonal mode coupler is connected with the Ka frequency band interface piece.
Description
Technical Field
The utility model relates to a satellite communication technical field especially relates to a duplexer and communication equipment.
Background
In a mobile communication system, when a communication device adopts a dual-polarized antenna to realize a receiving and transmitting sharing function, a duplexer is required to polarize and separate a received signal and a transmitted signal so as to realize the isolation of the received signal and the transmitted signal, thereby ensuring that both the receiving function and the transmitting function can normally work. With the rapid development of mobile communication, dual polarized antennas with a transceiving function are more and more widely used, so that the usage of duplexers is more and more important, however, the current duplexers cannot achieve the balance among performance, volume and cost.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention is directed to a duplexer and a communication device.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
in a first aspect, the present invention provides a duplexer, comprising: a cover plate and a base, wherein,
the cover plate comprises a K frequency band interface part and a resonant cavity; the base comprises an orthogonal mode coupler, a step transition piece and a Ka frequency band interface piece;
one end of the resonant cavity is connected with the K frequency band interface piece; the other end of the resonant cavity is connected with one end of the step transition piece;
the other end of the step transition piece is connected with a first electrical port of the orthogonal mode coupler; a common port of the orthogonal mode coupler is connected with an antenna; and the second electrical port of the orthogonal mode coupler is connected with the Ka frequency band interface piece.
In the above solution, the input and output ports of the K-band interface and the Ka-band interface are rectangular structures; and the common port of the orthogonal mode coupler is in a circular structure.
In the above scheme, a short-circuit surface is arranged on the orthogonal mode coupler; the position and the size of the short circuit surface are both adjustable.
In the above scheme, a capacitive diaphragm filter is disposed in the resonant cavity.
In the above scheme, a turning waveguide is arranged on the step transition piece; the turn waveguide connects the step transition piece with the resonant cavity.
In the above scheme, the duplexer is provided with a draft angle.
In the above scheme, the orthogonal mode coupler is provided with a coupling window, and the position and size of the coupling window are adjustable.
In the above scheme, the input/output port of the K-band interface component adopts a rectangular waveguide of 10.67mm by 4.32 mm; the input and output ports of the Ka-band interface piece adopt 7.112 mm-3.556 mm rectangular waveguides; and the common port of the orthogonal mode coupler adopts a circular waveguide with the diameter of 11.2 mm.
In the above solution, the transmission directions of the K-band horizontally polarized signals of the resonant cavity are respectively perpendicular to a first plane where a common port of the orthomode coupler is located, a second plane where an input/output port of the K-band interface is located, and a third plane where an input/output port of the Ka-band interface is located; and a first plane where a common port of the orthogonal mode coupler is positioned is respectively vertical to a second plane where an input/output port of the K-band interface piece is positioned and a third plane where an input/output port of the Ka-band interface piece is positioned.
In a second aspect, the present invention further provides a communication device, which includes any one of the above duplexers.
The utility model provides a duplexer and communication equipment, the duplexer includes: the device comprises a cover plate and a base, wherein the cover plate comprises a K frequency band interface part and a resonant cavity; the base comprises an orthogonal mode coupler, a step transition piece and a Ka frequency band interface piece; one end of the resonant cavity is connected with the K frequency band interface piece; the other end of the resonant cavity is connected with one end of the step transition piece; the other end of the step transition piece is connected with a first electrical port of the orthogonal mode coupler; a common port of the orthogonal mode coupler is connected with an antenna; and the second electrical port of the orthogonal mode coupler is connected with the Ka frequency band interface piece. The utility model discloses a polarization separation of K frequency channel horizontal polarization signal and Ka frequency channel vertical polarization signal is realized with the mode of quadrature to the orthomode coupler to realize the isolation of different signals, with the normal work of each different signal homoenergetic of assurance. And the cover plate and the base of the duplexer may be part of a communication device, that is: the duplexer and the communication equipment adopt an integrated design, so that the processing and the assembly are more convenient, and the resonance problem caused by gaps among the waveguides can be reduced, thereby realizing the balance among performance, volume and cost.
Drawings
Fig. 1 is a schematic connection diagram of a duplexer according to an embodiment of the present invention;
fig. 2A is a schematic diagram illustrating a separated state of a cover plate and a base of a duplexer according to an embodiment of the present invention;
fig. 2B is a schematic structural diagram of a duplexer with a PCB according to an embodiment of the present invention;
fig. 2C is a schematic diagram of a hardware structure of a duplexer according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a simulation result of the S parameter between the input/output port of the K-band interface component and the common port of the orthomode coupler according to the embodiment of the present invention;
fig. 4 is a schematic diagram of a simulation result of the S parameter between the common port of the orthomode coupler and the input/output port of the Ka band interface according to the embodiment of the present invention;
fig. 5 is a schematic diagram of a simulation result of an isolation between an input/output port of the K-band interface and an input/output port of the Ka-band interface according to an embodiment of the present invention.
Description of reference numerals:
10-a cover plate; 20-a base; a 101-K frequency band interface; 102-a resonant cavity; 201-an orthogonal mode coupler; 202-a step transition piece; 203-Ka frequency band interface parts; an input/output port of the 1011-K band interface; 1021-a capacitive diaphragm filter; 2011-a common port of the quadrature mode coupler; 2012-a first electrical port of the quadrature mode coupler; 2013-a second electrical port of the quadrature-mode coupler; 2014-short circuit surface; 2015-coupling window; 2031-an input/output port of the Ka band interface.
Detailed Description
The various features and embodiments described in the embodiments may be combined in any suitable manner, for example, different embodiments may be formed by combining different features/embodiments, and in order to avoid unnecessary repetition, various possible combinations of features/embodiments in the present invention will not be described in detail.
In the description that follows, references to the terms "first", "second", and the like, are intended only to distinguish similar objects and not to indicate a particular ordering for the objects, it being understood that "first", "second", and the like may be interchanged under certain circumstances or sequences of events to enable embodiments of the invention described herein to be practiced in other than the order illustrated or described herein.
It should be understood that the references to "above" and "below" are to be interpreted as referring to the orientation during normal use.
It should be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
For the convenience of understanding the present invention, the related art of the duplexer will be briefly described first.
The dual-polarized antenna is a novel antenna technology, comprises vertical polarization and horizontal polarization, combines two pairs of antennas with orthogonal polarization directions of +45 degrees and-45 degrees, and can work in a receiving-transmitting duplex mode simultaneously. The polarization of the antenna refers to the electric field intensity direction formed when the antenna radiates; the vertical polarization refers to the direction perpendicular to the ground in the electric field intensity direction, and the electromagnetic wave at this time can be called a vertical polarization wave, for example, a vertical polarization electromagnetic wave in the Ka band; the horizontal polarization refers to the direction of the electric field intensity parallel to the ground, and the electromagnetic wave in this case can be called a horizontal wave, for example, a horizontal polarized electromagnetic wave in the K band.
When the communication device needs to implement a transceiving common function, a dual-polarized antenna is usually adopted. The duplexer is a key element for realizing the transceiving common function in the dual-polarized antenna.
A duplexer, also called an antenna duplexer, is a special two-way three-terminal filter, which can isolate the transmitting signal from the receiving signal, and ensure the normal operation of the complementary interference of the transmitting function and the receiving function. Specifically, the duplexer couples both a weak received signal into the communication device and a higher power transmitted signal from the communication device to the antenna, and ensures that the two processes each perform their functions without affecting each other.
With the rapid development of mobile communication, more and more communication devices have a transceiving function, and therefore, the application of dual polarized antennas having the transceiving function is more and more extensive, so that the use of a duplexer is more and more important, however, the current duplexer cannot achieve the balance among performance, volume and cost.
Based on this, the utility model provides a duplexer, not only the performance is high, the cost of manufacture is low, and is more miniaturized moreover, can realize the polarization separation of received signal and transmitted signal to realize the isolation of signal in the different transmission course, with the respective normal work of assurance different transmission courses.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, it shows a schematic structural diagram of a duplexer, which includes: a cover plate 10 and a base plate 20, wherein,
the cover plate 10 comprises a K-band interface 101 and a resonant cavity 102; the base 20 comprises an orthogonal mode coupler 201, a step transition piece 202 and a Ka frequency band interface piece 203;
one end of the resonant cavity 102 is connected with the K-band interface 101; the other end of the resonant cavity 102 is connected with one end of the step transition piece 202;
the other end of the step transition 202 is connected to the first electrical port 2012 of the quadrature mode coupler 201; the common port 2011 of the quadrature mode coupler 201 is connected with an antenna; the second electrical port 2013 of the quadrature-mode coupler 202 is connected to the Ka-band interface 203.
It should be noted that fig. 1 is only a schematic representation of the connection and position structures of the elements in the duplexer provided by the present invention, and is not the actual structure of the elements in the duplexer, therefore, the elements of the duplexer illustrated in fig. 1 do not need to be limited by the present invention.
In the practical application process, the cover plate 10 and the base 20 can be integrally designed with the housing of the communication device, so that the duplexer and the communication device are integrated, the processing is convenient, and no additional assembly operation is required. The design can also solve the problem of in-band resonance caused by the gap in the waveguide, thereby integrally improving the performance of the communication equipment.
It should be noted that the communication device may be a satellite communication device, such as an outdoor Unit (ODU), which is a terrestrial satellite communication device and includes a microwave transmitting module and a receiving module, and the function of the communication device is to implement communication between a satellite in the Ka band and a ground station; for another example, an indoor Unit (IDU) is an indoor modem Unit, which includes a baseband and an intermediate frequency (transceiver), and has the functions of demodulating and digitizing a received signal to decompose a desired signal, and modulating a signal to be transmitted into a signal that can be transmitted.
It should be noted that the K-band interface 101, the resonant cavity 102, the step transition piece 202, and the orthogonal mode coupler 201 form a K-band horizontal polarization channel; the orthogonal mode coupler 201 and the Ka frequency band interface piece 203 form a Ka frequency band vertical polarization channel.
It should be noted that the K-band interface 101 is provided with a K-band horizontally polarized waveguide, and the K-band interface 101 transmits a K-band horizontally polarized signal through an input/output port 1011 of the K-band interface. The resonant cavity 102 is configured to resonate frequencies of the K-band horizontally polarized signal, thereby performing a filtering function. A step transition waveguide is arranged in the step transition piece 202 and used for enabling the K-band horizontally polarized signal to be in smooth transition, and in some embodiments, in order to enable the K-band horizontally polarized signal to be in smooth transition into the resonant cavity 102, a turning waveguide is arranged on the step transition piece 202; the turning waveguide connects the step transition 202 with the resonant cavity 102.
In some embodiments, the primary function of orthogonal mode coupler 201 is to identify and provide the independent signals of two orthogonal master modes on common port 2011 to the base mode ports of two single signals of first electrical port 2012 and second electrical port 2013, respectively, to achieve separation of horizontally polarized signals and vertically polarized signals. The orthogonal mode coupler 201 has high polarization discrimination capability between two independent signals, enables a Ka frequency band vertical polarization channel to be matched with a K frequency band horizontal polarization channel, and has high isolation between orthogonal horizontal and vertical polarization channels of the two frequency bands. In practical applications, the waveguides in the orthogonal mode coupler 201 may be circular waveguides and square waveguides. The quadrature mode coupler 201 may also be connected to a feed horn. It should be noted that a K-band horizontally polarized signal is transmitted between the first electrical port 2012 and the input/output port 1011 of the K-band interface 101; ka-band vertically polarized signals are transmitted between the second electrical port 2013 and the input/output port 2031 of the Ka-band interface 203.
In some embodiments, a Ka-band vertical polarization waveguide is disposed in the Ka-band interface 203, and the Ka-band interface 203 transmits the Ka-band vertical polarization signal through the input/output port 2031 thereof.
In the practical application process, the input/output port of the K-band interface member and the input/output port of the Ka-band interface member may be rectangular structures; and the common port of the orthogonal mode coupler is in a circular structure.
In some embodiments, a standard rectangular waveguide of 10.67mm by 4.32mm is used in the input/output port of the K-band interface, which may also be referred to as: BJ 220; the input and output ports of the Ka-band interface piece adopt 7.112mm 3.556mm standard rectangular waveguides, which can also be called as: BJ 320; the common port of the orthogonal mode coupler adopts a non-standard circular waveguide with the diameter of 11.2 mm. Wherein mm is length unit, millimeter.
In some embodiments, a short-circuit surface 2014 is disposed on the orthogonal mode coupler; the position and the size of the short-circuit surface 2014 are adjustable.
As the performance index of the duplexer is required to be higher and higher, in order to design a duplexer with a smaller size and good performance, the short-circuit surface 2014 is provided on the orthogonal-mode coupler 201, and the insertion loss and the standing wave performance of the orthogonal-mode coupler 201 can be adjusted by adjusting the position and the size of the short-circuit surface.
In some embodiments, a coupling window 2015 is disposed on the quadrature-mode coupler 201; the coupling window 2015 is adjustable in both position and size.
It should be noted that the coupling window 2015 is a coupling window on the K-band horizontal polarization channel, and the position of the coupling window is crucial to adjusting the standing wave adjustment of the Ka-band vertical polarization port (i.e., the second electrical port of the orthomode coupler) and the K-band horizontal polarization port (i.e., the first electrical port of the orthomode coupler), and a proper position must be selected to ensure that the straight channel (i.e., the Ka-band vertical polarization channel) does not have high-order mode resonance in the operating frequency band. And by adjusting the position and size of the coupling window 2015, the center frequency, insertion loss, and standing wave performance of the pass band of the K-band horizontally polarized signal can be adjusted.
In a practical application process, the short-circuit surface 2014 and the coupling window 2015 may be simultaneously set in the orthogonal mode coupler 201, and the short-circuit surface 2014 and the coupling window 2015 are used in cooperation, so as to better transmit the K-band horizontally polarized signal from the first electrical port of the orthogonal mode coupler 201 to the input/output port 1011 of the Ka-band interface.
In some embodiments, a capacitive diaphragm filter 1021 is disposed in the resonant cavity 102.
It should be noted that the capacitive diaphragm filter 1021 can suppress out-of-band higher harmonics of a K-band horizontally polarized signal, has good out-of-band suppression at a frequency of 1.5 times of a passband, and can effectively improve isolation from a Ka-band vertically polarized signal in the Ka-band interface component 203. In the practical application process, the generation of high-order modes in the horizontal polarization signal of the K frequency band can be reduced by changing the height and the depth of each cavity in the resonant cavity, the harmonic suppression at the frequency doubling position of 1.5 is achieved, and the isolation degree of the vertical polarization signal of the Ka frequency band in the Ka frequency band interface piece 203 is improved. In addition, by adjusting the size and position of the capacitive diaphragm filter 1021, the center frequency of the pass band of the K-band horizontally polarized signal, the insertion loss, the standing wave performance, and the out-of-band rejection of the Ka-band vertically polarized signal can be adjusted.
In some embodiments, the diplexer is provided with draft angles.
It should be noted that, the design of the duplexer is added with the draft angle, so that the duplexer is easy to open the mold for mass production, and does not need to be assembled, thereby improving the working efficiency.
In some embodiments, a Printed Circuit Board (PCB) is disposed between the cover plate and the base. It should be noted that, a PCB is disposed between the cover plate 10 and the base 20, so that the input/output port 1011 of the K-band interface and the input/output port of the Ka-band interface are on the same plane.
In some embodiments, the transmission directions of the K-band horizontally polarized signals of the resonant cavity are respectively perpendicular to a first plane where a common port of the orthomode coupler is located, a second plane where an input/output port of the K-band interface member is located, and a third plane where an input/output port of the Ka-band interface member is located; and a first plane where a common port of the orthogonal mode coupler is positioned is respectively vertical to a second plane where an input/output port of the K-band interface piece is positioned and a third plane where an input/output port of the Ka-band interface piece is positioned.
It should be noted that, the arrangement is used to ensure that the signal transmission direction of the resonant cavity is perpendicular to the planes of the common port of the orthogonal mode coupler, the input/output port of the K-band interface and the input/output port of the Ka-band interface, respectively. Wherein, "first", "second", "third" in first plane, second plane and the third plane is only for the description and distinguish the convenience, does not serve as the restriction the utility model discloses.
In some embodiments, the communications device comprises a duplexer as in any preceding claim.
The embodiment of the utility model provides a be fit for being applied to and combined ODU and IDU Ka frequency channel signal transceiver as an organic whole. In this transceiver, receive noise figure, transmitting power, receiving and dispatching isolation are more critical index, the embodiment of the utility model provides a duplexer is located between radio frequency front end and the antenna, and its transmitting frequency just in time locates at receiving frequency 1.5 times, so high performance, low cost, miniaturized duplexer meaning are just very important, the embodiment of the utility model provides a duplexer just in time has these characteristics.
For better understanding of the present invention, as shown in fig. 2A-2C, fig. 2A is a schematic diagram illustrating a state where a cover plate and a base of a duplexer provided by an embodiment of the present invention are separated from each other; fig. 2B illustrates a schematic structural view of a duplexer having a PCB; fig. 2C shows a hardware configuration diagram of a duplexer.
In fig. 2A-2C, for the processing of the physical duplexer, the duplexer can adopt an integrated design with the housing of the communication device, is easy to process, and can solve the resonance problem caused by the slot in the waveguide. In addition, the duplexer is additionally provided with the draft angle during design, so that the mold opening batch production is easy, the assembly is not needed, the assembly efficiency is improved, and the balance among the performance, the volume and the cost is realized.
The overall size of the duplexer can be 43mm multiplied by 50mm multiplied by 29mm, and the miniaturization effect is achieved for the whole satellite communication equipment.
As shown in figures 2A-2B: the duplexer is divided into two parts, a cover 10, which may be a receiving cover of a satellite communication device, including: a resonant cavity 102 and a K-band interface 101, wherein a capacitive diaphragm filter can be disposed in the resonant cavity 102, that is: the capacitive coupling waveguide filter is used for filtering the horizontal polarization signals of the K frequency band; the K-band interface 101 includes an input/output port 1011 of the K-band interface 101 for receiving and transmitting a K-band horizontally polarized signal; the base 20, which may be a base of a satellite communication device, includes: the system comprises an orthogonal mode coupler 201, a step transition piece 202 and a Ka frequency band interface piece 203, wherein the orthogonal mode coupler 201 can be a circular waveguide orthogonal mode coupler; the step transition piece 202 may be a waveguide step transition; the input/output port 2031 of the Ka band interface 203 is configured to receive and transmit a Ka band vertically polarized signal. The PCB is disposed between the base and the cover, so that the input/output port 1011 of the K-band interface 101 and the input/output port 2031 of the Ka-band interface 203 are in the same plane.
As shown in fig. 2C: 2011 is the common port of the circular waveguide orthogonal mode coupler of the duplexer; 2031 is a K-band polarization horizontal signal input/output port, 2031 is a Ka-band polarization vertical signal input/output port; the horizontally polarized signal in 2011 and the vertically polarized signal in 2031 are orthogonally output by the waveguide position in the circular waveguide orthogonal mode coupler, so that the polarization separation function of two independent signals of an orthogonal main mode is realized.
As shown in fig. 2C: an orthogonal mode coupler 201 is a circular waveguide orthogonal mode coupler, which is designed with an orthogonal mode output rectangular waveguide port: a first electrical port 2011 and a second electrical port 2012. When the K-band horizontally-polarized waveguide section is matched, a short-circuit surface 2014 is added on the side surface of the circular waveguide orthogonal mode coupler, so that the K-band horizontally-polarized signal can be better transmitted, the position and the size of the short-circuit surface 2014 are adjusted, and the insertion loss and the standing wave performance of the circular waveguide orthogonal mode coupler can be adjusted. In addition, the position of the coupling window of the K-band horizontal polarization channel of the circular waveguide orthogonal mode coupler is important for adjusting the standing wave of the Ka-band vertical polarization port (namely, the second electric port of the orthogonal mode coupler) and the K-band horizontal polarization port (namely, the first electric port of the orthogonal mode coupler), and a proper position must be selected to ensure that the high-order mode resonance does not occur in the working frequency band of the straight channel (the Ka-band vertical polarization channel), adjust the size and the position of the coupling window, and adjust the center frequency, the insertion loss and the standing wave performance of the pass band of the K-band. Moreover, the impedance matching of the circular waveguide, the K-band horizontal polarization waveguide and the Ka-band vertical polarization waveguide can be realized by using the coupling window 2015 of the K-band horizontal polarization channel, and the selection of the size of the coupling window 2015 of the K-band horizontal polarization waveguide and the position relationship of the short circuit surface 2014 become the key design parameters. It should be noted that the short-circuit surface 2014 can also cooperate with the coupling window 2015 to better match the first electrical port, so that the K-band horizontally polarized signal is better transmitted between the first electrical port and the input/output port 1011 of the K-band interface 101.
As shown in fig. 2C: 102 is a resonant cavity; 1021 is a capacitance coupling waveguide filter, and in the practical application process, the center frequency, insertion loss and standing wave performance of the pass band of the K frequency band and the out-of-band rejection of the Ka frequency band can be adjusted by adjusting the size and position of the resonant cavity.
In the practical application process, waveguide turning is added for waveguide step transition, so that the coupling window of the horizontal polarization channel of the circular waveguide orthogonal mode coupler is better matched with the capacitive diaphragm filter. For the Ka frequency band vertical polarization waveguide, the isolation degree of signals between the Ka frequency band vertical polarization waveguide and the input/output port of the K frequency band horizontal polarization channel is improved by using the low-frequency cut-off characteristic of the waveguide, a filter is not required to be additionally added, and the insertion loss of a pass band is reduced. For the capacitive coupling waveguide filter, the generation of higher-order modes is reduced by changing the height and the depth of each cavity of the resonant cavity, the harmonic suppression at the 1.5-frequency multiplication position is achieved, and the receiving and transmitting isolation between the input and output ports 1011 and 2031 of the K-frequency band interface is improved.
In order to more intuitively show the advantages of the duplexer of the present invention, as shown in fig. 3-5, it shows the simulation result diagram of the parameter or isolation between each port obtained by the duplexer of the present invention. Fig. 3 is a diagram showing a simulation result of the S parameter between the Ka band orthomode coupler common port 2011 and the input/output port 1011 of the K band interface, and it can be seen from the diagram that the pass band is 17.1 to 20.5GHz, the insertion loss is less than 0.1dB, and the rejection is greater than 60dB in the Ka band; as shown in fig. 4: an S parameter simulation result diagram between a public port 2011 of the Ka frequency band orthogonal mode coupler and an input/output port 2031 of the Ka frequency band interface piece is shown, and it can be seen from the diagram that the pass band is 27.8-30.3 GHz, the insertion loss is less than 0.1dB, and the suppression on the K frequency band is more than 60 dB; as shown in fig. 5: a simulation result diagram of the isolation between the input/output port 1011 of the K band interface and the input/output port 2031 of the Ka band interface is shown, and it can be seen that the in-band isolation is greater than 100 dB. It should be noted that the S-parameter is a scattering parameter, including a transmission coefficient and a reflection coefficient, which are derived from a scattering matrix and used to describe signal transmission, for example, a two-port device having port 1 and port 2, then S12 is a backward transmission coefficient, S21 is a forward transmission coefficient, which represents the transmission of a signal through the two-port device, and is expressed by insertion loss (in dB), and S11 and S22 are input and output reflection coefficients, which represent the reflection of a signal when the signal passes through the two-port device, and is expressed by return loss (in dB)). In FIGS. 3-5, the abscissa represents frequency in GHz; the ordinate represents the insertion loss in dB.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A duplexer, characterized by comprising: a cover plate and a base, wherein,
the cover plate comprises a K frequency band interface part and a resonant cavity; the base comprises an orthogonal mode coupler, a step transition piece and a Ka frequency band interface piece;
one end of the resonant cavity is connected with the K frequency band interface piece; the other end of the resonant cavity is connected with one end of the step transition piece;
the other end of the step transition piece is connected with a first electrical port of the orthogonal mode coupler; a common port of the orthogonal mode coupler is connected with an antenna; and the second electrical port of the orthogonal mode coupler is connected with the Ka frequency band interface piece.
2. The duplexer of claim 1, wherein input and output ports of the K-band interface and the Ka-band interface have a rectangular structure; and the common port of the orthogonal mode coupler is in a circular structure.
3. The duplexer according to claim 1, wherein a short-circuiting surface is provided on the orthogonal mode coupler; the position and the size of the short circuit surface are both adjustable.
4. The duplexer of claim 1, wherein a capacitive diaphragm filter is disposed in the resonant cavity.
5. The duplexer of claim 1, wherein a turn waveguide is disposed on the step transition; the turn waveguide connects the step transition piece with the resonant cavity.
6. The duplexer of claim 1, wherein the duplexer is provided with draft.
7. The duplexer of claim 1, wherein the orthogonal-mode coupler is provided with a coupling window, the coupling window being adjustable in position and size.
8. The duplexer of claim 2, wherein the input/output ports of the K-band interface are rectangular waveguides of 10.67mm by 4.32 mm; the input and output ports of the Ka-band interface piece adopt 7.112 mm-3.556 mm rectangular waveguides; and the common port of the orthogonal mode coupler adopts a circular waveguide with the diameter of 11.2 mm.
9. The duplexer of claim 2, wherein transmission directions of the K-band horizontally polarized signals of the resonant cavity are respectively perpendicular to a first plane where a common port of the orthomode coupler is located, a second plane where an input/output port of the K-band interface member is located, and a third plane where an input/output port of the Ka-band interface member is located; and a first plane where a common port of the orthogonal mode coupler is positioned is respectively vertical to a second plane where an input/output port of the K-band interface piece is positioned and a third plane where an input/output port of the Ka-band interface piece is positioned.
10. A communication device, characterized in that it comprises a duplexer according to any one of claims 1 to 8.
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| CN114124243A (en) * | 2022-01-27 | 2022-03-01 | 电子科技大学 | High-isolation terahertz orthogonal mode isolation duplexer easy to machine |
| CN114335963A (en) * | 2022-03-10 | 2022-04-12 | 广州中雷电科科技有限公司 | Orthogonal mode coupler and design method |
| CN114725643A (en) * | 2022-06-10 | 2022-07-08 | 四川太赫兹通信有限公司 | Terahertz dual-mode folding multiplexer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114124243A (en) * | 2022-01-27 | 2022-03-01 | 电子科技大学 | High-isolation terahertz orthogonal mode isolation duplexer easy to machine |
| CN114124243B (en) * | 2022-01-27 | 2022-05-03 | 电子科技大学 | High-isolation terahertz orthogonal mode isolation duplexer easy to machine |
| CN114335963A (en) * | 2022-03-10 | 2022-04-12 | 广州中雷电科科技有限公司 | Orthogonal mode coupler and design method |
| CN114725643A (en) * | 2022-06-10 | 2022-07-08 | 四川太赫兹通信有限公司 | Terahertz dual-mode folding multiplexer |
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