CN115940991B - High-isolation L-band receiving and transmitting passive annular component and working method thereof - Google Patents
High-isolation L-band receiving and transmitting passive annular component and working method thereof Download PDFInfo
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- CN115940991B CN115940991B CN202310182916.2A CN202310182916A CN115940991B CN 115940991 B CN115940991 B CN 115940991B CN 202310182916 A CN202310182916 A CN 202310182916A CN 115940991 B CN115940991 B CN 115940991B
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Abstract
The invention provides a high-isolation L-band receiving and transmitting passive annular component and a working method thereof, wherein the high-isolation L-band receiving and transmitting passive annular component comprises a transmitting synthetic network, a receiving synthetic network and a transmitting leakage cancellation network, wherein the transmitting synthetic network is composed of a plurality of bridges, circulators and/or 180-degree phase shifters; wherein the partial bridge, circulator and/or 180 DEG phase shifter are multiplexed in a transmit combining network, a receive combining network and a transmit leakage cancellation network. The invention can realize normal signal receiving while the L-band communication equipment transmits signals.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a high-isolation L-band receiving and transmitting passive annular component and a working method thereof.
Background
High power communication devices operating at L-band frequencies often communicate with each other using half duplex (time division multiple access) operation. When the communication transmitter transmits signals, the receiving channel is disconnected by adopting a receiving and transmitting isolating switch (more than 40 dB) in the receiver due to larger transmitting power (the signal power is more than 100W), so that the signal of the receiving channel is prevented from being saturated or even the receiver is burnt out due to the fact that the transmitting signals leak to the receiving channel. This requires that the communication device must employ half duplex operation, i.e. turn off or switch off the receiver during transmission. The method is simple and easy to operate, but the communication equipment cannot normally receive signals during transmitting, so that time resources are wasted; this time waste is even greater and intolerable when multiple communication devices are networked.
Therefore, the L-band receiving and transmitting passive annular component of the communication equipment needs to be innovatively designed, the isolation of a receiving channel is improved, the purpose that a receiving channel is not closed when a communication transmitter transmits high-power signals, the transmitted signals leaked to the receiving channel are restrained from being attenuated by more than 40dB, and the signal saturation of the receiving channel is avoided is achieved. At present, no relevant literature report and data for normally receiving signals at the same time when L-band high-power communication equipment transmits signals at home and abroad exist.
Disclosure of Invention
The invention aims to provide a high-isolation L-band receiving and transmitting passive annular component and a working method thereof, so that signals can be normally received while the L-band communication equipment transmits the signals.
The invention provides a high-isolation L-band receiving and transmitting passive annular component, which comprises a transmitting synthetic network, a receiving synthetic network and a transmitting leakage cancellation network; the transmission synthesis network, the receiving synthesis network and the transmission leakage cancellation network all comprise a plurality of bridges, circulators and/or 180-degree phase shifters; wherein a plurality of bridges, circulators and/or 180 DEG phase shifters are multiplexed in a transmit combining network, a receive combining network and a transmit leakage cancellation network.
Further, the emission synthesis network comprises a first bridge, a second bridge, a first circulator, a second circulator and a 180-degree phase shifter; the port I of the bridge I is a transmitting input end, the port II of the bridge I is grounded, the port III of the bridge I is connected with the port I of the circulator I, and the port IV of the bridge I is connected with the port I of the circulator II; the port II of the circulator I is connected with the port I of the bridge II; the port II of the circulator II is connected with the port II of the bridge II through a 180-degree phase shifter; the port three of the bridge two is connected with the antenna, and the port four of the bridge two is grounded.
Further, the receiving synthesis network comprises a second bridge, a third bridge, a first circulator, a second circulator and a 180-degree phase shifter; the port III of the circulator I is connected with the port II of the bridge III; the port III of the circulator II is connected with the port I of the bridge III; the port three of the bridge three is grounded, and the port four of the bridge three is a receiving output end.
Further, the transmission leakage cancellation network comprises a first bridge, a third bridge, a first circulator and a second circulator.
Further, the working method of the high-isolation L-band transceiving passive annular component comprises the following steps:
transmitting, synthesizing and outputting through a transmitting and synthesizing network;
receiving the synthesized output through a receiving synthesis network;
and performing transmission leakage signal cancellation through a transmission leakage cancellation network.
Further, the process of transmitting the synthesized output through the synthesized transmission network includes:
the transmitting input end inputs a transmitting signal to the first bridge through the first port of the first bridge;
the first electric bridge divides the power of the transmitting signal into two paths, and at the moment, the second path of transmitting signal output by the fourth port of the first electric bridge is compared with the first path of transmitting signal output by the third port, the amplitude is the same, and the phase is lagged by 90 degrees;
the first path of transmitting signals reach the port I of the bridge II after passing through the circulator I, the second path of transmitting signals reach the port II of the bridge II after passing through the circulator II and the 180-degree phase shifter in sequence, and the second path of transmitting signals are compared with the first path of transmitting signals, and have the same amplitude and 270-degree phase lag;
the second path of transmitting signals and the second path of transmitting signals are synthesized by the second bridge and then output by the third port of the second bridge, the phase difference is 360 degrees, the right amplitude is added, and the transmitting energy loss is avoided.
Further, the process of receiving the synthesized output through the receiving synthesis network includes:
the antenna input receiving signal is input into the bridge II through a port three of the bridge II;
the second bridge divides the received signal power into two paths, and at the moment, the second path of received signal output by the second port of the second bridge is compared with the first path of received signal output by the first port, the amplitude is the same, and the phase is delayed by 90 degrees;
the first path of receiving signals reaches a port II of the bridge III after passing through the circulator I, and the second path of receiving signals reaches a port I of the bridge III after passing through the 180-degree phase shifter and the circulator II in sequence; at this time, the second path of receiving signal is compared with the first path of receiving signal, the amplitude is the same, and the phase lag is 270 degrees;
the third bridge synthesizes the first path of received signals and the second path of received signals and then outputs the signals through the fourth port of the third bridge, the phase difference is 360 degrees, the amplitudes are exactly added, and the received energy loss is avoided.
Further, the process of performing transmit leakage signal cancellation through the transmit leakage cancellation network includes:
after the first transmission signal power is divided into two paths by the bridge, a first path of transmission leakage signal generated by the circulator directly reaches a second port of the bridge, a second path of transmission leakage signal generated by the circulator directly reaches the first port of the bridge, and at the moment, the second path of transmission leakage signal is compared with the first path of transmission leakage signal, the amplitude is the same, and the phase is delayed by 90 degrees;
and the third path of emission leakage signals and the second path of emission leakage signals are synthesized and then output by the fourth port of the third path of emission leakage signals, the phase difference is 180 degrees, the right amplitude is subtracted, and the cancellation of the emission leakage signals is realized.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. the invention integrates the transmitting synthesis network, the receiving synthesis network and the transmitting leakage cancellation network into a passive annular component, skillfully utilizes the leakage signals of the two circulators and the phase shift characteristic of the four-port bridge to realize the transmitting signal synthesis cancellation of the leakage to the receiving channel, ensures that the L-band high-power communication equipment can normally receive signals transmitted by other communication equipment while transmitting signals, and realizes the full duplex operation of the receiving and transmitting links of the communication equipment. The working mode avoids the defect that the L-band high-power communication equipment cannot normally receive signals when transmitting the signals; particularly, when the multi-equipment networking works, the time resource can be fully utilized.
2. The invention has the characteristics of simplicity, convenience and practicability, and the passive annular component multiplexes a plurality of components of the transmitting synthesis network, the receiving synthesis network and the transmitting leakage cancellation network, thereby realizing respective functions.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly describe the drawings in the embodiments, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of the composition of an L-band communication system.
Fig. 2 is a schematic diagram of the components of a high-isolation L-band transceiver passive ring component according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of the composition of a transmit synthesis network in an embodiment of the invention.
Fig. 4 is a schematic diagram of the composition of a receiving composite network according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of the composition of a transmission leakage cancellation network according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a transceiver structure based on a circulator according to an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
As shown in fig. 1, the L-band communication system is composed of a plurality of communication apparatuses which communicate with each other by time division multiple access. When the transmitting extension of the communication equipment works, the receiving channel needs to be disconnected due to the fact that the transmitting power is larger (the signal power is not smaller than 100W), and the components of the receiving channel are guaranteed not to be blocked or burnt by the transmitting leakage signal. At the actual moment, the receiving channel of the communication equipment is in an inactive state, so that signals cannot be received normally, and time resource waste is caused; this time waste is even greater and intolerable when multiple communication devices are networked. Thus, as shown in fig. 2, the present embodiment proposes a high-isolation L-band transceiver passive ring component, including a transmit combining network, a receive combining network, and a transmit leakage cancellation network; the transmission synthesis network, the receiving synthesis network and the transmission leakage cancellation network all comprise a plurality of bridges, circulators and/or 180-degree phase shifters; wherein a plurality of bridges, circulators and/or 180 DEG phase shifters are multiplexed in a transmit combining network, a receive combining network and a transmit leakage cancellation network. The working method of the high-isolation L-band transceiving passive annular component comprises the following steps:
transmitting, synthesizing and outputting through a transmitting and synthesizing network;
receiving the synthesized output through a receiving synthesis network;
and performing transmission leakage signal cancellation through a transmission leakage cancellation network.
Specifically:
as shown in fig. 3, the emission synthesis network includes a first bridge, a second bridge, a first circulator, a second circulator and a 180 ° phase shifter; the port I of the bridge I is a transmitting input end, the port II of the bridge I is grounded, the port III of the bridge I is connected with the port I of the circulator I, and the port IV of the bridge I is connected with the port I of the circulator II; the port II of the circulator I is connected with the port I of the bridge II; the port II of the circulator II is connected with the port II of the bridge II through a 180-degree phase shifter; the port three of the bridge two is connected with the antenna, and the port four of the bridge two is grounded. Thus, the process of transmitting a composite output over a transmit composite network includes:
the transmitting input end inputs a transmitting signal to the first bridge through the first port of the first bridge;
the first electric bridge divides the power of the transmitting signal into two paths, and at the moment, the second path of transmitting signal output by the fourth port of the first electric bridge is compared with the first path of transmitting signal output by the third port, the amplitude is the same, and the phase is lagged by 90 degrees;
the first path of transmitting signals reach the port I of the bridge II after passing through the circulator I, the second path of transmitting signals reach the port II of the bridge II after passing through the circulator II and the 180-degree phase shifter in sequence, and the second path of transmitting signals are compared with the first path of transmitting signals, and have the same amplitude and 270-degree phase lag;
the second path of transmitting signals and the second path of transmitting signals are synthesized by the second bridge and then output by the third port of the second bridge, the phase difference is 360 degrees, the right amplitude is added, and the transmitting energy loss is avoided.
As shown in fig. 4, the receiving and synthesizing network comprises a second bridge, a third bridge, a first circulator, a second circulator and a 180-degree phase shifter; the port III of the circulator I is connected with the port II of the bridge III; the port III of the circulator II is connected with the port I of the bridge III; the port three of the bridge three is grounded, and the port four of the bridge three is a receiving output end. Thus, the process of receiving the composite output over the receive composite network includes:
the antenna input receiving signal is input into the bridge II through a port three of the bridge II;
the second bridge divides the received signal power into two paths, and at the moment, the second path of received signal output by the second port of the second bridge is compared with the first path of received signal output by the first port, the amplitude is the same, and the phase is delayed by 90 degrees;
the first path of receiving signals reaches a port II of the bridge III after passing through the circulator I, and the second path of receiving signals reaches a port I of the bridge III after passing through the 180-degree phase shifter and the circulator II in sequence; at this time, the second path of receiving signal is compared with the first path of receiving signal, the amplitude is the same, and the phase lag is 270 degrees;
the third bridge synthesizes the first path of received signals and the second path of received signals and then outputs the signals through the fourth port of the third bridge, the phase difference is 360 degrees, the amplitudes are exactly added, and the received energy loss is avoided.
As shown in fig. 5, the transmission leakage cancellation network includes a first bridge, a third bridge, a first circulator and a second circulator. Thus, the process of transmit leakage signal cancellation through the transmit leakage cancellation network comprises:
after the first transmission signal power is divided into two paths by the bridge, a first path of transmission leakage signal generated by the circulator directly reaches a second port of the bridge, a second path of transmission leakage signal generated by the circulator directly reaches the first port of the bridge, and at the moment, the second path of transmission leakage signal is compared with the first path of transmission leakage signal, the amplitude is the same, and the phase is delayed by 90 degrees;
and the third path of emission leakage signals and the second path of emission leakage signals are synthesized and then output by the fourth port of the third path of emission leakage signals, the phase difference is 180 degrees, the right amplitude is subtracted, and the cancellation of the emission leakage signals is realized. The isolation of the L-band circulator is generally 20dB, and the isolation of the actual test emission leakage from 960MHz to 1250MHz can reach more than 42dB under the influence of the phase and amplitude consistency of the bridge and the circulator.
When the signal power of the transmitted signal reaches 100W (50 dBmW), it is radiated from the antenna through the circulator as shown in fig. 6; since the isolation of the circulator is 20dB, the power of the transmitted signal leaked to the receiving output terminal reaches 30 dBmW, which will cause saturation or burnout of the low noise amplifier at the receiving output terminal (the maximum input signal of the L-band low noise amplifier does not exceed 20 dBmW). And the transmitted signal is radiated from the antenna through the high-isolation L-band receiving and transmitting passive annular component shown in fig. 2, and the signal power of the transmitted signal leaked to the receiving output end is 8dBmW as the component isolation reaches 42dB, so that the maximum input signal power of the low-noise amplifier is not exceeded, the normal operation of a receiving channel can be ensured, and the receiving and transmitting full duplex operation of the communication equipment is realized.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The high-isolation L-band receiving and transmitting passive annular component is characterized by comprising a transmitting synthetic network, a receiving synthetic network and a transmitting leakage cancellation network; the transmission synthesis network, the receiving synthesis network and the transmission leakage cancellation network all comprise a plurality of bridges, circulators and/or 180-degree phase shifters; wherein, a plurality of bridges, circulators and/or 180 DEG phase shifters are multiplexed in a transmitting synthetic network, a receiving synthetic network and a transmitting leakage cancellation network;
the emission synthesis network comprises a first bridge, a second bridge, a first circulator, a second circulator and a 180-degree phase shifter; the port I of the bridge I is a transmitting input end, the port II of the bridge I is grounded, the port III of the bridge I is connected with the port I of the circulator I, and the port IV of the bridge I is connected with the port I of the circulator II; the port II of the circulator I is connected with the port I of the bridge II; the port II of the circulator II is connected with the port II of the bridge II through a 180-degree phase shifter; the port III of the bridge II is connected with the antenna, and the port IV of the bridge II is grounded;
the receiving synthesis network comprises a second bridge, a third bridge, a first circulator, a second circulator and a 180-degree phase shifter; the port III of the circulator I is connected with the port II of the bridge III; the port III of the circulator II is connected with the port I of the bridge III; the port III of the bridge III is grounded, and the port IV of the bridge III is a receiving output end;
the transmission leakage cancellation network includes a first bridge, a third bridge, a first circulator and a second circulator.
2. A method of operating a high isolation L-band transceiver passive loop assembly as claimed in claim 1, comprising:
transmitting, synthesizing and outputting through a transmitting and synthesizing network;
receiving the synthesized output through a receiving synthesis network;
and performing transmission leakage signal cancellation through a transmission leakage cancellation network.
3. The method of operating a high isolation L-band transceiver passive loop assembly of claim 2, wherein said process of transmitting composite output through a transmit composite network comprises:
the transmitting input end inputs a transmitting signal to the first bridge through the first port of the first bridge;
the first electric bridge divides the power of the transmitting signal into two paths, and at the moment, the second path of transmitting signal output by the fourth port of the first electric bridge is compared with the first path of transmitting signal output by the third port, the amplitude is the same, and the phase is lagged by 90 degrees;
the first path of transmitting signals reach the port I of the bridge II after passing through the circulator I, the second path of transmitting signals reach the port II of the bridge II after passing through the circulator II and the 180-degree phase shifter in sequence, and the second path of transmitting signals are compared with the first path of transmitting signals, and have the same amplitude and 270-degree phase lag;
the second path of transmitting signals and the second path of transmitting signals are synthesized by the second bridge and then output by the third port of the second bridge, the phase difference is 360 degrees, the right amplitude is added, and the transmitting energy loss is avoided.
4. The method of operating a high isolation L-band transceiver passive loop assembly of claim 3 wherein said receiving composite output via a receive composite network comprises:
the antenna input receiving signal is input into the bridge II through a port three of the bridge II;
the second bridge divides the received signal power into two paths, and at the moment, the second path of received signal output by the second port of the second bridge is compared with the first path of received signal output by the first port, the amplitude is the same, and the phase is delayed by 90 degrees;
the first path of receiving signals reaches a port II of the bridge III after passing through the circulator I, and the second path of receiving signals reaches a port I of the bridge III after passing through the 180-degree phase shifter and the circulator II in sequence; at this time, the second path of receiving signal is compared with the first path of receiving signal, the amplitude is the same, and the phase lag is 270 degrees;
the third bridge synthesizes the first path of received signals and the second path of received signals and then outputs the signals through the fourth port of the third bridge, the phase difference is 360 degrees, the amplitudes are exactly added, and the received energy loss is avoided.
5. The method of claim 4, wherein the step of performing transmit leakage signal cancellation through the transmit leakage cancellation network comprises:
after the first transmission signal power is divided into two paths by the bridge, a first path of transmission leakage signal generated by the circulator directly reaches a second port of the bridge, a second path of transmission leakage signal generated by the circulator directly reaches the first port of the bridge, and at the moment, the second path of transmission leakage signal is compared with the first path of transmission leakage signal, the amplitude is the same, and the phase is delayed by 90 degrees;
and the third path of emission leakage signals and the second path of emission leakage signals are synthesized and then output by the fourth port of the third path of emission leakage signals, the phase difference is 180 degrees, the right amplitude is subtracted, and the cancellation of the emission leakage signals is realized.
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