CN117498806A - Up-down conversion implementation method based on absorption filter and filter - Google Patents
Up-down conversion implementation method based on absorption filter and filter Download PDFInfo
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- CN117498806A CN117498806A CN202311848338.8A CN202311848338A CN117498806A CN 117498806 A CN117498806 A CN 117498806A CN 202311848338 A CN202311848338 A CN 202311848338A CN 117498806 A CN117498806 A CN 117498806A
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 50
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The invention discloses an up-down conversion implementation method based on an absorption filter and the filter. The invention adopts an absorption filter, the filter adopts a double-branch structure and is respectively composed of two 90-degree bridges, two reflection filters and two absorption loads, and in the mode, reflected wave signals at the input end and the output end of the two reflection filters are acted by the 90-degree bridges to generate two paths of reflected wave signals with equal amplitude and opposite directions, and the signals are synthesized and absorbed by the absorption loads of the 90-degree bridges.
Description
Technical Field
The invention relates to the technical field of electronic communication, in particular to an up-down conversion realization method based on an absorption filter and the filter.
Background
The up-down conversion technology is a key core technology in modern electronic communication systems such as microwave/millimeter wave communication, radar, electronic countermeasure, remote sensing and the like, and the performance of an application system plays a crucial role. The prior up-down conversion technology implementation method comprises a receiving and transmitting switch, a reflective filter and a mixer. The in-band amplitude is larger passively, the filter port out-of-band presents reflection characteristics, the filter port is cascaded with a mixer, the filter port cannot be well matched with the mixer, and load traction is carried out, so that in-band amplitude fluctuation is larger.
In view of the above, the present invention provides a method for implementing up-down conversion based on an absorption filter with excellent reflected wave absorption characteristics, and a filter.
Disclosure of Invention
The invention provides an up-down conversion implementation method based on an absorption filter and the filter, wherein the up-down conversion implementation method has excellent reflection wave absorption characteristics.
The invention aims to provide an implementation method of up-down frequency conversion based on an absorption filter, which comprises the following steps:
when the receiving and transmitting switch receives a control signal, the control circuit controls the state of the switch chip according to the content of the signal, a plurality of input ports and one output port of the switch chip are connected through a microwave lead, when the switch chip is in a certain state, the signal of the input port is transmitted to the output port, so that the output of the signal is realized, and when the starting signal is changed, the state of the switch chip is correspondingly changed, so that different input ports are selected to be connected to the output port, and the switching function of a receiving branch and a transmitting branch is realized;
and step two, the in-band signals generate two paths of signals with equal amplitude and 90 DEG phase difference through the action of a 90 DEG bridge in the absorption filter, the signals remain unchanged after passing through two identical reflection filters, and the signals with equal amplitude and the same phase are synthesized through the action of the 90 DEG bridge. The signals outside the passband are subjected to 90-degree bridge action in the absorption filter to generate two paths of signals with equal amplitude and 90-degree phase difference, the signals are transmitted by two identical reflection filters and are kept unchanged, and the signals with equal amplitude and opposite phase are synthesized through the 90-degree bridge action to absorb the counteracted signals through the absorption load. The in-band signal is purer, and the absorption characteristic is provided outside the band;
and thirdly, performing balanced modulation on the input signal and the local oscillation signal through a mixer to complete frequency conversion, performing up-conversion to complete frequency conversion from an intermediate frequency to a radio frequency, and performing down-conversion to complete frequency conversion from the radio frequency to the intermediate frequency.
A filter is applied to a step two in an implementation method of up-down frequency conversion based on an absorption filter, the filter is the absorption filter, the absorption filter comprises two 90-degree bridges, two reflection filters and two absorption loads, the two 90-degree bridges are connected in series with the two reflection filters, the two absorption loads are connected in series with the two 90-degree bridges, the reflection filters are connected in parallel by a resonant capacitor and a resonant inductor to form a resonant cavity, and then are connected in series with a coupling capacitor.
The invention has the following advantages: the invention adopts an absorption filter, the filter adopts a double-branch structure and is respectively composed of two 90-degree bridges, two reflection filters and two absorption loads, and in the mode, reflected wave signals at the input end and the output end of the two reflection filters are acted by the 90-degree bridges to generate two paths of reflected wave signals with equal amplitude and opposite directions, and the signals are synthesized and absorbed by the absorption loads of the 90-degree bridges. The invention adopts the up-down conversion technology of the absorption filter, has excellent reflection wave absorption characteristic in a broadband range, can lead the filter to be better matched with the mixer, and has better amplitude fluctuation characteristic.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic diagram of an absorptive filter circuit of the present invention;
FIG. 3 is a graph of an absorption filter simulation of the present invention;
FIG. 4 is a graph of in-band amplitude fluctuation simulation of the present invention;
FIG. 5 is a graph of the in-band signal phase relationship of the present invention;
fig. 6 is a graph of the phase relationship of signals outside the passband of the present invention.
Detailed Description
The invention provides an implementation method of up-down frequency conversion based on an absorption filter, which comprises the following steps:
when the receiving and transmitting switch receives a control signal, the control circuit controls the state of the switch chip according to the content of the signal, a plurality of input ports and one output port of the switch chip are connected through a microwave lead, when the switch chip is in a certain state, the signal of the input port is transmitted to the output port, so that the output of the signal is realized, and when the starting signal is changed, the state of the switch chip is correspondingly changed, so that different input ports are selected to be connected to the output port, and the switching function of a receiving branch and a transmitting branch is realized;
and step two, the in-band signals generate two paths of signals with equal amplitude and 90 DEG phase difference through the action of a 90 DEG bridge in the absorption filter, the signals remain unchanged after passing through two identical reflection filters, and the signals with equal amplitude and the same phase are synthesized through the action of the 90 DEG bridge. The signals outside the passband are subjected to 90-degree bridge action in the absorption filter to generate two paths of signals with equal amplitude and 90-degree phase difference, the signals are transmitted by two identical reflection filters and are kept unchanged, and the signals with equal amplitude and opposite phase are synthesized through the 90-degree bridge action to absorb the counteracted signals through the absorption load. The in-band signal is purer, and the absorption characteristic is provided outside the band;
and thirdly, performing balanced modulation on the input signal and the local oscillation signal through a mixer to complete frequency conversion, performing up-conversion to complete frequency conversion from an intermediate frequency to a radio frequency, and performing down-conversion to complete frequency conversion from the radio frequency to the intermediate frequency.
A filter is applied to a step two in an implementation method of up-down frequency conversion based on an absorption filter, the filter is the absorption filter, the absorption filter comprises two 90-degree bridges, two reflection filters and two absorption loads, the two 90-degree bridges are connected in series with the two reflection filters, the two absorption loads are connected in series with the two 90-degree bridges, the reflection filters are connected in parallel by a resonant capacitor and a resonant inductor to form a resonant cavity, and then are connected in series with a coupling capacitor.
In this embodiment, as shown in fig. 1, the switching function of the receiving branch and the transmitting branch is implemented through the transceiver switch, the absorption filter filters the up-down frequency conversion out-of-band interference signal, so that the in-band signal is purer, the out-of-band signal has absorption characteristics, the front-stage device and the rear-stage device can be well matched, the mixer completes the frequency conversion function, the up-conversion completes the frequency switching from the intermediate frequency to the radio frequency, and the down-conversion completes the frequency switching from the radio frequency to the intermediate frequency.
In this embodiment, as shown in fig. 2, the reflected wave signals from the input and output ends of the two reflective filters act through a 90 ° bridge, so as to generate two paths of reflected wave signals with equal amplitude and opposite directions, and the reflected wave signals are absorbed by the absorption load of the 90 ° bridge.
In this embodiment, as shown in fig. 3, the return loss of the absorption filter in the stop band of 4 ghz-8 ghz can be more than 10dB.
In this embodiment, as shown in fig. 4, the radio frequency is 5.25 GHz-5.75 GHz, the local oscillation frequency is 6.8GHz, the intermediate frequency is 1.3GHz, and the in-band amplitude fluctuation is 0.45dB.
In this embodiment, as shown in fig. 5, the in-band signal generates two paths of signals with equal amplitude and 90 ° phase difference through the action of the 90 ° bridge, the phase is kept unchanged after passing through two identical reflective filters, and then the two paths of signals with equal amplitude and same phase are synthesized (phase difference 0 ° signal) through the action of the 90 ° bridge.
In this embodiment, as shown in fig. 6, the signals outside the passband generate two paths of signals with equal amplitude and 90 ° phase difference through the action of a 90 ° bridge, after being reflected by two identical reflective filters, the phases remain unchanged, and then the signals with equal amplitude and opposite phases (signals with 180 ° phase difference) are synthesized through the action of the 90 ° bridge, and the cancellation signals are absorbed through the absorption load.
Although specific embodiments of the invention have been described in detail with reference to the accompanying drawings, it should not be construed as limiting the scope of protection of the present patent. Various modifications and variations which may be made by those skilled in the art without the creative effort are within the scope of the patent described in the claims.
Claims (2)
1. An implementation method of up-down conversion based on an absorption filter is characterized by comprising the following steps:
when the receiving and transmitting switch receives a control signal, the control circuit controls the state of the switch chip according to the content of the signal, a plurality of input ports and one output port of the switch chip are connected through a microwave wire, when the switch chip is in a certain state, the signal of the input port is transmitted to the output port, and when the starting signal is changed, the state of the switch chip is correspondingly changed;
step two, the in-band signals generate two paths of signals with equal amplitude and 90 DEG phase difference through the action of a 90 DEG bridge in the absorption filter, the signals are kept unchanged after passing through two identical reflection filters, the signals with equal amplitude and the same phase are synthesized through the action of the 90 DEG bridge, the signals outside the passband are generated by the action of the 90 DEG bridge in the absorption filter, the signals with equal amplitude and the 90 DEG phase difference are transmitted through the two identical reflection filters, the signals with equal amplitude and the opposite phase are synthesized through the action of the 90 DEG bridge, and the cancellation signals are absorbed through absorption loads;
and thirdly, performing balanced modulation on the input signal and the local oscillation signal through a mixer to complete frequency conversion, performing up-conversion to complete frequency conversion from an intermediate frequency to a radio frequency, and performing down-conversion to complete frequency conversion from the radio frequency to the intermediate frequency.
2. A filter applied in the second step of claim 1, characterized in that: the filter is an absorption filter, the absorption filter comprises two 90-degree electric bridges, two reflection filters and two absorption loads, the two 90-degree electric bridges are connected with the two reflection filters in series, the two absorption loads are connected with the two 90-degree electric bridges in series, the reflection filters are connected with the resonance capacitor and the resonance inductor in parallel to form a resonant cavity, and then the resonant cavity is connected with the coupling capacitor in series.
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| CN202311848338.8A CN117498806A (en) | 2023-12-29 | 2023-12-29 | Up-down conversion implementation method based on absorption filter and filter |
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| CN202311848338.8A CN117498806A (en) | 2023-12-29 | 2023-12-29 | Up-down conversion implementation method based on absorption filter and filter |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105814737A (en) * | 2013-12-10 | 2016-07-27 | 南加利福尼亚大学 | Enhancing isolation and impedance matching in hybrid-based cancellation networks and duplexers |
| CN105978522A (en) * | 2016-05-04 | 2016-09-28 | 电子科技大学 | Absorption-type band pass filter assembly |
| CN110931924A (en) * | 2019-12-27 | 2020-03-27 | 深圳波而特电子科技有限公司 | Novel absorption type functional band-pass filter based on phase difference principle |
| CN215897683U (en) * | 2021-09-15 | 2022-02-22 | 成都益为创科技有限公司 | Bidirectional frequency mixing assembly |
| CN116458008A (en) * | 2020-11-17 | 2023-07-18 | 高通股份有限公司 | Absorptive filter |
| CN117254228A (en) * | 2023-10-11 | 2023-12-19 | 南通大学 | Reflection-free waveguide band-pass filter based on 3dB orthogonal coupler |
-
2023
- 2023-12-29 CN CN202311848338.8A patent/CN117498806A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105814737A (en) * | 2013-12-10 | 2016-07-27 | 南加利福尼亚大学 | Enhancing isolation and impedance matching in hybrid-based cancellation networks and duplexers |
| CN105978522A (en) * | 2016-05-04 | 2016-09-28 | 电子科技大学 | Absorption-type band pass filter assembly |
| CN110931924A (en) * | 2019-12-27 | 2020-03-27 | 深圳波而特电子科技有限公司 | Novel absorption type functional band-pass filter based on phase difference principle |
| CN116458008A (en) * | 2020-11-17 | 2023-07-18 | 高通股份有限公司 | Absorptive filter |
| CN215897683U (en) * | 2021-09-15 | 2022-02-22 | 成都益为创科技有限公司 | Bidirectional frequency mixing assembly |
| CN117254228A (en) * | 2023-10-11 | 2023-12-19 | 南通大学 | Reflection-free waveguide band-pass filter based on 3dB orthogonal coupler |
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