CN213484889U - Signal transmission circuit for double antennas and radio frequency box comprising same - Google Patents
Signal transmission circuit for double antennas and radio frequency box comprising same Download PDFInfo
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- CN213484889U CN213484889U CN202022898901.0U CN202022898901U CN213484889U CN 213484889 U CN213484889 U CN 213484889U CN 202022898901 U CN202022898901 U CN 202022898901U CN 213484889 U CN213484889 U CN 213484889U
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Abstract
The application relates to the field of WIFI throughput testing, in particular to a signal transmission circuit for double antennas. The signal transmission circuit for the double antennas comprises a circulator, a signal transmitting unit and a signal receiving unit, wherein the circulator is provided with a first end, a second end and a third end, the first end and the second end of the circulator are in one-way conduction, and the third end and the first end of the circulator are in one-way conduction; the first end of the circulator is used for being electrically connected with the signal transmission port; the second end of the circulator is electrically connected with the test signal sending antenna through the signal transmitting unit; and the third end of the circulator is used for being electrically connected with the feedback signal receiving antenna through the signal receiving unit. The test device with only two signal transmission ports can meet the test requirement of a dual-antenna tested object and can measure the throughput of the tested object under the dynamic condition, and the test result is accurate.
Description
Technical Field
The application relates to the field of WIFI throughput testing, in particular to a signal transmission circuit for double antennas and a radio frequency box comprising the same.
Background
At present, when a WIFI throughput test is performed, a testing device usually has only two signal transmission ports, one signal transmission port is usually electrically connected with a test signal sending antenna, and the other signal transmission port is usually electrically connected with a feedback signal receiving antenna. For a single-antenna object under test, the object under test is usually provided with or connected to a test signal receiving antenna and a feedback signal transmitting antenna. During testing, a test signal is wirelessly transmitted to a tested object through the test signal transmitting antenna and the test signal receiving antenna, then the tested object wirelessly transmits a feedback signal to the testing device through the feedback signal transmitting antenna and the feedback signal receiving antenna, and the testing device can obtain the WIFI throughput of the tested object by analyzing and comparing the transmitted test signal and the received feedback signal.
However, with the development of science and technology, the number of the tested objects with dual antennas is more and more, and the tested objects with dual antennas are provided with their own test signal receiving antennas or connected with the test signal receiving antennas and the feedback signal transmitting antennas, so that the test requirements for the tested objects with dual antennas cannot be met for the test device with only two signal transmission ports.
In view of the above-mentioned related art, the inventor believes that there is a drawback that the test device having only two signal transmission ports cannot meet the test requirement for the dual-antenna object under test.
Disclosure of Invention
In order to enable the testing device with only two signal transmission ports to meet the testing requirement of a dual-antenna tested object, the application provides a signal transmission circuit for a dual antenna and a radio frequency box comprising the same.
In a first aspect, the present application provides a signal transmission circuit for dual antennas, which adopts the following technical solutions:
a signal transmission circuit for a double antenna comprises a circulator, a signal transmitting unit and a signal receiving unit, wherein the circulator is provided with a first end, a second end and a third end, the first end and the second end of the circulator are in one-way conduction, and the third end and the first end are in one-way conduction; the first end of the circulator is used for being electrically connected with the signal transmission port; the second end of the circulator is electrically connected with the test signal sending antenna through the signal transmitting unit; and the third end of the circulator is used for being electrically connected with the feedback signal receiving antenna through the signal receiving unit.
Through adopting above-mentioned technical scheme, when carrying out WIFI throughput test, the first end transmission to the signal transmitting unit of test signal accessible circulator, send test signal to the measured object through test signal transmitting antenna at last, the feedback signal that the measured object fed back can transmit to signal receiving unit through feedback signal receiving antenna, the third end transmission to testing arrangement's signal transmission port through the circulator at last, thereby to a signal transmission port of testing arrangement, also can realize the signal transmission and the receipt to a set of antenna of measured object. In practical use, the two data transmission circuits are respectively electrically connected with the two signal transmission ports, so that the test device can meet the test requirement of a double-antenna tested object.
Optionally, the signal transmitting unit includes a first isolator, the second end of the circulator is electrically connected to the input end of the first isolator, and the output end of the first isolator is used to be electrically connected to the test signal transmitting antenna.
By adopting the technical scheme, the first isolator can prevent the feedback signal from returning to the circulator through the test signal transmitting antenna, the effect of isolating the reverse signal can be achieved, and the precision of the test result is improved.
Optionally, the signal transmitting unit further includes a first amplifier, and the first amplifier is connected in series between the circulator and the first isolator; the second end of the circulator is electrically connected with the input end of the first amplifier, and the output end of the first amplifier is electrically connected with the input end of the first isolator.
By adopting the technical scheme, the first amplifier can amplify signals, so that the change of the throughput of the tested object when different signal sizes are tested in an auxiliary mode. Meanwhile, the power output by part of the testing device is limited, and the signal output by the testing device is amplified by the first amplifier, so that the testing device can meet the testing requirement and has strong universality.
Optionally, the signal transmitting unit further includes a first attenuator, and the first attenuator is connected in series between the circulator and the first amplifier; the input end of the first attenuator is electrically connected with the second end of the circulator, and the output end of the first attenuator is electrically connected with the input end of the first amplifier.
By adopting the technical scheme, if the standing-wave ratio of the first amplifier is too large, the first amplifier is burnt by signal reflection, the standing-wave ratio of the first amplifier can be reduced through the first attenuator, the first amplifier is effectively prevented from being damaged, and the service life of the first amplifier is prolonged.
Optionally, the signal transmitting unit further includes a second attenuator, and the second attenuator is connected in series between the first amplifier and the first isolator; the input end of the second attenuator is electrically connected with the output end of the first amplifier, and the output end of the second attenuator is electrically connected with the input end of the first isolator.
By adopting the technical scheme, if the standing-wave ratio of the first amplifier is too large, the first amplifier is burnt by signal reflection, the standing-wave ratio of the first amplifier can be reduced by the second attenuator, the first amplifier is effectively prevented from being damaged, and the service life of the first amplifier is prolonged.
Optionally, the signal receiving unit includes a second isolator, a third end of the circulator is electrically connected to an output end of the second isolator, and an input end of the second isolator is used for being electrically connected to the feedback signal receiving antenna.
Through adopting above-mentioned technical scheme, the second isolator can keep apart the test signal that part was transmitted to the third end of circulator by the first end of circulator to effectively prevent test signal transmission to the test result that feedback signal receiving antenna influences last throughput, thereby effectively guaranteed the precision of test result.
Optionally, the signal receiving unit further includes a second amplifier, and the second amplifier is connected in series between the input end of the second isolator and the feedback signal receiving antenna; the input end of the second amplifier is used for being electrically connected with a feedback signal receiving antenna, and the output end of the second amplifier is electrically connected with the input end of the second isolator.
By adopting the technical scheme, the second amplifier can amplify the feedback signal received by the feedback signal receiving antenna, so that the change of the throughput of the tested object when different signal sizes are tested can be assisted.
Optionally, the signal receiving unit further includes a third attenuator and a fourth attenuator, the third attenuator is connected in series between the feedback signal receiving antenna and the second amplifier, and the fourth attenuator is connected in series between the second amplifier and the second isolator; the input end of the third attenuator is electrically connected with a feedback signal receiving antenna, and the output end of the third attenuator is electrically connected with the input end of the second amplifier; the input end of the fourth attenuator is electrically connected with the output end of the second amplifier, and the output end of the fourth attenuator is electrically connected with the input end of the second isolator.
By adopting the technical scheme, if the standing-wave ratio of the second amplifier is too large, the second amplifier is burnt by signal reflection, the third attenuator and the fourth attenuator can respectively attenuate signals at the front end and the rear end of the second amplifier, the standing-wave ratio of the second amplifier is reduced, the second amplifier is effectively prevented from being damaged, and the service life of the second amplifier is prolonged.
Optionally, the fourth attenuator is an adjustable attenuator.
By adopting the technical scheme, the size of the signal returned by the tested object can be adjusted, so that the throughput of the tested object under the dynamic condition can be measured, and the test result is more accurate.
In a second aspect, the present application provides a radio frequency box, which adopts the following technical scheme:
a radio frequency box comprises any one of the signal transmission circuits for the double antennas.
In summary, the present application includes at least one of the following beneficial technical effects:
the testing device with only two signal transmission ports can also meet the testing requirement of the tested object with double antennas;
the accuracy of the test result is improved;
the testing device can meet the testing requirements and has strong universality;
the throughput of the tested object under the dynamic condition can be measured, and the test result is accurate.
Drawings
Fig. 1 is a schematic circuit diagram of a signal transmission circuit and a testing apparatus for dual antennas according to an embodiment of the present application.
Description of reference numerals: 1. a testing device; 11. a signal transmission port; 2. a test signal transmitting antenna; 3. a feedback signal receiving antenna; 4. a signal transmitting unit; 41. a first isolator; 42. a first amplifier; 43. a first attenuator; 44. a second attenuator; 5. a signal receiving unit; 51. a second isolator; 52. a second amplifier; 53. a third attenuator; 54. a fourth attenuator; 6. a circulator; 61. a first end; 62. a second end; 63. and a third end.
Detailed Description
The present application is described in further detail below with reference to fig. 1.
When carrying out WIFI throughput test, in order to make testing arrangement 1 that only two signal transmission ports 11 can satisfy the test demand of two antenna testees, this application provides a radio frequency box, and it includes two at least signal transmission circuit, and signal transmission circuit is used for making a signal transmission port 11 realize can sending the signal to the testee, can receive the signal that comes from the testee again. The specific arrangement of the signal transmission circuit is set forth below.
The embodiment of the application discloses a signal transmission circuit for double antennas. Referring to fig. 1, the signal transmission circuit for a dual antenna includes a circulator 6, a signal transmitting unit 4, and a signal receiving unit 5, and the circulator is a multi-port device that sequentially transmits an incident wave entering any one port thereof to a next port in a direction determined by a static bias magnetic field. The circulator 6 is provided with a first end 61, a second end 62 and a third end 63, the first end 61 to the second end 62 of the circulator 6 are in one-way conduction, and the third end 63 to the first end 61 are in one-way conduction. The first end 61 of the circulator 6 is used for electrically connecting with the signal transmission port 11, where the signal transmission port 11 refers to the signal transmission port 11 of the testing device 1, and the testing device 1 may be a WIFI comprehensive tester. The second end 62 of the circulator 6 is used for being electrically connected with the test signal sending antenna 2 through the signal transmitting unit 4; the third terminal 63 of the circulator 6 is used for electrically connecting with the feedback signal receiving antenna 3 through the signal receiving unit 5. Therefore, the test signal transmitted from the signal transmission port 11 of the test device 1 is transmitted to only the branch where the signal transmitting unit 4 is located under the action of the circulator 6, and is finally transmitted to the object to be tested through the test signal transmitting antenna 2. The feedback signal fed back from the object to be tested is transmitted to the testing device 1 only through the branch of the signal receiving unit 5 under the action of the circulator 6. Thus, for one signal transmission port 11 of the test apparatus 1, it is also possible to transmit and receive signals to and from a group of antennas of the object to be tested, where a group refers to two antennas for transmission and reception. In actual use, the two data transmission circuits are respectively electrically connected with the two signal transmission ports 11, the two signal transmission ports 11 can simultaneously send test signals to a tested object during testing, and when the tested object with the double antennas feeds back feedback signals, the two signal transmission ports 11 can simultaneously receive the feedback signals fed back by the tested object based on the received test signals. Therefore, for the testing device 1 with only two signal transmission ports 11, the testing requirement of the dual-antenna tested object can be still met through the data transmission circuit.
The specific arrangement of the signal transmitting unit 4 and the signal receiving unit 5 is specifically set forth below.
With regard to the specific arrangement of the signal transmitting unit 4, referring to fig. 1, the signal transmitting unit 4 includes a first isolator 41, an input end to an output end of the first isolator 41 are unidirectionally conducted, and an output end to an input end of the first isolator 41 are not conducted. The second end 62 of the circulator 6 is electrically connected to the input end of the first isolator 41, and the output end of the first isolator 41 is used for electrically connecting to the test signal transmitting antenna 2. The isolator adopts a linear optical coupling isolation principle to convert and output an input signal. The input, the output and the working power supply are mutually isolated, and the power supply is particularly suitable for being matched with an equipment instrument needing electric isolation. Isolators, also known as signal isolators, are important components of industrial control systems. The first isolator 41 is matched with the circulator 6 to prevent the feedback signal from being reversely transmitted to the testing device 1 through the testing signal transmitting antenna 2 and the circulator 6, so that the effect of isolating the reverse signal can be achieved, and the precision of the testing result is improved.
Further, referring to fig. 1, the signal transmitting unit 4 further includes a first amplifier 42, a first attenuator 43, and a second attenuator 44, and the first attenuator 43 and the second attenuator 44 may each be a fixed attenuator, the first amplifier 42 being connected in series between the circulator 6 and the first isolator 41, and the second attenuator 44 being connected in series between the first amplifier 42 and the first isolator 41. Specifically, the input terminal of the first attenuator 43 is electrically connected to the second terminal 62 of the circulator 6, and the output terminal of the first attenuator 43 is electrically connected to the input terminal of the first amplifier 42. An input terminal of the second attenuator 44 is electrically connected to an output terminal of the first amplifier 42, and an output terminal of the second attenuator 44 is electrically connected to an input terminal of the first isolator 41. Therefore, the first attenuator 43 and the second attenuator 44 can respectively attenuate signals at the front end and the rear end of the first amplifier 42, thereby reducing the standing wave ratio of the first amplifier 42, effectively preventing the first amplifier 42 from being damaged, and prolonging the service life of the first amplifier 42.
With regard to the specific arrangement of the signal receiving unit 5, referring to fig. 1, the signal receiving unit 5 includes a second isolator 51, the third terminal 63 of the circulator 6 is electrically connected to the output terminal of the second isolator 51, and the input terminal of the second isolator 51 is used for being electrically connected to the feedback signal receiving antenna 3. Although the circulator 6 has a certain isolation function, in practical use, there is still a possibility that the test signal is transmitted from the first end 61 of the circulator 6 to the third end 63 of the circulator 6, and the second isolator 51 can isolate the part of the test signal transmitted from the first end 61 of the circulator 6 to the third end 63 of the circulator 6, so that the test signal is effectively prevented from being transmitted to the feedback signal receiving antenna 3 to affect the test result of the final throughput, and the accuracy of the test result is effectively ensured.
Further, referring to fig. 1, the signal receiving unit 5 further includes a second amplifier 52, a third attenuator 53, and a fourth attenuator 54, the second amplifier 52 being connected in series between the input terminal of the second isolator 51 and the feedback signal receiving antenna 3, the third attenuator 53 being connected in series between the feedback signal receiving antenna 3 and the second amplifier 52, and the fourth attenuator 54 being connected in series between the second amplifier 52 and the second isolator 51. Specifically, the input terminal of the third attenuator 53 is electrically connected to the feedback signal receiving antenna 3, and the output terminal of the third attenuator 53 is electrically connected to the input terminal of the second amplifier 52. An input terminal of the fourth attenuator 54 is electrically connected to an output terminal of the second amplifier 52, and an output terminal of the fourth attenuator 54 is electrically connected to an input terminal of the second isolator 51. Therefore, the third attenuator 53 and the fourth attenuator 54 can respectively attenuate signals at the front end and the rear end of the second amplifier 52, thereby reducing the standing-wave ratio of the second amplifier 52, effectively preventing the second amplifier 52 from being damaged, and prolonging the service life of the second amplifier 52.
Meanwhile, referring to fig. 1, the third attenuator 53 may be a fixed attenuator and the fourth attenuator 54 may be an adjustable attenuator. The fourth attenuator 54 is adjustable, so that the magnitude of a signal returned by the tested object can be adjusted, the throughput of the tested object under the dynamic condition can be measured, and the test result is accurate.
The implementation principle of the signal transmission circuit for the double antennas and the radio frequency box comprising the signal transmission circuit for the double antennas is as follows: in the case of WIFI throughput testing, a test signal may be transmitted through first end 61 of circulator 6 to second end 62 of circulator 6, then transmits the test signal to the object to be tested through the test signal transmitting antenna 2 via the first attenuator 43, the first amplifier 42, the second attenuator 44 and the isolator in sequence, the feedback signal fed back by the object to be tested can be received through the feedback signal receiving antenna 3, then the feedback signal is transmitted to the third terminal 63 of the circulator 6 through the third attenuator 53, the second amplifier 52 and the fourth attenuator 54 in sequence, finally the feedback signal is transmitted to the first terminal 61 of the circulator 6 from the third terminal 63 of the circulator 6, finally transmitted to the signal transmission port 11 of the testing device 1, thus, for one signal transmission port 11 of the test apparatus 1, signal transmission and reception for a set of antennas of the object to be tested can be realized. In practical use, the two data transmission circuits are respectively electrically connected with the two signal transmission ports 11, so that the test device 1 can meet the test requirement of a dual-antenna tested object.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A signal transmission circuit for a dual antenna, characterized by: the device comprises a circulator (6), a signal transmitting unit (4) and a signal receiving unit (5), wherein the circulator (6) is provided with a first end (61), a second end (62) and a third end (63), the first end (61) to the second end (62) of the circulator (6) are in one-way conduction, and the third end (63) to the first end (61) are in one-way conduction;
the first end (61) of the circulator (6) is used for being electrically connected with a signal transmission port (11);
the second end (62) of the circulator (6) is used for being electrically connected with the test signal sending antenna (2) through the signal transmitting unit (4);
and the third end (63) of the circulator (6) is used for being electrically connected with the feedback signal receiving antenna (3) through the signal receiving unit (5).
2. The signal transmission circuit for a dual antenna of claim 1, wherein: the signal transmitting unit (4) comprises a first isolator (41), the second end (62) of the circulator (6) is electrically connected with the input end of the first isolator (41), and the output end of the first isolator (41) is used for being electrically connected with the test signal transmitting antenna (2).
3. The signal transmission circuit for a dual antenna of claim 1, wherein: the signal transmitting unit (4) further comprises a first amplifier (42), the first amplifier (42) being connected in series between the circulator (6) and a first isolator (41); the second end (62) of the circulator (6) is electrically connected with the input end of the first amplifier (42), and the output end of the first amplifier (42) is electrically connected with the input end of the first isolator (41).
4. The signal transmission circuit for a dual antenna of claim 3, wherein: the signal transmitting unit (4) further comprises a first attenuator (43), the first attenuator (43) being connected in series between the circulator (6) and a first amplifier (42);
the input end of the first attenuator (43) is electrically connected with the second end (62) of the circulator (6), and the output end of the first attenuator (43) is electrically connected with the input end of the first amplifier (42).
5. The signal transmission circuit for a dual antenna of claim 4, wherein: the signal transmitting unit (4) further comprises a second attenuator (44), the second attenuator (44) being connected in series between the first amplifier (42) and the first isolator (41);
the input end of the second attenuator (44) is electrically connected with the output end of the first amplifier (42), and the output end of the second attenuator (44) is electrically connected with the input end of the first isolator (41).
6. The signal transmission circuit for a dual antenna according to any one of claims 1 to 5, characterized in that: the signal receiving unit (5) comprises a second isolator (51), the third end (63) of the circulator (6) is electrically connected with the output end of the second isolator (51), and the input end of the second isolator (51) is used for being electrically connected with the feedback signal receiving antenna (3).
7. The signal transmission circuit for a dual antenna as recited in claim 6, wherein: the signal receiving unit (5) further comprises a second amplifier (52), the second amplifier (52) being connected in series between the input of the second isolator (51) and the feedback signal receiving antenna (3);
the input end of the second amplifier (52) is used for being electrically connected with a feedback signal receiving antenna (3), and the output end of the second amplifier (52) is electrically connected with the input end of the second isolator (51).
8. The signal transmission circuit for a dual antenna as recited in claim 7, wherein: the signal receiving unit (5) further comprises a third attenuator (53) and a fourth attenuator (54), the third attenuator (53) being connected in series between the feedback signal receiving antenna (3) and the second amplifier (52), the fourth attenuator (54) being connected in series between the second amplifier (52) and the second isolator (51);
the input end of the third attenuator (53) is used for being electrically connected with a feedback signal receiving antenna (3), and the output end of the third attenuator (53) is electrically connected with the input end of the second amplifier (52);
the input end of the fourth attenuator (54) is electrically connected with the output end of the second amplifier (52), and the output end of the fourth attenuator (54) is electrically connected with the input end of the second isolator (51).
9. The signal transmission circuit for a dual antenna of claim 8, wherein: the fourth attenuator (54) is an adjustable attenuator.
10. A radio frequency cabinet characterized by: signal transmission circuitry for a dual antenna comprising a method as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022898901.0U CN213484889U (en) | 2020-12-04 | 2020-12-04 | Signal transmission circuit for double antennas and radio frequency box comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022898901.0U CN213484889U (en) | 2020-12-04 | 2020-12-04 | Signal transmission circuit for double antennas and radio frequency box comprising same |
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| Publication Number | Publication Date |
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| CN213484889U true CN213484889U (en) | 2021-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022898901.0U Active CN213484889U (en) | 2020-12-04 | 2020-12-04 | Signal transmission circuit for double antennas and radio frequency box comprising same |
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