CN215813054U - Millimeter wave active probe device suitable for OTA test - Google Patents
Millimeter wave active probe device suitable for OTA test Download PDFInfo
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- CN215813054U CN215813054U CN202122117131.6U CN202122117131U CN215813054U CN 215813054 U CN215813054 U CN 215813054U CN 202122117131 U CN202122117131 U CN 202122117131U CN 215813054 U CN215813054 U CN 215813054U
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Abstract
The utility model discloses a millimeter wave active probe device suitable for OTA test, which adopts 4 independent antenna layouts to form a transmitting and receiving dual-polarized antenna group, wherein the inside of the antenna comprises 2 independent transmitting channels and 2 independent receiving channels respectively, and simultaneously, the transmitting channels and the receiving channels adopt different intermediate frequency points in a frequency conversion mode, and the suppression among the channels is carried out through a post-stage filter; the connection between the antenna and the microstrip line is solved by adopting the SIW transmission line, so that the antenna is connected with the rear-stage active circuit through a PCB; the utility model comprehensively considers the requirements of probe of 5G OTA test, system integration of test and the like, increases the isolation between channels from the physical structure, and further improves the isolation by a frequency conversion mode; the loss of the millimeter wave front end circuit in the test is optimized, and the problem that the complicated test steps and the sporadic inaccuracy of the test result caused by the requirement of Trigger signals in the 5G TDD test in the OTA test are solved.
Description
Technical Field
The utility model relates to the technical field of microwaves, in particular to the technical field of OTA (over the air) test.
Background
With the rapid development of communication technology, the microwave technology field, especially the OTA test, is more and more widely applied. Meanwhile, under the large environment that the country insists on supporting and investing in 5G communication, the development of OTA test is further researched and advanced.
In the OTA test system, instruments such as a network analyzer, a vector signal source and the like are generally used as test system instruments. Therefore, in terms of testing system instruments, the test instruments are connected to the antennas through the feed lines, and line loss is introduced.
In the OTA test environment built by adopting the instrument, the cost of the instrument is high, and the building cost of the system is increased. Later, according to the OTA test requirement, it is a development trend to adopt a special test module.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems mentioned in the background art, the utility model provides a millimeter wave active probe device suitable for OTA testing. The path loss of the front end in the millimeter wave frequency band OTA test is reduced, the channel isolation is increased, and the test capability is improved.
In order to achieve the technical purpose, the technical scheme of the utility model is as follows:
a millimeter wave active probe device suitable for OTA test comprises two independent transmitting paths and two independent receiving paths, wherein the transmitting paths comprise a transmitting antenna, a first SIW transmission line, a first amplifier, a first digital program-controlled attenuator, a second amplifier, a second digital program-controlled attenuator, a first filter, an up-conversion multifunctional chip, a second filter, a third digital program-controlled attenuator, a third filter, a first frequency multiplier, a third amplifier, a fourth filter and a first power divider; the receiving path comprises a receiving antenna, a second SIW transmission line, a fourth digital program-controlled attenuator, a low-noise amplifier, a mixer, a fifth filter, a fourth amplifier, a first switch, a fifth amplifier, a second switch, a sixth filter, a second frequency multiplier, a sixth amplifier, a seventh filter and a second power divider, wherein the transmitting end of an intermediate-frequency signal in the transmitting path is connected with the input end of the third digital program-controlled attenuator, the output end of the third digital program-controlled attenuator is connected with the input end of the second filter, and the output end of the second filter is connected with the first input end of the variable-frequency multifunctional chip; the first local oscillator output end is connected with the input end of the first power divider, the first output end of the first power divider is connected with the local oscillator signal input end of the other transmission path, and the first output end of the power divider in the other transmission path is suspended; the second output end of the first power divider is connected with the input end of a fourth filter, the output end of the fourth filter is connected with the input end of a third amplifier, the output end of the third amplifier is connected with the input end of a first frequency multiplier, the output end of the first frequency multiplier is connected with the input end of a third filter, and the output end of the third filter is connected with the second input end of the upper variable-frequency multifunctional chip; the output end of the up-conversion multifunctional chip is connected with the input end of a first filter, the output end of the first filter is connected with the input end of a second digital program-controlled attenuator, the output end of the second digital program-controlled attenuator is connected with the input end of a second amplifier, the output end of the second amplifier is connected with the input end of a first digital program-controlled attenuator, the output end of the first digital program-controlled attenuator is connected with the input end of a first amplifier, the output end of the first amplifier is connected with the input end of a first SIW transmission line, and the output end of the first SIW transmission line is connected with a transmitting antenna; a receiving antenna in the receiving path is connected with the input end of a second SIW antenna, the output end of a second SIW transmission line is connected with the input end of a fourth digital program-controlled attenuator, the output end of the fourth digital program-controlled attenuator is connected with the input end of a low-noise amplifier, and the output end of the low-noise amplifier is connected with the first input end of a mixer; the second local oscillator output end is connected with the input end of the second power divider, the first output end of the second power divider is connected with the local oscillator signal input end of the other receiving channel, and the first output end of the power divider in the other receiving channel is suspended; the second output end of the second power divider is connected with the input end of a seventh filter, the output end of the seventh filter is connected with the input end of a sixth amplifier, the output end of the sixth amplifier is connected with the input end of a second frequency multiplier, the output end of the second frequency multiplier is connected with the input end of the sixth filter, and the output end of the sixth filter is connected with the second input end of the frequency mixer; the output end of the frequency mixer is connected with the input end of a fifth filter, the output end of the fifth filter is connected with the input end of a fourth amplifier, the output end of the fourth amplifier is connected with the input end of a first switch, the first output end of the first switch is connected with the input end of a fifth amplifier, and the output end of the fifth amplifier is connected with the first input end of a second switch; the second output end of the first switch is connected with the second input end of the second switch; the output end of the second switch is connected with the receiving end of the intermediate frequency signal.
Optionally, the device uses 4 independent antennas to form a receiving and transmitting dual-polarized antenna group, and antennas with the same polarization mode are arranged diagonally.
Optionally, the electronic components in the channels are integrated in a PCB board.
Optionally, each antenna back end of the device contains a separate active circuit.
Adopt the beneficial effect that above-mentioned technical scheme brought:
1. the 5G TDD test in the OTA test does not need Trigger signals through four independent channels, the test process is simpler, and the possibility of errors is reduced.
2. The isolation between the transmitting access and the receiving access in the OTA test is physically optimized through the dual-polarized diagonally distributed independent channels, different intermediate frequency points are introduced into the receiving access and the transmitting access to carry out inter-channel inhibition, and the isolation between the channels is further improved.
3. And the SIW transmission line is adopted to enable the antenna to be connected with the rear-stage active circuit to realize PCB board connection, so that the line loss of the millimeter wave front end in the OTA test is reduced.
Drawings
FIG. 1 is a block diagram of the internal circuitry of the apparatus of the present invention;
FIG. 2 is a switching section of the antenna and active circuit of the present invention;
fig. 3 is a layout of the front-end antenna of the device of the present invention.
Detailed Description
The technical scheme of the utility model is explained in detail in the following with the accompanying drawings.
The utility model adopts 4 independent channels, the interior of the probe respectively comprises 2 receiving channels and 2 transmitting channels, and a specific circuit composition block diagram is shown in figure 1 (only circuit composition block diagrams of 1 transmitting channel and 1 receiving channel are listed in the figure). The device specifically comprises the following parts: 1 transmitting antenna, 2 first SIW transmission line, 3 first amplifier, 4 first digital programmable attenuator, 5 second amplifier, 6 second digital programmable attenuator, 7 first filter, 8 up-conversion multifunctional chip, 9 second filter, 10 third digital programmable attenuator, 11 third filter, 12 first frequency multiplier, 13 third amplifier, 14 fourth filter, 15 first power divider, 16 receiving antenna, 17 second SIW transmission line, 18 fourth digital programmable attenuator, 19 low noise amplifier, 20 mixer, 21 fifth filter, 22 fourth amplifier, 23 first switch, 24 fifth amplifier, 25 second switch, 26 sixth filter, 27 second frequency multiplier, 28 sixth amplifier, 29 seventh filter, 30 second power divider.
The device of the utility model is provided with independent transmitting and receiving channels, thereby increasing the isolation between the channels in terms of physical structure.
The device has a frequency conversion function, adopts a frequency conversion mode for transmission and reception, corresponds to different Intermediate Frequency (IF) frequency points by providing local oscillation signals LO1 and LO2 of different frequency points under the condition that the RF end frequencies are the same, and can achieve high isolation by inhibiting channels through a filter.
The device adopts the SIW transmission line, solves the connection between the antenna and the microstrip line, and leads the antenna to be connected with the rear-stage active circuit to realize the PCB, and the specific circuit is shown in figure 2. The integration level of the active antenna is improved, the feeder loss of a millimeter wave part is solved, and the receiving capacity of the probe to small signals is improved.
The device adopts 4 independent antennas to form a transmitting and receiving dual-polarized antenna group, the rear end of each antenna comprises an independent active circuit, the antenna is in a real-time working state, and a Trigger signal is not needed to perform a switching function of transmitting and receiving in the 5G TDD test.
The antenna layout of the device of the present invention further increases the isolation of the channels, and as shown in fig. 3, the distance between the transmitting and receiving antennas is d1 in the horizontal direction, and the isolation between the transmitting/receiving antennas is increased by physical isolation of the space and the vertical (V) polarization and horizontal (H) polarization of the antennas. The distance between the antennas is increased to d2 by diagonal layout between the channels of the same polarization mode, and the transmitting/receiving isolation between the antennas of the same polarization is further increased by increasing the distance of the space.
By means of antenna layout and a mode that a rear-stage active circuit converts frequency to different intermediate frequency points, high isolation is achieved, and a high-performance millimeter wave active probe device is achieved.
The embodiments are only for illustrating the technical idea of the present invention, and the technical idea of the present invention is not limited thereto, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the scope of the present invention.
Claims (4)
1. A millimeter wave active probe device suitable for OTA test is characterized by comprising two independent transmitting paths and two independent receiving paths, wherein the transmitting paths comprise a transmitting antenna, a first SIW transmission line, a first amplifier, a first digital program-controlled attenuator, a second amplifier, a second digital program-controlled attenuator, a first filter, an up-conversion multifunctional chip, a second filter, a third digital program-controlled attenuator, a third filter, a first frequency multiplier, a third amplifier, a fourth filter and a first power divider; the receiving path comprises a receiving antenna, a second SIW transmission line, a fourth digital program-controlled attenuator, a low-noise amplifier, a mixer, a fifth filter, a fourth amplifier, a first switch, a fifth amplifier, a second switch, a sixth filter, a second frequency multiplier, a sixth amplifier, a seventh filter and a second power divider; the transmitting end of the intermediate frequency signal in the transmitting path is connected with the input end of a third digital program-controlled attenuator, the output end of the third digital program-controlled attenuator is connected with the input end of a second filter, and the output end of the second filter is connected with the first input end of the upper variable-frequency multifunctional chip; the first local oscillator signal output end is connected with the input end of the first power divider, the first output end of the first power divider is connected with the local oscillator signal input end of the other transmission path, and the first output end of the power divider in the other transmission path is suspended; the second output end of the first power divider is connected with the input end of a fourth filter, the output end of the fourth filter is connected with the input end of a third amplifier, the output end of the third amplifier is connected with the input end of a first frequency multiplier, the output end of the first frequency multiplier is connected with the input end of a third filter, and the output end of the third filter is connected with the second input end of the upper variable-frequency multifunctional chip; the output end of the up-conversion multifunctional chip is connected with the input end of a first filter, the output end of the first filter is connected with the input end of a second digital program-controlled attenuator, the output end of the second digital program-controlled attenuator is connected with the input end of a second amplifier, the output end of the second amplifier is connected with the input end of a first digital program-controlled attenuator, the output end of the first digital program-controlled attenuator is connected with the input end of a first amplifier, the output end of the first amplifier is connected with the input end of a first SIW transmission line, and the output end of the first SIW transmission line is connected with a transmitting antenna; a receiving antenna in the receiving path is connected with the input end of a second SIW antenna, the output end of a second SIW transmission line is connected with the input end of a fourth digital program-controlled attenuator, the output end of the fourth digital program-controlled attenuator is connected with the input end of a low-noise amplifier, and the output end of the low-noise amplifier is connected with the first input end of a mixer; the second local oscillator signal output end is connected with the input end of the second power divider, the first output end of the second power divider is connected with the local oscillator signal input end of the other receiving channel, and the first output end of the power divider of the other receiving channel is suspended; the second output end of the second power divider is connected with the input end of a seventh filter, the output end of the seventh filter is connected with the input end of a sixth amplifier, the output end of the sixth amplifier is connected with the input end of a second frequency multiplier, the output end of the second frequency multiplier is connected with the input end of the sixth filter, and the output end of the sixth filter is connected with the second input end of the frequency mixer; the output end of the frequency mixer is connected with the input end of a fifth filter, the output end of the fifth filter is connected with the input end of a fourth amplifier, the output end of the fourth amplifier is connected with the input end of a first switch, the first output end of the first switch is connected with the input end of a fifth amplifier, and the output end of the fifth amplifier is connected with the first input end of a second switch; the second output end of the first switch is connected with the second input end of the second switch; the output end of the second switch is connected with the receiving end of the intermediate frequency signal.
2. The millimeter wave active probe device suitable for OTA test according to claim 1, wherein the device adopts 4 independent antennas to form a receiving and transmitting dual-polarized antenna group, and the antennas with the same polarization mode are arranged diagonally.
3. The millimeter wave active probe device suitable for OTA testing according to claim 1, wherein the electronic components in the receive path or the transmit path are integrated in a PCB.
4. The millimeter wave active probe device suitable for OTA testing according to claim 1, wherein each antenna back end contains a separate active circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122117131.6U CN215813054U (en) | 2021-09-02 | 2021-09-02 | Millimeter wave active probe device suitable for OTA test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122117131.6U CN215813054U (en) | 2021-09-02 | 2021-09-02 | Millimeter wave active probe device suitable for OTA test |
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| Publication Number | Publication Date |
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| CN215813054U true CN215813054U (en) | 2022-02-11 |
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| CN202122117131.6U Active CN215813054U (en) | 2021-09-02 | 2021-09-02 | Millimeter wave active probe device suitable for OTA test |
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| CN (1) | CN215813054U (en) |
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2021
- 2021-09-02 CN CN202122117131.6U patent/CN215813054U/en active Active
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