CN217587420U - Whistles-free reverberation chamber - Google Patents
Whistles-free reverberation chamber Download PDFInfo
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- CN217587420U CN217587420U CN202220786790.0U CN202220786790U CN217587420U CN 217587420 U CN217587420 U CN 217587420U CN 202220786790 U CN202220786790 U CN 202220786790U CN 217587420 U CN217587420 U CN 217587420U
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Abstract
The stirrer-free reverberation chamber mainly comprises a shielding chamber (1), a first capacitor plate (2), a second capacitor plate (3) and an antenna (4); the shielding chamber (1) is internally cuboid and comprises six wall surfaces including a front wall (11), a rear wall (12), a first side wall (13), a second side wall (14), a bottom surface (15) and a top surface (16); the capacitance value of the equivalent capacitance on the first (2) and second (3) capacitive plates can be changed during operation of the reverberation chamber. The stirrer-free reverberation chamber can have the electric action of the stirrer in the reverberation chamber without using a mechanical stirrer, realizes the electromagnetic field averaging in the test region of the reverberation chamber, improves the averaging frequency, increases the averaging mode, saves the power loss, enlarges the equivalent length of the reverberation chamber, and reduces the lowest working frequency of the reverberation chamber.
Description
Technical Field
The invention relates to an electromagnetic compatibility test, in particular to a stirrer-free reverberation chamber.
Background
In the test of the electromagnetic compatibility test, it is necessary to subject a test object to a uniform electromagnetic field while shielding the test apparatus from interfering with the external environment. Therefore, the electromagnetic compatibility test is usually carried out in an anechoic chamber or a reverberation chamber, and the anechoic chamber has relatively low test efficiency and is mainly used for the measurement of large-scale devices. With the application of a large number of new technologies such as 5G communication, automatic driving automobiles, electronic tags, power line carriers and the like, a lot of products need to perform comprehensive electromagnetic compatibility tests, and a reverberation room is often the first-choice test environment.
As an electromagnetic compatibility measuring device, the existing reverberation chamber includes a shielding chamber, a chamber stirrer, and an exciting antenna. The shielding chamber can shield the test device from external interference. To achieve this shielding, the insulating material of the shielding chamber is metal. Therefore, the shielding chamber, namely the reverberation chamber, is equivalent to a metal resonant cavity, an electromagnetic field in the cavity is in standing wave distribution, the uniformity of the electromagnetic field is poor, and the test requirement of electromagnetic compatibility radio frequency radiation immunity cannot be met. The indoor stirrer is used for randomly changing the boundary position of the shielding chamber, namely randomly changing the position of the boundary short circuit electric wall, further randomly changing the resonance wavelength and the field distribution of the resonance mode, and realizing the homogenization of the electromagnetic field distribution in the mean time statistic in the tested area.
In principle, the action of the stirrer is equivalent to mechanically changing the position of a short circuit electric wall of the resonator, and the stroke of the stirrer determines the change range of the mode resonance wavelength, the change range of the voltage wave node and further the range of the test area. The larger the stirrer stroke, the better the averaging effect, but the stirrer stroke is limited by the structural dimensions. The power of the stirrer determines the stirring frequency of the stirrer, determines the stirring average frequency of the electromagnetic field amplitude distribution of the tested area, the larger the frequency is, the better the averaging effect is, but the larger the frequency is, the larger the requirement on the driving power of the stirrer is, and particularly, the larger the reverberation room is, the more the consumed power is.
Disclosure of Invention
The invention provides a stirrer-free reverberation chamber, which can realize the electric action of a stirrer in the reverberation chamber without using a mechanical stirrer, realize the electromagnetic field averaging of a test region of the reverberation chamber, improve the averaging frequency, increase the averaging mode and simultaneously save the power loss.
The technical scheme is as follows:
the invention discloses a stirrer-free reverberation chamber, which is characterized in that the adopted embodiment is as follows: the whistles less reverberation chamber comprises a shield chamber, a first capacitive plate, a second capacitive plate, and an antenna; the shielding chamber is internally shaped like a cuboid and is provided with six wall surfaces including a front wall, a rear wall, a first side wall, a second side wall, a bottom surface and a top surface; the first capacitor plate and the second capacitor plate are both positioned in the shielding chamber; a first capacitor network on the first capacitor plate forms two equivalent capacitors, one is a first horizontal equivalent capacitor terminated between the first sidewall and the second sidewall, and the other is a first vertical equivalent capacitor terminated between the bottom surface and the top surface; the capacitance values of the first horizontal equivalent capacitor and the first vertical equivalent capacitor can be changed during the operation of the reverberation chamber; a second capacitor network on the second capacitor plate forms two equivalent capacitors, one being a second horizontal equivalent capacitor terminated between the first sidewall and the second sidewall; the other is a second vertical equivalent capacitance terminated between the bottom surface and the top surface; the capacitance values of the second horizontal equivalent capacitor and the second vertical equivalent capacitor can be changed during the operation of the reverberation chamber; the antenna is located in the shielded room.
The first capacitor plate is parallel to the front wall and electrically connected with the first side wall and the second side wall; the second capacitor plate is parallel to the rear wall and electrically connected to the bottom and top surfaces.
The distance from the first capacitor plate to the front wall can be adjusted, and the distance from the first capacitor plate to the front wall is smaller than the distance from the first capacitor plate to the rear wall; the distance from the second capacitor plate to the rear wall can be adjusted, and the distance from the second capacitor plate to the rear wall is smaller than the distance from the second capacitor plate to the front wall.
The larger the capacitance values of the first horizontal equivalent capacitor, the first vertical equivalent capacitor, the second horizontal equivalent capacitor and the second vertical equivalent capacitor are, the lower the working frequency of the reverberation chamber is.
Different first capacitor plates can be used according to different working frequencies, the capacitance values of the first horizontal equivalent capacitors of the first capacitor plates have different variation ranges, and the capacitance values of the first vertical equivalent capacitors of the first capacitor plates have different variation ranges; different second capacitor plates can be used instead according to different working frequencies, the capacitance values of the second horizontal equivalent capacitors of the second capacitor plates have different variation ranges, and the capacitance values of the second vertical equivalent capacitors of the second capacitor plates have different variation ranges.
The capacitance values of the first horizontal equivalent capacitor, the first vertical equivalent capacitor, the second horizontal equivalent capacitor and the second vertical equivalent capacitor can be switched rapidly through the electric control switch.
The capacitance of the first capacitor plate may be provided by a varactor, and the capacitance values of the first horizontal equivalent capacitance and the first vertical equivalent capacitance are changed by changing a bias voltage of the varactor.
The capacitance of the second capacitor plate may be provided by a varactor, and the capacitance values of the second horizontal equivalent capacitance and the second vertical equivalent capacitance are changed by changing a bias voltage of the varactor.
The first capacitor plate and the second capacitor plate can be used in the shielding chamber at the same time, or only one of the first capacitor plate and the second capacitor plate can be used.
In the whistles-free reverberation chamber, the shielded chamber forms a rectangular parallelepiped metal resonator, the front and rear walls act as a short circuit, and the direction from the front wall to the rear wall is referred to as the longitudinal direction.
The effect of the first capacitive plate in the shielded room can be illustrated by a transmission line equivalent circuit. At the location of the first capacitor plate, the front wall acts as an inductorL. According to the transmission line theory, there are
In the above formula, ω is the operating frequency,Zis the characteristic impedance of the circuit board,Vis the phase velocity in the longitudinal direction of the motor,Ais the distance of the front wall from the first capacitor plate,Aless than one quarter of the longitudinal wavelength.AThe larger the size of the hole is,Lthe larger; otherwise, the reverse is carried outLThe larger the size, the equivalent toAThe larger. At the position of the first capacitor plate, the equivalent capacitance of the first capacitor plateCAndLare connected in parallel to form a total equivalent inductanceL d 。
Is provided with
. When in use
When the temperature of the water is higher than the set temperature,
。
can also be effected by a distance from the first capacitor plateA d Is equivalent to a short-circuit surface. Due to the fact that
Therefore, it is
. The first capacitive plate thus corresponds to an increase in the equivalent length of the longitudinal direction of the shielding chamber, so that the equivalent length of the longitudinal direction is greater than the actual length of the longitudinal direction of the shielding chamber, thus reducing the lowest operating frequency of the reverberation chamber.
When in use
When the temperature of the water is higher than the set temperature,
such that the equivalent capacitance of the first capacitor plateCAndLparallel connection, in fact, forms a total equivalent capacitance, which corresponds to the front wall being at a distance greater than a quarter of the longitudinal wavelength from the first capacitive plate, so that the equivalent length in the longitudinal direction of the shielding chamber is greater than
The situation is.
For a mode having a horizontal-direction electric field component along the first sidewall to the second sidewall, the equivalent capacitance C of equation (2) is the first horizontal equivalent capacitance of the first capacitive plate; for the mode with the electric field component in the vertical direction from the bottom surface to the top surface, the equivalent capacitance C of equation (2) is the first vertical equivalent capacitance of the first capacitor plate.
When the first horizontal equivalent capacitance or the second vertical equivalent capacitance of the first capacitor plate is changed, the effect of the first capacitor plate is equivalent to the change of the equivalent length in the longitudinal direction of the shielding chamber according to the formula (2), which is the same as the effect of the stirrer in the existing reverberation chamber, but the effect of the first capacitor plate is more diversified than the effect of the stirrer. The first horizontal equivalent capacitor and the second vertical equivalent capacitor act on the electric field components in the horizontal and vertical orthogonal directions respectively, and if two resonance modes have the horizontal and vertical electric field components respectively, the longitudinal equivalent lengths of the shielding chamber can be different for the two modes; further, if a resonant mode has both horizontal and vertical electric field components, for such a mode, the different field components correspond to different longitudinal equivalent lengths. These different longitudinal equivalent length effects may provide a more varied "stirring" averaging effect than existing stirrers do not.
The working principle of the second capacitor plate is the same as that of the first capacitor plate.
Because the first horizontal equivalent capacitor, the first vertical equivalent capacitor, the second horizontal equivalent capacitor and the second vertical equivalent capacitor can be electrically controlled to change, the change rate can be far greater than the stirring rate of the mechanical stirrer. When the first capacitor plate and the second capacitor plate work simultaneously, the two equivalent short-circuit surfaces of the shielding chamber can be moved in the same direction, and the two equivalent short-circuit surfaces of the shielding chamber can also be moved in opposite directions, so that the average working mode is increased. Therefore, the averaging effect of the first capacitor plate and the second capacitor plate on the field intensity of the test area is better.
The first capacitor plate and the second capacitor plate are detachable, and the first capacitor plate or the second capacitor plate can be taken out of the shielding chamber, so that the reverberation chamber can also work. Within the shielded room, at a longitudinal position, there may be a plurality of first electrodesThe capacitor plate or the second capacitor plate. Or a plurality of first capacitor plates or second capacitor plates can be arranged at different positions in the shielding chamber, which is equivalent to thatLThe effect of the first capacitor plate or the second capacitor plate of the multistage amplifier is more obvious.
The equivalent capacitance of the first capacitor plate or the second capacitor plate according to equation (2)CThe larger the capacitance, the greater the reinforcing effect of the first or second capacitive plate.
The first side face, the second side face, the top face and the bottom face of the shielding chamber are provided with connecting devices, on one hand, the first capacitor plate and the second capacitor plate can be installed in the shielding chamber, the first capacitor network of the first capacitor plate is ensured to be electrically connected with the first side face, the second side face, the top face and the bottom face, the second capacitor network of the second capacitor plate is ensured to be electrically connected with the first side face, the second side face, the top face and the bottom face, and on the other hand, the first capacitor plate and the second capacitor plate can be detached and replaced.
Has the advantages that: the invention has the beneficial effects that: the proposed mixer-free reverberation chamber can have the electric action of the mixer in the reverberation chamber without using a mechanical mixer, realizes the electromagnetic field averaging in the test region of the reverberation chamber, improves the averaging frequency, increases the averaging mode, saves the power loss, enlarges the equivalent length of the reverberation chamber, and reduces the lowest working frequency of the reverberation chamber.
Drawings
FIG. 1 is a schematic diagram of a whistlestless reverberation chamber of the present invention;
FIG. 2 is a top view of the whistles reverberation chamber of the present invention
FIG. 3 is a schematic diagram of a first capacitive plate of the whistlestless reverberation chamber of the present invention;
FIG. 4 is a schematic diagram of a second capacitive plate of the whistles less reverberation chamber of the invention;
there is a shielded room 1, a first capacitive plate 2, a second capacitive plate 3, a front wall 11, a rear wall 12, a first side wall 13, a second side wall 14, a bottom surface 15, a top surface 16, a first capacitive network 20, a second capacitive network 30 and an antenna 4.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The specific embodiments described herein are merely illustrative of the invention and do not limit the invention to the specific embodiments.
The embodiment adopted by the invention is as follows: the whistles less reverberation chamber comprises a shielding chamber 1, a first capacitive plate 2, a second capacitive plate 3 and an antenna 4; the shielding chamber 1 is internally shaped like a cuboid and comprises six wall surfaces including a front wall 11, a rear wall 12, a first side wall 13, a second side wall 14, a bottom surface 15 and a top surface 16; the first capacitor plate 2 and the second capacitor plate 3 are both positioned in the shielding chamber 1; the first capacitor network 20 on the first capacitor plate 2 forms two equivalent capacitances, one is a first horizontal equivalent capacitance terminating between the first sidewall 13 and the second sidewall 14, and the other is a first vertical equivalent capacitance terminating between the bottom surface 15 and the top surface 16; the capacitance values of the first horizontal equivalent capacitor and the first vertical equivalent capacitor can be changed during the operation of the reverberation chamber; the second capacitive network 30 on the second capacitive plate 3 forms two equivalent capacitances, one being the second horizontal equivalent capacitance terminating between the first sidewall 13 and the second sidewall 14; the other is a second vertical equivalent capacitance terminating between bottom surface 15 and top surface 16; the capacitance values of the second horizontal equivalent capacitor and the second vertical equivalent capacitor can be changed during the operation of the reverberation chamber; the antenna 4 is located inside the shielded room 1.
The first capacitive plate 2 is parallel to the front wall 11, electrically connected to the first 13 and second 14 side walls; second capacitor plate 3 is parallel to rear wall 12 and is electrically connected to bottom surface 15 and top surface 16.
The distance from the first capacitor plate 2 to the front wall 11 can be adjusted, and the distance from the first capacitor plate 2 to the front wall 11 is smaller than the distance from the first capacitor plate 2 to the rear wall 12; the distance of the second capacitor plate 3 from the rear wall 12 is adjustable, and the distance of the second capacitor plate 3 from the rear wall 12 is smaller than the distance of the second capacitor plate 3 from the front wall 11.
The larger the capacitance values of the first horizontal equivalent capacitor, the first vertical equivalent capacitor, the second horizontal equivalent capacitor and the second vertical equivalent capacitor are, the lower the working frequency of the reverberation chamber is.
Different first capacitor plates 2 can be used instead according to different working frequencies, the capacitance values of the first horizontal equivalent capacitors of the first capacitor plates 2 have different variation ranges, and the capacitance values of the first vertical equivalent capacitors of the first capacitor plates 2 have different variation ranges; different second capacitor plates 3 can be used instead according to different operating frequencies, the capacitance values of the second horizontal equivalent capacitors of the second capacitor plates 3 have different variation ranges, and the capacitance values of the second vertical equivalent capacitors of the second capacitor plates 3 have different variation ranges.
The capacitance values of the first horizontal equivalent capacitor, the first vertical equivalent capacitor, the second horizontal equivalent capacitor and the second vertical equivalent capacitor can be switched rapidly through the electric control switch.
The capacitance of the first capacitor plate 2 may be provided by a varactor, the capacitance values of the first horizontal and vertical equivalent capacitances being varied by varying the bias voltage of the varactor.
The capacitance of the second capacitor plate 3 may be provided by a varactor, and the capacitance values of the second horizontal equivalent capacitance and the second vertical equivalent capacitance are changed by changing the bias voltage of the varactor.
The first capacitor plate 2 and the second capacitor plate 3 may be used in the shielding chamber 1 at the same time, or only one of the first capacitor plate 2 and the second capacitor plate 3 may be used.
In the whistles-free reverberation chamber, the shielding chamber 1 constitutes a rectangular parallelepiped metal resonator, the front wall 11 and the rear wall 12 act as a short circuit, and the direction along the front wall 11 to the rear wall 11 is referred to as the longitudinal direction.
The function of the first capacitor plate 2 in the shielding cage 1 can be illustrated by a transmission line equivalent circuit. At the location of the first capacitor plate 2, the front wall 11 acts as an inductorL. According to the transmission line theory, there are
In the above formula, ω is the operating frequency,Zis the characteristic impedance of the circuit board,Vis the phase velocity in the longitudinal direction of the motor,Ais the distance of the front wall 11 from the first capacitor plate 2,Aless than one quarter of the longitudinal wavelength。AThe larger the size of the tube is,Lthe larger; otherwise, the reverse is carried outLThe larger the size, the equivalent toAThe larger. At the position of the first capacitor plate 2, the equivalent capacitance of the first capacitor plate 2CAndLare connected in parallel to form a total equivalent inductanceL d 。
Is provided with
. When in use
When the temperature of the water is higher than the set temperature,
。
can also be effected with a distance from the first capacitor plate 2A d Is equivalent to a short-circuit surface. Due to the fact that
Therefore, it is
. The first capacitor plate 2 is equivalent to increasing the equivalent length of the shielding chamber 1 in the longitudinal direction, so that the equivalent length in the longitudinal direction is greater than the actual length of the shielding chamber 1 in the longitudinal direction, thereby reducing the lowest operating frequency of the reverberation chamber.
When the temperature is higher than the set temperature
When the temperature of the water is higher than the set temperature,
thus the equivalent capacitance of the first capacitor plate 2CAndLparallel, substantially shapedAn overall equivalent capacitance is formed, which corresponds to the front wall 11 being at a distance greater than a quarter of the longitudinal wavelength from the first capacitor plate 2, so that the equivalent length in the longitudinal direction of the shielded room 1 is greater than
The situation is.
For a mode having a horizontal-direction electric field component along the first sidewall 13 to the second sidewall 14, the equivalent capacitance C of equation (2) is the first horizontal equivalent capacitance of the first capacitive plate 2; for a mode having a vertically oriented electric field component along the bottom surface 15 to the top surface 16, the equivalent capacitance C of equation (2) is the first vertical equivalent capacitance of the first capacitor plate 2.
When the first horizontal equivalent capacitance or the second vertical equivalent capacitance 22 of the first capacitive plate 2 is changed, the function corresponding to the change of the equivalent length in the longitudinal direction of the shielding room 1 according to the formula (2) is the same as that of the stirrer in the existing reverberation room, but the function of the first capacitive plate 2 is more diversified than that of the stirrer. The first horizontal equivalent capacitance and the first vertical equivalent capacitance act on the electric field components in the horizontal and vertical orthogonal directions, respectively, and if the two resonance modes have the horizontal and vertical electric field components, respectively, the equivalent lengths in the longitudinal direction of the shielding chamber 1 may be different for the two modes; further, if a resonant mode has both horizontal and vertical electric field components, the different field components correspond to different longitudinal equivalent lengths for such mode. These different longitudinal equivalent length effects may result in a more diverse "stirring" averaging effect not available with existing stirrers.
The working principle of the second capacitor plate 3 is the same as that of the first capacitor plate 2.
Because the first horizontal equivalent capacitor, the first vertical equivalent capacitor, the second horizontal equivalent capacitor and the second vertical equivalent capacitor can be electrically controlled to change, the change rate can be far greater than the stirring rate of the mechanical stirrer. When the first capacitor plate and the second capacitor plate 3 are operated simultaneously, the two equivalent short-circuit surfaces of the shielding chamber 1 can be moved in the same direction, and the two equivalent short-circuit surfaces of the shielding chamber 1 can be moved in opposite directions, so that the increased average operation mode is realized. Therefore, the averaging effect of the first capacitor plate 2 and the second capacitor plate 3 on the field intensity of the test area is better.
The first capacitor plate 2 and the second capacitor plate 3 are detachable, and the first capacitor plate 2 or the second capacitor plate 3 can be taken out of the shielding chamber 1, and the reverberation chamber can also work. In the shielding compartment 1, there may be a plurality of mounting positions of the first capacitor plate 2 or the second capacitor plate 3 in the longitudinal position. It is also possible to place a plurality of first capacitor plates 2 or second capacitor plates 3 at different locations in the shielded room 1, which in this case corresponds toLThe effect of the first capacitor plate 2 or the second capacitor plate 3 is more obvious.
The equivalent capacitance of the first capacitor plate 2 or the second capacitor plate 3 according to equation (2)CThe larger the effect of the reinforcing action of the first capacitor plate 2 or the second capacitor plate 3 is, the larger the effect is.
The first side 13, the second side 14, the top 16 and the bottom 15 of the shielding chamber 1 are provided with connecting means, which on the one hand allow the first capacitive plate 2 and the second capacitive plate 3 to be mounted in the shielding chamber 1 and ensure that the first capacitive network 20 of the first capacitive plate 2 is electrically connected to the first side 13, the second side 14, the top 16 and the bottom 15 and the second capacitive network 30 of the second capacitive plate 3 is electrically connected to the first side 13, the second side 14, the top 16 and the bottom 15, and on the other hand ensure that the first capacitive plate 2 and the second capacitive plate 3 can be removed and replaced.
The first capacitor plate 2 and the second capacitor plate 3 may be formed by a printed circuit board process, on which a plurality of capacitors are soldered to form the first capacitor network 20 and the second capacitor network 30. The capacitance is distributed throughout the first capacitor plate 2 and the second capacitor plate 3 to ensure that the electric field strength is capacitive at all locations during the multiple modes. Since the effect of the first 2 and second 3 capacitive plates is mainly for several modes around the lowest frequency of the reverberation chamber, the highest available frequency of the capacitor generally only needs to be more than three times the lowest operating frequency of the reverberation chamber, and the first 2 and second 3 capacitive plates will have a significant effect.
The capacitance of the first capacitor plate 2 and the second capacitor plate 3 may be a lumped parameter capacitance, but when the operating frequency is high, the required equivalent capacitance value may be realized by a distributed parameter capacitance such as a metal gap.
The present invention can be realized in light of the above.
The above description is intended only to illustrate the present invention and not to limit the present invention, and any modifications, equivalents, improvements, etc. within the principle and scope of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A whistlesrless reverberation chamber characterized in that the reverberation chamber comprises a shielded chamber (1), a first capacitive plate (2), a second capacitive plate (3) and an antenna (4); the shielding chamber (1) is internally shaped like a cuboid and comprises six wall surfaces including a front wall (11), a rear wall (12), a first side wall (13), a second side wall (14), a bottom surface (15) and a top surface (16); the first capacitor plate (2) and the second capacitor plate (3) are both positioned in the shielding chamber (1); a first capacitor network (20) on the first capacitor plate (2) forms two equivalent capacitors, one being a first horizontal equivalent capacitor terminated between the first sidewall (13) and the second sidewall (14) and the other being a first vertical equivalent capacitor terminated between the bottom surface (15) and the top surface (16); the capacitance values of the first horizontal equivalent capacitor and the first vertical equivalent capacitor can be changed during the operation of the reverberation chamber; a second capacitor network (30) on the second capacitor plate (3) forms two equivalent capacitances, one being a second horizontal equivalent capacitance terminating between the first sidewall (13) and the second sidewall (14); the other is a second vertical equivalent capacitance terminated between the bottom surface (15) and the top surface (16); the capacitance values of the second horizontal equivalent capacitor and the second vertical equivalent capacitor can be changed during the operation of the reverberation chamber; the antenna (4) is positioned in the shielding chamber (1).
2. The whistlesrless reverberation chamber of claim 1, characterized in that the first capacitive plate (2) is parallel to the front wall (11), electrically connected to the first side wall (13) and the second side wall (14); the second capacitor plate (3) is parallel to the rear wall (12) and is electrically connected to the bottom surface (15) and the top surface (16).
3. The whistlesrless reverberation chamber of claim 1, characterized in that the distance of the first capacitive plate (2) to the front wall (11) is adjustable, the distance of the first capacitive plate (2) to the front wall (11) being smaller than the distance of the first capacitive plate (2) to the rear wall (12); the distance between the second capacitor plate (3) and the rear wall (12) can be adjusted, and the distance between the second capacitor plate (3) and the rear wall (12) is smaller than the distance between the second capacitor plate (3) and the front wall (11).
4. The whistles-free reverberation chamber of claim 1, wherein the larger the capacitance values of the first horizontal equivalent capacitance, the first vertical equivalent capacitance, the second horizontal equivalent capacitance and the second vertical equivalent capacitance, the lower the operating frequency of the reverberation chamber.
5. The whistles-free reverberation chamber of claim 1, characterized in that different first capacitive plates (2) can be exchanged for different operating frequencies, the capacitance values of the first horizontal equivalent capacitances of the first capacitive plates (2) having different ranges of variation, the capacitance values of the first vertical equivalent capacitances of the first capacitive plates (2) having different ranges of variation; different second capacitor plates (3) can be used instead according to different working frequencies, the capacitance values of the second horizontal equivalent capacitors of the second capacitor plates (3) have different variation ranges, and the capacitance values of the second vertical equivalent capacitors of the second capacitor plates (3) have different variation ranges.
6. The whistles less reverberation chamber of claim 1, wherein the capacitance values of the first horizontal equivalent capacitance, the first vertical equivalent capacitance, the second horizontal equivalent capacitance and the second vertical equivalent capacitance can be rapidly switched by electrically controlled switches.
7. The whistlestless reverberation chamber of claim 1, characterized in that the capacitance of the first capacitance plate (2) can be provided by a varactor, the capacitance values of the first horizontal equivalent capacitance and the first vertical equivalent capacitance being varied by varying the bias voltage of the varactor.
8. The whistles-free reverberation chamber of claim 1, characterized in that the capacitance of the second capacitive plate (3) can be provided by a varactor, the capacitance values of the second horizontal equivalent capacitance and the second vertical equivalent capacitance being varied by varying the bias voltage of the varactor.
9. The whistlesrless reverberation chamber of claim 1 wherein the first capacitive plate (2) and the second capacitive plate (3) are used simultaneously in the shielded chamber (1) or only one of the first capacitive plate (2) and the second capacitive plate (3) is used.
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| CN202220786790.0U CN217587420U (en) | 2022-04-07 | 2022-04-07 | Whistles-free reverberation chamber |
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