Stirrerless reverberation chamber
By setting an adjustable capacitor plate in the reverberation chamber to form an equivalent capacitor network, the problem of large power consumption of the agitator and difficulty in meeting the high frequency electromagnetic field uniformity in the prior art is solved, and the electromagnetic field uniformization and frequency improvement of the agitator-free reverberation chamber are achieved.
Patent Information
- Application Number
- CN202210358623.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-04-07
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2042-04-07
AI Technical Summary
In the electromagnetic compatibility test, the existing reverb chambers are limited by the mechanical movement of the agitator due to the structural size, which consumes a lot of power and is difficult to meet the requirements of high-frequency electromagnetic field uniformity.
Using a stirrer-free reverberation chamber, by providing adjustable first and second capacitance plates in the shielding chamber, a variable equivalent capacitance network is formed, thereby achieving uniformization of the electromagnetic field and increasing frequency.
It realizes uniformization of the electromagnetic field in the reverberation chamber without using a mechanical agitator, improves the averaged frequency and mode, saves power loss, and reduces the minimum operating frequency of the reverberation chamber.
Smart Images
Figure CN114675112B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to electromagnetic compatibility testing, in particular to a stirrer-free reverberation chamber. Background Art
[0002] In the electromagnetic compatibility test, the test piece needs to be placed in a uniform electromagnetic field, and the test device needs to be shielded to avoid interference with the external environment. Therefore, electromagnetic compatibility testing usually needs to be carried out in an anechoic chamber or a reverberation chamber. Compared with the two, the test efficiency of the anechoic chamber is relatively low, and it is mainly used for the measurement of large devices. With the application of a large number of new technologies such as 5G communications, self-driving cars, electronic tags, and power carriers, many products need to undergo comprehensive electromagnetic compatibility testing, and reverberation chambers are often the preferred test environment.
[0003] As an electromagnetic compatibility measurement device, the existing reverberation chamber includes a shielded room, an indoor agitator and an excitation antenna. The shielded room can shield the test device from external interference. In order to achieve this shielding, the isolation material of the shielded room is metal. In this way, the shielded room, i.e., the reverberation chamber, is equivalent to a metal resonant cavity. The electromagnetic field in the cavity presents a standing wave distribution, and the electromagnetic field uniformity is poor, which cannot meet the test requirements of electromagnetic compatibility radio frequency radiation immunity. The role of the indoor agitator is to randomly change the boundary position of the shielded room, which is equivalent to randomly changing the position of the boundary short-circuit electrical wall, and then randomly changing the resonant wavelength and field distribution of the resonant mode, so as to achieve the uniformity of the electromagnetic field distribution in the sense of time statistical average in the test area.
[0004] In principle, the function of the stirrer is equivalent to mechanically changing the position of a short-circuit electrical wall of the resonator. The stroke of the stirrer determines the range of variation of the mode resonance wavelength, the range of variation of the voltage wave node, and thus 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 size. The power of the stirrer determines the stirring frequency of the stirrer and determines the stirring average frequency of the electromagnetic field amplitude distribution in the test area. The larger the frequency, the better the averaging effect, but the larger the frequency, the greater the driving power requirement for the stirrer, especially in larger reverberation chambers, which consume more power. Summary of the invention
[0005] Technical problem: The present invention proposes a stirrer-free reverberation chamber, which can achieve the electrical effect of the stirrer in the reverberation chamber without using a mechanical stirrer, realize the electromagnetic field averaging in the test area of the reverberation chamber, increase the averaging frequency, increase the averaging mode, and save power loss at the same time.
[0006] Technical solution:
[0007] The stirrerless reverberation chamber of the present invention is characterized in that the implementation scheme adopted in the present invention is as follows: The stirrerless reverberation chamber includes a shielding chamber, a first capacitor plate, a second capacitor plate and an antenna; The inner shape of the shielding chamber is a cuboid, with a front wall, a rear wall, a first side wall, a second side wall, a bottom surface and a top surface, a total of six walls; Both the first capacitor plate and the second capacitor plate are located inside the shielding chamber; The capacitor network on the first capacitor plate forms two equivalent capacitors, one is a first horizontal equivalent capacitor terminated between the first side wall and the second side wall, and the other is a first vertical equivalent capacitor terminated between the bottom surface and the top surface; During the operation of the reverberation chamber, the capacitance values of the first horizontal equivalent capacitor and the first vertical equivalent capacitor can be changed; The capacitor network on the second capacitor plate forms two equivalent capacitors, one is a second horizontal equivalent capacitor terminated between the first side wall and the second side wall; The other is a second vertical equivalent capacitor terminated between the bottom surface and the top surface; During the operation of the reverberation chamber, the capacitance values of the second horizontal equivalent capacitor and the second vertical equivalent capacitor can be changed; The antenna is located inside the shielding chamber.
[0008] The first capacitor plate is parallel to the front wall and electrically connected to 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 surface and the top surface.
[0009] The distance between the first capacitor plate and the front wall can be adjusted, and the distance between the first capacitor plate and the front wall is less than the distance between the first capacitor plate and the rear wall; The distance between the second capacitor plate and the rear wall can be adjusted, and the distance between the second capacitor plate and the rear wall is less than the distance between the second capacitor plate and the front wall.
[0010] 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 operating frequency of the reverberation chamber is.
[0011] Different first capacitor plates can be used according to different operating frequencies. The capacitance values of the first horizontal equivalent capacitors of these first capacitor plates have different change ranges, and the capacitance values of the first vertical equivalent capacitors of these first capacitor plates have different change ranges; Different second capacitor plates can be used according to different operating frequencies. The capacitance values of the second horizontal equivalent capacitors of these second capacitor plates have different change ranges, and the capacitance values of the second vertical equivalent capacitors of these second capacitor plates have different change ranges.
[0012] 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 quickly switched through an electronic control switch.
[0013] The capacitance of the first capacitor plate can be provided by a varactor diode. By changing the bias voltage of the varactor diode, the capacitance values of the first horizontal equivalent capacitor and the first vertical equivalent capacitor are changed.
[0014] The capacitance of the second capacitor plate may be provided by a varactor, and the capacitance values of the second horizontal equivalent capacitor and the second vertical equivalent capacitor may be changed by changing the bias voltage of the varactor.
[0015] The first capacitor plate and the second capacitor plate may be used in the shielding room at the same time, or only one of the first capacitor plate and the second capacitor plate may be used.
[0016] In the agitator-free reverberation chamber, the shielded room constitutes a rectangular metal resonance cavity. The front wall and the rear wall act as a short circuit, and the direction from the front wall to the rear wall is called the longitudinal direction.
[0017] The function of the first capacitor plate in the shielded room can be explained by the transmission line equivalent circuit. At the location of the first capacitor plate, the front wall acts as an inductor. L According to the transmission line theory,
[0018] (1)
[0019] In the above formula, ω is the operating frequency, Z is the characteristic impedance, V is the phase velocity along the longitudinal direction, A is the distance from the front wall to the first capacitor plate, A Less than one quarter of the longitudinal wavelength. A The bigger, L The bigger; on the contrary L The larger the A At the location of the first capacitor plate, the equivalent capacitance of the first capacitor plate is C and L connected in parallel to form a total equivalent inductance L d .
[0020] (2)
[0021] set up .when hour, . The effect can also be achieved by using a distance from the first capacitor plate to A d is equivalent to a short road surface. ,so Therefore, the first capacitor plate is equivalent to increasing the equivalent length of the shielding room in the longitudinal direction, so that the equivalent length in the longitudinal direction is greater than the actual length of the shielding room in the longitudinal direction, thereby reducing the minimum operating frequency of the reverberation room.
[0022] when hour, , so the equivalent capacitance of the first capacitor plate is C and LIn parallel, an overall equivalent capacitance is actually formed. At this time, it is equivalent to the distance between the front wall and the first capacitor plate being greater than one-quarter of the longitudinal wavelength, which makes the equivalent length of the shielding chamber in the longitudinal direction greater than the situation.
[0023] For the mode with an electric field component in the horizontal direction from the first side wall to the second side wall, the equivalent capacitance C in formula (2) is the first horizontal equivalent capacitance of the first capacitor plate; for the mode with an electric field component in the vertical direction from the bottom surface to the top surface, the equivalent capacitance C in formula (2) is the first vertical equivalent capacitance of the first capacitor plate.
[0024] When the first horizontal equivalent capacitance or the second vertical equivalent capacitance of the first capacitor plate changes, according to formula (2), its effect is equivalent to a change in the equivalent length of the shielding chamber in the longitudinal direction. This effect is the same as that of the stirrer in the existing reverberation chamber, but the effect of the first capacitor plate is more diverse than that of the stirrer. The first horizontal equivalent capacitance and the second vertical equivalent capacitance act on the electric field components in the horizontal and vertical orthogonal directions respectively. If two resonant modes have horizontal and vertical electric field components respectively, then for these two modes, the equivalent length of the shielding chamber in the longitudinal direction can be different; furthermore, if a resonant mode has both horizontal and vertical electric field components at the same time, for this mode, different field components correspond to different longitudinal equivalent lengths. These different longitudinal equivalent length effects can bring a more diverse "stirring" averaging effect, which is not possessed by the existing stirrers.
[0025] The working principle of the second capacitor plate is the same as that of the first capacitor plate.
[0026] Since the first horizontal equivalent capacitance, the first vertical equivalent capacitance, the second horizontal equivalent capacitance, and the second vertical equivalent capacitance can all be electronically controlled to change, their change rate can be much greater than the stirring rate of the mechanical stirrer. When the first capacitor plate and the second capacitor plate work simultaneously, they can either move the two equivalent short-circuit surfaces of the shielding chamber in the same direction or move the two equivalent short-circuit surfaces of the shielding chamber in opposite directions, which increases the average working mode. Therefore, the first capacitor plate and the second capacitor plate have a better averaging effect on the field strength in the test area.
[0027] The first capacitor plate and the second capacitor plate are detachable. The first capacitor plate or the second capacitor plate can be removed from the shielding chamber, and at this time the reverberation chamber can also work. Inside the shielding chamber, along the longitudinal position, there can be multiple installation positions for the first capacitor plate or the second capacitor plate. Multiple first capacitor plates or second capacitor plates can also be placed at different positions inside the shielding chamber. At this time, it is equivalent to L a multi-stage amplifier, and the effect of the first capacitor plate or the second capacitor plate is more obvious.
[0028] According to formula (2), the equivalent capacitance of the first capacitor plate or the second capacitor plate C The larger it is, the greater the enhancement effect of the first capacitor plate or the second capacitor plate at this time.
[0029] The first side, the second side, the top surface and the bottom surface of the shielding room are provided with connecting devices. On the one hand, the first capacitor plate and the second capacitor plate can be installed in the shielding room, and the capacitive network of the first capacitor plate is ensured to be electrically connected to the first side, the second side, the top surface and the bottom surface, and the capacitive network of the second capacitor plate is ensured to be electrically connected to the first side, the second side, the top surface and the bottom surface. On the other hand, the first capacitor plate and the second capacitor plate can be disassembled and replaced.
[0030] Beneficial effects: The beneficial effects of the present invention are as follows: The proposed reverberation chamber without a stirrer can have the electrical effect of a stirrer in the reverberation chamber without using a mechanical stirrer, realizing the electromagnetic field averaging in the test area of the reverberation chamber, increasing the averaging frequency, increasing the averaging modes, saving power loss at the same time, expanding the equivalent length of the reverberation chamber, and reducing the lowest operating frequency of the reverberation chamber. Description of the Drawings
[0031] Figure 1 is a schematic diagram of the reverberation chamber without a stirrer of the present invention;
[0032] Figure 2 is a top view of the reverberation chamber without a stirrer of the present invention
[0033] Figure 3 is a schematic diagram of the first capacitor plate of the reverberation chamber without a stirrer of the present invention;
[0034] Figure 4 is a schematic diagram of the second capacitor plate of the reverberation chamber without a stirrer of the present invention;
[0035] In the figure, there are a shielding room 1, a first capacitor plate 2, a second capacitor 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 capacitive network 20, a capacitive network 30 and an antenna 4. Detailed Embodiments
[0036] The following further describes the detailed embodiments of the present invention in conjunction with the drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and cannot limit the present invention with specific embodiments.
[0037] The implementation scheme adopted by the present invention is as follows: The stirrer-free reverberation chamber includes a shielding chamber 1, a first capacitor plate 2, a second capacitor plate 3, and an antenna 4; The internal shape of the shielding chamber 1 is a cuboid, with six walls 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; Both the first capacitor plate 2 and the second capacitor plate 3 are located inside the shielding chamber 1; The capacitor network 20 on the first capacitor plate 2 forms two equivalent capacitors, one is the first horizontal equivalent capacitor terminated between the first side wall 13 and the second side wall 14, and the other is the first vertical equivalent capacitor terminated between the bottom surface 15 and the top surface 16; During the operation of the reverberation chamber, the capacitance values of the first horizontal equivalent capacitor and the first vertical equivalent capacitor can be changed; The capacitor network 30 on the second capacitor plate 3 forms two equivalent capacitors, one is the second horizontal equivalent capacitor terminated between the first side wall 13 and the second side wall 14; The other is the second vertical equivalent capacitor terminated between the bottom surface 15 and the top surface 16; During the operation of the reverberation chamber, the capacitance values of the second horizontal equivalent capacitor and the second vertical equivalent capacitor can be changed; The antenna 4 is located inside the shielding chamber 1.
[0038] The first capacitor plate 2 is parallel to the front wall 11 and 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 electrically connected to the bottom surface 15 and the top surface 16.
[0039] The distance between the first capacitor plate 2 and the front wall 11 can be adjusted, and the distance between the first capacitor plate 2 and the front wall 11 is less than the distance between the first capacitor plate 2 and 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 less than the distance between the second capacitor plate 3 and the front wall 11.
[0040] 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, the lower the operating frequency of the reverberation chamber.
[0041] Different first capacitor plates 2 can be replaced according to different operating frequencies. The capacitance values of the first horizontal equivalent capacitors of these first capacitor plates 2 have different change ranges, and the capacitance values of the first vertical equivalent capacitors of these first capacitor plates 2 have different change ranges; Different second capacitor plates 3 can be replaced according to different operating frequencies. The capacitance values of the second horizontal equivalent capacitors of these second capacitor plates 3 have different change ranges, and the capacitance values of the second vertical equivalent capacitors of these second capacitor plates 3 have different change ranges.
[0042] 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 quickly switched through an electric control switch.
[0043] The capacitance of the first capacitor plate 2 can be provided by a varactor. By changing the bias voltage of the varactor, the capacitance values of the first horizontal equivalent capacitance and the first vertical equivalent capacitance are changed.
[0044] The capacitance of the second capacitor plate 3 can be provided by a varactor. By changing the bias voltage of the varactor, the capacitance values of the second horizontal equivalent capacitance and the second vertical equivalent capacitance are changed.
[0045] The first capacitor plate 2 and the second capacitor plate 3 can be used simultaneously in the shielding chamber 1, or only one of the first capacitor plate 2 and the second capacitor plate 3 can be used.
[0046] In an anechoic chamber without a stirrer, the shielding chamber 1 forms a rectangular metal resonant cavity. The front wall 11 and the rear wall 12 act as short circuits, and the direction from the front wall 11 to the rear wall 11 is called the longitudinal direction.
[0047] The function of the first capacitor plate 2 in the shielding chamber 1 can be explained by an equivalent transmission line circuit. At the position of the first capacitor plate 2, the front wall 11 acts equivalently as an inductor L . According to the transmission line theory, there is
[0048] (1)
[0049] In the above formula, ω is the operating frequency, Z is the characteristic impedance, V is the phase velocity along the longitudinal direction, A is the distance from the front wall 11 to the first capacitor plate 2, A is less than one-quarter of the longitudinal wavelength. A The larger L is, the larger L is; conversely, the larger A is, which is equivalent to the larger C is. At the position of the first capacitor plate 2, the equivalent capacitance L of the first capacitor plate 2 is in parallel with L d .
[0050] (2)
[0051] Let . When , . The function of A d can also be equivalent to a short-circuit plane at a distance from the first capacitor plate 2. Since Therefore, the first capacitor plate 2 is equivalent to increasing the equivalent length of the shielding chamber 1 in the longitudinal direction, making the equivalent length in the longitudinal direction greater than the actual length of the shielding chamber 1 in the longitudinal direction. Therefore, the minimum operating frequency of the reverberation chamber is reduced.
[0052] When time, , in this way, the equivalent capacitance C of the first capacitor plate 2 L is in parallel with , actually forming a total equivalent capacitance. At this time, it is equivalent that the distance between the front wall 11 and the first capacitor plate 2 is greater than one-quarter of the longitudinal wavelength, so that the equivalent length of the shielding chamber 1 in the longitudinal direction is greater than
[0053] Case.
[0054] For the mode with an electric field component in the horizontal direction from the first side wall 13 to the second side wall 14, the equivalent capacitance C in formula (2) is the first horizontal equivalent capacitance of the first capacitor plate 2; for the mode with an electric field component in the vertical direction from the bottom surface 15 to the top surface 16, the equivalent capacitance C in formula (2) is the first vertical equivalent capacitance of the first capacitor plate 2.
[0055] The working principle of the second capacitor plate 3 is the same as that of the first capacitor plate 2.
[0056] Since the first horizontal equivalent capacitance, the first vertical equivalent capacitance, the second horizontal equivalent capacitance, and the second vertical equivalent capacitance can all be changed electronically, their change rate can be much greater than the stirring rate of the mechanical stirrer. When the first capacitor plate and the second capacitor plate 3 work simultaneously, they can move the two equivalent short-circuit surfaces of the shielding chamber 1 in the same direction or in opposite directions, which increases the average working mode. Therefore, the first capacitor plate 2 and the second capacitor plate 3 have a better averaging effect on the field strength in the test area.
[0057] The first capacitor plate 2 and the second capacitor plate 3 are detachable. The first capacitor plate 2 or the second capacitor plate 3 can be removed from the shielding chamber 1, and at this time, the reverberation chamber can also work. Inside the shielding chamber 1, along the longitudinal position, there can be multiple installation positions for the first capacitor plate 2 or the second capacitor plate 3. Multiple first capacitor plates 2 or second capacitor plates 3 can also be placed at different positions inside the shielding chamber 1. At this time, it is equivalent to L a multi-stage amplifier, and the effect of the first capacitor plate 2 or the second capacitor plate 3 is more obvious.
[0058] According to formula (2), the equivalent capacitance of the first capacitor plate 2 or the second capacitor plate 3 C is larger, and at this time, the enhancement effect of the first capacitor plate 2 or the second capacitor plate 3 is also larger.
[0059] The first side 13, the second side 14, the top surface 16, and the bottom surface 15 of the shielding chamber 1 are provided with connecting devices. On the one hand, the first capacitor plate 2 and the second capacitor plate 3 can be installed inside the shielding chamber 1, and the capacitance network 20 of the first capacitor plate 2 is ensured to be electrically connected to the first side 13, the second side 14, the top surface 16, and the bottom surface 15, and the capacitance network 30 of the second capacitor plate 3 is ensured to be electrically connected to the first side 13, the second side 14, the top surface 16, and the bottom surface 15. On the other hand, the first capacitor plate 2 and the second capacitor plate 3 can be disassembled and replaced.
[0060] The first capacitor plate 2 and the second capacitor plate 3 can be made by printed circuit board technology, and multiple capacitors are soldered on the substrate to form the capacitance network 20 and the capacitance network 30. The capacitors are distributed throughout the first capacitor plate 2 and the second capacitor plate 3 to ensure that there are capacitors at the positions where the electric field is strong in various modes. Since the effect of the first capacitor plate 2 and the second capacitor plate 3 mainly targets several modes near the lowest frequency of the reverberation chamber, for the highest available frequency of the capacitor, generally only need to be greater than three times the lowest operating frequency of the reverberation chamber, and the first capacitor plate 2 and the second capacitor plate 3 will produce significant effects.
[0061] The capacitance of the first capacitor plate 2 and the second capacitor plate 3 can be a lumped parameter capacitor, but when the operating frequency is high, the required equivalent capacitance value can be realized by distributed parameter capacitors such as metal slits.
[0062] According to the above, the present invention can be realized.
[0063] The above are only embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. within the design method and principles of the present invention shall be included in the protection scope of the present invention.
Claims
1. An anechoic chamber without a stirrer, characterized in that The reverberation chamber includes a shielding chamber (1), a first capacitor plate (2), a second capacitor plate (3) and an antenna (4); the internal shape of the shielding chamber (1) is a cuboid, having six walls 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); both the first capacitor plate (2) and the second capacitor plate (3) are located inside the shielding chamber (1); a first capacitor network (20) on the first capacitor plate (2) forms two equivalent capacitors, one is a first horizontal equivalent capacitor terminated between the first side wall (13) and the second side wall (14), and the other is a first vertical equivalent capacitor terminated between the bottom surface (15) and the top surface (16); during the operation of the reverberation chamber, the capacitance values of the first horizontal equivalent capacitor and the first vertical equivalent capacitor can be changed; a second capacitor network (30) on the second capacitor plate (3) forms two equivalent capacitors, one is a second horizontal equivalent capacitor terminated between the first side wall (13) and the second side wall (14); the other is a second vertical equivalent capacitor terminated between the bottom surface (15) and the top surface (16); during the operation of the reverberation chamber, the capacitance values of the second horizontal equivalent capacitor and the second vertical equivalent capacitor can be changed; the antenna (4) is located inside the shielding chamber (1). The first capacitor plate (2) is parallel to the front wall (11) and 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 electrically connected to the bottom surface (15) and the top surface (16). The distance between the first capacitor plate (2) and the front wall (11) can be adjusted, and the distance between the first capacitor plate (2) and the front wall (11) is less than the distance between the first capacitor plate (2) and 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 less than the distance between the second capacitor plate (3) and the front wall (11).
2. The reverberation chamber without a stirrer according to claim 1, wherein 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 operating frequency of the reverberation chamber is.
3. The reverberation chamber without a stirrer according to claim 1, characterized in that According to different operating frequencies, different first capacitor plates (2) are used. The capacitance values of the first horizontal equivalent capacitors of these first capacitor plates (2) have different change ranges, and the capacitance values of the first vertical equivalent capacitors of these first capacitor plates (2) have different change ranges; according to different operating frequencies, different second capacitor plates (3) are used. The capacitance values of the second horizontal equivalent capacitors of these second capacitor plates (3) have different change ranges, and the capacitance values of the second vertical equivalent capacitors of these second capacitor plates (3) have different change ranges.
4. The reverberation chamber without a stirrer according to claim 1, characterized in that Through an electronic control switch, 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 quickly switched.
5. The reverberation chamber without a stirrer according to claim 1, characterized in that The capacitance of the first capacitor plate (2) is provided by a varactor diode. By changing the bias voltage of the varactor diode, the capacitance values of the first horizontal equivalent capacitor and the first vertical equivalent capacitor are changed.
6. The reverberation chamber without a stirrer according to claim 1, characterized in that The capacitance of the second capacitor plate (3) is provided by a varactor diode. By changing the bias voltage of the varactor diode, the capacitance values of the second horizontal equivalent capacitance and the second vertical equivalent capacitance are changed.
7. The reverberation chamber without a stirrer according to claim 1, characterized in that The first capacitor plate (2) and the second capacitor plate (3) can be used simultaneously in the shielding chamber (1), or only one of the first capacitor plate (2) and the second capacitor plate (3) can be used.
Citation Information
Patent Citations
Blender-free reverberation chamber
CN217587420U