CN210958867U - Electrically tunable antenna structure for changing microwave electric field distribution - Google Patents
Electrically tunable antenna structure for changing microwave electric field distribution Download PDFInfo
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- CN210958867U CN210958867U CN201920905605.3U CN201920905605U CN210958867U CN 210958867 U CN210958867 U CN 210958867U CN 201920905605 U CN201920905605 U CN 201920905605U CN 210958867 U CN210958867 U CN 210958867U
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Abstract
The utility model discloses an electricity is transferred antenna structure for changing microwave electric field distributes, wherein, including microwave oven cavity and radio frequency antenna, radio frequency antenna one end sets up in the microwave oven cavity, the other end is connected with drive mechanism, drive mechanism is connected with drive arrangement, through the drive arrangement drive mechanism changes the radio frequency antenna with the relative position of microwave oven cavity, the utility model discloses to placing the food load that changes in the microwave oven cavity, use electricity is transferred antenna structure and is changed the load and match and make standing wave VSWR can be optimum to absorb the microwave energy conversion by the food load with the highest efficiency.
Description
Technical Field
The utility model relates to a microwave oven field especially relates to an antenna structure is transferred to electricity for changing microwave electric field distribution.
Background
The traditional microwave oven uses a magnetron to generate microwave energy, the microwave energy is coupled to a waveguide and then transmitted into a cavity to heat food, and a relatively large cavity size is needed for forming a multi-mode field, so that the microwave heating uniformity can be ensured. Compared with a magnetron, the solid-state microwave source has many technical advantages as a new microwave energy source, such as DC power supply, controllable and detectable output power and reflected power, and adjustable frequency and phase, and the measures enable precise heating and directional heating. Solid-state source microwaves are fed in a plurality of ways, and a coaxial waveguide transmission mode is common, and a resonant antenna feeding way is also common. Because the dielectric constant of various foods is different, the load that forms in the cavity matches also inequality, leads to the matching between resonant antenna and the load to be a fixed value, and how to let resonant antenna initiative adaptation load match is the utility model discloses the key problem that will solve.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned prior art not enough, the utility model aims at providing an antenna structure is transferred to electricity for changing microwave electric field distribution aims at solving the problem that radio frequency antenna initiative adaptation load matches.
The technical scheme of the utility model as follows:
the utility model provides an electrically tunable antenna structure for changing microwave electric field distributes, wherein, includes microwave oven cavity and radio frequency antenna, radio frequency antenna one end sets up in the microwave oven cavity, the other end is connected with drive mechanism, drive mechanism is connected with drive arrangement, through the drive arrangement drive mechanism changes the radio frequency antenna with the relative position of microwave oven cavity.
The electric tuning antenna structure for changing the distribution of the microwave electric field is characterized in that one end of the radio frequency antenna, which is positioned outside the microwave oven cavity, is arranged in the shielding ball shaft sleeve.
The electrically tunable antenna structure for changing the distribution of the microwave electric field is characterized in that a limit switch is arranged between the transmission mechanism and the microwave oven cavity, and the radio frequency antenna is positioned through the limit switch.
The electric tuning antenna structure for changing the distribution of the microwave electric field is characterized in that the radio frequency antenna, the transmission mechanism, the driving device, the shielding ball shaft sleeve and the limit switch are all arranged at the top end of the cavity of the microwave oven.
The electrically tunable antenna structure for changing the distribution of the microwave electric field is characterized in that the radio frequency antenna comprises an antenna body, a radio frequency coaxial connector, a limiting shaft clamp and an antenna disc, and the antenna disc is arranged in the cavity of the microwave oven.
The electric tuning antenna structure for changing the distribution of the microwave electric field is characterized in that the transmission mechanism comprises an eccentric wheel and a connecting rod, the eccentric wheel is driven to rotate through a driving device, and a radio frequency coaxial connector of a radio frequency antenna is driven, so that an antenna body and an antenna disc are driven to move up and down in a cavity of the microwave oven.
The electrically tunable antenna structure for changing the distribution of the microwave electric field is characterized in that the eccentric wheels comprise two groups, one group of eccentric wheels is connected with the driving device and the other group of eccentric wheels through a connecting rod, and the other group of eccentric wheels is connected with the radio frequency coaxial connector.
The electrically tunable antenna structure for changing the distribution of the microwave electric field is characterized in that the inner wall of the cavity of the microwave oven is made of a good metal conductor material to form a microwave shielding and reflecting surface.
The electrically tunable antenna structure for changing the distribution of the microwave electric field is characterized in that the sectional area of the antenna disc is larger than that of the antenna body.
The electrically tunable antenna structure for changing the distribution of the microwave electric field is characterized in that the driving device is a stepping motor.
Has the advantages that: the utility model discloses an electricity is transferred antenna structure for changing microwave electric field distributes, wherein, including microwave oven cavity and radio frequency antenna, radio frequency antenna one end sets up in the microwave oven cavity, the other end is connected with drive mechanism, drive mechanism is connected with drive arrangement, through the drive arrangement drive mechanism changes the radio frequency antenna with the relative position of microwave oven cavity, the utility model discloses to placing the food load that changes in the microwave oven cavity, use electricity is transferred antenna structure and is changed the load and match and make standing wave VSWR can be optimum to absorb the microwave energy conversion by the food load with the highest efficiency.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic diagram of an electrically tunable antenna structure for changing the distribution of a microwave electric field.
Detailed Description
The utility model provides an electricity is transferred antenna structure for changing microwave electric field distributes, for making the utility model discloses a purpose, technical scheme and effect are clearer, more clear and definite, it is following right the utility model discloses further detailed description. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Please refer to fig. 1, which is the schematic diagram of an electrical modulation antenna structure for changing the distribution of microwave electric field, the utility model discloses an electrical modulation antenna structure for changing the distribution of microwave electric field, wherein, including microwave oven cavity 101 and rf antenna 102, rf antenna 102 one end sets up in microwave oven cavity 101, the other end is connected with drive mechanism 103, drive mechanism 103 is connected with drive arrangement 104, through drive arrangement 104 drives drive mechanism 103, changes rf antenna 102 with the relative position of microwave oven cavity 101.
Further, the electrically tunable antenna structure for changing the distribution of the microwave electric field is characterized in that one end of the radio frequency antenna 102, which is located outside the cavity 101 of the microwave oven, is disposed in the shielding ball shaft sleeve 105.
The shielding ball shaft sleeve is composed of an outer side metal shaft sleeve and an inner side ball shaft sleeve, movable metal ball particles are densely distributed on the ball shaft sleeve, the inner side ball shaft sleeve is connected with the outer side metal shaft sleeve and the radio frequency coaxial connector shell through the metal ball particles, on one hand, good grounding is provided to play a role in shielding radio frequency signals, on the other hand, the movement friction is reduced to enable the radio frequency antenna to move smoothly in the shaft sleeve, and the service life is prolonged.
Further, the electrically tunable antenna structure for changing the distribution of the microwave electric field is characterized in that a limit switch 106 is arranged between the transmission mechanism 103 and the microwave oven cavity 101, and the radio frequency antenna 102 is positioned through the limit switch 106.
The driving device and the limit switch are used for marking the position of the radio frequency antenna in vertical movement.
The beneficial effect of the above-mentioned further scheme lies in that standardized food load can calibrate best load matching corresponding antenna position through a large amount of tests, can accomplish accurate rapid heating.
Further, the electric tuning antenna structure for changing the distribution of the microwave electric field is characterized in that the radio frequency antenna 102, the transmission mechanism 103, the driving device 104, the shielding ball shaft sleeve 105 and the limit switch 106 are all arranged at the top end of the cavity of the microwave oven.
The utility model discloses preferred embodiment, the microwave oven cavity is the single mode cavity, and the electricity is transferred the antenna and is installed directly over microwave oven cavity food loading end.
The further scheme has the beneficial effects that the electrically-adjusted antenna forms a standard circular microwave strong field for the food load at the center below from the right top, so that the food can obtain microwave energy more uniformly.
Further, the electric tilt antenna structure for changing the distribution of the microwave electric field, wherein the radio frequency antenna 102 includes an antenna body, a radio frequency coaxial connector 201, a limiting shaft clamp 202 and an antenna disc 203, and the antenna disc 203 is disposed in the microwave oven cavity 101.
A shaft clamping groove is designed on the shielding shell of the radio frequency antenna close to the antenna disk end, and a limiting shaft clamp 202 is installed.
The beneficial effect of the above-mentioned further scheme is that, spacing axle card 202 can effectively protect antenna panel not because of unexpected condition and microwave oven chamber chassis ground contact, lead to striking sparks or energy leakage.
Further, the electric tilt antenna structure for changing the distribution of the microwave electric field, wherein the transmission mechanism 103 includes an eccentric wheel 301 and a connecting rod 302, and the driving device 104 drives the eccentric wheel 301 to rotate to drive the radio frequency coaxial connector 201 of the radio frequency antenna, so as to drive the antenna body and the antenna disc 203 to move up and down in the microwave oven cavity 101.
Further, the electrically tunable antenna structure for changing the distribution of the microwave electric field is characterized in that the eccentric wheels 301 comprise two groups, one group of eccentric wheels 301 is connected with the driving device 104 and is connected with the other group of eccentric wheels 301 through a connecting rod 302, and the other group of eccentric wheels 301 is connected with the radio frequency coaxial connector 201.
The utility model discloses preferred embodiment, drive mechanism belongs to reciprocal connecting rod structure, because the special construction of eccentric wheel, drive arrangement drives one of them eccentric wheel and rotates, and the connecting rod drives the eccentric wheel of second group and rotates to realize reciprocating motion.
The further scheme has the advantages that the reciprocating connecting rod structure determines the highest point and the lowest point of the antenna stroke, and the antenna reciprocates in the stroke forever, so that the safe and reliable operation of the whole high-power radio frequency link is ensured.
Further, the electrically tunable antenna structure for changing the distribution of the microwave electric field is characterized in that the microwave oven cavity 101 is made of a metal good conductor material to form a microwave shielding and reflecting surface 107.
Further, the electrically tunable antenna structure for changing the distribution of the microwave electric field is configured, wherein the sectional area of the antenna disc 203 is larger than the sectional area of the antenna body.
Antenna structure, preferably the sectional area of antenna disc is greater than the sectional area of antenna body, the preferred circular shape of structure of antenna disc.
Further, the electrically tunable antenna structure for changing the distribution of the microwave electric field is provided, wherein the driving device 104 is a stepping motor.
Antenna structure, preferred drive arrangement is step motor.
The preferred embodiment of the present invention, microwave energy is fed into the cavity from the rf antenna to form a standing wave field, the standing wave coefficient depends on the food load, and the load matching formed by the antenna shape and the cavity size, and whether matching determines the efficiency of microwave energy feeding. And the utility model discloses can change the load with the electricity accent antenna of design and match to the food load of change in the microwave oven cavity and make standing wave VSWR can be optimum to absorb the microwave energy conversion by the food load with the highest efficiency.
The utility model aims to provide a: the designed electrically-tunable resonant antenna detects standing waves through antenna reflection power, and the resonant antenna is accurately controlled by a stepping motor according to the standing waves to change the depth of the antenna so as to match a load, and meanwhile, the antenna has good radio frequency shielding performance. The method specifically comprises the following steps:
(1) and the stepping motor drives the transmission mechanical structure to enable the radio frequency antenna to move, and receives an instruction from the MCU to change the azimuth angle so as to accurately control the position of the antenna.
(2) And the limit switch is matched with an eccentric wheel in the transmission mechanism to provide origin detection for calibrating the position of the radio-frequency antenna.
(3) And the transmission mechanism consists of an eccentric wheel, a connecting rod and a matched limit screw, realizes power transmission between the stepping motor and the radio-frequency antenna and drives the radio-frequency antenna to reciprocate in the vertical direction.
(4) The radio frequency antenna comprises a radio frequency coaxial connector, a limiting shaft clamp and an antenna disc, and the feeding of radio frequency microwave signals is realized.
(5) The shielding ball shaft sleeve comprises an outer side shaft sleeve and an inner measuring ball shaft sleeve, and the radio frequency antenna moves in the shaft sleeve smoothly and is well grounded, so that a better radio frequency signal shielding effect is realized.
(6) The microwave oven comprises a microwave oven cavity, a microwave energy source and a control circuit, wherein the microwave oven cavity is used for placing a food load, and the microwave energy is radiated from a radio frequency antenna into the cavity to finally form a standing wave field.
In some embodiments, the electrically tunable antenna is mounted directly above the microwave oven cavity.
Specifically, the gap between the radio frequency antenna in the cavity of the microwave oven and the reference ground of the top surface has the maximum distance and the minimum distance, and the difference between the maximum distance and the minimum distance is equal to the diameter R of the circular motion of the eccentric wheel driving rod.
Specifically, the eccentric wheel can be provided with connecting rod fixing holes with different movement diameters R according to actual requirements.
In some embodiments, the rf antenna has an antenna disk that is variable in shape, and the antenna disk is customized to different shapes and sizes depending on the desired illuminated food load range and distance. The radiation characteristic can be obtained by HFSS simulation.
In some embodiments, the shape and dimensions of the cavity are determined by the desired frequency, and the most suitable matching dimensions can be obtained by HFSS simulation to ensure that the frequency microwave source forms a standing wave in the cavity, which is determined by the characteristics of the electromagnetic wave itself.
In some embodiments, the food load is generally placed directly under the rf antenna, rf energy is fed into the cavity of the microwave oven through the rf antenna, a circular electric field is formed around the food, and how much microwave the food load absorbs depends on factors such as the dielectric constant of the load and the weight of the food.
Specifically, when the food load and the electric field are mismatched, the power reflected back to the solid-state source power amplifier from the antenna becomes large, the best matching between the antenna and the food load can be found again by changing the depth of the antenna through electrically adjusting the antenna, and the power output under the best matching is obtained again by setting the output frequency of the power amplifier.
To sum up, the utility model discloses an electricity is transferred antenna structure for changing microwave electric field distributes, wherein, including microwave oven cavity and radio frequency antenna, radio frequency antenna one end sets up in the microwave oven cavity, the other end is connected with drive mechanism, drive mechanism is connected with drive arrangement, through the drive arrangement drive mechanism changes the radio frequency antenna with the relative position of microwave oven cavity, the utility model discloses to placing the food load that changes in the microwave oven cavity, use electricity is transferred antenna structure and is changed the load and match and make standing wave VSWR can be optimum to absorb the microwave energy conversion by the food load with highest efficiency.
It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides an electricity is transferred antenna structure for changing microwave electric field distributes, its characterized in that, includes microwave oven cavity and radio frequency antenna, radio frequency antenna one end sets up in the microwave oven cavity, the other end is connected with drive mechanism, drive mechanism is connected with drive arrangement, through the drive arrangement drive mechanism, change radio frequency antenna with the relative position of microwave oven cavity.
2. The electrically tunable antenna structure for changing the distribution of the electric field of microwaves as claimed in claim 1, wherein the end of the radio frequency antenna located outside the cavity of the microwave oven is disposed inside the shielding ball sleeve.
3. The electrically tunable antenna structure for changing the distribution of microwave electric field according to claim 2, wherein a limit switch is disposed between the transmission mechanism and the cavity of the microwave oven, and the radio frequency antenna is positioned by the limit switch.
4. The electrically tunable antenna structure for changing the distribution of microwave electric field according to claim 3, wherein the radio frequency antenna, the transmission mechanism, the driving device, the shielding ball bearing sleeve and the limit switch are all disposed at the top end of the cavity of the microwave oven.
5. The structure of an electrically tunable antenna for changing the distribution of microwave electric field according to claim 1, wherein the radio frequency antenna comprises an antenna body, a radio frequency coaxial connector, a limiting shaft clamp and an antenna disk, and the antenna disk is disposed in the cavity of the microwave oven.
6. The structure of claim 5, wherein the transmission mechanism comprises an eccentric wheel and a connecting rod, and the driving device drives the eccentric wheel to rotate, so as to drive the RF coaxial connector of the RF antenna, and thus the antenna body and the antenna disc to move up and down in the cavity of the microwave oven.
7. An electrically tunable antenna structure for changing the distribution of microwave electric field according to claim 6, characterized in that the eccentric wheels comprise two sets, wherein one set of eccentric wheels is connected with the driving device and is connected with the other set of eccentric wheels through a connecting rod, and the other set of eccentric wheels is connected with the radio frequency coaxial connector.
8. An electrically tunable antenna structure for changing the distribution of microwave electric field according to claim 1, characterized in that the microwave oven cavity inner wall forms a microwave shielding and reflecting surface.
9. An electrically tunable antenna structure for changing the distribution of microwave electric field according to claim 5, characterized in that the cross-sectional area of the antenna disc is larger than the cross-sectional area of the antenna body.
10. An electrically tunable antenna structure for changing the distribution of the electric field of microwaves according to claim 1, wherein the driving means is a stepping motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920905605.3U CN210958867U (en) | 2019-06-14 | 2019-06-14 | Electrically tunable antenna structure for changing microwave electric field distribution |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920905605.3U CN210958867U (en) | 2019-06-14 | 2019-06-14 | Electrically tunable antenna structure for changing microwave electric field distribution |
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| CN210958867U true CN210958867U (en) | 2020-07-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110139417A (en) * | 2019-06-14 | 2019-08-16 | 深圳市博威射频科技有限公司 | A kind of electrical tilt antenna structure for changing microwave electric field distribution |
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2019
- 2019-06-14 CN CN201920905605.3U patent/CN210958867U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110139417A (en) * | 2019-06-14 | 2019-08-16 | 深圳市博威射频科技有限公司 | A kind of electrical tilt antenna structure for changing microwave electric field distribution |
| WO2020249082A1 (en) * | 2019-06-14 | 2020-12-17 | 深圳市博威射频科技有限公司 | Electric adjusting antenna structure for changing microwave electric field distribution |
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