CN213041986U - Circuit for realizing transmitting-receiving integrated microwave detection antenna and detection module - Google Patents
Circuit for realizing transmitting-receiving integrated microwave detection antenna and detection module Download PDFInfo
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- CN213041986U CN213041986U CN202021698927.4U CN202021698927U CN213041986U CN 213041986 U CN213041986 U CN 213041986U CN 202021698927 U CN202021698927 U CN 202021698927U CN 213041986 U CN213041986 U CN 213041986U
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Abstract
The utility model provides a realize receiving and dispatching microwave detection antenna's of unification circuit and detection module, including an integrated chip and a microwave detection antenna, integrated chip includes 1 microwave transmission excitation output foot and 1 echo detection input foot, microwave transmission and echo reception sharing microwave detection antenna, microwave transmission excitation output foot is connected with microwave detection antenna's feed point through the transmission electric capacity on the route of transmission, echo detection input foot is connected with microwave detection antenna's feed point through receiving inductance or receiving resistance on the route of reception. The microwave detection antenna and the feed point are shared by different characteristics of the capacitor and the inductor, the separation of transmitting microwave signals and receiving echo signals is realized, the phase difference between the transmitted microwave signals and the received echo signals is 180 degrees, the attenuation of the received reflected echo signals is extremely low, and the detection of the reflected echo signals is favorably ensured. The microwave detection antenna is reduced, half of the size of the microwave detection antenna is reduced, and the possibility of miniaturization of the detection module is greatly improved.
Description
Technical Field
The utility model relates to a microwave detection field, more specifically say and relate to a circuit and detection module that realize receiving and dispatching unification microwave detection antenna.
Background
Microwave detection technology is widely applied to the field of automatic control, and a microwave detection module is a core component applied to the application field. The microwave detection principle is that a circuit generates a microwave emission excitation signal, the microwave emission excitation signal is connected to a microwave emission antenna through a feed point to generate detection microwaves in all directions or in a certain direction, and the detection microwaves are reflected on a target object in the radiation range of the detection microwaves to form reflected echoes; a receiving antenna is also provided for receiving the reflected echo. Because the transmitting microwave and the reflected echo exist in the same space at the same time, certain mutual influence problem is necessarily existed, in order to accurately detect the reflected echo, the transmitting microwave and the reflected echo are required to realize certain isolation, certain phase difference, preferably 180 degrees, is required to exist in the phases of the transmitting microwave and the reflected echo, and meanwhile, the amplitude of the reflected echo is required to be high enough. In order to meet the above requirements, the existing design is usually designed in a manner of separating a microwave transmitting antenna and a receiving antenna separately, and a microwave signal generating circuit and an echo mixing circuit are respectively arranged and matched with each other, so that the microwave transmitting antenna and the receiving antenna are physically isolated, the polarization directions are opposite, and the isolation of a transmitted microwave signal and an echo signal is realized, so that a microwave-radiated moving object can be accurately detected. Since there are two antennas, there must also be two feed points according to the microwave doppler working principle.
The prior sensor technology field is developing towards miniaturization and miniaturization, and most of microwave signal generating circuits and microwave mixing circuits can be integrated into an integrated chip to realize circuit miniaturization. Therefore, the biggest bottleneck affecting further miniaturization and miniaturization of the detection module is that the detection module needs to be structurally provided with enough space and structure for placing the transmitting antenna and the receiving antenna, so that the detection module cannot be further reduced in size.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve how realize carrying out the microwave transmitting antenna and echo receiving antenna on the basis of unification sharing, guarantee the effective separation of the microwave signal of transmission and reflection echo signal, guarantee certain isolation moreover, guarantee the size of the echo signal range of reflection simultaneously, through the signal of the sufficient intensity of mixing after-detection output, realize effectual echo detection.
In order to solve the above problem the utility model provides a realize receiving and dispatching microwave detection antenna's circuit, including an integrated chip and a microwave detection antenna, integrated chip includes 1 microwave transmission excitation output foot and 1 echo detection input foot, and its characterized in that microwave transmission and echo receive the sharing the feed point of microwave detection antenna and microwave detection antenna, microwave transmission excitation output foot is connected with microwave detection antenna's feed point through the transmission electric capacity on the route of launching, echo detection input foot is connected with microwave detection antenna's feed point through receiving inductance or receiving resistance on the route of receiving.
The circuit for realizing the receiving and transmitting integrated microwave detection antenna is characterized in that a primary filter inductor or a primary filter resistor for filtering is additionally arranged between the feed point and a reference ground.
The circuit for realizing the receiving and transmitting integrated microwave detection antenna is characterized in that the transmitting capacitor on the transmitting path and the receiving inductor or the receiving resistor on the receiving path are firstly connected with a common connection point, then are connected with a coupling capacitor in series and then are connected with the feeding point, and a secondary filter inductor or a secondary filter resistor for filtering is additionally arranged between the common connection point and a reference ground.
The circuit for realizing the receiving and transmitting integrated microwave detection antenna is characterized in that one end or two ends of the transmitting capacitor are provided with a filter capacitor in a grounding mode, and the microwave transmitting excitation output pin is provided with a power supply resistor or a power supply inductor.
The circuit for realizing the receiving and transmitting integrated microwave detection antenna is characterized in that the receiving inductor is a high-frequency inductor or a micro-strip inductor formed by PCB micro-strip lines.
The circuit for realizing the receiving and transmitting integrated microwave detection antenna is characterized in that the receiving resistor is a low-resistance resistor.
The circuit for realizing the transceiving integrated microwave detection antenna is characterized in that the transmitting capacitor is an equivalent capacitor formed by copper foils at intervals of a PCB.
The circuit for realizing the transceiving integrated microwave detection antenna is characterized in that a radiation source of the microwave detection antenna is a planar patch conductor, the radiation source is symmetrically distributed in the left and right direction and symmetrically distributed in the up and down direction, and the linear polarization direction is perpendicular to a zero potential line; the feed point is arranged on a midline which passes through the physical central point of the radiation source along the linear polarization direction and is arranged in a way of deviating from the physical central point of the radiation source.
The circuit for realizing the transceiving microwave detection antenna is characterized in that the physical central point of the radiation source is set as the grounding point of the radiation source to be connected with the reference ground; or a plurality of radiation source grounding points are arranged on the zero potential line, and the radiation source grounding points are connected with the reference ground.
The circuit for realizing the transceiving microwave detection antenna is characterized in that a primary filter inductor or a primary filter resistor is replaced by an equivalent inductor between a feed point and a radiation source grounding point at the physical central point of a radiation source or a radiation source grounding point on a zero potential line.
A detection module comprises a microwave detection antenna and a matching circuit, and is characterized in that the microwave detection antenna and the matching circuit adopt the circuit for realizing the receiving and transmitting of the microwave detection antenna.
Implement the utility model discloses following beneficial effect has: different characteristics of the capacitor and the inductor are ingeniously utilized to realize that one microwave detection antenna and one feed point are shared, so that the separation of transmitting microwave signals and receiving reflected echo signals can be realized, the phase difference between the transmitted microwave signals and the received reflected echo signals is 180 degrees, and because only one inductor or low-resistance resistor is connected between the feed point and an echo detection input pin, the attenuation of the reflected echo signals is extremely low, and the detection of the reflected echo signals is integrally facilitated. The microwave detection module only needs one microwave detection antenna and one feed point, one microwave detection antenna can be reduced, half of the size of the microwave detection antenna is reduced, and the possibility of miniaturization of the detection module is greatly improved.
Drawings
FIG. 1 is a schematic circuit diagram of a basic implementation of the present invention;
fig. 2 is a schematic diagram of a further optimized implementation circuit of the present invention;
fig. 3 is a schematic diagram of another optimized implementation circuit of the invention;
FIG. 4 is a schematic circuit diagram of another preferred embodiment of the present invention;
fig. 5 is a schematic view of an embodiment of a radiation source of the microwave detecting antenna of the present invention;
FIG. 6 is a schematic diagram of an embodiment of a radiation source of the microwave detecting antenna of the present invention;
fig. 7 is a schematic diagram illustrating the radiation source implementation optimization of the microwave detecting antenna of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model aims to satisfy the overall dimension of surveying the module, realize small-size and miniaturation as far as. The size of the detection module is realized in a system engineering way, and needs to be comprehensively optimized, and the whole optimization is carried out in the aspects of circuits, antennas, structures and the like. For example, in the conventional circuit, a microwave excitation generation circuit, reflected echo detection, signal processing and control, and the like are often realized by adopting separate components, so that the size of the circuit board is also large due to the physical structure limitation of the components. Due to the development of integrated circuit technology, integrated circuit chips capable of realizing microwave emission and reflected echo signal detection are provided, so that the size of the circuit board can be reduced to be extremely small. So that the size of the detection module depends to some extent on the size of the microwave detection antenna. Therefore, how to reduce the size of the microwave detection antenna is a core problem of further reducing the size of the detection module. If the sizes of the transmitting antenna and the receiving antenna of the detection module are simply reduced, the problem can be improved to a certain extent, but the problem that the effective monitoring range and the sensitivity of the detection module are sacrificed inevitably exists, and the size can not be further reduced after the size is reduced to a certain extent.
The utility model discloses broken through conventional design, provided a realize receiving and dispatching unification microwave detection antenna's circuit, can realize the antenna of microwave transmission and echo reception sharing, directly on the basis of two microwave detection antennas now, reduce the size of microwave detection antenna for original half, can directly realize reducing the detection module size that has now for original half and become possible.
FIG. 1 is a schematic circuit diagram of a basic implementation of the present invention; the circuit comprises an integrated chip and a microwave detection antenna T, wherein the integrated chip comprises 1 microwave transmitting and exciting output pin PA/TX and 1 echo detection input pin RFIN/RX, the microwave transmitting and exciting output pin PA/TX is connected with a feed point P1 of the microwave detection antenna through a transmitting capacitor C1 on a transmitting path, and the echo detection input pin RFIN/RX is connected with a feed point P1 of the microwave detection antenna through a receiving inductor or a receiving resistor L1/R1 on a receiving path; the microwave emission excitation output pin PA/TX is also generally connected with a power supply VCC to supply an inductor or a resistor L2/R2. A path is arranged between the feed point P1 and the transmitting output pin PA/TX, the reason that the capacitor is selected is that microwave transmitting current excitation is carried out on the antenna while direct current is isolated, the internal mixing circuit of the integrated chip takes a reference ground GND as a potential reference point, and after an excitation signal output by the transmitting output pin PA/TX passes through a transmitting capacitor C1, the current phase leads 90 degrees, namely the voltage phase lags behind the current phase by 90 degrees; the transmitted microwave electromagnetic wave is reflected after encountering a detection object, and the reflected echo passes through the same microwave detection antenna and is connected to an echo detection input pin RFIN/RX through a receiving inductor or a receiving resistor L1/R1, wherein the receiving inductor is preferably adopted; the received reflected echo presents a voltage signal at the antenna feed point P1, and after passing through an inductor, the formed current signal lags the voltage signal by 90 degrees, so that the phase of the port voltage finally input to the echo detection input pin RFIN/RX lags 180 degrees with respect to the echo signal and the transmission signal of the reference ground GND, that is, the purpose of effectively separating the microwave transmission signal and the microwave reflected echo signal is ensured, meanwhile, because only an inductor or a low-resistance resistor is connected between the feed point P1 and the echo detection input pin RFIN/RX, the reflected echo signal received by the microwave detection antenna can be input to the echo detection input pin RFIN/RX with basically no loss or extremely small loss, and the strength of the input reflected echo signal can be effectively ensured. Because the single microwave detection antenna and the single feed point are adopted, the path for receiving and transmitting signals is short, and the loss of microwave transmitting signals and the loss of receiving signals in the circuit are reduced.
The reason that the phase is adjusted by selecting a capacitor between the microwave transmitting excitation output pin PA/TX and the feeding point P1 of the microwave detection antenna instead of selecting an inductor is that the microwave transmitting excitation work is current work, the loss of the capacitor to the current is smaller, and if the inductor is selected, the excitation signal of the transmitting signal has certain loss, which is not beneficial to the work of a transmitting path. Theoretically, the phase difference between the transmitted microwave signal and the received reflected echo signal is 90 degrees to 180 degrees, so that the transmitted microwave signal and the received reflected echo signal can be separated, but the phase difference is preferably 180 degrees. Thus, as a preferred inductance between the feed point P1 and the echo detection input pin RFIN/RX, a low resistance is connected between the feed point P1 and the echo detection input pin RFIN/RX.
Because the microwave transmitting path and the echo receiving path are both high-frequency working circuits which are easy to be interfered, different filter circuits can be added on different paths, and the anti-interference capability of the whole circuit is improved. Fig. 2 is a schematic diagram of a further optimized implementation circuit of the present invention; fig. 3 is a schematic diagram of another optimized implementation circuit of the invention; FIG. 4 is a schematic circuit diagram of another preferred embodiment of the present invention; all for improving the anti-interference capability of the circuit.
A primary filter inductor or a primary filter resistor L11/R11 for filtering can be additionally arranged between the feed point and the reference ground.
The transmitting capacitor on the transmitting path and the receiving inductor or the receiving resistor on the receiving path are firstly connected with a common connection point, then are connected with a coupling capacitor C2 in series and then are connected with the feeding point, and a secondary filter inductor or a secondary filter resistor L12/R12 for filtering is additionally arranged between the common connection point and a reference ground.
A filter capacitor C3 can be added to one or two ends of the transmitting capacitor.
In order to further simplify the circuit, the receiving inductor may be a microstrip inductor formed by a PCB microstrip line; the transmitting capacitor is an equivalent capacitor formed by copper foils at intervals of the PCB.
Fig. 5 is the utility model discloses a schematic diagram is implemented to microwave detection antenna's radiation source, and microwave detection antenna's radiation source can be plane paster conductor, and microwave detection antenna's radiation source bilateral symmetry distributes and/or upper and lower symmetric distribution, according to the detection range of final needs, designs different polarization directions. In this embodiment, a left-right symmetric distribution and a top-bottom symmetric distribution of radiation sources of a microwave detection antenna are taken as an example for explanation, and a linear polarization direction Y _ lin of the microwave detection antenna is perpendicular to a zero potential line X _ lin; the radiation source of the microwave detection antenna may be rectangular, circular or elliptical in its entirety, or other patterns that are adjusted according to the detection range. The feeding point is arranged on a midline along the linear polarization direction Y _ lin and passing through the physical center point of the radiation source, with a spacing from the physical center point PP of the radiation source, which is practically equivalent to an inductance between the feeding point and ground due to the distance between the feeding point P1 and the zero potential line X _ lin. The zero potential line is a line which is on the plane antenna, is vertical to the polarization direction and passes through the grounding point of the radiation source, and can also be called as an energy balance line.
The grounding point of the radiation source on the zero potential line can have one point or a plurality of points, fig. 6 is a schematic diagram of the radiation source implementation improvement of the microwave detection antenna of the present invention, and the embodiment preferably selects the grounding point of the radiation source as the physical central point of the radiation source as the grounding point of the radiation source; fig. 7 is the radiation source implementation optimization schematic diagram of the microwave detecting antenna of the present invention, and it is also possible to select two points on a line perpendicular to the linear polarization direction Y _ lin as radiation source grounding points P11 and P12, and the lines passing through the radiation source grounding points P11 and P12 are zero potential lines X _ lin, and preferably the zero potential lines X _ lin pass through the physical center point PP of the radiation source.
The above disclosure is only an embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereto, and all or part of the process of implementing the above embodiment may be understood by those skilled in the art, and the equivalent changes made in the claims of the present invention may still fall within the scope covered by the present invention.
Claims (11)
1. The utility model provides a circuit of microwave detection antenna is unified in realization receiving and dispatching, includes an integrated chip and a microwave detection antenna, integrated chip includes 1 microwave transmission excitation output pin and 1 echo detection input pin, its characterized in that microwave transmission and echo reception sharing the feed point of microwave detection antenna and microwave detection antenna, microwave transmission excitation output pin is connected with the feed point of microwave detection antenna through transmitting capacitance on the route of launching, echo detection input pin is connected with the feed point of microwave detection antenna through receiving inductance or receiving resistance on the route of receiving.
2. The circuit for implementing a transmitting/receiving microwave detecting antenna as claimed in claim 1, wherein a first filtering inductor or a first filtering resistor for filtering is added between the feeding point and a reference ground.
3. The circuit for implementing a microwave detecting antenna according to claim 2, wherein the transmitting capacitor of the transmitting path and the receiving inductor or the receiving resistor of the receiving path are connected to a common node, and then connected to a coupling capacitor in series and then connected to the feeding node, and a secondary filter inductor or a secondary filter resistor for filtering is further added between the common node and a reference ground.
4. A circuit for realizing transceiving a microwave detecting antenna according to claim 2 or 3, wherein one or both ends of the transmitting capacitor are grounded and provided with a filter capacitor, and the microwave transmitting excitation output pin is provided with a power supply resistor or a power supply inductor.
5. The circuit for implementing a transmitting-receiving microwave detecting antenna as claimed in claim 1, wherein the receiving inductor is a high frequency inductor or a microstrip inductor formed by PCB microstrip lines.
6. The circuit for implementing a transmitting/receiving microwave detecting antenna as claimed in claim 1, wherein said receiving resistor is a low resistance resistor.
7. The circuit for implementing a transceiving microwave detecting antenna according to claim 1, wherein said transmitting capacitor is an equivalent capacitor formed by spaced copper foils of the PCB.
8. The circuit for implementing a transmitting-receiving integrated microwave detecting antenna according to claim 1, wherein the radiation source of the microwave detecting antenna is a planar patch conductor, the radiation source is symmetrically distributed left and right and symmetrically distributed up and down, and the linear polarization direction is perpendicular to the zero potential line; the feed point is arranged on a midline which passes through the physical central point of the radiation source along the linear polarization direction and is arranged in a way of deviating from the physical central point of the radiation source.
9. The circuit for implementing a transmitting-receiving microwave detecting antenna as claimed in claim 8, wherein the physical center point of the radiation source is set to connect the radiation source ground point with the reference ground; or a plurality of radiation source grounding points are arranged on the zero potential line, and the radiation source grounding points are connected with the reference ground.
10. The circuit for implementing a transmitting-receiving microwave detecting antenna as claimed in claim 9, wherein the primary filter inductor or the primary filter resistor is replaced by an equivalent inductor between the feeding point and the radiation source grounding point at the physical center point of the radiation source or the radiation source grounding point on the zero potential line.
11. A detection module comprising a microwave detection antenna and a matching circuit, wherein the microwave detection antenna and the matching circuit adopt the circuit for realizing the transceiving of a microwave detection antenna according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021698927.4U CN213041986U (en) | 2020-08-14 | 2020-08-14 | Circuit for realizing transmitting-receiving integrated microwave detection antenna and detection module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021698927.4U CN213041986U (en) | 2020-08-14 | 2020-08-14 | Circuit for realizing transmitting-receiving integrated microwave detection antenna and detection module |
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| Publication Number | Publication Date |
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| CN213041986U true CN213041986U (en) | 2021-04-23 |
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| CN202021698927.4U Active CN213041986U (en) | 2020-08-14 | 2020-08-14 | Circuit for realizing transmitting-receiving integrated microwave detection antenna and detection module |
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