Near-field antenna of Internet of Things

Abstract

The utility model discloses an Internet of Things near-field antenna, which belongs to the technical field of antennas and comprises a substrate, a feed point P1, an etching patch oscillator layer and a feed point network layer. The feed point P1, the feed point network layer and the etching patch oscillator layer are all arranged on the upper surface of the substrate, and the feed point P1 is electrically connected with the etching patch oscillator layer through the feed point network layer; the etching patch oscillator layer comprises four groups of oscillator sub-arrays, each group of oscillator sub-arrays comprises a plurality of oscillators, two groups of oscillator sub-arrays positioned on the same side form an array, and the phase difference of two groups of arrays is 180 degrees; and the oscillator sub-arrays are uniformly distributed on the upper surface of the substrate. According to the near-field antenna of the Internet of Things, the problem that signal transmission is unstable due to the fact that signals in some places of an existing near-field antenna are strong and signals in some places are weak is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, and in particular to an Internet of Things near-field antenna. Background Art

[0002] In recent years, with the development of RFID (radio frequency identification) technology, it has been widely used in the fields of book management in libraries and jewelry management in jewelry stores. As an important part of the RFID system, the reader antenna plays a very important role. In the RFID system, the reader antenna is divided into two types: far-field antenna and near-field antenna. The far-field antenna is generally used for long-distance inventory, and the recognition distance is relatively long, generally from a few meters to more than ten meters, or even more than thirty meters. The near-field antenna is mainly used for close-range reading and writing of tags, generally within one meter, for tag issuance and close-range inventory. Since the near-field antenna has a short recognition distance and the energy is more concentrated under the same transmission power, it has a better inventory effect within a certain range.

[0003] However, existing near-field antennas have difficulty maintaining stability at every point on the antenna surface within a specified operating frequency band, which results in strong signals in some places and weak signals in other places, leading to unstable signal transmission. Utility Model Content

[0004] In order to overcome the defects of the prior art, the utility model provides an Internet of Things near-field antenna to solve the above-mentioned problems.

[0005] The technical solution adopted by the utility model to solve the technical problem is: an Internet of Things near-field antenna, including a substrate, a feed point P1, an etched patch oscillator layer and a feed point network layer;

[0006] The feed point P1, the feed point network layer and the etched patch oscillator layer are all arranged on the upper surface of the substrate, and the feed point P1 is electrically connected to the etched patch oscillator layer through the feed point network layer;

[0007] The etched patch vibrator layer includes four groups of vibrator subarrays, each group of vibrator subarrays includes multiple vibrators, and two groups of vibrator subarrays located on the same side form an array, wherein the phase difference between the two groups of arrays is 180°; the vibrator subarrays are evenly distributed on the upper surface of the substrate.

[0008] Preferably, the Internet of Things near-field antenna also includes a reflective metal layer and an EVA cotton layer, the reflective metal layer is arranged on the lower surface of the substrate, and the EVA cotton layer is arranged on the upper surface of the etched patch vibrator layer.

[0009] Optionally, the vibrator is a right-hand circularly polarized vibrator.

[0010] Specifically, the oscillator subarray includes 4 oscillators; the feed point network layer includes one-to-two channels E1, one-to-two channels E2, one-to-two channels E11, one-to-two channels E12, one-to-two channels E21, one-to-two channels E22, one-to-two channels E111, one-to-two channels E112, one-to-two channels E121, one-to-two channels E122, one-to-two channels E211, one-to-two channels E221 and one-to-two channels E222;

[0011] The feed point P1 is electrically connected to the input end of the one-to-two channel E1 and the input end of the one-to-two channel E2 respectively;

[0012] The two output ends of the one-to-two channel E1 are electrically connected to the input ends of the one-to-two channel E11 and the input ends of the one-to-two channel E12, respectively; the two output ends of the one-to-two channel E11 are electrically connected to the input ends of the one-to-two channel E111 and the input ends of the one-to-two channel E112, respectively; the two output ends of the one-to-two channel E12 are electrically connected to the input ends of the one-to-two channel E121 and the input ends of the one-to-two channel E122, respectively;

[0013] The two output ends of the one-to-two channel E2 are electrically connected to the input ends of the one-to-two channel E21 and the input ends of the one-to-two channel E22, respectively; the two output ends of the one-to-two channel E21 are electrically connected to the input ends of the one-to-two channel E211 and the input ends of the one-to-two channel E212, respectively; the two output ends of the one-to-two channel E22 are electrically connected to the input ends of the one-to-two channel E221 and the input ends of the one-to-two channel E222, respectively;

[0014] The two output ends of the one-divided-to-two channel E111, the two output ends of the one-divided-to-two channel E112, the two output ends of the one-divided-to-two channel E121, the two output ends of the one-divided-to-two channel E122, the two output ends of the one-divided-to-two channel E211, the two output ends of the one-divided-to-two channel E221 and the two output ends of the one-divided-to-two channel E222 all form corresponding terminal networks, and the terminal networks are electrically connected to the corresponding oscillators.

[0015] It is worth noting that, in each group of vibrator sub-arrays, the size of one vibrator is different from the sizes of the other three vibrators.

[0016] Specifically, the oscillator subarray includes three oscillators; the feed point network layer includes a one-to-two channel F1, a one-to-two channel F2, a one-to-three channel F11, a one-to-three channel F12, a one-to-three channel F21 and a one-to-three channel F22;

[0017] The feed point P1 is electrically connected to the input end of the one-to-two channel F1 and the input end of the one-to-two channel F2 respectively;

[0018] The two output ends of the one-to-two channel F1 are electrically connected to the input end of the one-to-three channel F11 and the input end of the one-to-three channel F12 respectively;

[0019] The two output ends of the one-to-two channel F2 are electrically connected to the input end of the one-to-three channel F21 and the input end of the one-to-three channel F22 respectively;

[0020] The three output ends of the one-to-three channel F11, the three output ends of the one-to-three channel F12, the two output ends of the one-to-three channel F21 and the two output ends of the one-to-three channel F22 all form corresponding terminal networks, which are electrically connected to corresponding oscillators.

[0021] Optionally, in each array group, signal conditioners are provided on opposite sides of one of the oscillators.

[0022] The beneficial effect of the utility model is that in the IoT near-field antenna, vibrators are used to form vibrator subarrays, which are then formed into arrays. The phase difference between the two arrays is 180 degrees, so that the signals of the two arrays form an M-shaped signal area above the antenna. The advantage of such an array is that the signal amount is dispersed, the signal is averaged, the indicators are stable within the working frequency band, and stable signal transmission is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 An exploded view of an IoT near-field antenna in one embodiment of the utility model;

[0024] Figure 2 It is a schematic diagram of the structure of an etched patch vibrator layer composed of 16 vibrators in one embodiment of the utility model;

[0025] Figure 3 It is a schematic diagram of the structure of a feed point network layer composed of 16 vibrators in one embodiment of the utility model;

[0026] Figure 4 It is a schematic diagram of the structure of an etched patch vibrator layer composed of 12 vibrators in one embodiment of the utility model;

[0027] Figure 5 It is a structural schematic diagram of a feed point network layer composed of 12 vibrators in one embodiment of the utility model;

[0028] Figure 6 This is a schematic diagram of the radiation direction of the vibrator in one embodiment of the utility model;

[0029] In the figure: 1 substrate; 2 etched patch oscillator layer; 3 feed point network layer; 4 reflective metal layer; 5 EVA cotton layer. DETAILED DESCRIPTION

[0030] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] like Figure 1-6 As shown, an IoT near-field antenna includes a substrate 1, a feed point P1, an etched patch oscillator layer 2 and a feed point network layer 3;

[0032] The feed point P1, the feed point network layer 3 and the etched patch oscillator layer 2 are all arranged on the upper surface of the substrate 1, and the feed point P1 is electrically connected to the etched patch oscillator layer 2 through the feed point network layer 3;

[0033] The etched patch vibrator layer 2 includes four groups of vibrator subarrays, each group of vibrator subarrays includes multiple vibrators, and two groups of vibrator subarrays located on the same side form an array, wherein the phase difference between the two groups of arrays is 180°; the vibrator subarrays are evenly distributed on the upper surface of the substrate 1.

[0034] In the IoT near-field antenna, vibrators are used to form vibrator subarrays, which are then formed into arrays. The phase difference between the two arrays is 180 degrees, so that the signals of the two arrays form an M-shaped signal area above the antenna. The advantage of this array is that the signal amount is dispersed, the signal is averaged, the indicators are stable within the working frequency band of 902MHz to 928MHz, and stable signal transmission is achieved.

[0035] It is worth noting that the IoT near-field antenna also includes a reflective metal layer 4 and an EVA cotton layer 5, wherein the reflective metal layer 4 is arranged on the lower surface of the substrate 1, and the EVA cotton layer 5 is arranged on the upper surface of the etched patch vibrator layer 2. The substrate 1 is composed of double-sided metal copper platinum clad copper, and a reflective metal layer 4 is arranged on its lower surface as a reflector, and a microstrip line is engraved on its upper surface to form a feed point network layer 3, and an etched patch vibrator layer 2 is arranged, and an EVA cotton layer 5 is bonded above the etched patch vibrator layer 2 for protection.

[0036] Specifically, the vibrator is a right-hand circularly polarized vibrator.

[0037] Preferably, Figure 2 and 3As shown, the dipole subarray includes 4 dipoles; the feed point network layer 3 includes one-to-two channels E1, one-to-two channels E2, one-to-two channels E11, one-to-two channels E12, one-to-two channels E21, one-to-two channels E22, one-to-two channels E111, one-to-two channels E112, one-to-two channels E121, one-to-two channels E122, one-to-two channels E211, one-to-two channels E221 and one-to-two channels E222;

[0038] The feed point P1 is electrically connected to the input end of the one-to-two channel E1 and the input end of the one-to-two channel E2 respectively; the two output ends of the one-to-two channel E1 are electrically connected to the input end of the one-to-two channel E11 and the input end of the one-to-two channel E12 respectively, the two output ends of the one-to-two channel E11 are electrically connected to the input end of the one-to-two channel E111 and the input end of the one-to-two channel E112 respectively, the two output ends of the one-to-two channel E12 are electrically connected to the input end of the one-to-two channel E121 and the input end of the one-to-two channel E122 respectively; the two output ends of the one-to-two channel E2 are electrically connected to the input end of the one-to-two channel E21 and the input end of the one-to-two channel E22 respectively, the one-to-two channel E21 is electrically connected to the input end of the one-to-two channel E22 The two output ends of the two-channel E21 are electrically connected to the input ends of the one-divided-to-two channel E211 and the input ends of the one-divided-to-two channel E212, respectively; the two output ends of the one-divided-to-two channel E22 are electrically connected to the input ends of the one-divided-to-two channel E221 and the input ends of the one-divided-to-two channel E222, respectively; the two output ends of the one-divided-to-two channel E111, the two output ends of the one-divided-to-two channel E112, the two output ends of the one-divided-to-two channel E121, the two output ends of the one-divided-to-two channel E122, the two output ends of the one-divided-to-two channel E211, the two output ends of the one-divided-to-two channel E221 and the two output ends of the one-divided-to-two channel E222 all form corresponding terminal networks, which are electrically connected to corresponding oscillators.

[0039] The IoT near-field antenna is composed of an array of 16 right-hand circularly polarized oscillators. The etched patch oscillator layer 2 composed of 16 right-hand circularly polarized oscillators includes array A1 and array A2. Array A1 and array A2 each consist of 8 oscillators. Array A1 includes subarray A1a and subarray A1b. Subarray A1a and subarray A1b are in phase. Array A2 includes subarray A2a and subarray A2b. Subarray A2a and subarray A2b are in phase. The phase difference between array A1 and array A2 is 180 degrees. Figure 6 As shown, the signals of the two arrays form an M-shaped signal area above the antenna. The advantage of this array is that the signal is dispersed, making it easy to read tags on both sides of the antenna.

[0040] The signal is transmitted from the feed point P1 to the feed point network layer 3. The feed point network layer 3 is composed of a four-in-one equally divided feeding network. In this embodiment, only one of them is taken to illustrate its working principle: the signal passing through the feed point P1 passes through the one-to-two channel E1 and the one-to-two channel E2. The one-to-two channel E1 adjusts the signal impedance to 25 ohms through the matching impedance E1A and then feeds them to the input ends of the one-to-two channel E11 and the one-to-two channel E12 respectively. The one-to-two channel E11 distributes the signal evenly to the input ends of the one-to-two channel E111 and the one-to-two channel E112 through the matching impedance E11A. Then, the two output ends of the one-to-two channel E111 form the terminal network E111a and the terminal network E111b, and then transmit them to the oscillator A11 and the oscillator A14 respectively through the terminal network E111a and the terminal network E111b. In this embodiment, the two output ends of the one-to-two channel E111 are electrically connected to the vibrator A11 and the vibrator A14 respectively, the two output ends of the one-to-two channel E112 are electrically connected to the vibrator A12 and the vibrator A13 respectively, the two output ends of the one-to-two channel E121 are electrically connected to the vibrator A15 and the vibrator A18 respectively, the two output ends of the one-to-two channel E122 are electrically connected to the vibrator A16 and the vibrator A17 respectively, the two output ends of the one-to-two channel E211 are electrically connected to the vibrator A21 and the vibrator A24 respectively, the two output ends of the one-to-two channel E212 are electrically connected to the vibrator A22 and the vibrator A23 respectively, the two output ends of the one-to-two channel E221 are electrically connected to the vibrator A25 and the vibrator A28 respectively, and the two output ends of the one-to-two channel E222 are electrically connected to the vibrator A26 and the vibrator A27 respectively.

[0041] Among them, subarray A1a and subarray A1b, due to the consistent phase, together form an array A1 composed of 8 oscillator units. Since the phase difference between array A1 and array A2 is 180 degrees, they form two main braid arrays. The wavelength of this antenna oscillator in FR4 medium is 0.33, and the size is about 78.5MM. The arrangement size is 132MM vertical spacing and 97 column spacing. Reasonable calculation of the oscillator size and arrangement distribution makes the average signal strength of the antenna surface signal large and the tag recognition ability strong.

[0042] Optionally, in each group of vibrator sub-arrays, the size of one vibrator is different from the sizes of the other three vibrators, so that the vibrators with sizes different from the other three form a signal quantity regulator. In this embodiment, the size is the length and width of the vibrator. Different sizes mean that the length and width of the vibrator are different, and the same size means that the length and width of the vibrator are the same. Specifically, the sizes of the remaining four vibrators are the same. The signal of a conventional array antenna is usually at the center of the antenna, and the recognition of labels on both sides of the antenna is relatively poor. Since the signal of the antenna is relatively dispersed, the echo interference of the antenna is smaller than that of the conventional array antenna. Since the antenna is a circularly polarized antenna, the signal amount of each axis of each vibrator will have a small difference. In order to correct the signal amount difference, a vibrator of different sizes is set in each subarray as a signal amount regulator (vibrator A11, vibrator A12, vibrator A13 and vibrator A14 in this embodiment are used as signal amount regulators).

[0043] It is worth noting that if Figure 4 and 5 As shown, the dipole subarray includes three dipoles; the feed point network layer 3 includes a one-to-two channel F1, a one-to-two channel F2, a one-to-three channel F11, a one-to-three channel F12, a one-to-three channel F21 and a one-to-three channel F22;

[0044] The feed point P1 is electrically connected to the input end of the one-to-two channel F1 and the input end of the one-to-two channel F2, respectively; the two output ends of the one-to-two channel F1 are electrically connected to the input end of the one-to-three channel F11 and the input end of the one-to-three channel F12, respectively; the two output ends of the one-to-two channel F2 are electrically connected to the input end of the one-to-three channel F21 and the input end of the one-to-three channel F22, respectively; the three output ends of the one-to-three channel F11, the three output ends of the one-to-three channel F12, the two output ends of the one-to-three channel F21 and the two output ends of the one-to-three channel F22 all form corresponding terminal networks, and the terminal networks are electrically connected to corresponding oscillators.

[0045] The IoT near-field antenna is composed of an array of 12 right-hand circularly polarized oscillators. The etched patch oscillator layer 2 composed of 12 right-hand circularly polarized oscillators includes array B1 and array B2. Array B1 and array B2 each consist of 6 oscillators. Array B1 includes subarray B11 and subarray B12. Subarray B11 and subarray B12 are in phase. Array B2 includes subarray B21 and subarray B22. Subarray B21 and subarray B22 are in phase. The phase difference between array B1 and array B1 is 180 degrees, so that the signals of the two arrays form an m-shaped signal area above the antenna. The advantage of this array is that the signal is dispersed, and it is easy to read the tags on both sides of the antenna.

[0046] The signal is transmitted from the feed point P1 to the feed point network layer 3. The feed point network layer 3 is composed of a four-in-one feeding network divided equally. In this embodiment, only one of them is taken to illustrate its working principle: the signal passing through the feed point P1 passes through the one-to-two channel F1 and the one-to-two channel F2. The one-to-two channel F1 adjusts the signal impedance to 25 ohms through the matching impedance F1A and feeds them to the input ends of the one-to-two channel F11 and the input ends of the one-to-two channel F12 respectively. The one-to-two channel F11 distributes the signal evenly to the terminal network E111, the terminal network E112 and the terminal network E113 through the matching impedance F11A, and transmits it to the vibrators B111, the vibrators B112 and the vibrators B113 respectively. In this embodiment, the three output ends of the one-to-three channel F11 are electrically connected to the vibrator B111, the vibrator B112 and the vibrator B113, respectively; the three output ends of the one-to-three channel F12 are electrically connected to the vibrator B114, the vibrator B115 and the vibrator B116, respectively; the three output ends of the one-to-three channel F21 are electrically connected to the vibrator B211, the vibrator B212 and the vibrator B213, respectively; the three output ends of the one-to-three channel F22 are electrically connected to the vibrator B214, the vibrator B215 and the vibrator B216, respectively.

[0047] Among them, subarray B11 and subarray B12, due to the consistent phase, together form an array B1 composed of 6 oscillator units. Since the phase difference between array B1 and array B2 is 180 degrees, they form two main braid arrays. The wavelength of this antenna oscillator in FR4 medium is 0.33, and the size is about 78.5MM. The arrangement size is 132MM vertical spacing and 97 column spacing. Reasonable calculation of the oscillator size and arrangement distribution makes the average signal strength of the antenna surface signal large and the tag recognition ability strong. Finally, an array of 12 right-hand circularly polarized oscillators is formed.

[0048] Preferably, in each array, a signal regulator is provided on opposite sides of one of the oscillators. The signal of a conventional array antenna is usually at the center of the antenna, and the recognition of labels on both sides of the antenna is relatively poor. Since the signal of the antenna is relatively dispersed, the antenna has less echo interference than the antenna of a conventional array. Since the antenna is a circularly polarized antenna, there will be a slight difference in the signal amount of each axis of each oscillator. In order to correct the difference in signal amount, a pair of oscillator signal regulators are added to the oscillator B113 of array B1 and the oscillator B213 in array B2, wherein the oscillator B113 is provided with oscillator signal regulators B01 and B02, and the oscillator B213 is provided with oscillator signal regulators B03 and B04. The functions of B01 and B02 are mainly to control the radiation amount of the subarray A1 on the X-axis and average the distribution of the field strength of the entire antenna surface. The same applies to B03 and B04.

[0049] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. An IoT near-field antenna, characterized in that: It includes a substrate, a feeding point P1, an etched patch vibrator layer and a feeding point network layer; The feed point P1, the feed point network layer and the etched patch oscillator layer are all arranged on the upper surface of the substrate, and the feed point P1 is electrically connected to the etched patch oscillator layer through the feed point network layer; The etched patch vibrator layer includes four groups of vibrator subarrays, each group of vibrator subarrays includes multiple vibrators, and two groups of vibrator subarrays located on the same side form an array, wherein the phase difference between the two groups of arrays is 180°; the vibrator subarrays are evenly distributed on the upper surface of the substrate.

2. The IoT near-field antenna according to claim 1, characterized in that: The Internet of Things near-field antenna also includes a reflective metal layer and an EVA cotton layer. The reflective metal layer is arranged on the lower surface of the substrate, and the EVA cotton layer is arranged on the upper surface of the etched patch vibrator layer.

3. The IoT near-field antenna according to claim 1, characterized in that: The vibrator is a right-hand circularly polarized vibrator.

4. The IoT near-field antenna according to claim 1, characterized in that: The oscillator subarray includes 4 oscillators; the feed point network layer includes one-to-two channels E1, one-to-two channels E2, one-to-two channels E11, one-to-two channels E12, one-to-two channels E21, one-to-two channels E22, one-to-two channels E111, one-to-two channels E112, one-to-two channels E121, one-to-two channels E122, one-to-two channels E211, one-to-two channels E221 and one-to-two channels E222; The feed point P1 is electrically connected to the input end of the one-to-two channel E1 and the input end of the one-to-two channel E2 respectively; The two output ends of the one-to-two channel E1 are electrically connected to the input ends of the one-to-two channel E11 and the input ends of the one-to-two channel E12, respectively; the two output ends of the one-to-two channel E11 are electrically connected to the input ends of the one-to-two channel E111 and the input ends of the one-to-two channel E112, respectively; the two output ends of the one-to-two channel E12 are electrically connected to the input ends of the one-to-two channel E121 and the input ends of the one-to-two channel E122, respectively; The two output ends of the one-to-two channel E2 are electrically connected to the input ends of the one-to-two channel E21 and the input ends of the one-to-two channel E22, respectively; the two output ends of the one-to-two channel E21 are electrically connected to the input ends of the one-to-two channel E211 and the input ends of the one-to-two channel E212, respectively; the two output ends of the one-to-two channel E22 are electrically connected to the input ends of the one-to-two channel E221 and the input ends of the one-to-two channel E222, respectively; The two output ends of the one-divided-to-two channel E111, the two output ends of the one-divided-to-two channel E112, the two output ends of the one-divided-to-two channel E121, the two output ends of the one-divided-to-two channel E122, the two output ends of the one-divided-to-two channel E211, the two output ends of the one-divided-to-two channel E221 and the two output ends of the one-divided-to-two channel E222 all form corresponding terminal networks, and the terminal networks are electrically connected to the corresponding oscillators.

5. The IoT near-field antenna according to claim 4, characterized in that: In each group of the dipole sub-arrays, the size of one of the dipoles is different from the sizes of the other three dipoles.

6. The IoT near-field antenna according to claim 1, characterized in that: The oscillator subarray includes three oscillators; the feed point network layer includes a one-to-two channel F1, a one-to-two channel F2, a one-to-three channel F11, a one-to-three channel F12, a one-to-three channel F21 and a one-to-three channel F22; The feed point P1 is electrically connected to the input end of the one-to-two channel F1 and the input end of the one-to-two channel F2 respectively; The two output ends of the one-to-two channel F1 are electrically connected to the input end of the one-to-three channel F11 and the input end of the one-to-three channel F12 respectively; The two output ends of the one-to-two channel F2 are electrically connected to the input end of the one-to-three channel F21 and the input end of the one-to-three channel F22 respectively; The three output ends of the one-to-three channel F11, the three output ends of the one-to-three channel F12, the two output ends of the one-to-three channel F21 and the two output ends of the one-to-three channel F22 all form corresponding terminal networks, which are electrically connected to corresponding oscillators.

7. The IoT near-field antenna according to claim 6, characterized in that: In each array, signal conditioners are provided on opposite sides of one of the oscillators.

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