Interference-resistant personal digital assistant

Abstract

This application provides an interference-resistant personal digital assistant (PDA), relating to the field of radio frequency identification (RFID) technology. The interference-resistant PDA includes an RFID tag disposed within the PDA. An adhesive layer is disposed on the RFID tag within the PDA, and a wave-absorbing material is attached to the RFID tag through the adhesive layer. Thus, after the PDA's B13 transmission signal is transmitted through the PDA's main antenna, the wave-absorbing material absorbs the second harmonic signal generated after the B13 transmission signal is absorbed by the RFID tag. This prevents the second harmonic signal from interfering with the GPS antenna, thereby improving the sensitivity of the PDA's GPS antenna. Furthermore, the interference-resistant PDA also has the advantages of low cost and simplicity.

Description

Technical Field

[0001] This application relates to the field of radio frequency identification technology, and more particularly to an interference-resistant personal digital assistant. Background Technology

[0002] Radio frequency identification (RFID) tags are a type of contactless automatic identification technology that uses radio signals to identify and exchange data on target objects. They are widely used in asset management, logistics tracking, retail, and healthcare. Therefore, to facilitate asset management, RFID tags are often embedded in personal digital assistants (PDAs).

[0003] Currently, when a PDA supports the B13 band and needs to implement GPS functionality, a main antenna and a GPS antenna need to be installed on the PDA to enable communication between the Long Term Evolution (LTE) transmitter circuit and the GPS receiver link. However, RFID tags can affect the operation of the GPS antenna, causing severe interference. Utility Model Content

[0004] This application provides an anti-interference personal digital assistant that can avoid affecting the operation of the GPS antenna and improve the sensitivity of the GPS antenna.

[0005] In a first aspect, this application provides an anti-interference personal digital assistant, the personal digital assistant including: a radio frequency identification tag disposed inside the personal digital assistant, an adhesive layer disposed on the radio frequency identification tag, and a wave-absorbing material attached to the radio frequency identification tag through the adhesive layer;

[0006] After the B13 transmission signal of the personal digital assistant is transmitted through the main antenna of the personal digital assistant, the second harmonic signal is absorbed by the absorbing material to improve the sensitivity of the GPS antenna of the personal digital assistant. The second harmonic signal is generated by the radio frequency identification tag after absorbing the B13 transmission signal.

[0007] The interference-resistant personal digital assistant (PDA) provided in the first aspect involves placing an adhesive layer on a RFID tag located inside the PDA, and attaching absorbing material to the RFID tag through the adhesive layer. Thus, after the PDA's B13 transmission signal is transmitted through the PDA's main antenna, the absorbing material absorbs the second harmonic signal generated after the RFID tag absorbs the B13 transmission signal. This prevents the second harmonic signal from interfering with the GPS antenna, thereby improving the sensitivity of the PDA's GPS antenna. Furthermore, the interference-resistant PDA also has the advantages of low cost and simplicity.

[0008] In one possible design, the frequency of the absorbing material is between 1554MHz and 1574MHz.

[0009] In one possible design, the magnetic permeability of the absorbing material is greater than 100.

[0010] In one possible design, the center point of the RFID tag coincides with the center point of the absorbing material.

[0011] In one possible design, the length of the absorbing material is greater than the length of the RFID tag, and the width of the absorbing material is greater than the width of the RFID tag.

[0012] In one possible design, the length difference between the length of the absorbing material and the length of the RFID tag is between 0.2 mm and 1.2 mm.

[0013] In one possible design, the width difference between the width of the absorbing material and the width of the RFID tag is between 0.2 mm and 1.2 mm.

[0014] In one possible design, the microwave absorbing material is any one of ferrite microwave absorbing material, carbonyl iron powder microwave absorbing material, and nano microwave absorbing material.

[0015] In one possible design, the adhesive layer is any one of acrylic pressure-sensitive adhesive, epoxy resin adhesive, double-sided adhesive, and polyurethane adhesive.

[0016] In one possible design, the thickness of the adhesive layer is between 0.1 and 0.5 mm.

[0017] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram illustrating the operation of a personal digital assistant in related technologies;

[0020] Figure 2 A schematic diagram of an anti-interference personal digital assistant provided in an embodiment of this application;

[0021] Figure 3 A planar schematic diagram of the application provided for an anti-interference personal digital assistant with wave-absorbing material attachment;

[0022] Figure 4 Another planar schematic diagram of the attachment of a wave-absorbing material in an anti-interference personal digital assistant provided in an embodiment of this application;

[0023] Figure 5 This is another planar schematic diagram of the application of an anti-interference personal digital assistant with wave-absorbing material attached.

[0024] Figure 6 This is another planar schematic diagram of the application of an anti-interference personal digital assistant with wave-absorbing material attached.

[0025] Figure 7 This is another planar schematic diagram of the application of an anti-interference personal digital assistant with wave-absorbing material attached.

[0026] Figure 8 This is another planar schematic diagram of an anti-interference personal digital assistant with wave-absorbing material attached, as provided in an embodiment of this application. Detailed Implementation

[0027] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c alone can mean: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] The terms “center,” “longitudinal,” “lateral,” “up,” “down,” “left,” “right,” “front,” and “rear,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] The terms "connected" and "connected" should be interpreted broadly. For example, in circuit structures, "connected" or "connected" can refer not only to physical connections but also to electrical or signal connections. This could be a direct connection (physical connection) or an indirect connection via at least one intermediate component, as long as the circuit is connected. It could also refer to the internal connection between two components. Similarly, a signal connection can refer to a connection via a circuit or a medium, such as radio waves. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.

[0030] Reference Figure 1 , Figure 1 This is a schematic diagram illustrating the operation of a personal digital assistant in related technologies. For example... Figure 1 As shown, when the PDA operates in the B13 band of LTE, the B13 transmission signal, after being transmitted through the main antenna, has some energy absorbed by the RFID tag. Consequently, the RFID tag generates a second harmonic signal, which, through radiation from the RFID tag, is received by the PDA's GPS antenna. Since the frequency of the second harmonic signal is close to the operating frequency of the GPS antenna, it causes significant interference to the GPS antenna's operation.

[0031] Specifically, when the B13 band in the PDA's LTE is not operating, the GPS antenna sensitivity is -142.7 dBm. When the B13 band in the PDA's LTE is operating, the GPS antenna sensitivity is -125.3 dBm.

[0032] To address the aforementioned issues, this application provides an interference-resistant personal digital assistant.

[0033] Reference Figure 2 , Figure 2 This is a schematic diagram of the structure of an anti-interference personal digital assistant provided in an embodiment of this application. Figure 2 As shown, the interference-resistant personal digital assistant 100 may include: a radio frequency identification tag 110 disposed inside the personal digital assistant 100, an adhesive layer 120 disposed on the radio frequency identification tag 110, and a wave-absorbing material 130 attached to the radio frequency identification tag 110 through the adhesive layer 120.

[0034] After the B13 transmission signal of the personal digital assistant 100 is transmitted by the main antenna of the personal digital assistant 100, the second harmonic signal is absorbed by the absorbing material 130 to improve the sensitivity of the GPS antenna of the personal digital assistant 100. The second harmonic signal is generated by the radio frequency identification tag 110 after absorbing the B13 transmission signal.

[0035] The uplink frequency of the B13 transmit signal (TX) is 777MHz-787MHz. The B13 TX uplink frequency refers to the frequency range used by user equipment (such as mobile phones) to send signals to the base station in the B13 band.

[0036] The second harmonic signal has a frequency between 1554MHz and 1574MHz. The GPS antenna operates at a frequency of 1575.42MHz.

[0037] Because the frequency of the second harmonic signal is close to the operating frequency of the GPS antenna, it causes severe interference to the GPS antenna. Therefore, by absorbing the second harmonic signal using the absorbing material 130, interference with the GPS antenna can be avoided. This, in turn, improves the sensitivity of the GPS antenna of the personal digital assistant 100.

[0038] Furthermore, by attaching an absorbing material 130 to the RFID tag 110 via an adhesive layer 120, the absorbing material 130 absorbs the second harmonic signal. This allows for a practical, simple, and low-cost improvement in the sensitivity of the GPS antenna, enabling the personal digital assistant provided in this application to achieve interference resistance.

[0039] The interference-resistant personal digital assistant provided in this application involves placing an adhesive layer on a radio frequency identification (RFID) tag located inside the personal digital assistant, and attaching a wave-absorbing material to the RFID tag through the adhesive layer. Thus, after the personal digital assistant's B13 transmission signal is transmitted through the personal digital assistant's main antenna, the wave-absorbing material absorbs the second harmonic signal generated after the RFID tag absorbs the B13 transmission signal. This prevents the second harmonic signal from interfering with the GPS antenna, thereby improving the sensitivity of the personal digital assistant's GPS antenna. Furthermore, the interference-resistant personal digital assistant also has the advantages of low cost and simplicity.

[0040] In some examples, the frequency of the absorbing material 130 is between 1554MHz and 1574MHz. Because the frequency of the absorbing material 130 is between 1554MHz and 1574MHz, it can absorb the second harmonic signal of B13 TX within this frequency range, thus preventing the second harmonic signal from interfering with the GPS antenna.

[0041] In some examples, the permeability of the absorbing material 130 is greater than 100. This means that the permeability of the absorbing material 130 is relatively large.

[0042] In some examples, the frequency of the absorbing material 130 is between 1554MHz and 1574MHz, and the permeability of the absorbing material 130 is greater than 100. That is, the second harmonic signal of the B13 TX can be completely absorbed by the absorbing material 130, which has a frequency between 1554MHz and 1574MHz and a high permeability. This significantly reduces interference from the second harmonic signal to the GPS antenna, thereby greatly improving the sensitivity of the GPS antenna in the personal digital assistant.

[0043] Reference Figure 3 , Figure 3 This is a planar schematic diagram illustrating the attachment of a wave-absorbing material in an anti-interference personal digital assistant, as provided in an embodiment of this application. Figure 3 As shown, the center point of the RFID tag 110 coincides with the center point of the absorbing material 130. This increases the adhesion area between the absorbing material 130 and the RFID tag 110, allowing the absorbing material 130 to absorb more second harmonic signals. Furthermore, this reduces interference from second harmonic signals to the GPS antenna, thereby improving the sensitivity of the GPS antenna.

[0044] like Figure 3As shown, when the length of the absorbing material 130 is less than the length of the RFID tag 110, and the width of the absorbing material 130 is less than the width of the RFID tag 110, the sensitivity of the GPS antenna is -140.6 dBm when operating in the B13 band. Compared with related technologies, the GPS antenna of the interference-resistant personal digital assistant 100 in this application has higher sensitivity.

[0045] Reference Figure 4 , Figure 4 Another planar surface on which a wave-absorbing material is attached in an anti-interference personal digital assistant provided in this application embodiment. For example... Figure 4 As shown, the length of the absorbing material 130 is greater than the length of the RFID tag 110, and the width of the absorbing material 130 is greater than the width of the RFID tag 110. This allows the absorbing material 130 to completely cover the RFID tag 110, enabling it to absorb a significant amount of second harmonic signals. Consequently, it greatly reduces interference from second harmonic signals to the GPS antenna, thereby significantly improving the sensitivity of the GPS antenna.

[0046] Specifically, when the length of the absorbing material 130 is greater than the length of the RFID tag 110, and the width of the absorbing material 130 is greater than the width of the RFID tag 110, the sensitivity of the GPS antenna is -142.1 dBm when operating in the B13 frequency band. Compared to related technologies, the GPS antenna sensitivity of the interference-resistant personal digital assistant 100 in this application is very high, essentially consistent with the sensitivity of the GPS antenna when not operating in the B13 frequency band.

[0047] Reference Figure 5 , Figure 5 This is another planar schematic diagram illustrating the attachment of a wave-absorbing material in an anti-interference personal digital assistant, as provided in an embodiment of this application. (See diagram below.) Figure 5 As shown, when the center point of the RFID tag 110 does not coincide with the center point of the absorbing material 130, and the center point of the RFID tag 110 is located below the center point of the absorbing material 130, the sensitivity of the GPS antenna is -134.5 dBm when operating in the B13 frequency band. Compared with related technologies, the GPS antenna of the interference-resistant personal digital assistant 100 in this application has higher sensitivity.

[0048] Reference Figure 6 , Figure 6 This is another planar schematic diagram illustrating the attachment of a wave-absorbing material in an anti-interference personal digital assistant, as provided in an embodiment of this application. (See diagram below.) Figure 6As shown, when the center point of the RFID tag 110 does not coincide with the center point of the absorbing material 130, and the center point of the RFID tag 110 is located above the center point of the absorbing material 130, the sensitivity of the GPS antenna is -134.5 dBm when operating in the B13 band. Compared with related technologies, the GPS antenna of the interference-resistant personal digital assistant 100 in this application has higher sensitivity.

[0049] Reference Figure 7 , Figure 7 This is another planar schematic diagram illustrating the attachment of a wave-absorbing material in an anti-interference personal digital assistant, as provided in an embodiment of this application. (See diagram below.) Figure 7 As shown, when the center point of the RFID tag 110 does not coincide with the center point of the absorbing material 130, and the center point of the RFID tag 110 is located to the left of the center point of the absorbing material 130, the sensitivity of the GPS antenna is -139.2 dBm when operating in the B13 band. Compared with related technologies, the GPS antenna of the interference-resistant personal digital assistant 100 in this application has higher sensitivity.

[0050] Reference Figure 8 , Figure 8 This is another planar schematic diagram illustrating the attachment of a wave-absorbing material in an anti-interference personal digital assistant, as provided in an embodiment of this application. (See diagram below.) Figure 8 As shown, when the center point of the RFID tag 110 does not coincide with the center point of the absorbing material 130, and the center point of the RFID tag 110 is located to the right of the center point of the absorbing material 130, the sensitivity of the GPS antenna is -139.7 dBm when operating in the B13 frequency band. Compared with related technologies, the GPS antenna of the interference-resistant personal digital assistant 100 in this application has higher sensitivity.

[0051] In some examples, the length difference between the absorbing material 130 and the RFID tag 110 is between 0.2 mm and 1.2 mm.

[0052] In some examples, the width difference between the absorbing material 130 and the RFID tag 110 is between 0.2 mm and 1.2 mm.

[0053] More preferably, the length difference between the absorbing material 130 and the length of the RFID tag 110 is 1 mm. The width difference between the absorbing material 130 and the width of the RFID tag 110 is 1 mm. This ensures that the absorbing material 130 completely covers the RFID tag 110 while reducing the consumption of the absorbing material 130. Consequently, costs can be reduced while significantly improving the sensitivity of the GPS antenna.

[0054] In some examples, the absorbing material 130 is any one of ferrite absorbing material, carbonyl iron powder absorbing material, and nano absorbing material.

[0055] In some examples, adhesive layer 120 is any one of acrylic pressure-sensitive adhesive, epoxy resin adhesive, double-sided tape, and polyurethane adhesive.

[0056] When the absorbing material 130 is a ferrite absorbing material, the adhesive layer 120 is more preferably an epoxy resin adhesive. When the absorbing material 130 is a carbonyl iron powder absorbing material, the adhesive layer 120 is more preferably an acrylic pressure-sensitive adhesive or an epoxy resin adhesive. When the absorbing material 130 is a nano-absorbing material, the adhesive layer 120 is more preferably an epoxy resin adhesive, a polyurethane adhesive, or an acrylic pressure-sensitive adhesive.

[0057] In some examples, the thickness of the adhesive layer 120 is between 0.1 and 0.5 mm. This avoids the adhesive layer 120 being too thick, which could affect the absorption of second harmonic signals by the absorbing material 130.

[0058] in, Figures 2-8 The diagram only illustrates the position of the adhesive layer 120 within the interference-resistant personal digital assistant 100. The length and width of the adhesive layer 120 are not specifically limited; that is, the size of the adhesive layer 120 is not specifically limited. The length of the adhesive layer 120 can be relatively long or short, and this embodiment does not impose a specific limitation in this regard. The length of the adhesive layer 120 can also be relatively wide or narrow, and this embodiment does not impose a specific limitation in this regard.

[0059] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An interference-resistant personal digital assistant, characterized by The personal digital assistant includes: a radio frequency identification tag disposed inside the personal digital assistant, an adhesive layer disposed on the radio frequency identification tag, and a wave-absorbing material attached to the radio frequency identification tag through the adhesive layer; After the B13 transmission signal of the personal digital assistant is transmitted through the main antenna of the personal digital assistant, the second harmonic signal is absorbed by the absorbing material to improve the sensitivity of the GPS antenna of the personal digital assistant. The second harmonic signal is generated by the radio frequency identification tag after absorbing the B13 transmission signal.

2. The PDA of claim 1, wherein, The frequency of the absorbing material is between 1554MHz and 1574MHz.

3. The PDA of claim 1 or 2, wherein, The magnetic permeability of the absorbing material is greater than 100.

4. The PDA of claim 1, wherein, The center point of the radio frequency identification tag coincides with the center point of the absorbing material.

5. The PDA of claim 1 or 4, wherein, The length of the absorbing material is greater than the length of the RFID tag, and the width of the absorbing material is greater than the width of the RFID tag.

6. The PDA of claim 5, wherein, The length difference between the absorbing material and the RFID tag is between 0.2 mm and 1.2 mm.

7. The PDA of claim 5, wherein, The width difference between the width of the absorbing material and the width of the RFID tag is between 0.2mm and 1.2mm.

8. The PDA of claim 1, wherein, The microwave absorbing material is any one of ferrite microwave absorbing material, carbonyl iron powder microwave absorbing material, and nano microwave absorbing material.

9. The PDA of claim 1, wherein, The adhesive layer is any one of acrylic pressure-sensitive adhesive, epoxy resin adhesive, double-sided adhesive, and polyurethane adhesive.

10. The personal digital assistant according to claim 1, characterized in that, The thickness of the adhesive layer is between 0.1 and 0.5 mm.

Images