TWI536671B - Single loop multi - frequency antenna - Google Patents

Description

Single loop multi-frequency antenna

The present invention relates to a single-loop multi-frequency antenna, and more particularly to a multi-frequency antenna that converts the conduction length of a conduction line through a switching device to generate multiple functions.

Near Field Communication (NFC), also known as short-range wireless communication, is a short-range high-frequency wireless communication technology that enables non-contact peer-to-peer data transmission between electronic devices at 20 cm. Data transfer within the distance. According to international regulations, its operating frequency is 13.56 MHz, and the transmission speed is 106 Kbit/s, 212 Kbit/s or 424 Kbit/s.

Wireless charger, also known as inductive charging, non-contact inductive charging, is a device that uses near-field sensing, that is, inductive coupling, to transfer energy to a powered device by a power supply device (charger). Use the received energy to charge the battery and at the same time use it for its own operation. Since the charger and the electric device transmit energy by inductive coupling, there is no wire connection between the two, so the charger and the electric device can be exposed without conductive contacts. There are three main types of wireless charging technologies in the industry today: electromagnetic induction (magnetic resonance), and radio frequency (radio frequency).

The above two functions are important functions in today's electronic devices. However, modern electronic products pursue product aesthetics, and it is necessary to design high-efficiency and miniaturized antenna coils in a limited volume, and various antenna coils need to be disposed inside the electronic products, but The energy emitted by various antennas and the circuit of the electronic device will be electromagnetically interfered with each other. Therefore, in general, a plurality of different functional antennas are not simultaneously disposed in the electronic device, and although the Samsung S3 smart phone is available on the market today. Two different functions of Near Field Communication (NFC) and Wireless Charger. However, when using wireless charging, you need to manually install a wireless charging coil to perform wireless charging for near field communication. In the function, the above wireless charging coil must be disassembled and another near field communication coil is installed to perform near field communication. In view of this, it is necessary to provide a variety of different types without the above complicated operation. The functional antenna is simultaneously placed in the coil design structure inside the electronic product.

The main object of the present invention is to connect a spiral loop-shaped loop antenna to a switching device, and the switching device changes the conduction length between the first output point and the second output point to form different resonant function frequencies, further different The coil conduction length and the function frequency constitute a plurality of coil functions, and a loop antenna can be realized by the switching means of the switching device to have various functions, and is suitable for charging and transmission requirements of a plurality of different frequencies, thereby improving industrial applications. Sex.

The secondary object of the present invention is to provide a single-loop multi-frequency antenna, and it is not necessary to separately provide a plurality of coils of different functions, so that the reduction coil accounts for the internal volume of the electronic device.

Another object of the present invention is to switch the coil action through the switching device, thereby avoiding electromagnetic interference between the coils caused by different types of coils being separately disposed.

To achieve the foregoing objective, a single-loop multi-frequency antenna according to a first embodiment of the present invention includes: a single-loop multi-frequency antenna comprising: a loop antenna having a first output point and a second output point, and Forming a loop circuit between the first output point and the second output point; and a first switching device connected to the loop antenna to form a first open circuit segment and a first short circuit segment; wherein A switching device selectively acts by the first shorting section or the first breaking section, and a first conduction length and a second conduction length are formed between the first output point and the second output point.

The first switching device may be one of a manual switch, a relay, a diode, an IC circuit, a filter, and a radio frequency switch.

The multi-frequency antenna is disposed on at least one of the substrates, and the substrate is one of an independent dielectric substrate and a multi-layer substrate.

In the second embodiment, the multi-frequency antenna can be disposed on an upper surface and a lower surface of the substrate at the same time, and a hole is disposed on the upper surface and the lower surface of the substrate, and the hole is used to pierce a line. by.

In the third embodiment, the first switching device further forms a second open circuit segment and a second short circuit portion on the loop antenna.

The first switching device is selectively acted upon by the second short circuit segment or the second circuit segment to cooperate with the first short circuit segment or the first circuit segment to form a gap between the first output point and the second output point. a third conduction length different from the first and second conduction lengths described above.

In the fourth embodiment, a second switching device is further connected to the loop antenna to further form a second disconnecting section and a second shorting section.

The second switching device may be one of a manual switch, a relay, a diode, an IC circuit, a filter, and an RF switch.

The second switching device is selectively acted upon by the second short-circuiting section or the second open-circuiting section alone or in cooperation with the first switching device to selectively act by the first short-circuited section or the first open-circuited section to make the first A third conduction length different from the first and second conduction lengths is formed between the output point and the second output point.

The invention is characterized in that the switching device switches the working state of the breaking section and the short-circuiting section to change the conduction length on the coil, thereby forming a plurality of resonance function frequencies, so that a single-loop helical coil can have a plurality of different functions. In turn, the purpose of reducing the coil volume, avoiding electromagnetic interference, and achieving multi-functional industrial applicability is achieved.

In order to further clarify and understand the structure, the use and the features of the present invention, the preferred embodiment is described in detail with reference to the following drawings:

Referring to FIG. 1, a single-loop multi-frequency antenna 1 according to a first embodiment of the present invention is composed of a loop antenna 10 and a first switching device 21. The loop antenna 10 has a first output point 101 and a a second output point 102, and a loop line is formed between the first output point 101 and the second output point 102, and the loop line is formed by the second output point 102 to form a spiral pattern; The switching device 21 can be one of a manual switch, a relay, a diode, an IC circuit, a filter, and an RF switch, and the filter can be a high pass filter, a low pass filter, or a band pass filter.

Referring to FIG. 1 , the loop antenna 10 is connected to a first switching device 21 , and the first switching device 21 forms a first control point 103 a and a second control point 103 b above the loop antenna 10 . Between the first control point 103a and the second control point 103b, a first disconnecting section 104a and a first short-circuiting section 105a are formed through the first unwinding first switching device 21, and the first disconnecting section 104a and the first switching section are switched. The active state of a short circuit section 105a causes a different conduction length 106 to be conducted between the first output point 101 and the second output point 102.

As shown in FIG. 1 , the single-loop multi-frequency antenna 1 can be disposed above a substrate 3 , and the substrate 3 is configured as one of an independent dielectric substrate 3 and a multi-layer substrate 3 . The loop antenna 10 of the single-loop multi-frequency antenna 1 described above is directly formed of an enameled wire material, and the single-loop multi-frequency antenna 1 is preferably disposed above the substrate 3.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , the switching device 2 can be connected to the first control point 103 a of the loop antenna 10 and the second control point 103 b through a line 4 , as shown in FIG. 1 . In the aspect, the first output point 101 can be set as the second control point 103b and the control point 103 can be connected to the first switching device 21 as shown in FIG. 2, or a preferred embodiment as shown in FIG. The second output point 102 is set as the first control point 103b, and the control point 103 is connected to the first switching device 21 as shown in the figure.

As shown in FIG. 4A, when the first switching device 21 switches the first short circuit segment 105a between the first control point 103a and the second control point 103b, the current flows from the first output point 101 to the first control. The point 103a flows through the first short-circuit section 105a, so the first conduction length 106a is the length of the line segment between the first output point 101 and the first control point 103a, and the first conduction length 106a forms a first functional frequency. In a possible embodiment, the first functional frequency is 13.6 MHz, so that the single-loop multi-frequency antenna 1 generates a wireless transmission function, whereby the electronic device can perform a wireless transmission function.

As shown in FIG. 4B, when the switching device 2 switches the first open circuit segment 104a between the first control point 103a and the second control point 103b, the current flows from the first output point 101 to the first control point 103a. And flowing through the first breaking section 104a to the second output point 102, such that a second conductive length 106b is formed as a length between the first output point 101 and the second output point 102, and the second conductive length 106b has A second functional frequency, in a possible embodiment, the second functional frequency may be a wireless charging frequency, such that the electronic device can perform a wireless charging function.

The second conductive length size is > the first conductive length, and the second functional frequency is < the first functional frequency.

As shown in FIGS. 5A and 5B, the second embodiment of the loop antenna 10 of the single-loop multi-frequency antenna 1 of the present invention is disposed on an upper surface 31 of a substrate 3, and the other single-loop multi-frequency antenna 1 is returned. The loop antenna 10 is disposed on the lower surface 32 of the substrate 3, and the loop antennas 10 of the two single-loop multi-frequency antennas 1 are spirally wound in the same direction, and on the upper surface 31 and the lower surface 32 of the substrate 3 A hole 33 is provided in FIG. 5B, and the hole 33 is used to pass a line 4 through, so that a current can flow through the line 4 in the hole 33 and flow through the loop on the upper surface 31 and the lower surface 32 of the substrate 3. The antenna 10 allows the loop antennas 10 located on the upper surface 31 and the lower surface 32 of the substrate 3 to operate.

Another possible second embodiment is to apply the single-loop multi-frequency antenna 1 of the present invention to the multi-layer substrate 3, and a hole 33 is formed on the upper surface 31 and the lower surface 32 of each substrate 3, and is electrically connected by a line 4, respectively. A plurality of single-loop multi-frequency antennas 1 are formed above the structure of the multi-layer substrate 3, as shown in FIG. 6, and each of the substrates 3 is connected to each other by a line 4 passing through the holes 33, so that current can pass through the holes 33. The line 4 flows through the loop antenna 10 on the upper surface 31 and the lower surface 32 of each of the substrates 3, and flows through the line 4 to the next substrate 3.

As shown in FIG. 7 , in the third embodiment of the present invention, the first switching device 21 is connected to the loop antenna 10 and has a first control point 103a and a second control point 103b, and further defines a third control point 103c. .

As shown in FIGS. 7 and 8A-8D, a first disconnecting section 104a and a first short-circuiting section 105a are formed between the first control point 103a and the second control point 103b through the first switching device 21, and the second A second disconnecting section 104b and a second short-circuiting section 105b are formed between the control point 103b and the third control point 103c through the first switching device 21, and the third control point 103c and the second output point 102 are exposed. The first switching device 21 forms a third open circuit section 104c and a third short circuited section 105c.

As shown in FIG. 7 and FIG. 8A, when the first switching device 21 switches the first short-circuiting section 105a, the second short-circuiting section 105b, and the third short-circuiting section 105c, the current flows through the first output point 101 to The first control point 103a flows through the first short circuit section 105a, the second short circuit section 105b, and the third short circuit section 105c, so that a first conductive length 106a is formed as the first output point 101 to the first control point 103a. The length of the line segment between the first conductive lengths 106a forms a first functional frequency.

As shown in FIG. 7 and FIG. 8B, when the first switching device 21 is switched to the first disconnecting section 104a, the second short-circuiting section 105b, and the third short-circuiting section 105c, current flows through the first output point 101. After the first control point 103a and the second control point 103b, the second short-circuit section 105b and the third short-circuit section 105c are formed, so that a second conductive length 106b is formed as the first output point 101 to the second control point. The length of the line segment between 103b, the second conductive length 106b forms a second functional frequency.

As shown in FIG. 7 and FIG. 8C, when the first switching device 21 is switched to the first disconnecting section 104a, the second disconnecting section 104b, and the third short-circuiting section 105c, the current flows through the first output point 101. After the first control point 103a, the second control point 103b and the third control point 103c, the third short-circuit section 105c flows, so that a third conduction length 106c is formed as the first output point 101 to the third control point 103c. The length of the line segment between the third conductive lengths 106c forms a third functional frequency.

As shown in FIG. 7 and FIG. 8D, when the first switching device 21 is switched to the first disconnecting section 104a, the second disconnecting section 104b, and the third disconnecting section 104c, the current flows through the first output point 101. After the first control point 103a, the second control point 103b, and the third control point 103c to the second output point 102, a fourth conduction length 106d is formed as the length of the line segment between the first output point 101 and the second output point 102. The fourth conduction length 106d forms a fourth functional frequency.

The fourth conduction length size>the third conduction length size>the second conduction length size>the first conduction length size, and the fourth functional frequency size<the third functional frequency size<the second functional frequency size<the first functional frequency size .

9A-9D is another circuit diagram of the third embodiment of the present invention. The first control point 103a and the second output point 102 form a first open circuit through the first switching device 21 (refer to FIG. 7). The section 104a and the first short-circuit section 105a, between the second control point 103b and the second output point 102, form a second disconnecting section 104b and a second short-circuit through the first switching device 21 (refer to FIG. 7). In the segment 105b, a third disconnecting section 104c and a third short-circuiting section 105c are formed between the third control point 103c and the second output point 102 through the first switching device 21 (see FIG. 7).

As shown in FIG. 7 and FIG. 9A, when the first switching device 21 is switched to the first short-circuiting section 105a, a current flows from the first output point 101 to the first control point 103a, that is, through the first short-circuiting area. The segment 105a forms a first conduction length 106a which is the length of the line segment between the first output point 101 and the first control point 103a. The first conduction length 106a forms a first functional frequency.

As shown in FIG. 7 and FIG. 9B, when the first switching device 21 is switched to the first disconnecting section 104a and the second short-circuiting section 105b, current flows from the first output point 101 to the first control point 103a and After the second control point 103b flows through the second short circuit section 105b, a second conduction length 106b is formed as a line segment length between the first output point 101 and the second control point 103b, and the second conduction length 106b forms a The second functional frequency.

As shown in FIG. 7 and FIG. 9C, when the first switching device 21 is switched to the first disconnecting section 104a, the second disconnecting section 104b, and the third short-circuiting section 105c, the current flows through the first output point 101. After the first control point 103a, the second control point 103b and the third control point 103c, the third short-circuit section 105c flows, so that a third conduction length 106c is formed as the first output point 101 to the third control point 103c. The length of the line segment between the third conductive lengths 106c forms a third functional frequency.

As shown in FIG. 7 and FIG. 9D, when the first switching device 21 is switched to the first disconnecting section 104a, the second disconnecting section 104b, and the third disconnecting section 104c, the current flows through the first output point 101. After the first control point 103a, the second control point 103b, and the third control point 103c to the second output point 102, a fourth conduction length 106d is formed as the length of the line segment between the first output point 101 and the second output point 102. The fourth conduction length 106d forms a fourth functional frequency.

The fourth conduction length size>the third conduction length size>the second conduction length size>the first conduction length size, and the fourth functional frequency size<the third functional frequency size<the second functional frequency size<the first functional frequency size .

As shown in FIG. 10, a switching device 2 has a first switching device 21, a second switching device 22, and a third switching device 23. The first switching device 21 is connected to the loop antenna. 10, having a first control point 103a; the second switching device 22 is connected to the loop antenna 10 and has a second control point 103b; and further a third switching device 23 is connected to the loop antenna 10 to have a third Control point 103c.

The first switching device 21, the second switching device 22, and the third switching device 23 may be one of a manual switch, a relay, a diode, an IC circuit, a filter, and an RF switch, and the filter may be a high-pass filter. , low pass filter or band pass filter.

Referring to FIGS. 8A-8D, the first control point 103a and the second control point 103b are separated from each other by a first switching device 21 (see FIG. 10) to form a first disconnecting section 104a or a short circuit section 105a, the second control point 103b and the third control point 103c are connected to the second switch device 22 (see FIG. 10) to form a second open circuit segment 104b or a second short circuit portion 105b. A third breaking section 104c or a third short-circuiting section 105c is formed between the third control point 103c and the second output point 102 through the upper third switching device 23 (see FIG. 10).

Referring to FIGS. 9A-9D, a first control point 103a and a second control point 103b are provided by connecting the above-mentioned loop coil by the first switching device 21 (refer to FIG. 10), and further Having a third control point 103c, the first control point 103a and the second output point 102 form a first open circuit segment 104a or a first short circuit segment 105a through the first switch device 21 (see FIG. 10). A second disconnecting section 104b or a second short-circuiting section 105b is formed between the second control point 103b and the second output point 102 through the second switching device 22 (see FIG. 10). The third control point 103c A third disconnecting section 104c or a third short-circuiting section 105c is formed between the second output point 102 and the third switching device 23 (see FIG. 10).

The fourth embodiment is different from the above-described third embodiment in that the third embodiment controls a plurality of control points 103 by a first switching device 21 (see FIG. 7), and the fourth embodiment uses a plurality of switches. The device 2 (please refer to FIG. 10) controls a plurality of control points 103, respectively. Since the circuit diagram of the fourth embodiment is the same as that of the third embodiment, it will not be described here.

The single-loop multi-frequency antenna 1 of the present invention can be applied to a charging board directly and perform various functions such as near field communication and wireless charging functions on the electronic device, or in another preferred embodiment, can be disposed on the electronic device 5. The internal battery 51 is as shown in FIG. 11, so that the charger can directly charge the battery 51 of the electronic device 5, and the electronic device 5 also has a near field communication function for data transmission.

In summary, the present invention is characterized in that a loop antenna having a loop-type circuit can be connected to a switching device, and by switching the switch device, a loop antenna has a plurality of different functions and receiving frequencies. And the switching means of the above switching device can also avoid the problem of electromagnetic interference between different working coils, and at the same time improve the conventional separation of the coils of different functions to cause the lack of occupied space. In summary, the present invention The purpose of the multi-frequency multi-frequency coil is realized by the above-mentioned structure, the coil occupation volume is reduced, and the utility of the coil industry is improved.

The above embodiments are used for convenience only to illustrate that the present invention is not limited. In the spirit of the creative spirit, all kinds of simple deformations and modifications made by those skilled in the industry in accordance with the scope of the patent application and the creative description of the creation should still be It is included in the scope of the following patent application.

1---Single-loop multi-frequency antenna 10---loop antenna 101---first output point 102---second output point 103---control point 103a---first control point 103b--- Second control point 103c---third control point 104a---first open circuit section 104b---second open circuit section 104c---third open circuit section 105a---first short circuit section 105b- - second short circuit section 105c - third short circuit section 106 - - conduction length 106a - first conduction length 106b - second conduction length 106c - third conduction length 106d - Fourth conduction length 2 - switch device 21 - first switch device 22 - second switch device 23 - third switch device 3 - substrate 31 - upper surface 32 - under Surface 33---hole 4---line 5---electronic device 51---battery

1 is a schematic structural view of a first embodiment of a single-loop multi-frequency antenna according to the present invention; FIG. 2 is a schematic diagram of another structure of a single-loop multi-frequency antenna according to a first embodiment of the present invention; 4A-4B is a circuit diagram of a single-loop multi-frequency antenna according to the present invention; FIG. 5A is a schematic diagram of a front structure of a second embodiment of a single-loop multi-frequency antenna according to the present invention; FIG. 6 is a schematic structural view of another feasible second embodiment of a single-loop multi-frequency antenna according to the present invention; FIG. 7 is a schematic structural view of a third embodiment of a single-loop multi-frequency antenna according to the present invention; 8A-8D are circuit diagrams of a third embodiment of a single-loop multi-frequency antenna according to the present invention; and FIGS. 9A-9D are another structural circuit diagram of a third embodiment of a single-loop multi-frequency antenna according to the present invention; FIG. 11 is a schematic diagram showing the actual use state of the single-loop multi-frequency antenna of the present invention.

1---Single-loop multi-frequency antenna 10---loop antenna 101---first output point 102---second output point 103---control point 103a---first control point 103b--- Second control point 2---switching device 21---first switching device 3---substrate 4---line

Claims (9)

A single-loop multi-frequency antenna comprising: a loop antenna having a first output point and a second output point, and forming a loop line between the first output point and the second output point; and the first switch The device is connected to the loop antenna to form a first open circuit segment and a first short circuit portion; wherein the first switching device selectively acts by the first short circuit segment or the first open circuit segment, A first conduction length and a second conduction length are formed between the first output point and the second output point. The single-loop multi-frequency antenna according to claim 1, wherein the first switching device can be one of a manual switch, a relay, a diode, an IC circuit, a filter, and a radio frequency switch. The single-loop multi-frequency antenna according to claim 1, wherein the first switching device further forms a second disconnecting section and a second short-circuiting section on the loop antenna. The single-loop multi-frequency antenna of claim 3, wherein the first switching device selectively acts or cooperates with the first short-circuit section or the first by the second short-circuit section or the second open-circuit section. The breaking section acts to form a third conduction length different from the first and second conduction lengths between the first output point and the second output point. The single-loop multi-frequency antenna according to claim 1, wherein a second switching device is connected to the loop antenna to further form a second disconnecting section and a second short-circuiting section. The single-loop multi-frequency antenna according to claim 5, wherein the second switching device is one of a manual switch, a relay, a diode, an IC circuit, a filter, and an RF switch. The single-loop multi-frequency antenna according to claim 5, wherein the second switching device is selectively operated by the second short-circuiting section or the second disconnecting section alone or in cooperation with the first switching device. Acting by the first short circuit section or the first circuit breaking section to form a third conduction length different from the first and second conduction lengths between the first output point and the second output point. The single-loop multi-frequency antenna according to claim 1, wherein the multi-frequency antenna is disposed on at least one of the substrates, and the substrate is one of an independent dielectric substrate and a multi-layer substrate. The single-loop multi-frequency antenna according to claim 8, wherein the multi-frequency antenna is simultaneously disposed on an upper surface and a lower surface of the substrate, and is respectively disposed on an upper surface and a lower surface of the substrate. A hole for passing a line through.