Dual feed antenna system

Abstract

The application provides a dual-fed antenna system, which includes a metal radiation part, a coupling metal part, a first signal feeding module and a second signal feeding module. In the dual-fed antenna system, the metal radiation part is located at a frame of an electronic device, and the coupling metal part has a coupling distance with the metal radiation part. The first signal feeding module is electrically connected to the metal radiation part to receive and transmit a first frequency band radio frequency signal through the metal radiation part. The second signal feeding module is electrically connected to the coupling metal part to receive and transmit a second frequency band radio frequency signal through the coupling feeding of the metal radiation part and the coupling metal part. Therefore, the application uses the function of the shared metal radiation part to achieve the dual-fed wideband operation.

Description

Technical Field

[0001] This application relates to a dual-feed antenna system that achieves multi-frequency operation using a single radiating element. Background Technology

[0002] With the rapid advancement of technology, electronic products are becoming increasingly widespread and powerful. These products all require antennas to transmit or receive radio frequency (RF) signals. However, with the advanced development of communication technology, electronic products need to support an increasing number of RF signal types, such as 4G, 5G, and Wi-Fi. This necessitates the inclusion of more antennas within these products, further reducing internal space, especially for portable electronic devices, which have the smallest footprint but require the most functionality. Therefore, finding a shared antenna configuration for broadband operation in small electronic products has become a crucial technical challenge that needs to be overcome. Summary of the Invention

[0003] The technical problem to be solved by this application is to provide a dual-feed antenna system, including a metallic radiating element, a coupling metallic element, a first signal feed module, and a second signal feed module. In the dual-feed antenna system, the metallic radiating element is located on a frame of an electronic device, and the coupling metallic element has a coupling distance between it and the metallic radiating element. The first signal feed module is electrically connected to the metallic radiating element to transmit and receive a first-band radio frequency signal through the metallic radiating element. The second signal feed module is electrically connected to the coupling metallic element to transmit and receive a second-band radio frequency signal through the coupled feed of the metallic radiating element and the coupling metallic element.

[0004] In summary, this application is a dual-feed antenna system that effectively utilizes a direct feed and a coupled feed to feed radio frequency signals into the same metal radiator. By leveraging the shared metal radiator, it achieves dual-feed multi-frequency operation and serves as a broadband design. Different metal radiators are utilized according to the needs of different frequency bands, so as to provide good antenna radiation characteristics within the supported frequency bands.

[0005] The other effects and embodiments of this application are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0006] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0007] Figure 1 This is a schematic diagram of the architecture of a dual-feed antenna system according to an embodiment of this application;

[0008] Figure 2 This is a three-dimensional structural diagram of a dual-feed antenna system located within an electronic device according to an embodiment of this application;

[0009] Figure 3 This is a schematic diagram simulating the S-parameters of a dual-feed antenna system according to an embodiment of this application under various operating states. Detailed Implementation

[0010] The embodiments of this application will be described below with reference to the relevant drawings. Furthermore, some components or structures may be omitted in the drawings of the embodiments to clearly show the technical features of this application. In these drawings, the same reference numerals denote the same or similar components or circuits. It must be understood that although the terms "first," "second," etc., can be used herein to describe various components, parts, areas, or functions, these components, parts, areas, and / or functions should not be limited by these terms. These terms are only used to distinguish one component, part, area, or function from another component, part, area, or function.

[0011] Please see Figure 1As shown, a dual-feed antenna system 10 is installed within an electronic device 30. This dual-feed antenna system 10 includes a metal radiating section 12, a coupling metal section 14, a first signal feed module 16, and a second signal feed module 18. In the dual-feed antenna system 10, the metal radiating section 12 is located on a frame of the electronic device 30. In this embodiment, when the frame of the electronic device 30 is a metal frame, this metal frame serves as the metal radiating section 12. In another embodiment, when the frame of the electronic device 30 is a plastic frame, the metal radiating section 12 is a metal section or metal strip disposed within the frame. However, this application is not limited to this, and the design of the metal radiating section 12 can vary depending on the application of the dual-feed antenna system 10. The coupling metal section 14 is located inside the metal radiating section 12 and has a coupling distance D between it and the metal radiating section 12. The first signal feed module 16 is electrically connected to the metal radiating section 12 to transmit and receive a first-band radio frequency signal through the metal radiating section 12. The first-band radio frequency signal is a low-frequency radio frequency signal. The first signal feed module 16 includes a first signal source 161 and a first matching circuit 162. The first matching circuit 162 is electrically connected between the first signal source 161 and the metal radiating section 12 to perform signal adaptation and matching. The second signal feed module 18 is electrically connected to the coupling metal section 14 to transmit and receive a second-band radio frequency signal through the coupling feed of the metal radiating section 12 and the coupling metal section 14. The second-band radio frequency signal is a mid-to-high-frequency radio frequency signal. The second signal feed module 18 includes a second signal source 181 and a second matching circuit 182. The second matching circuit 182 is electrically connected between the second signal source 181 and the coupling metal section 14 to perform signal adaptation and matching. Based on this, this application utilizes a first signal source 161 in conjunction with a first matching circuit 162 to directly feed into the metal radiating section 12 to transmit and receive first-band radio frequency signals, and utilizes a second signal source 181 in conjunction with a second matching circuit 182 and in conjunction with the coupling effect of the coupling metal section 14 to feed into the same metal radiating section 12 to transmit and receive second-band radio frequency signals, so that the dual-feed antenna system 10 achieves multi-frequency operation with dual feeding into a single metal radiating section 12.

[0012] In one embodiment, such as Figure 1 As shown, the dual-feed antenna system 10 further includes a ground plane 20 located inside the electronic device 30, and the metal radiating part 12 has a ground terminal 121 connected to the ground plane 20, so that the metal radiating part 12 is electrically connected to the ground plane 20 through the ground terminal 121, and the coupling metal part 14 is located exactly between the metal radiating part 12 and the ground plane 20.

[0013] In one embodiment, the aforementioned electronic device 30 is a mobile phone, a personal digital assistant, a tablet computer, a laptop computer, etc., but this application is not limited thereto, and any portable electronic device with mobile communication function is included in this application. In this embodiment, the electronic device 30 is a mobile phone as an example, with each component of the dual-feed antenna system 10 disposed within the electronic device 30, and the ground plane 20 being a metal plane at any suitable location within the electronic device 30.

[0014] In one embodiment, please also refer to Figure 1 and Figure 2 As shown, the first matching circuit 162 is further electrically connected to the metal radiating part 12 via a first metal spring 22 to effectively transmit signals. The second matching circuit 182 is further electrically connected to the coupling metal part 14 via a second metal spring 24 to effectively transmit signals.

[0015] In one embodiment, the design of the first matching circuit 162 and the second matching circuit 182 depends on the antenna's operating frequency, the antenna's own characteristics, and impedance requirements. They are usually composed of integrated components such as capacitors, inductors, variable capacitors, and variable inductors according to actual needs, in order to convert the antenna's input impedance into the standard impedance required by the system.

[0016] In one embodiment, the coupling metal portion 14 is further printed on a plastic part of a speaker of the electronic device 30 so that the equivalent capacitance of its coupling range can be adjusted by adjusting the structural length printed on the plastic part of the speaker.

[0017] In one embodiment, please also refer to Figure 1 and Figure 2 As shown, the metal radiating portion 12 is designed to bend in accordance with the bend of the frame of the electronic device 30, but this application is not limited to this. In another embodiment, the metal radiating portion 12 can also be designed as a straight segment. In one embodiment, the length of the metal radiating portion 12 is 40-60 mm.

[0018] Please also refer to Figure 1 and Figure 2As shown, in the dual-feed antenna system 10, when the first signal source 161 is fed into the metal radiator 12 through the first matching circuit 162, the metal radiator 12 is responsible for exciting a low-frequency operating mode with a resonant frequency between 600 and 960 MHz. By adjusting the length and width of the metal radiator 12, the frequency and impedance matching of the low-frequency operating mode can be adjusted. The second signal source 181 is fed into the coupling metal part 14 through the second matching circuit 182. The coupling metal part 14 and the metal radiator 12 are responsible for exciting a mid-to-high frequency operating mode with a resonant frequency between 1710 and 2690 MHz. By adjusting the length of the coupling metal part 14 and the coupling distance D, the frequency and impedance matching of the mid-to-high frequency operating mode can be adjusted. Therefore, combining the aforementioned low-frequency and mid-to-high frequency operating modes, the dual-feed antenna system 10 of this application can meet the operating bandwidth requirements of the low-frequency, mid-frequency, and high-frequency operating bands for mobile communication without increasing the antenna size.

[0019] Furthermore, this application utilizes the coupling feed of the coupling metal part 14, which is equivalent to using the equivalent capacitance generated by the coupling interval of this structure as the capacitor of the high-pass filter, and does not require additional components to block the signal in the low frequency band and allow the signal (second frequency band radio frequency signal) to pass through in the mid-to-high frequency band. Therefore, this dual-feed antenna system 10 can produce good isolation.

[0020] Figure 3 For a schematic diagram of S-parameter simulation of an embodiment of the dual-feed antenna system according to this application, please also refer to... Figure 1 and Figure 3 As shown, to demonstrate that the dual-feed antenna system 10 proposed in this application does indeed have good isolation performance, S-parameter simulation analysis was performed on the aforementioned dual-feed antenna system 10 during radio frequency signal transmission. The S-parameter simulation results for the dual-feed antenna system 10 in the low-frequency operating band and the mid-to-high-frequency operating band are as follows: Figure 3 As shown, by Figure 3 As shown by the curves, the return losses (S11, S22) displayed on the graph are both less than -10dB (S11 < -10dB, S22 < -10dB) in both the low-frequency and mid-to-high-frequency operating bands, proving that the system has good reflection performance in both bands and achieves a wide operating bandwidth. Furthermore, in the low-frequency operating band, the isolation curve (S21) displayed on the graph is less than -16dB, indicating good isolation and significantly improving the isolation between the two signal sources.

[0021] In summary, this application provides a dual-feed antenna system that effectively utilizes both a direct feed and a coupled feed to feed radio frequency signals into the same metallic radiating element. By leveraging the shared metallic radiating element, it achieves multi-frequency operation with dual feeding. As a wideband design, it utilizes different metallic radiating elements according to the requirements of different frequency bands, providing good antenna radiation characteristics across the supported frequency bands. Therefore, this application can simultaneously achieve operating bandwidths in low-frequency bands (600–960 MHz), mid-frequency bands (1710 MHz–2170 MHz), and high-frequency bands (2300–2690 MHz) for mobile communications, enabling wideband operation in small electronic devices.

[0022] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of this application, and are not intended to limit the implementation methods of the technology of this application in any way. Any person skilled in the art may make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in this application, but these should still be regarded as the technology or embodiments that are substantially the same as those of this application.

Claims

1. A dual-feed antenna system, characterized in that, The dual-feed antenna system includes: Metal radiating section, located on the frame of the electronic device; A coupling metal portion having a coupling gap with the metal radiating portion; A first signal feed module is electrically connected to the metal radiating section to transmit and receive first-band radio frequency signals through the metal radiating section; and The second signal feed module is electrically connected to the coupling metal part to transmit and receive second-band radio frequency signals through the coupling feed of the metal radiating part and the coupling metal part.

2. The dual-feed antenna system according to claim 1, characterized in that, The first signal feed module further includes: First signal source; and A first matching circuit is electrically connected between the first signal source and the metal radiating part.

3. The dual-feed antenna system according to claim 2, characterized in that, The first matching circuit is further electrically connected to the metal radiating part via a first metal spring.

4. The dual-feed antenna system according to claim 1, characterized in that, The second signal feed module further includes: Second signal source; and The second matching circuit is electrically connected between the second signal source and the coupled metal part.

5. The dual-feed antenna system according to claim 4, characterized in that, The second matching circuit is further electrically connected to the coupling metal part via a second metal spring.

6. The dual-feed antenna system according to claim 1, characterized in that, The first frequency band radio frequency signal is a low frequency band radio frequency signal; and the second frequency band radio frequency signal is a mid-to-high frequency band radio frequency signal.

7. The dual-feed antenna system according to claim 1, characterized in that, The metal radiating part further has a grounding terminal.

8. The dual-feed antenna system according to claim 7, characterized in that, It also includes a ground plane located inside the electronic device, which connects the metal radiating part to the ground plane through the grounding terminal.

9. The dual-feed antenna system according to claim 1, characterized in that, When the frame of the electronic device is a metal frame, the metal frame serves as the metal radiating part.

10. The dual-feed antenna system according to claim 1, characterized in that, The metal radiating part is a metal part or metal strip located on the frame of the electronic device.

11. The dual-feed antenna system according to claim 1, characterized in that, The coupling metal portion is printed on the plastic part of the speaker enclosure of the electronic device.

12. The dual-feed antenna system according to claim 1, characterized in that, The electronic device mentioned is a mobile phone, personal digital assistant, tablet computer, or laptop computer.

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