Low-profile multiband antenna

Abstract

The utility model relates to the technical field of antennas, in particular to a low-profile multiband antenna, which comprises a first dual-band antenna, a second ground coupling section and an antenna grounding section for providing a grounding current loop for the whole antenna, the first dual-frequency antenna is provided with a signal feed-in point arranged on the antenna grounding section and two PIFA oscillators which are unfolded left and right along the signal feed-in point, the two PIFA oscillators are respectively a low-frequency PIFA oscillator and a high-frequency PIFA oscillator, the low-frequency PIFA oscillator is unfolded towards the right side of the signal feed-in point, and the height difference between the low-frequency PIFA oscillator and the ground forms a specific waveguide coupling coefficient so as to form open radiation; the high-frequency PIFA oscillator is unfolded towards the left side of the signal feed-in point, and a specific waveguide coupling coefficient is formed by the height difference between the high-frequency PIFA oscillator and the ground so as to form open radiation; through the innovative coupling design of the second ground coupling joint and the low-frequency PIFA oscillator, the length of the low-frequency PIFA oscillator is effectively shortened, so that the height profile of the whole antenna is reduced, and the antenna can be easily adapted in equipment with limited space.

Description

Technical Field

[0001] This utility model relates to the field of antenna technology, and in particular to a low-profile multi-band antenna. Background Technology

[0002] With the rapid development of short-range wireless communication network technology, the penetration rate of various mobile terminal devices in society is increasing rapidly. WiFi and 5G networks represent a huge market with immense development potential. Ultra-broadband backbone networks bring abundant network information resources, enabling the creation of information tailored to individual needs through high-speed broadband. This also allows individuals, families, and businesses to achieve new market models such as remote control applications. Among these, wireless access is the most convenient and fastest communication method because it saves significant network deployment costs, easily achieving flexible access anytime, anywhere, and is relatively simple to maintain. WiFi 6E and WiFi 7 technologies are ultra-high-speed, ultra-broadband communication technologies. These technologies utilize the combined use of ultra-broadband frequency ranges and ultra-fast channel technologies to easily achieve single-channel operating speeds exceeding 1200Mbps. In today's rapidly developing WiFi technology, the number of operating frequency bands and signal ports is increasing daily, leading to a rapid rise in the number of antennas. However, product space cannot expand accordingly, resulting in increasingly stringent requirements for antenna size. Therefore, minimizing antenna size has always been a focus of attention. In order to reduce antenna size, various coupling methods have gradually been combined with the original antenna design methods.

[0003] Conventional single-unit PIFA antennas have advantages such as simple structure, light weight, conformal design, low manufacturing cost, and high radiation efficiency. Figure 1 The diagram shows a typical PIFA antenna structure. By corresponding to a length of 1 / 4λ with the center frequency, the effect of resonant radiation of electromagnetic waves can be achieved. Due to its simple structure, the PIFA antenna is very suitable for on-chip systems. Moreover, the PIFA antenna only requires a metal conductor and appropriate feed line to connect to the signal port, resulting in low manufacturing costs and allowing it to be directly soldered onto the PCB board. However, conventional PIFAs are internal antennas, occupying internal space, so size requirements are very stringent. Utility Model Content

[0004] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0005] A low-profile multiband antenna includes a first dual-band antenna, a second ground coupling section, and an antenna grounding section that provides a ground current loop for the entire antenna.

[0006] The first dual-band antenna has a signal feed point set on the antenna ground section and two PIFA elements extending to the left and right along the signal feed point. The two PIFA elements are a low-frequency PIFA element and a high-frequency PIFA element. The low-frequency PIFA element extends to the right of the signal feed point and forms a specific waveguide coupling coefficient with the ground to form open radiation due to the height difference. The high-frequency PIFA element extends to the left of the signal feed point and forms a specific waveguide coupling coefficient with the ground to form open radiation due to the height difference.

[0007] The second ground coupling section forms a bent rising section at the ground end, which forms a coupling capacitor C with the low-frequency PIFA oscillator. This coupling capacitor C is set to be calculated in parallel with the capacitive reactance Cε in the equivalent air radiation to obtain the shortening coefficient of the low-frequency PIFA oscillator, so as to reduce the length of the low-frequency PIFA oscillator.

[0008] Preferably, the low-frequency PIFA oscillator and the high-frequency PIFA oscillator are configured such that the lengths from the signal feed point to the end of their respective resonant nodes are determined by the formula 0.2λ, where λ = C / f, C is the speed of light in free space, and f is the antenna operating frequency. The low-frequency PIFA oscillator resonates at a frequency of 2.45 GHz, and the high-frequency PIFA oscillator resonates at a frequency of 5.5 GHz.

[0009] Preferably, the second ground coupling section forms a bent rising section at the ground end. This bent rising section forms a coupling current with the low-frequency PIFA oscillator. The coupling current is used to connect in parallel with the resonant current generated by the air radiation capacitor, so as to effectively reduce the length of the low-frequency PIFA oscillator.

[0010] Preferably, the low-profile multi-band antenna is made of metal materials, or the low-profile multi-band antenna is printed on the motherboard PCB.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] Through a unique first dual-band antenna design, the low-frequency PIFA vibrator and the high-frequency PIFA vibrator resonate at 2.45GHz and 5.5GHz frequencies respectively, effectively covering the WIFI6 / WIFI6E / WIFI7 frequency bands and extending to other frequency points. This meets the needs of various wireless communication standards, greatly improves the antenna's applicability and versatility, and allows a single antenna to function in different wireless application scenarios. It reduces the device's dependence on multiple antennas and contributes to the miniaturization of the device design.

[0013] By using the parallel calculation of the coupling capacitance C formed by the bent rising section at the ground end of the second ground coupling section and the low-frequency band PIFA vibrator, and the air equivalent radiation capacitance Cε, a shortening factor is obtained to reduce the length of the low-frequency PIFA vibrator. This design breaks through the limitation of the large size of traditional PIFA antennas in the low-frequency band. While achieving low-frequency resonance, it effectively reduces the overall profile of the antenna, making it easier to install and arrange in space-constrained equipment, and also contributing to the compactness and aesthetics of the equipment's appearance design.

[0014] The low-frequency PIFA vibrator generates open radiation by creating a specific waveguide coupling coefficient based on the height difference between itself and the ground. The same applies to the high-frequency PIFA vibrator. This design ensures that the antenna has stable and efficient radiation characteristics in all operating frequency bands, effectively transmitting and receiving electromagnetic wave signals, reducing signal loss and interference during transmission, thereby improving the overall performance of the wireless communication system and ensuring the stability and high speed of data transmission.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a conventional PIFA antenna structure.

[0018] Figure 2 This is the frequency curve diagram of the low profile multi-band of this utility model.

[0019] Figure 3 This is a three-dimensional structural schematic diagram of the low-profile multi-band antenna of this utility model;

[0020] Figure 4 This is a front structural schematic diagram of the low-profile multi-band antenna of this utility model.

[0021] The reference numerals and names in the figure are as follows:

[0022] Signal feed point 11, low-frequency PIFA vibrator 12, high-frequency PIFA vibrator 13, bent rising section 21, antenna grounding section 30. Detailed Implementation

[0023] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] Please see Figure 2-4 In this embodiment of the present invention, a low-profile multi-band antenna includes a first dual-band antenna, a second ground coupling section, and an antenna grounding section 30 that provides a ground current loop for the entire antenna.

[0025] The first dual-band antenna has a signal feed point 11 set on the antenna ground section 30 and two PIFA elements extending to the left and right of the signal feed point 11. The two PIFA elements are a low-frequency PIFA element 12 and a high-frequency PIFA element 13. The low-frequency PIFA element 12 extends to the right of the signal feed point 11 and forms a specific waveguide coupling coefficient with the height difference with the ground to form open radiation. The high-frequency PIFA element 13 extends to the left of the signal feed point 11 and forms a specific waveguide coupling coefficient with the height difference with the ground to form open radiation.

[0026] The second ground coupling section adopts a bent rising section 21 at the ground end to form a coupling capacitor C with the low-frequency PIFA oscillator 12. This coupling capacitor C is set to be calculated in parallel with the capacitive reactance value Cε in the equivalent radiation of air to obtain the shortening coefficient of the low-frequency PIFA oscillator 12, so as to reduce the length of the low-frequency PIFA oscillator 12.

[0027] In the above technical solution, the innovative coupling design between the second ground coupling section and the low-frequency PIFA vibrator 12 effectively shortens the length of the low-frequency PIFA vibrator, thereby reducing the overall height profile of the antenna. This allows it to be easily adapted to space-constrained devices such as smartphones, tablets, and small IoT devices, avoiding the obstruction of the layout of other components inside the device due to the large size of the antenna. This provides strong support for the miniaturization and thinning of the device.

[0028] The organic combination of the antenna grounding section 30, the first dual-frequency antenna, and the second ground coupling section forms a relatively compact and fully functional antenna module. The cooperation between the components reduces the overall space occupied by the antenna and improves the stability and reliability of the antenna structure. This facilitates efficient assembly and debugging during equipment production, reducing production costs and production cycle.

[0029] Two PIFA oscillators form a specific height difference with the ground and generate a corresponding waveguide coupling coefficient to form open radiation. This design optimizes the antenna's radiation mode, enabling the antenna to effectively convert electrical energy into electromagnetic waves and radiate them into space in various operating frequency bands. At the same time, it can better receive electromagnetic wave signals from space, reduce energy loss and reflection during signal transmission, thereby improving the antenna's radiation efficiency and gain, and ensuring long-distance and high-quality wireless communication connections.

[0030] The coupling capacitance C between the second ground coupling section and the low-frequency PIFA element 12 is calculated in parallel with the air equivalent radiated capacitance Cε. This not only shortens the length of the low-frequency PIFA element but also provides a precise and flexible means for antenna frequency tuning. By adjusting the parameters of the coupling capacitance, the resonant frequency of the antenna can be fine-tuned to better match the wireless frequency band requirements in practical applications, improving the antenna's adaptability and compatibility under different operating environments and communication standards.

[0031] The antenna can be manufactured as an independent antenna using metal stamping, which is conducive to large-scale production, ensures the antenna's mechanical strength and consistency, and facilitates standardized quality control. Alternatively, it can be manufactured using metal materials, suitable for applications requiring high antenna structural strength and stability. It can also be directly fabricated on the motherboard PCB using printing, a process that tightly integrates with the overall circuitry PCB, reducing the length and complexity of connection lines between the antenna and other circuit components, lowering signal transmission loss and electromagnetic interference, improving the overall integration and reliability of the device, and providing greater flexibility for miniaturized design.

[0032] Due to its multi-band characteristics, excellent electrical performance, and flexible manufacturing process, this antenna can be widely used in numerous wireless communication devices, including consumer electronics, smart home devices, industrial IoT devices, and other devices requiring wireless communication capabilities. In various application scenarios, this antenna can operate stably and reliably, providing an efficient communication link for wireless data transmission between devices, thus promoting the popularization and expansion of wireless communication technology across various fields.

[0033] Preferably, the low-frequency PIFA element 12 and the high-frequency PIFA element 13 are configured such that the lengths from the signal feed point 11 to the end of their respective resonant sections are determined by the formula 0.2λ, where λ = C / f, C is the speed of light in free space, and f is the antenna operating frequency. The low-frequency PIFA element 12 resonates at a frequency of 2.45 GHz, and the high-frequency PIFA element 13 resonates at a frequency of 5.5 GHz. The second ground coupling section forms a bent-up section 21 at its ground end. This bent-up section 21 forms a coupling current with the low-frequency PIFA element 12. This coupling current is used in parallel with the resonant current generated by the air radiation capacitor to effectively reduce the length of the low-frequency PIFA element 12. The low-profile multi-band antenna is made of metal materials, or it can be printed on a PCB.

[0034] Through a unique first dual-band antenna design, the low-frequency PIFA vibrator and the high-frequency PIFA vibrator resonate at 2.45GHz and 5.5GHz frequencies respectively, which can effectively cover the WIFI6 / WIFI6E / WIFI7 frequency bands and can be extended to other frequency points, meeting the needs of multiple wireless communication standards. This greatly improves the applicability and versatility of the antenna, allowing one antenna to play a role in different wireless application scenarios, reducing the device's dependence on multiple antennas, and contributing to the miniaturization of the device design.

[0035] By using the coupling capacitance C formed by the bent rising section 21 at the ground end of the second ground coupling section and the low-frequency PIFA vibrator 12, and the air equivalent radiation capacitance Cε, the shortening factor is obtained to reduce the length of the low-frequency PIFA vibrator. This design breaks through the limitation of the large size of traditional PIFA antennas in the low-frequency band. While achieving low-frequency resonance, it effectively reduces the overall profile of the antenna, making it easier to install and lay out in space-constrained equipment, and also contributing to the compactness and aesthetics of the equipment's appearance design.

[0036] The low-frequency PIFA vibrator generates open radiation by forming a specific waveguide coupling coefficient with the height difference between itself and the ground. The same applies to the high-frequency PIFA vibrator. This design ensures that the antenna has stable and efficient radiation characteristics in all operating frequency bands, effectively transmitting and receiving electromagnetic wave signals, reducing signal loss and interference during transmission, thereby improving the overall performance of the wireless communication system and ensuring the stability and high speed of data transmission.

[0037] Furthermore, antennas can be manufactured as standalone units using metal stamping, produced using metal materials, or printed onto the motherboard PCB and integrated with the overall circuitry PCB. Metal stamping facilitates large-scale production and optimized antenna performance; metal material production ensures structural strength and stability; and PCB printing significantly improves the portability and ease of use of the entire terminal device, reduces internal wiring complexity, minimizes signal transmission paths, further reduces signal loss and interference, and lowers production costs and timelines, facilitating rapid product updates and market expansion.

[0038] This low-profile multi-band antenna is also suitable for antenna notch filtering requirements at any frequency point. This enables the antenna to effectively suppress specific interference frequency signals in complex electromagnetic environments, enhance the antenna's selective reception and transmission capabilities for target signals, improve the reliability and anti-interference capabilities of the entire wireless communication system in environments with interference sources, ensure communication quality and data integrity, and provide strong support for the stable operation of equipment in various scenarios with high electromagnetic compatibility requirements.

[0039] In the above technical solution, the PIFA (Pilot-Inverted-F) antenna is a planar inverted-F antenna. It is an antenna structure widely used in wireless communication devices. Structurally, it is an antenna built on a plane, shaped like an inverted letter "F". When a signal is input to the radiating patch of the PIFA antenna through the feed point, a high-frequency current is generated on the radiating patch. According to the principle of electromagnetic induction, the high-frequency current generates a magnetic field around the radiating patch, which in turn induces an alternating electric field in space, thus forming an outward-radiated electromagnetic wave. Simultaneously, due to the presence of the short-circuit pin, it alters the current distribution of the antenna, enabling the antenna to resonate at a lower frequency band and effectively control the antenna's input impedance to match the output impedance of the RF circuit, reducing signal reflection and improving the antenna's radiation efficiency.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A low profile multi-band antenna, characterized by, The antenna comprises a first dual-frequency antenna, a second ground coupling section and an antenna grounding section (30) for providing a grounding current loop for the whole antenna, The first dual-frequency antenna has a signal feed-in point (11) arranged on the antenna grounding section (30) and two PIFA resonators which are arranged left and right along the signal feed-in point (11), the two PIFA resonators are a low-frequency PIFA resonator (12) and a high-frequency PIFA resonator (13) respectively, the low-frequency PIFA resonator (12) is arranged to the right of the signal feed-in point (11) and forms a specific waveguide coupling coefficient with the height difference from the ground to form open radiation, and the high-frequency PIFA resonator (13) is arranged to the left of the signal feed-in point (11) and forms a specific waveguide coupling coefficient with the height difference from the ground to form open radiation. The second ground coupling section forms a bending rising section (21) at the end of the ground, which forms a coupling capacitance C with the low-frequency PIFA resonator (12), the coupling capacitance C is arranged in parallel with the capacitive reactance Cε in the air equivalent radiation to obtain the shortening coefficient of the low-frequency PIFA resonator (12), so as to reduce the length of the low-frequency PIFA resonator (12).

2. A low profile multi-band antenna according to Claim 1, wherein, The low-frequency PIFA resonator (12) and the high-frequency PIFA resonator (13) are arranged to have lengths from the signal feed-in point (11) to the end of the respective resonator sections determined by the formula 0.2λ, λ=C / f, C is the speed of light in free space, and f is the operating frequency of the antenna, the low-frequency PIFA resonator (12) resonates at a frequency of 2.45 GHz, and the high-frequency PIFA resonator (13) resonates at a frequency of 5.5 GHz.

3. A low profile multi-band antenna according to Claim 1, wherein, The second ground coupling section forms a bending rising section (21) at the end of the ground, which forms a coupling current with the low-frequency PIFA resonator (12), and the coupling current is used in parallel with the resonant current generated by the air radiation capacitance to effectively reduce the length of the low-frequency PIFA resonator (12).

4. The low profile multiband antenna of claim 1, wherein, The low-profile multi-band antenna is made of metal materials, or the low-profile multi-band antenna is printed on the main board PCB. The low-profile multi-band antenna is made of metal materials, or the low-profile multi-band antenna is printed on the main board PCB.

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