Mobile phone metal frame antenna with wide beam realized by high order mode

Abstract

The application discloses a mobile phone metal frame antenna adopting high-order mode to realize a wide beam, which comprises a dielectric plate arranged on the inner side of the mobile phone metal frame, the upper surface of the dielectric plate is provided with a feed line structure, and a power divider for realizing power average distribution with a phase difference of 180 degrees; the lower surface of the dielectric plate is provided with a metal ground, a first slot is loaded near the first end on the length direction of the metal frame, a second slot is loaded near the first end on the width direction of the metal frame, and the directions of the first slot and the second slot are perpendicular. The application reduces the influence on the right side by loading the first slot on the upper and lower sides; the radiation of the metal frame to the upper and lower directions is reduced by loading the grounding points on the upper and lower sides; the co-current is compressed by the bending structure of the metal frame; the co-current is further compressed by the first end of the metal frame; and finally, the effect of wide half-power beam width is realized by compressing the co-current.

Description

Technical Field

[0001] This invention relates to the field of mobile phone antenna technology, and in particular to a mobile phone metal frame antenna that uses a high-order mode to achieve a wide beam, specifically a wide beam mobile phone frame antenna for the S-band (3-3.3GHz) satellite communication frequency band. Background Technology

[0002] In smartphone design, the requirements of satellite communication functionality place higher demands on the beamwidth and gain of antenna radiation. However, existing mobile phone antennas cannot meet these requirements, especially antennas constructed with the phone's metal frame, which fail to satisfy users' requirements for beamwidth and gain. Therefore, it is necessary to propose a novel antenna. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings and defects of the prior art and provide a wide-beam mobile phone metal frame antenna that uses higher-order modes, specifically a wide-beam mobile phone frame antenna that uses only the metal frame as the radiator. The higher-order mode current of the antenna is controlled by slot loading: compressing the unidirectional current and using only the mobile phone metal frame as the radiator, thereby realizing a wide-beam mobile phone metal frame antenna.

[0004] A mobile phone metal frame antenna employing high-order modes to achieve a wide beam includes a dielectric substrate disposed inside the mobile phone metal frame. A feed structure is arranged on the upper surface of the dielectric substrate to realize a power divider with an average power distribution phase difference of 180°. A metal ground is disposed on the lower surface of the dielectric substrate. A first slot is loaded near the first end on both sides of the metal frame along its length, and a second slot is loaded near the first end in the width direction of the metal frame. The directions of the first and second slots are perpendicular. An SMA (Surface Mount Multi-Actuation) feeding method is used, employing a center-fed approach to excite a dipole antenna to generate radiation.

[0005] In this feed structure, both the feed line and the metal ground are gold-plated copper foil.

[0006] The thickness of the gold-plated copper foil is 0.018 mm.

[0007] The thickness of the metal frame of the mobile phone is 1mm.

[0008] The distance between the metal frame of the mobile phone and the dielectric plate is 1mm.

[0009] The dielectric substrate is made of F4B material with a thickness of 3mm and a relative permittivity of 2.2.

[0010] The dielectric substrate has a length of 147 mm and a width of 73 mm.

[0011] The first gap is connected to the second gap, forming a U-shaped gap structure.

[0012] The side of the mobile phone metal frame corresponding to the first and second gap metal frames has multiple spacer gaps.

[0013] A grounding point is arranged inside the first gap.

[0014] This invention reduces the impact on the right side by adding first gaps on the top and bottom sides; reduces the radiation of the metal frame in both directions by adding grounding points on the top and bottom sides; compresses the same-direction current by the bending structure of the metal frame; and further compresses the same-direction current by opening a second gap at the first end of the metal frame. Finally, it achieves the effect of wide half-power beamwidth by compressing the same-direction current.

[0015] The feed line and metal ground of the antenna of the present invention can be implemented by printing. After certain simulation optimization, it can achieve coverage of 3.1-3.3GHz, and a half-power beamwidth of more than 130° can be achieved in both the xoy plane and yoz plane within the frequency band. Attached Figure Description

[0016] Figure 1 This is a top view schematic diagram of the mobile phone metal frame antenna that uses higher-order modes to achieve a wide beam according to the present invention.

[0017] Figure 2 This is a side view schematic diagram of a mobile phone metal frame antenna that uses a higher-order mode to achieve a wide beam, according to the present invention.

[0018] Figures 3 to 4 This is a return loss diagram of antenna simulation and testing according to an embodiment of the present invention.

[0019] Figures 5 to 10 The following are, in sequence, the radiation patterns of the antenna in the embodiment of the present invention at 3.1 GHz xoy plane, 3.1 GHz yoz plane, 3.2 GHz xoz plane, 3.2 GHz yoz plane, 3.3 GHz xoz plane, and 3.3 GHz yoz plane. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0021] As one of the simplest basic units of omnidirectional antennas, the dipole antenna is widely used. Since the construction of many antenna models is equivalent to that of a dipole antenna, the antenna in this embodiment of the invention controls the current of the higher-order modes of the antenna by loading gaps, thereby achieving a wide beam effect using only the metal frame of the mobile phone as the radiator.

[0022] Figure 1 This invention relates to a wide-beam mobile phone frame antenna that uses only a metal frame as the radiator. A dielectric substrate is arranged inside the mobile phone metal frame. A feed line structure is arranged on the upper surface of the single-layer dielectric substrate and connected to the mobile phone metal frame to realize a power divider with an average power distribution phase difference of 180°. The lower surface of the single-layer dielectric substrate is a metal ground. Energy is fed to the feed line of the feed line structure through SMA, and then the feed line excites the higher-order modes of the mobile phone metal frame. The mobile phone metal frame with many gaps at the first end (such as the left side) is used as the radiator. The antenna's half-power beamwidth is enhanced by suppressing the unidirectional current of the higher-order modes of the antenna or enhancing the reverse current. The current compression is achieved by the bending of the mobile phone metal frame itself and the loading of the gaps.

[0023] In some embodiments, the dielectric substrate is made of F4B material with a thickness of 3 mm and a relative permittivity of 2.2. In some embodiments, both the feed line and the ground plane are 0.018 mm copper plated.

[0024] Preferably, the thickness of the mobile phone metal frame is 1mm, and the part of the mobile phone metal frame that needs to be radiated is separated from the outer peripheral surface of the dielectric plate. Preferably, the distance between the mobile phone metal frame and the dielectric plate is 1mm.

[0025] In this invention, the mobile phone metal frame is only separated at the left side where there is a gap. This separation is achieved by cutting away the shape of the dielectric substrate, leaving air between the dielectric substrate and the mobile phone metal frame. A metal feed line then connects to the mobile phone metal frame, enabling the left side of the mobile phone metal frame to operate. The right side of the mobile phone metal frame is connected to the dielectric substrate and does not require radiation. Therefore, the right side of the mobile phone metal frame is connected to the metal ground while also being connected to the dielectric substrate, resulting in a very small current and virtually no radiation.

[0026] In some embodiments, the first gap and the second gap are connected to form a U-shaped gap structure.

[0027] In some embodiments, the sides of the mobile phone metal frame corresponding to the first and second gap metal frames have multiple spacer gaps.

[0028] In some embodiments, a grounding point is arranged in the first gap to connect the metal ground to the aforementioned side metal frame. By loading grounding points on the upper and lower sides, the current can be reduced, thereby reducing the radiation of the mobile phone metal frame in the upper and lower directions.

[0029] like Figure 1 As shown, mobile phone metal frame antennas suffer from upward and downward radiation and excessive current at undesirable metal frame locations. Therefore, this invention reduces antenna radiation to both ends and decreases the current on the right side by adding grounding points on the top and bottom sides and opening a first gap. Furthermore, by adjusting the position of the second gap on the left side of the metal frame, a mode similar to a cubic mode non-uniform compressed dipole is excited on the left side, achieving a stable wide half-power beamwidth within the frequency band.

[0030] In some embodiments, the dielectric substrate is 147 mm long and 73 mm wide, and the specific antenna dimensions are determined by HFSS simulation.

[0031] In some embodiments, the wide-beam mobile phone frame antenna of the present invention uses only the mobile phone metal frame as the radiator and adopts a center-fed method for feeding. Preferably, the antenna uses an SMA feeding method to excite a dipole antenna to generate radiation. A differential feeding method is used to realize a single-feed antenna through a feeding network, thereby solving the problem that the required modes cannot be excited due to the thickness of the mobile phone metal frame when using single-port feeding. In the present invention, the feeding network includes a microstrip line with two U-shaped bends arranged on a dielectric substrate. The right end is directly connected to an SMA connector, and energy is fed to the widest microstrip line on the right end through the SMA connector (this width corresponds to the 50-ohm input impedance of the SMA connector). Different microstrip line widths correspond to different impedances, which can play a matching role. The two U-shaped bends are used to achieve a 180° phase difference, providing phase compensation. The upper and lower ends are connected to the mobile phone metal frame, feeding energy to the metal frame so that the metal frame acts as an antenna for radiation. The U-shaped bends are preferably formed by vertical bends.

[0032] Figures 3 to 4 This is a return loss diagram of antenna simulation and testing according to an embodiment of the present invention.

[0033] Figures 5 to 9 The antenna radiation patterns in the xoy and yoz planes at 3.1 GHz, 3.2 GHz, and 3.3 GHz are shown. After fabrication and testing, the antenna achieved a half-power beamwidth of more than 130° in both the xoy and yoz planes at 3.1-3.3 GHz, and the gain was greater than -1 dBi.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention.

[0035] Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the 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 the equivalents of the claims be included within the invention.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A mobile phone metal frame antenna that achieves wide beamwidth using higher-order modes, characterized in that, The device includes a dielectric substrate disposed inside the metal frame of the mobile phone. A feeder structure is arranged on the upper surface of the dielectric substrate to achieve a power divider with an average power distribution phase difference of 180°. The feed network includes microstrip lines with two U-shaped bends disposed on the dielectric substrate, one end of which is directly connected to an SMA connector. A metal ground is disposed on the lower surface of the dielectric substrate. A first gap is applied near the first end on both sides of the metal frame along its length, and a second gap is applied near the first end in the width direction of the metal frame. The directions of the first and second gaps are perpendicular, and the first and second gaps are connected to form a U-shaped gap structure. A grounding point is arranged within the gap, connecting the metal ground to the side of the phone's metal frame corresponding to the first gap, reducing the radiation of the phone's metal frame in both vertical and horizontal directions. The sides of the phone's metal frame corresponding to the first and second gaps have multiple spacer gaps. An SMA feeding method is used, employing a center-fed approach to excite the dipole antenna to generate radiation. Higher-order modes of the phone's metal frame are excited through the feed line. The phone's metal frame acts as a radiator, and the antenna's half-power beamwidth is enhanced by suppressing the unidirectional current of higher-order modes or increasing the reverse current. Current compression is achieved by utilizing the bending of the phone's metal frame itself and the loading of the gaps.

2. The mobile phone metal frame antenna using higher-order modes to achieve a wide beam as described in claim 1, characterized in that, Both the feed line and the metal ground of the feed line structure are gold-plated copper foil.

3. The mobile phone metal frame antenna using higher-order modes to achieve a wide beam as described in claim 2, characterized in that, The thickness of the gold-plated copper foil is 0.018 mm.

4. The mobile phone metal frame antenna using higher-order modes to achieve a wide beam as described in claim 1, characterized in that, The thickness of the metal frame of the mobile phone is 1mm.

5. The mobile phone metal frame antenna using higher-order modes to achieve a wide beam as described in claim 1, characterized in that, The radiating portion of the mobile phone's metal frame is separated from the outer peripheral surface of the dielectric substrate, and the distance between the mobile phone's metal frame and the dielectric substrate is 1mm.

6. The mobile phone metal frame antenna using higher-order modes to achieve a wide beam as described in claim 1, characterized in that, The dielectric substrate is made of F4B material with a thickness of 3mm and a relative permittivity of 2.

2.

7. The mobile phone metal frame antenna using higher-order modes to achieve a wide beam as described in claim 1, characterized in that, The dielectric substrate has a length of 147 mm and a width of 73 mm.

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