Miniaturized double-frequency wide-beam terminal antenna

Abstract

The utility model discloses a miniaturized double-frequency wide-beam terminal antenna, which relates to the technical field of mobile terminal antennas and comprises an antenna cap, an antenna housing, a radiator assembly, a feed network module, a radio frequency connector and an antenna base, and the radiator assembly, the feed network module and the radio frequency connector are sequentially distributed inside the antenna housing from top to bottom. According to the miniaturized double-frequency wide-beam terminal antenna, the radiation copper strip is arranged in a gradually-changed spiral form, and when the radiation copper strip is at the same rising angle, the spiral arm with the top open circuit structure has a wider beam width than the spiral arm with the short circuit structure, so that low-elevation electromagnetic signal radiation and reception of the satellite antenna are facilitated; the radiation copper strip is provided with four feeding points, each feeding point is connected with two oscillator arms with different lengths, the circular polarization characteristic and the double-frequency radiation characteristic of the antenna are guaranteed, the two oscillator arms with the same feeding guarantee different rising angles and widths, the isolation degree of double-frequency radiation is improved, the shape of a directional diagram is more regular, and higher radiation gain is achieved.

Description

Technical Field

[0001] This utility model relates to the field of mobile terminal antenna technology, specifically a miniaturized dual-band wide-beam terminal antenna. Background Technology

[0002] With technological advancements and the demands of daily life, satellite positioning, communication, and navigation technologies are widely used and play an increasingly fundamental role. Because satellites are far away, the signals transmitted to terminals are weak. To accurately capture satellite signals, antennas are required to have a wide beamwidth, a low radiation elevation angle, and dual-frequency operation. This characteristic is particularly important in my country's satellite navigation system, where the number of satellites is relatively small.

[0003] Helical antennas possess excellent directional radiation and circular polarization characteristics, making them widely used in satellite terminal equipment. Considering conformal integration with terminal equipment, a small physical size is often required for the antenna. Traditional single-band helical antennas have narrow bandwidths and high heights. Furthermore, in dual-band designs, poor isolation leads to pattern distortion and a significant drop in gain. Additionally, wide-beam designs result in increased back lobes, negatively impacting antenna radiation performance. Therefore, designing a small-sized helical antenna with a dual-band wide-beam configuration is crucial. This application proposes a miniaturized dual-band wide-beam terminal antenna to address these issues. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a miniaturized dual-band wide-beam terminal antenna, solving the technical problems mentioned in the background.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a miniaturized dual-band wide-beam terminal antenna, including an antenna cap, an antenna radome, a radiator assembly, a feed network module, an RF connector, and an antenna base. The radiator assembly, the feed network module, and the RF connector are arranged sequentially from top to bottom inside the antenna radome, and the antenna base is connected to the bottom of the antenna radome by a thread. The RF connector passes through the antenna base. The radiator assembly is composed of a radiating copper strip and a printed circuit board, and the radiating copper strip is attached to the surface of the printed circuit board.

[0008] Preferably, the radiating copper strip is attached to the surface of the printed circuit board in a gradually spiraling form, with the upper end of the radiating copper strip being open-circuited. At the same rise angle, the spiral arm with the open-circuit structure at the top of the radiating copper strip has a wider beamwidth than the spiral arm with the short-circuit structure, which is more conducive to the low elevation angle electromagnetic signal radiation and reception of the satellite antenna.

[0009] Preferably, the radiating copper strip is generally in the form of a four-arm structure with four feed points. At each feed point, the vibrating arm is further divided into two arms at a certain interval. The length of the newly divided vibrating arm is 3 / 4 of the corresponding operating wavelength (the lower the frequency, the longer the electrical length required, and the longer the corresponding vibrating arm). That is, the radiating copper strip has a total of four feed points, and each feed point is connected to two vibrating arms of unequal length, thereby ensuring the circular polarization characteristics and dual-frequency radiation characteristics of the antenna.

[0010] Preferably, the two oscillator arms at the same feed point are attached to the surface of the printed circuit board with different rise angles and widths, which improves the isolation of dual-frequency radiation, makes the radiation pattern more regular, and has higher radiation gain.

[0011] Preferably, the four feed points at the bottom of the radiator assembly are fixed with equal arc lengths on the circumference of the cylindrical bottom surface of the printed circuit board, and the four feed points are inserted into the corresponding slots of the feed network module.

[0012] Preferably, the antenna cap is inserted inside the radiator assembly and connected to the radome.

[0013] (III) Beneficial Effects

[0014] The beneficial effects of this utility model are as follows:

[0015] This miniaturized dual-frequency wide-beam terminal antenna features a radiating copper strip arranged in a gradually tapered spiral. At the same rise angle, the open-ended spiral arm at the top provides a wider beamwidth compared to the short-circuited spiral arm, which is more conducive to low-elevation electromagnetic signal radiation and reception by the satellite navigation antenna. The radiating copper strip has four feed points, each connected to two unequal-length dipole arms, ensuring the antenna's circular polarization and dual-frequency radiation characteristics. Furthermore, the two dipole arms fed by the same power source maintain different rise angles and beamwidths, improving the isolation of the dual-frequency radiation, resulting in a more regular radiation pattern and higher radiation gain. Therefore, this application not only achieves coverage of dual-frequency communication bands but also possesses high radiation gain and a wide beamwidth, enabling effective signal reception and transmission when used with satellite navigation equipment. It also features lightweight and small size. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall disassembled structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the radiator assembly structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the combined structure of this utility model.

[0019] In the diagram: 1. Antenna cap, 2. Antenna cover, 3. Radiator assembly, 4. Feed network module, 5. RF connector, 6. Antenna base. Detailed Implementation

[0020] 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.

[0021] like Figure 1-3 As shown, this utility model provides a technical solution: a miniaturized dual-band wide-beam terminal antenna, including an antenna cap 1, an antenna radome 2, a radiator assembly 3, a feed network module 4, an RF connector 5, and an antenna base 6. The radiator assembly 3, the feed network module 4, and the RF connector 5 are arranged sequentially from top to bottom inside the antenna radome 2. The antenna cap 1 is inserted into the radiator assembly 3 and connected to the antenna radome 2. The antenna base 6 is connected to the bottom of the antenna radome 2 by a thread. The RF connector 5 passes through the antenna base 6, and the external thread of the RF connector 5 is connected and fixed to the internal thread of the antenna base 6. The radiator assembly 3 consists of a radiating copper strip 31 and a printed circuit board 32. The radiating copper strip 31 is attached to the surface of the printed circuit board 32 in a gradually changing spiral shape. The upper end of the radiating copper strip 31 is open-circuited. At the same rise angle, the spiral arm of the open-circuited structure at the top of the radiating copper strip 31 is relatively short. The spiral arm of the circuit structure has a wider beamwidth, which is more conducive to the low elevation angle electromagnetic signal radiation and reception of the satellite antenna. The radiating copper strip 31 is generally in the form of a four-arm structure with four feed points. At each feed point, the vibrating arm is divided into two arms at a certain interval. The length of the newly divided vibrating arm is 3 / 4 of the corresponding operating wavelength (the lower the frequency, the longer the electrical length required, and the longer the corresponding vibrating arm). That is, the radiating copper strip has a total of four feed points. Each feed point is connected to two vibrating arms of unequal length, which ensures the circular polarization characteristics and dual-frequency radiation characteristics of the antenna. The two vibrating arms of the same feed are attached to the surface of the printed circuit board 32 with different rise angles and widths, which improves the isolation of dual-frequency radiation, makes the radiation pattern more regular, and has higher radiation gain. The four feed points at the bottom of the radiating body assembly 3 are fixed to the circumference of the cylindrical bottom surface of the printed circuit board 32 with equal arc lengths, and the four feed points are inserted into the corresponding slots of the feed network module 4.

[0022] For the feed network module 4, in order to make the antenna have circular polarization radiation characteristics, the four dipole arms of the radiator assembly 3 need to be fed with equal amplitude and sequentially 90° out of phase. The feed network module 4 contains a power divider function that splits the single input electrical signal into four dipole arms with equal amplitude and in phase. At the same time, the phase shifting network of the feed network gives the adjacent dipole arms a phase difference of 90° sequentially. Meanwhile, by adjusting the width and length of the microstrip line in the feed network module 4, the imaginary part of the final RF input port of the antenna is made close to 0 and the imaginary part is close to 50Ω, which is impedance matched with the 50Ω RF connector 5.

[0023] The radiator assembly 3, the feed network module 4, and the RF connector 5 are combined and operate at a frequency of XGHz to YGHz. They can receive and transmit electromagnetic signals in a circular polarization manner. The radiator assembly 3, the feed network 4, and the RF connector 5 are placed inside the radome 2 and the antenna base 6, which ensures the overall structural strength of the antenna. The antenna cap 1 is inserted into the radiator assembly 3 and connected to the radome 2. On the one hand, the radiator assembly is dielectric-loaded, reducing the actual length of the radiator. On the other hand, it ensures the concentricity of the radiator assembly 3 and the radome 2, avoiding pattern distortion caused by the tilt of the vibrator arm.

[0024] The operational steps for this application are as follows:

[0025] The antenna base 6 is installed with the RF connector 5. The RF connector 5 is passed through the reserved hole in the antenna base 6 and fixed by connecting the external thread of the RF connector 5 to the internal thread of the antenna base 6. The four feed points of the radiator assembly 3 are inserted into the corresponding slots of the feed network module 4. In the feed network module 4, the input signal is equally distributed to the four dipole arms through a 1-to-4 power divider, and a 90° phase difference is introduced to adjacent dipole arms through a microstrip phase-shifting network to achieve circular polarization radiation characteristics. The microstrip phase-shifting network in the feed network module 4 is adjusted. The width and length of the line make the imaginary part of the impedance of the RF input port approach 0 and the real part approach 50Ω, achieving impedance matching with the RF connector 5. The radiator assembly 3, the feed network module 4, and the RF connector 5 are installed into the radome 2 from top to bottom. The antenna base 6 is fastened to the bottom of the radome 2 by threads. The antenna cap 1 is inserted into the radiator assembly 3 and connected to the top of the radome 2 to complete the dielectric loading. At the same time, the concentricity of the radiator assembly 3 and the radome 2 is ensured to avoid pattern distortion caused by the tilt of the vibrator arm.

[0026] In the description of this utility model, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] In this utility model, unless otherwise explicitly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components or an interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A miniaturized dual-band wide-beam terminal antenna, characterized by: The antenna comprises an antenna cap (1), an antenna cover (2), a radiator assembly (3), a feed network module (4), a radio frequency connector (5) and an antenna base (6), the radiator assembly (3), the feed network module (4) and the radio frequency connector (5) are sequentially arranged inside the antenna cover (2) from top to bottom, the antenna base (6) is connected with the bottom end of the antenna cover (2) through screwing, the radio frequency connector (5) penetrates through the antenna base (6), the radiator assembly (3) is composed of a radiating copper band (31) and a printed board (32), and the radiating copper band (31) is attached to the surface of the printed board (32).

2. The compact dual-band wide-beam terminal antenna according to claim 1, characterized in that: The radiating copper band (31) is attached to the surface of the printed board (32) in the form of a gradually changing spiral, and the upper end of the radiating copper band (31) is open.

3. The compact dual-band wide-beam terminal antenna according to claim 1, wherein: The radiating copper band (31) is in the form of four arms and has four feed points, each of the feed points is divided into two at a certain interval, and the length of the newly divided vibrator arm is 3 / 4 of the corresponding working wavelength.

4. The compact dual-band wide-beam terminal antenna according to claim 3, characterized in that: The two vibrator arms of the same feed point are attached to the surface of the printed board (32) at different rising angles and widths.

5. The compact dual-band wide-beam terminal antenna according to claim 4, characterized in that: The four feed points at the bottom end of the radiator assembly (3) are fixed on the circumference of the cylindrical bottom surface of the printed board (32) at equal arc lengths, and the four feed points are inserted into the corresponding clamping grooves of the feed network module (4).

6. The compact dual-band wide-beam terminal antenna according to claim 1, wherein: The antenna cap (1) is inserted into the inside of the radiator assembly (3) and connected with the antenna cover (2).

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