CN106972238B - A planar multi-system integrated antenna for mobile terminals - Google Patents

Abstract

The invention discloses a planar multisystem integrated antenna for a mobile terminal, which consists of a first self-networking antenna (2), a second self-networking antenna (3), a floor (6) which are printed on the front surface of a medium substrate (1), a satellite communication antenna (4), a navigation antenna (5) and a spacer (7) which are printed on the back surface of the medium substrate (1). The invention can be used in microwave millimeter wave communication systems, especially in planarized mobile terminal devices. The multi-frequency multi-system integrated flat surface system has the advantages of multi-frequency multi-system integration, flat surface, light weight, low cost and quick processing period, and is suitable for the system.

Description

A planar multi-system integrated antenna for mobile terminals

technical field

The invention belongs to the technical field of microwave and millimeter wave passive devices, in particular to a multi-frequency and multi-mode planar integrated antenna in microwave and millimeter wave passive devices.

Background technique

With the rapid development of modern communication systems, the functions of mobile terminals are becoming more and more complex, and the electrical performance requirements are getting higher and higher. At the same time, they are also developing in the direction of planarization, miniaturization, light weight, and low cost. This development trend is formed to meet the commercial requirements of microwave and millimeter wave circuits. The planar multi-system integrated antenna is a kind of planar, multi-frequency, multi-mode, and low-cost integrated antenna suitable for mobile terminal equipment produced under this situation. While meeting the requirements of mobile terminal equipment for multi-frequency and multi-mode, the planar integrated antenna greatly improves the cost and space waste caused by multiple antennas in traditional terminal equipment.

Generally, broadband antennas or multiple antennas are used to meet the requirements of different modes of terminal equipment. If multiple antennas can be integrated together, the space occupied by the antenna can be greatly saved, and the development of miniaturization and light weight of terminal equipment can also be promoted. Some mobile terminals now propose that they can realize ad hoc networks while possessing satellite navigation and satellite communication functions. In the traditional design, the ad hoc network antenna is implemented with a rod-shaped monopole, and the satellite navigation and communication are implemented with a four-arm helical structure. The three antennas are individually packaged, occupying a large space, which is not conducive to the miniaturization and weight reduction of terminal equipment. On the other hand, the isolation between the antennas is also inconvenient by improving the isolation between the antennas in the design of the antennas. The traditional design method has high processing costs, large volume, heavy weight, and is not easy to integrate, so it is in urgent need of improvement.

Contents of the invention

The purpose of the present invention is to propose a planar multi-system integrated antenna for mobile terminals, which overcomes the shortcomings of existing terminal multi-antennas that are heavy in weight, large in volume, high in processing cost and difficult to integrate.

The technical solution of the present invention is: a planar multi-system integrated antenna for a mobile terminal, characterized in that an ad hoc network antenna one, ad hoc network antenna two, floor printed on the front of the medium substrate, a satellite communication antenna printed on the back of the medium substrate, a navigation antenna and an isolation bar form a multi-band planar integrated antenna; the satellite communication antenna is located on the front and back of the ad hoc network antenna one, and the navigation antenna is located on the front and back of the ad hoc antenna two; Antenna 2 is parallel; the floor is in the same plane as antenna 1 of the ad hoc network and antenna 2 of the ad hoc network, and the floor is in a different plane from the satellite communication antenna, navigation antenna and isolation strip.

Further, the ad hoc network antenna 1 is composed of a main radiation part 1, a series inductor 1, and a feed port 1, and the ad hoc network antenna 2 is composed of a main radiation part 2, a series inductor 2, and a feed port 2, and the main radiation part 1 and the main radiation part 2 are T-shaped structures.

Further, the satellite communication antenna includes feed port 3, parasitic oscillator 1, and parasitic metal strips loaded on the first horizontal excitation oscillator, and the shapes of the first horizontal excitation oscillator, parasitic oscillator 1, and the parasitic metal strip can be changed according to the shape of the required pattern.

Further, the navigation antenna includes feed port 4 loaded on the second horizontal excitation dipole and the second parasitic dipole, and the shapes of the second horizontal excitation dipole and the second parasitic dipole can be changed according to the shape of the required pattern.

Further, the isolation strip is composed of a printed metal strip and three inductors.

Further, the floor includes a long metal strip etched with two rectangular slits, and a left branch and a right branch symmetrically located at two ends of the long metal strip.

Advantages and beneficial effects of the present invention:

(1) Compared with traditional independent multiple antennas, the present invention has the advantage of compact structure. Compared with the traditional three-dimensional structure, under the condition that the antenna can work normally in various modes, by integrating and printing the antennas of different modes on a dielectric board, the integration degree is higher, the weight is lighter, the cost is lower, and the processing cycle is shorter;

(2) Since the planar integrated antenna of the present invention realizes multi-mode operation by using different antennas printed on the same dielectric board, a decoupling part can be added on the dielectric board without additionally increasing the size of the antenna, thereby improving the isolation between the antennas and improving the performance of the antenna when the multi-mode works simultaneously.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the present invention is further described: as shown in Figure 1, a kind of planar multi-system integrated antenna for mobile terminal, it is characterized in that ad hoc network antenna one 2, ad hoc network antenna two 3, floor 6, printed on the medium substrate 1 backside of medium substrate 1 front side ad hoc antenna 4, navigation antenna 5 and spacer strip 7 form multi-band planar integrated antenna as shown in Figure 1; Said satellite communication antenna 4 is positioned at the front and back side of ad hoc network antenna one 2, and said navigation antenna 5 is positioned at the front and back side of ad hoc network antenna two 3; On the axis of symmetry of antenna one 2 and ad hoc network antenna two 3, and parallel with ad hoc network antenna one 2 and ad hoc network antenna two 3; said floor 6 is coplanar with ad hoc network antenna one 2 and ad hoc network antenna two 3, and said floor 6 is different from satellite communication antenna 4, navigation antenna 5 and spacer strip 7.

Further, the ad hoc network antenna 1 2 is composed of a main radiation part 1 21, a series inductor 22, and a feed port 1 23, and the ad hoc network antenna 2 3 is composed of a main radiation part 2 31, a series inductor 2 32, and a feed port 2 33, and the main radiation part 1 21 and the main radiation part 2 31 are both T-shaped structures.

Further, the satellite communication antenna 4 includes a feeding port three 44, a parasitic vibrator 1 and a parasitic metal strip 43 loaded on the horizontal excitation vibrator 1 42, and the shapes of the horizontal excitation vibrator 1 42, the parasitic vibrator 1 41 and the parasitic metal strip 43 can be changed according to the shape of the required pattern.

Further, the navigation antenna 5 includes a feed port 4 53 loaded on the second horizontal excitation dipole 51 and a second parasitic dipole 52 , the shapes of the second horizontal excitation dipole 51 and the second parasitic dipole 52 can be changed according to the shape of the required pattern.

Further, the isolation strip 7 is composed of a printed metal strip 71 and three inductors 72 .

Further, the floor 6 includes a long metal strip 61 etched with two rectangular slits, and a left branch 62 and a right branch 63 symmetrically located at two ends of the long metal strip 61 .

The principle of the technical solution of the present invention is: the ad hoc antenna 2 is a monopole antenna, and realizes good broadband matching by loading the series inductance 22 and the left branch 62 generated on the floor. The bottom floor 6 provides a reflective floor for the antenna, so that the monopole antenna still has a horizontal omnidirectional radiation pattern. Ad hoc network antenna two 3 are exactly the same as ad hoc network antenna one 2 . Since the distance between the ad hoc antenna 1 2 and the ad hoc antenna 2 3 is relatively close, the coupling between them is relatively large, adjusting the length of the printed metal strip 71 and the values of the three loaded inductors 72 can adjust the isolation between the two ad hoc networks. The navigation antenna 5 is a horizontally polarized dipole, which intersects with the second and third polarizations of the ad hoc antenna, and there is a high degree of isolation between them. Due to the reflection of the floor 6, the dipole becomes unidirectional radiation, which can cover the entire upper half space. By adjusting the length, width and distance between the horizontal excitation dipole 2 51 and the parasitic dipole 2 52, the antenna can realize broadband radiation and simultaneously cover several frequency bands of satellite navigation. Due to the use of linear polarization to receive circular polarization, the gain of the antenna should be reduced by 3dB. By designing the antenna gain reasonably, it can still ensure that the antenna can effectively receive satellite signals and realize high-precision navigation. The satellite communication antenna 4 is likewise a horizontally polarized dipole. Cross-polarized with the ad hoc antenna - 2, even if it is placed on the back of the ad hoc antenna, there is a high degree of isolation between the two. Due to the reflection of the parasitic metal strip 43 and the floor 6, the satellite communication antenna 4 has the function of unidirectional radiation and can cover the entire upper half space. By adjusting the size and spacing of the first parasitic oscillator 41 , the first horizontal excitation oscillator 42 and the parasitic metal strip 43 , the antenna can work in a wider frequency band. Similarly, by adjusting the antenna gain reasonably, after subtracting 3dB of polarization loss, the antenna can still realize the normal satellite communication function.

In order to further illustrate the feasibility of the above-mentioned technical solution, a specific design example is given below, a planar multi-system integrated antenna for mobile terminals. The designed ad hoc antenna works at 400MHz to 678MHz. The four frequency bands of the navigation antenna are 1268MHz±10.23MHz, 1561MHz±2.04MHz, 1575MHz±1.02MHz, 1602MHz±4MHz, and the working frequency bands of the satellite communication antenna are 1995MHz±15MHz and 2185MHz. ±15MHz. The dielectric substrate uses an FR4 substrate with a thickness of 0.8mm and a dielectric constant of 4.5. The size of the entire dielectric substrate 1 is: 218.5mm × 133.5mm × 0.8mm, the height of the floor 6 is 40mm, the lengths of the left branch 62 and the right branch 63 symmetrically located at the two ends of the long metal strip 61 are both 20mm; The single arm length of two 51 is 45mm, the single arm length of parasitic vibrator two 52 is 39mm; The test results show that the standing wave of the ad hoc antenna is less than 3 in the 310MHz-740MHz frequency band, the maximum gain range is 2.5dB-3.38dB, and the full-band isolation between the two ad hoc networks is greater than 12dB. The frequency band of the navigation antenna is 1190MHz~1690MHz, the standing wave is less than 2, and the gain is -4dB~2dB within the angle range of ±70°. The working frequency band of the satellite communication antenna is 1870MHz~2240MHz, the standing wave is less than 2, and the gain is 0dB~2.2dB within the angle range of ±60°.

Those skilled in the art will appreciate that the embodiments described here are to help readers understand the principles of the present invention, and it should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the technical revelations disclosed in the present invention without departing from the present invention, and these modifications and combinations are still within the protection scope of the present invention.

Claims (3)

1. A planar multi-system integrated antenna for mobile terminals, characterized in that ad hoc antennas one (2), ad hoc antennas two (3), floor (6) printed on the dielectric substrate (1) front, satellite communication antennas (4), navigation antennas (5) and spacers (7) printed on the dielectric substrate (1) backside form a multi-band planar integrated antenna; The spacer (7) is positioned on the axis of symmetry of the self-organizing network antenna one (2) and the self-organizing network antenna two (3), and is parallel to the self-organizing network antenna one (2) and the self-organizing network antenna two (3); the floor (6) is coplanar with the self-organizing network antenna one (2) and the self-organizing network antenna two (3), and the floor (6) is different from the satellite communication antenna (4), the navigation antenna (5) and the spacer strip (7); The self-organizing network antenna one (2) is composed of a main radiation part one (21), a series inductor one (22), and a feed port one (23). The self-organizing network antenna two (3) is composed of a main radiation part two (31), a series inductor two (32), and a feed port two (33). The main radiation part one (21) and the main radiation part two (31) are both T-shaped structures; The satellite communication antenna (4) includes a feed port three (44), a parasitic oscillator one (41) and a parasitic metal strip (43) loaded on the horizontal excitation oscillator one (42), and the horizontal excitation oscillator one (42), the parasitic oscillator one (41) and the parasitic metal strip (43) are all rectangular metal strips; The navigation antenna (5) includes a feed port four (53) and a second parasitic oscillator (52) loaded on the second horizontal excitation oscillator (51). Both the second horizontal excitation oscillator (51) and the second parasitic oscillator (52) are rectangular metal strips. 2. The planar multi-system integrated antenna for mobile terminals according to claim 1, characterized in that: the spacer strip (7) is composed of a printed metal strip (71) and three inductors (72). 3. The planar multi-system integrated antenna for mobile terminals according to claim 1, characterized in that: the floor (6) includes a long metal strip (61) etched with two rectangular slits and a left branch (62) and a right branch (63) symmetrically located at both ends of the long metal strip (61).