TWI594498B - Multi-frequency monopole antenna for tablet and botebook computers - Google Patents

Description

Unipolar multi-band antenna for tablet and notebook computers

The invention relates to a monopole multi-band antenna applied to a tablet and a notebook computer, in particular to a monopole antenna which can meet the requirements of the frequency bands of LTE700, LTE2300 and LTE2500.

Today's multi-band methods use monopole antennas, which are often designed to increase their bend and float metal architecture to reduce their antenna size and increase the current path on the antenna to meet multi-band requirements. In addition, wafer inductors are used to reduce the length to achieve a compact design. There are also matching circuits used to achieve design requirements.

However, the technique of using the bending technique in the antenna technology can increase the current path, and can also achieve a miniaturized design, but the antenna gain and the radiation field type will have no small influence, and the radiation field type and gain of the antenna may be affected. The number of bends increases and the change is forced. In the aspect of the radiation pattern, a better omnidirectional radiation pattern may not be produced, and the gain side is The face reduces the gain. Using chip inductors to reduce the length and using matching circuits to achieve design increases cost and complexity.

With the advancement of the technology era, wireless communication has developed rapidly, its antenna size requirements have become smaller and smaller, and the overall architecture has become more and more simplified. However, in the prior art, in order to make the overall size of the antenna smaller, the radiation field of the antenna is Therefore, the gain is deteriorated, so that the antenna cannot be effectively applied to the antenna structure with a simple design. Therefore, the present invention proposes a simple structure, a good gain, and a radiation field type, and at the same time conforms to the rapidly developing multi-band antenna.

The antenna of the present invention is implemented by the following techniques:

A monopole multi-band antenna for a tablet and a notebook computer, comprising: a grounding portion, a radiating portion, a first grounding parasitic element and a second grounding parasitic element; the grounding portion, the radiating portion and the ground The first ground parasitic element is disposed on a first surface of a substrate, the second ground parasitic element is disposed on a second surface of the substrate, and the first surface is opposite to the second surface; the radiation a portion laterally adjacent to the first grounding parasitic element and located above the grounding portion and extending from the grounding portion; the radiating portion is based on an antenna feeding end and includes a first radiation coupling arm And a first radiation parasitic element; the first ground parasitic element includes a first parasitic element extending from the ground portion and a first arm, a second arm, a third arm, and a fourth extending parallel to each other on the first parasitic element The second ground parasitic element includes a second parasitic element coupling arm extending from the ground portion through the ground drilling portion and the second parasitic element coupling arm extending The first radiating arm, the second radiating arm and the ground connecting arm are extended, wherein the extending directions of the first radiating arm and the second radiating arm are parallel to each other.

The unipolar multi-band antenna applied to a flat panel or a notebook computer as described above, wherein the first radiation coupling arm extended by the radiation portion is disposed in parallel with the first radiation arm of the second ground parasitic element.

The unipolar multi-band antenna applied to a tablet or a notebook computer as described above, wherein the third arm and the fourth arm of the first grounded parasitic element are disposed in parallel with the second radiating arm 2 of the second grounded parasitic element.

The unipolar multi-band antenna applied to a tablet or a notebook computer as described above, wherein the antenna feed end is fed using a mini coaxial feed or a monopole antenna.

The unipolar multi-band antenna applied to a tablet or a notebook computer as described above, wherein the multi-band refers to a low frequency and a high frequency; the low frequency can transmit and receive a wireless network signal in a frequency range of 698 MHz to 787 MHz; It can send and receive wireless network signals in the frequency range of 2.305GHz~2.4GHz and 2.5GHz~2.69GHz.

The advantages of the antenna of the present invention are:

1. The present invention adopts a planar printed antenna, which is easy to manufacture and low in cost, and can be applied to a tablet or a notebook computer, and reduces interference with the GPS band.

2. The antenna of the present invention has a path of passive component characteristics, so that it is not necessary to apply any active or passive components to the antenna end, and excellent performance can still be achieved.

(1)‧‧‧ Grounding Department

(12)‧‧‧Grounding Drilling Department

(2) ‧‧‧Radiation Department

(21)‧‧‧ Antenna feed end

(22)‧‧‧First radiation coupling arm

(23)‧‧‧Second radiation coupling arm

(3) ‧‧‧First grounded parasitic elements

(31)‧‧‧First parasitic element

(32)‧‧‧First arm

(33) ‧‧‧second arm

(34) ‧‧‧ third arm

(35) ‧ ‧ fourth arm

(4) ‧‧‧Second grounded parasitic elements

(41)‧‧‧Second parasitic element coupling arm

(42)‧‧‧First Radiation Arm

(43) ‧‧‧second radiation arm

(44)‧‧‧Grounding arm

(5) ‧‧‧Substrate

(51)‧‧‧ first surface

(52) ‧‧‧second surface

(6)‧‧‧T-type structure

First diagram: (a) front view showing the architecture of the multi-band antenna of the present invention applied to a tablet or a notebook computer; (b) showing the back of the architecture of the multi-band antenna of the present invention applied to a tablet or a notebook computer schematic diagram

Second picture: graph of the implementation and simulated return loss ratio of the multi-band antenna of the present invention

Fig. 3 is a comparison diagram of the return loss of the width of the first radiation coupling arm of the multi-band antenna of the present invention

Fourth: impedance comparison diagram of the width of the first radiation coupling arm of the multi-band antenna of the present invention

Fig. 5 is a comparison diagram of the return loss of the second radiation coupling arm of the multi-band antenna of the present invention

Figure 6 is a comparison diagram of the return loss of the multi-band antenna of the present invention for the second and third arms of the first grounded parasitic element during shortening or erasing

Figure 7: Comparison of the return loss of the multi-band antenna of the present invention for lengthening the length of the first radiating arm

Figure 8: Comparison of the return loss of the multi-band antenna of the present invention for reducing the length of the second radiating arm

Ninth diagram: Schematic diagram of the multi-band antenna of the present invention applied to a MIMO antenna

Figure 10: Comparison of the S-parameters of the multi-band antenna of the present invention applied to the MIMO antenna

Figure 11: 3D simulation far-field radiation pattern of a multi-band antenna of the present invention applied to a MIMO antenna

Twelfth Diagram: Schematic diagram of another embodiment of the multi-band antenna of the present invention applied to a MIMO antenna

Figure 13: S-parameter comparison diagram of another embodiment of the multi-band antenna of the present invention applied to a MIMO antenna

Figure 14: 3D simulated far field radiation pattern of another embodiment of the multi-band antenna of the present invention applied to a MIMO antenna

For a more complete and clear disclosure of the technical content, the purpose of the invention and the effects thereof achieved by the present invention, it is explained in detail below, and please refer to the drawings and drawings:

Referring to the first figure, the unipolar multi-band antenna for a tablet and a notebook computer of the present invention comprises: a grounding portion (1), a radiating portion (2), and a first grounding parasitic element (3). And a second grounding parasitic element (4); wherein: the grounding portion (1), the radiating portion (2) and the first grounding parasitic element (3) are disposed on the first surface (51) of the substrate (5), Two grounded parasitic elements (4) On the second surface (52) of the substrate (5), the first surface (51) is opposite to the second surface (52); the radiating portion (2) is laterally adjacent to the first ground parasitic element (3) and is located at ground Above the portion (1), the radiation portion (2) and the first ground parasitic element (3) both extend from the ground portion (1); the radiation portion (2) is based on an antenna feeding end (21), and A first radiation coupling arm (22) and a second radiation coupling arm (23) are included; the first ground parasitic element (3) includes a first parasitic element (31) and a first parasitic element (31) extending from the ground portion (1) a first arm (32), a second arm (33), a third arm (34), and a fourth arm (35) extending upward; the second grounding parasitic element (4) includes a ground drill through the grounding portion (1) a second parasitic element coupling arm (41) extending from the hole portion (12) and a first radiating arm (42), a second radiating arm (43), and a ground connecting arm (44) extending on the second parasitic element coupling arm (41) ).

Preferably, the first radiation coupling arm (22) extended by the radiation portion (2) is disposed in parallel with the first radiation arm (42) of the second ground parasitic element (4).

Preferably, the third arm (34) and the fourth arm (35) of the first grounded parasitic element (3) are disposed in parallel with the second radiating arm (43) of the second grounded parasitic element (4).

Preferably, the antenna feed end (21) is fed using a mini coaxial feed or a monopole antenna.

Accordingly, the multi-band of the unipolar multi-band antenna applied to the tablet and the notebook computer of the present invention is a low frequency and a high frequency; the low frequency is used for transmitting and receiving a wireless network signal in a frequency range of 698 MHz to 787 MHz; The frequency is used to send and receive wireless network signals in the frequency range of 2.305GHz~2.4GHz and 2.5GHz~2.69GHz.

<Example>

The multi-band antenna of the present invention is fabricated on an FR4 glass fiber substrate having a thickness of 0.8 mm, a dielectric permittivity of 4.4, and a loss tangent of 0.0245, and the radiation portion of the multi-band antenna of the present invention is used. (2) The area occupied is 70 × 8 mm ² , and the size of the grounding portion (1) is 267 × 205 mm ² .

Next, a simulation test was performed on the multi-channel antenna of the present invention produced in accordance with the above specifications. The second figure is a graph of the implementation and analog return loss ratio of the multi-band antenna applied to the monopole antenna of the invention. The second graph shows that the measured results of the multi-band antenna of the present invention are consistent with LTE700, LTE2300 and LTE2500. The bandwidth requirement of the frequency band, and the measured results are quite close to the simulation results in the modal performance.

The third figure is a comparison diagram of the return loss of the width of the first radiation coupling arm of the multi-band antenna of the present invention. As can be seen from the third figure, when the first radiation coupling arm (22) is reduced, the bandwidth is gradually narrowed. Although the match is good, the bandwidth of the LTE700 (698MHz-787MHz) cannot be included in the bandwidth.

The fourth figure is an impedance comparison diagram of the width of the first radiation coupling arm of the multi-band antenna of the present invention. It can be clearly seen from the fourth figure that as the first radiation coupling arm (22) is shortened, the imaginary parts of the first and second modes of the low frequency are gradually increased, that is, the inductance is gradually increased. The first radiation coupling arm (22) affects the coupling amount of the first and second modes and controls the reactance value of the impedance.

The fifth figure is a comparison diagram of the return loss of the second radiation coupling arm of the multi-band antenna of the present invention. As can be seen from the fifth figure, after deleting the second radiation coupling arm (23), it can be seen that the first mode in the analog part of the LTE 700 has the first mode matching deterioration after the second radiation coupling arm (23) is deleted. And slightly moving to the high frequency, resulting in narrow bandwidth can not fully cover the LTE700 band.

The sixth figure is a comparison diagram of the return loss of the multi-band antenna of the present invention for the second and third arms of the first grounded parasitic element when shortening or deleting. It can be clearly seen in the sixth figure that the second arm (33) and the third arm (34) of the first grounded parasitic element (3) gradually move toward the high frequency at the 1.47 GHz mode when the first arm (33) and the third arm (34) are gradually shortened to delete. The design of the arms of the second arm (33) and the third arm (34) is mainly to allow the high-order mode at 1.47 GHz to avoid the frequency band of the GPS.

The seventh figure is a comparison diagram of the return loss of the length of the first radiating arm (42) of the second grounded parasitic element (4) of the multi-band antenna of the present invention. It can be seen from the seventh figure that the first mode of the LTE 700 increases the resonant frequency with the path length and also moves to the low frequency. This path resonates out of the first mode of LTE 700.

The eighth figure reduces the length of the second radiating arm (43) of the second grounded parasitic element (4), and it can be clearly seen that the second mode of the LTE 700 gradually moves toward the high frequency, and slightly affects the first mode. Match.

Please refer to the ninth figure for the architecture diagram of the multi-band antenna of the present invention applied to a multiple input multiple output (MIMO) antenna. The original design of the multi-band antenna of the present invention is placed in a face-to-face manner and is configured in a 2X2 MIMO antenna with a spacing of 8 mm between the two antennas. The simulation results of the configuration of the multiple-input multiple-output (MIMO) antenna can be seen from the tenth figure. Although this type of configuration is selected, although the matching of the first mode of the low frequency is poor, the isolation is the least affected configuration. From the simulation results of the far-field radiation field of Fig. 11, it can be seen that before the T-type structure is added, the simulated far-field radiation field results are more messy and more zero-point.

The twelfth figure is a simulation result of improving the original multiple input multiple output (MIMO) antenna, and a T-shaped structure (6) is placed in the center of the front side of the antenna. Among them, TL was 11 mm and TW was 7.5 mm.

The thirteenth picture shows the result of adding the T-shaped structure (6), which effectively improves the direction of the ground current and affects the isolation between the two antennas, so that the low-frequency isolation is lower than -10dB, affecting the matching of low frequencies. This simulation result fully covers the three bands of LTE.

From the results of the simulated far-field radiation pattern of Figure 14, it can be seen that the antenna design of the twelfth figure can obtain full-effect radiation, and is more suitable for use in a tablet or notebook computer.

The above is only a part of the embodiments of the present invention, and is not intended to limit the present invention. It is intended to be included in the scope of the present invention.

In summary, the embodiments of the present invention can achieve the expected use efficiency, and the specific technical means disclosed therein have not been seen in similar products, nor have they been disclosed before the application, and have completely complied with the patent law. The regulations and requirements, the application for invention patents in accordance with the law, and the application for review, and the grant of patents, are truly sensible.

(1)‧‧‧ Grounding Department

(12)‧‧‧Grounding Drilling Department

(2) ‧‧‧Radiation Department

(21)‧‧‧ Antenna feed end

(22)‧‧‧First radiation coupling arm

(23)‧‧‧Second radiation coupling arm

(3) ‧‧‧First grounded parasitic elements

(31)‧‧‧First parasitic element

(32)‧‧‧First arm

(33) ‧‧‧second arm

(34) ‧‧‧ third arm

(35) ‧ ‧ fourth arm

(4) ‧‧‧Second grounded parasitic elements

(41)‧‧‧Second parasitic element coupling arm

(42)‧‧‧First Radiation Arm

(43) ‧‧‧second radiation arm

(44)‧‧‧Grounding arm

(5) ‧‧‧Substrate

(51)‧‧‧ first surface

(52) ‧‧‧second surface

Claims (5)

A monopole multi-band antenna for a tablet and a notebook computer, comprising: a grounding portion, a radiating portion, a first grounding parasitic element and a second grounding parasitic element; the grounding portion, the radiating portion and the ground The first ground parasitic element is disposed on a first surface of a substrate, the second ground parasitic element is disposed on a second surface of the substrate, and the first surface is opposite to the second surface; the radiation a portion laterally adjacent to the first grounding parasitic element and located above the grounding portion and extending from the grounding portion; the radiating portion is based on an antenna feeding end and includes a first radiation coupling arm And a first radiation parasitic element; the first ground parasitic element includes a first parasitic element extending from the ground portion and a first arm, a second arm, a third arm, and a fourth extending parallel to each other on the first parasitic element The second grounding parasitic element includes a second parasitic element coupling arm extending from the ground portion through the ground drilling portion and a first radiation arm and a second radiation arm extending on the second parasitic element coupling arm, Ground connection Wherein the first extension arm and a second radiating direction of the radiating arm parallel lines. The unipolar multi-band antenna for a tablet or a notebook computer according to the first aspect of the invention, wherein the first radiation coupling arm extended by the radiation portion and the second ground parasitic element A radiating arm is arranged in parallel. The unipolar multi-band antenna for a tablet or a notebook computer according to claim 1 or 2, wherein the third arm and the fourth arm and the second ground parasitic element of the first ground parasitic element are The second radiating arms are arranged in parallel. The unipolar multi-band antenna for a tablet or a notebook computer according to claim 3, wherein the antenna feed end is fed using a mini coaxial feed or a monopole antenna. The unipolar multi-band antenna for a tablet or a notebook computer according to claim 4, wherein the multi-band refers to a low frequency and a high frequency; and the low frequency is used for transmitting and receiving a wireless band in a frequency range of 698 MHz to 787 MHz. The network signal; the high frequency can send and receive wireless network signals in the frequency range of 2.305 GHz to 2.4 GHz and 2.5 GHz to 2.69 GHz.