TWM626654U - Structure of antenna - Google Patents

Abstract

An antenna structure is provided and including a substrate, a first radiating part and a second radiating part. The first radiating portion is disposed on a left side above the substrate, and includes a first feeding point connected to a wiring on a surface of the substrate, and a first grounding point located next to the first feeding point and connected to an edge of a metal on surface of the substrate. The second radiating portion is disposed on the substrate and located to on a right side of the first radiating portion, and includes a second feeding point connected to the wiring on the surface of the substrate, and a second grounding point located next to the second feeding point and connected to the edge of the metal on surface of the substrate. A length and width of the second radiating portion are different from a length and width of the first radiating portion, and the second radiating portion and the first radiating portion are spaced apart from each other.

Description

Antenna structure

This work is about an antenna structure, especially about a high isolation multiple transmit multiple receive (MIMO) inverted-F antenna structure (Planar inverted-F antenna, PIFA).

The existing multi-transmit and multi-receive antenna is a two-plane inverted-F antenna that provides radio frequency radiation function, but it is limited to a limited radiation bandwidth. The bandwidth is not wide enough, so that different materials and complex environments will cause resonance to the Q value of the antenna. offset. For example, when using a subwoofer or surround sound in a home theater, the frequency offset will directly affect the user's transmission distance or cause sound interruptions. In addition, under the condition of coexistence of two antennas, isolation and bandwidth should be taken into consideration. In the prior art, the resonant frequency of the antenna may be affected by the material of plastic or wood, thereby affecting the isolation.

Therefore, it is necessary to develop a multi-transmit and multi-receive antenna with low cost, which can provide high isolation, high gain, and large frequency bandwidth, and whose antenna field polarization is close to circular.

In order to achieve the above purpose of the invention, the present invention proposes an antenna structure, which includes a substrate, a first radiating portion and a second radiating portion. The first radiating portion is disposed on the left side above the substrate, and includes a first feeding point connected to the surface layer traces of the substrate, and a first feeding point beside the first feeding point and connected to the edge of the surface metal of the substrate first ground point. The second radiating portion is disposed above the substrate and located to the right of the first radiating portion, and includes a second feeding point connected to the surface layer traces of the substrate, and a second feeding point located beside the second feeding point and connected to the A second ground point on the edge of the surface metal of the substrate. The length and width of the second radiating portion are different from the length and width of the first radiating portion, and the second radiating portion and the first radiating portion are spaced apart from each other.

According to an embodiment of the present invention, the length of the metal between the first feeding point and the first ground point is not equal to the length of the metal outside the first feeding point.

According to an embodiment of the present invention, the length of the metal between the second feed point and the second ground point is not equal to the length of the metal outside the second feed point.

According to an embodiment of the present invention, the length and width of the first radiating portion and the second radiating portion can be increased or decreased within an adjustment range, so that the resonance frequencies are correspondingly changed.

The beneficial effects of the present invention are that high isolation, high gain, and large bandwidth can be provided, so that a longer transmission distance can be provided in the same transmit power.

The technical solutions of the present creation will be clearly and completely described below with reference to the embodiments.

Referring to FIG. 1 , the present invention proposes an antenna structure 1 , which includes a substrate 10 , a first radiating portion 12 and a second radiating portion 11 . The first radiating portion 12 is disposed on the left side above the substrate 10 , and includes a first feeding point 120 connected to the surface layer traces of the substrate 10 , and a first feeding point 120 located beside the first feeding point 120 and connected to the substrate 10 . A first ground point 121 on the edge of the surface metal. The second radiating portion 11 is disposed above the substrate 10 and located to the right of the first radiating portion 12 , and includes a second feeding point 110 connected to the surface layer traces of the substrate 10 , and is located at the second feeding point 110 . A second ground point 111 beside the point 110 and connected to the edge of the surface metal of the substrate 10 . The first radiating portion 12 and the second radiating portion 11 are both disposed on the substrate 10 with four layers of dielectrics, and all metal portions (not shown) are connected with through holes except for the wiring portion.

Please refer to FIG. 2 and FIG. 3 , the metal length between the first feed point 120 and the first ground point 121 is not equal to the metal length outside the first feed point 120 , and the second feed point 110 The metal length between the second ground point 111 and the metal length outside the second feed point 110 is not equal to the length, and the length and width of the second radiating portion 11 are both the length and width of the first radiating portion 12 different. There is an interval between the second radiation portion 11 and the first radiation portion 12 , which is the width W6 in FIG. 3 .

Preferably, the length, width and interval of each part in the figure are as follows: L1=4.5mm, L2=6.5mm, L3=3.5mm, L4=2.8mm, L5=3.7mm, L6=31mm, L7=40mm, L8=7mm, W1=4.8mm, W2=2mm, W3=2.5mm, W4=9.8mm, W5=1.5mm, W6=2.5mm, W7=3mm, W8=10.1mm, W9=3.6mm, W10=1mm , W11=2.5mm, W12=30mm, W13=28mm, W14=1.5mm, D1=0.5mm, D2=6.8mm, D3=3mm, D4=1mm, D5=19.8mm, D6=1mm. In addition, the above-mentioned length W4 can be extended to 11mm, W8 can be extended to 12mm, and W12, L1, W5, L2, L3, W7, D3, W9, L4 and other parts can increase or decrease the size within the adjustment range of 2mm, according to the antenna With different shapes and sizes, the resonance frequency will also change accordingly.

Referring to FIGS. 4 to 7 , in this embodiment, the first radiation portion 12 is a 1/4λ wavelength antenna port-1, and the second radiation portion 11 is a 1/4λ wavelength antenna port-2. Figure 4 shows the S-parameter of the antenna. It is designed for the frequency band higher than 5GHz, so that it can reach the 5GHz frequency band when assembled on different casings. It is known that the antenna is assembled in complex casings with different materials, which will cause the antenna frequency to decrease. Therefore, the frequency needs to be adjusted by adjusting the length (curves S11, S22, S21). The isolation of the curves S11 and S21 in Figure 6 is maintained below -15dB, so that the efficiency in the frequency band 5GHz~6.5GHz is above 50%, and the power of the two antennas is used as much as possible. In Figure 7, the antenna radiation gains corresponding to the curves S11 and S21 in the frequency band 5GHz~6.4GHz are all above 3 dB.

FIG. 5 shows two-dimensional field patterns of the antenna structure of the present embodiment on the XY plane, the XZ plane, and the YZ plane at frequencies of 5.12 GHz (dotted line), 5.52 GHz (dotted line), and 6.02 GHz (solid line) Schematic.

The high-isolation and high-gain multi-transmitting and multi-receiving antenna of this creation is an asymmetric 1/4λ wavelength antenna, that is, the first radiating part 12 (1/4λ wavelength antenna port-1) and the second radiating part 11 (1 /4λ wavelength antenna port-2). In modern wireless communication, planar inverted-F antennas are often used to reduce the volume. This creation has two asymmetrical 1/4λ wavelength antennas with matched impedance and opposite directions for beamforming to achieve the purpose of multiple transmission and multiple reception.

The effect of this creation can provide a larger radiation coverage. Based on the same power, two multi-transmit and multi-receive planar inverted-F antennas are designed and fabricated on a common 4-layer dielectric substrate. On the wireless module with fewer external antennas, to improve the isolation and high gain of the two antennas, two independent radiating parts can be used for multi-transmit and multi-receive antennas with beamforming, and the reflection is lower than -10dB in the frequency band 5.5~7 GHz , isolation between -15dB to -22dB, radiation efficiency higher than 55%, gain between 2.6dB to 5dB, suitable for a variety of situations, can provide high isolation, high gain, large bandwidth, so that in the same transmit power It provides a longer transmission distance, large bandwidth and high isolation, so that users are not easily affected by structural materials in complex environments. For users with multiple homes, high-gain antennas and circular polarization can also increase the transmission signal. Coverage.

The described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments in this creation, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this creation.

1: Antenna structure 10: Substrate 11: The second radiation part 12: The first radiation department 110: Second feed point 111: Second ground point 120: First feed point 121: The first grounding point L1~L8: length W1~W14: Width D1~D6: Distance

1 and 2 are schematic diagrams of an antenna structure according to an embodiment of the present invention; 3 is a partial schematic diagram of the antenna structure of FIGS. 1 and 2; FIG. 4 , FIG. 6 , and FIG. 7 are gain-frequency curves of the radiation efficiency of the antenna structure according to an embodiment of the present invention; and 5 is a schematic diagram of two-dimensional field patterns of an antenna structure on an XY plane, an XZ plane, and a YZ plane at different frequencies according to an embodiment of the present invention.

1: Antenna structure

10: Substrate

11: The second radiation part

12: The first radiation department

110: Second feed point

111: Second ground point

120: First feed point

121: The first grounding point

Claims (4)

An antenna structure comprising: a substrate; A first radiating portion, disposed on the left side above the substrate, includes: a first feeding point, connected to the surface traces of the substrate; and a first ground point, located next to the first feed point, connected to the edge of the surface metal of the substrate; and A second radiating portion, disposed above the substrate and located to the right of the first radiating portion, includes: a second feed point, connected to the surface traces of the substrate; and a second ground point, located beside the second feed point, connected to the edge of the surface metal of the substrate; Wherein, the length and width of the second radiating portion are different from the length and width of the first radiating portion, and the second radiating portion and the first radiating portion are separated by an interval. The antenna structure of claim 1, wherein the length of the metal between the first feeding point and the first ground point is not equal to the length of the metal outside the first feeding point. The antenna structure of claim 1, wherein the length of the metal between the second feeding point and the second ground point is not equal to the length of the metal outside the second feeding point. The antenna structure according to any one of claims 1 to 3, wherein the length and width of the first radiating portion and the second radiating portion can be increased or decreased within an adjustment range, so that the resonance frequencies are correspondingly changed.

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