TW201947816A - Antenna device - Google Patents

Abstract

An antenna device includes a ground plate, a first and a second feed element and a radiator including a radiating plate and four radiating elements. Four sides of the radiating plate are respectively connected to a first side of the first radiating element, a first side of the second radiating element, a first side of the third radiating element and a first side of the fourth radiating element. A second side of the third radiating element and a second side of the fourth radiating element are connected to the ground plate. The first and the second feed elements are connected to a second side of the first radiating element and a second side of the second radiating element and configured to send and receive a first and a second signals in the same frequency band respectively. Two sides of the antenna device are mirror-symmetrical to a mirror symmetry line.

Description

   Antenna device   

The present disclosure relates to an antenna device, and more particularly to a dual-feed antenna device.

With the development of technology, the demand for wireless signal transmission is increasing day by day. The structural design of the antenna has a significant impact on wireless signal transmission.

Therefore, how to reduce the size of the antenna and increase the transmission speed, while maintaining good isolation, is an important issue in the field.

One aspect of the present disclosure relates to an antenna device including a ground plate, a radiator, a first feeding element, and a second feeding element. The radiator includes a radiation plane, a first radiation element, a second radiation element, a third radiation element, and a fourth radiation element. The first side, the second side, the third side, and the fourth side of the radiation plane are respectively connected to the first side of the first radiating element, the first side of the second radiating element, and the first side and the fourth radiating element of the third radiating element. The first side of the element. The second side of the third radiating element and the second side of the fourth radiating element are connected to the ground plate. The first feeding element is connected to the second side of the first radiating element, and is used for transmitting and receiving the first signal. The second feeding element is connected to the second side of the second radiating element, and is used for transmitting and receiving a second signal in the same frequency band as the first signal. The structures on both sides of the antenna device are mirror-symmetrical to the mirror-symmetric line.

Therefore, according to the technical aspect of this case, the embodiment of this case uses an antenna device to use one antenna radiator to achieve the receiving and transmitting capabilities of two antennas in the same frequency band.

100‧‧‧ Antenna Device

120‧‧‧ ground plate

140‧‧‧ radiator

141‧‧‧first radiating element

142‧‧‧Second radiating element

143‧‧‧third radiating element

144‧‧‧Fourth radiating element

141a ~ 144a‧‧‧First side

141b ~ 144b‧‧‧Second side

141c ~ 144c‧‧‧Third side

141d ~ 144d‧‧‧ Fourth side

150‧‧‧ radiation plane

151‧‧‧first side

152‧‧‧second side

153‧‧‧third side

154‧‧‧Fourth side

155‧‧‧first filtering structure

156‧‧‧Second filtering structure

161‧‧‧First feed element

162‧‧‧second feed element

L‧‧‧Mirror symmetry line

D1, D2, D3‧‧‧ length

W‧‧‧Width

θ‧‧‧ angle

X, Y, Z‧‧‧ directions

P1, P2‧‧‧feed points

C0, C1, C2‧‧‧Capacitors

L1, L2‧‧‧ Inductance

200‧‧‧ equivalent circuit diagram

300, 400‧‧‧ Experimental data chart

500‧‧‧planar field map

FIG. 1 is a schematic perspective view of an antenna device according to some embodiments of the present disclosure.

FIG. 2 is an equivalent circuit diagram of an antenna device according to some embodiments of the present disclosure.

FIG. 3 is an experimental data diagram of an antenna device according to some embodiments of the present disclosure.

FIG. 4 is a diagram of experimental data of another antenna device according to some embodiments of the present disclosure.

FIG. 5 is a plan field diagram of an antenna device according to some embodiments of the present disclosure.

In order to make the description of the present invention more detailed and complete, reference may be made to the accompanying drawings and various embodiments described below. On the other hand, well-known elements and steps are not described in the embodiments, so as to avoid unnecessary restrictions on the content of the present invention.

Regarding the "coupling" or "connection" used in the following various embodiments, it can mean that two or more elements are in direct physical contact or electrical contact with each other, or they are indirectly making physical or electrical contact with each other. , It can also mean that two or more elements act on each other.

In this article, unless the article specifically restricts the article, "a" and "the" can refer to a single or multiple. It will be further understood that the terms "including", "including", "having" and similar words used in this document indicate the features, regions, integers, steps, operations, elements and / or components recorded therein, but do not exclude It describes or additionally one or more of its other features, regions, integers, steps, operations, elements, components, and / or groups thereof.

Please refer to Figure 1. FIG. 1 is a schematic perspective view of an antenna device 100 according to some embodiments of the present disclosure. As shown in FIG. 1, in some embodiments, the antenna device 100 includes a ground plate 120, a radiator 140, a first feeding element 161, and a second feeding element 162. The radiator 140 includes a first radiating element 141, a second radiating element 142, a third radiating element 143, a fourth radiating element 144, and a radiation plane 150.

In operation, the first feeding element 161 passes through the radiator 140 to receive and transmit the first signal S1. Similarly, the second feeding element 162 transmits the second signal S2 in the same frequency band as the first signal S1 through the radiator 140.

Structurally, the first side 151, the second side 152, the third side 153, and the fourth side 154 of the radiation plane 150 are respectively connected to the first side 141a of the first radiating element 141 and the first side 142a of the second radiating element 142, The first side 143a of the third radiating element 143 and the first side 144a of the fourth radiating element 144. The second side 143b of the third radiating element 143 and the second side 144b of the fourth radiating element 144 are respectively connected to the ground plate 120 as ground points. The first feeding element 161 is connected to the second side 141b of the first radiating element 141 opposite to the first side 141a, and serves as a feeding point of the first signal S1. The second feeding element 162 is connected to a second side 142b of the second radiating element 142 opposite to the first side, and serves as a feeding point of the second signal S2.

The structures on both sides of the antenna device 100 are mirror-symmetrical to the mirror symmetry line L. In other words, the first radiating element 141 and the second radiating element 142 are mirror-symmetrical to each other, and the third radiating element 143 and the fourth radiating element 144 are mirror-symmetrical to each other.

Specifically, as shown in FIG. 1, the ground plate 120 is parallel to the XY plane, and the radiation plane 150 is also parallel to the XY plane. The first radiating element 141 and the fourth radiating element 144 are parallel to the YZ plane, and the second radiating element 142 and the third radiating element 143 are parallel to the XZ plane. The mirror symmetry line L is parallel to the angle bisector of the angle between the X axis and the Y axis on the XY plane.

Furthermore, the first side 151 of the radiation plane 150 is connected to the first side 141a of the first radiation element 141 in parallel to the Y axis. The second side 152 of the radiation plane 150 is connected to the first side 142a of the second radiating element 142 in parallel to the X-axis. The third side 153 of the radiation plane 150 is connected to the first side 143 a of the third radiation element 143 in parallel to the X axis. The fourth side 154 of the radiation plane 150 is connected to the first side 144 a of the fourth radiating element 144 in parallel to the Y axis.

In other words, the first radiating element 141, the second radiating element 142, the third radiating element 143, and the fourth radiating element 144 are vertically disposed on the radiation plane 150, respectively.

In addition, the second side 143b of the third radiating element 143 with respect to the first side 143a is connected to the ground plate 120 in parallel to the X-axis to serve as a ground point of the first signal S1. The second side 144b of the fourth radiating element 144 with respect to the first side 144a is connected to the ground plate 120 in parallel to the Y-axis to serve as a ground point of the second signal S2. It is worth noting that the two places where the radiator 140 and the ground plate 120 are connected have a width W, and the width W is greater than zero and shorter than the lengths of the second sides 143b and 144b of the third radiating element 143 and the fourth radiating element 144. .

In some embodiments, the first radiating element 141 and the second radiating element 142 are respectively trapezoidal. The first side 141a and the opposite second side 141b of the first radiating element 141 are parallel to each other, and the length of the first side 141a is greater than the length of the second side 141b. The third side 141c of the first radiating element 141 is perpendicular to the first side 141a and the second side 141b. The fourth side 141d and the third side 141c of the first radiating element 141 have an included angle θ, where the included angle θ is greater than zero.

In other words, the first radiating element 141 is a rectangular trapezoid, the first side 141a is a trapezoidal lower bottom, the second side 141b is a trapezoidal upper bottom, the third side 141c is a trapezoidal height, and the fourth side 141d is a trapezoidal hypotenuse. . For example, the length of the first side 141a is approximately 13.5 mm, the length of the third side 141c is approximately 7.6 mm, and the length of the fourth side 141d is approximately 8 mm. The second radiating element 142 is all equal to the first radiating element 141, and the same content is not repeated here.

In some embodiments, the third radiating element 143 and the fourth radiating element 144 are L-shaped, respectively. Specifically, as shown in FIG. 1, the first side 143a of the third radiating element 143 is approximately 14.5 mm, the third side 143c of the third radiating element 143 is approximately 10 mm, and the fourth side of the third radiating element 143 is approximately 143d is about 9.4 mm. The fourth radiating element 144 is all equal to the third radiating element 143, and the same content is not repeated here.

In other embodiments, the radiation plane 150 of the radiator 140 further includes a first filtering structure 155. As shown in FIG. 1, the first filtering structure 155 is located between the first side 151 and the second side 152 of the radiation plane 150, and is a rectangular hole, and the first filtering structure 155 is mirror-symmetrical to the mirror symmetry line L. Specifically, the long side of the rectangular hole is parallel to the mirror symmetry line L. In some embodiments, the long side of the rectangular hole is about 5.05 mm, and the short side of the rectangular hole is about 4 mm.

In other embodiments, the radiation plane 150 of the radiator 140 further includes a second filtering structure 156. As shown in FIG. 1, the second filtering structure 156 is located between the third side 153 and the fourth side 154 of the radiation plane 150 and is a rectangular hole, and the second filtering structure 156 is mirror-symmetrical to the mirror symmetry line L. Specifically, the long side of the rectangular hole is parallel to the mirror symmetry line L. In some embodiments, the long side of the rectangular hole is about 10 mm, and the short side of the rectangular hole is about 5.05 mm.

It is worth noting that the above length values are merely examples for convenience of explanation, and are not intended to limit the case. Those skilled in the art can set the length according to actual needs. In some embodiments, the long and short sides of the first filtering structure 155 are different from the long and short sides of the second filtering structure 156. In other words, in some embodiments, the areas of the first filtering structure 155 and the second filtering structure 156 are different, but this case is not limited thereto. In other embodiments, the shapes of the first filtering structure 155 and the second filtering structure 156 may be completely the same.

In some embodiments, the distance between the first feeding element 161 and the third side 141c of the first radiating element 141 is a first length D1. The third side 141c of the first radiating element 141 has a second length D2. The first side 143a of the third radiating element 143 has a third length D3. The sum of the first length D1, the second length D2, and the third length D3 is a quarter of the wavelength of the first signal S1. In other words, the current path from the feeding point to the ground point is a quarter of the wavelength of the first signal S1.

Please refer to Figures 1 and 2 together. FIG. 2 is an equivalent circuit diagram 200 of an antenna device 100 according to some embodiments of the present disclosure. The first inductor L1 and the first capacitor C1 in Figure 2 determine the operating frequency f _O1 of the antenna from the first feed point P1, as shown in the following formula:

The first inductor L1 and the first capacitor C1 are formed by the first side 141a of the first radiating element 141, the third side 141c of the first radiating element 141, and the fourth side 141d of the first radiating element 141 in the first figure. The dimensions of the third side 143c of the third radiating element 143 and the fourth side 143d of the third radiating element 143 are determined.

Similarly, the second inductor L2 and the second capacitor C2 in Figure 2 determine the operating frequency f _O2 of the antenna from the second feed point P2, as shown in the following formula:

Since the antenna device 100 has a mirror-symmetrical structure on both sides, the second inductor L2 and the second capacitor C2 are equivalent to the first inductor L1 and the first capacitor C1, and are both determined by the same element size, and will not be repeated here.

In addition, the first inductor L1, the second inductor L2, and the capacitor C0 in FIG. 2 determine the operating frequency -f _{f of the} filtering structure between the first feeding point P1 and the second feeding point P2, as shown in the following formula:

The first inductor L1, the second inductor L2, and the capacitor C0 are determined by the length and width of the first filter structure 155 and the length and width of the second filter structure 156 in the first figure.

In this way, by calculating the electrical length required for different operating frequencies, designing an appropriate size so that the phase difference of the current generated by each feed point on the structure conforms to 90 degrees or 180 degrees to achieve good isolation.

Please refer to Figure 3. FIG. 3 is a graph 300 of experimental data of frequency-isolation S12 of an antenna device 100 according to some embodiments of the present disclosure. It can be known from the experimental data graph 300 that the isolation between two antennas sharing a radiator 140 is less than 20 dB.

Please refer to Figure 4. FIG. 4 is an experimental data diagram 400 of frequency-reflection losses S11 and S22 of an antenna device 100 according to some embodiments of the present disclosure. It can be known from the experimental data graph 400 that the antenna device 100 has the smallest reflection losses S11 and S22 when the frequency is 5.5 GHz.

Please refer to Figure 5. FIG. 5 is a planar field diagram 500 of an antenna device 100 on the XZ plane, the YZ plane, and the XY plane according to some embodiments of the present disclosure. It can be known from the planar field diagram 500 that the antenna efficiency is about 65% and the antenna gain is about 4.5 dBi.

In summary, the embodiment of the present case uses an antenna device, and particularly relates to a dual-feed single-band antenna device, which achieves the transmitting and receiving capability of two antennas in the same frequency band through one radiator, so as to reduce the antenna size and Good isolation.

Although the present disclosure has been disclosed as above by way of implementation, it is not intended to limit the present disclosure. Persons with ordinary knowledge in the technical field can make various changes and decorations without departing from the spirit and scope of the present disclosure. The scope of protection of the disclosure shall be determined by the scope of the attached patent application.

Claims (10)

    An antenna device includes: a ground plate; a radiator including a radiation plane, a first radiation element, a second radiation element, a third radiation element, and a fourth radiation element, a first of the radiation plane A side, a second side, a third side, and a fourth side are respectively connected to a first side of the first radiating element, a first side of the second radiating element, and a first side of the third radiating element. And a first side of the fourth radiating element, a second side of the third radiating element with respect to the first side, and a second side of the fourth radiating element with respect to the first side are connected to the ground plate; A first feeding element is connected to a second side of the first radiating element opposite to the first side for receiving and transmitting a first signal; and a second feeding element is connected to the second radiating element. A second side of the first side is used to transmit and receive a second signal in the same frequency band as the first signal, and the structures on both sides of the antenna device are mirror-symmetrical to a mirror-symmetric line.         The antenna device according to claim 1, wherein a distance between the first feeding element and a third side of the first radiating element is a first length, and the third side of the first radiating element has A second length, the first side of the third radiating element has a third length, and the sum of the first length, the second length, and the third length is a quarter of the wavelength of the first signal.         The antenna device according to claim 1, wherein the radiation plane further includes a first filtering structure, the first filtering structure is located between the first side and the second side of the radiation plane, wherein the first filtering structure The mirror image is symmetrical to the mirror symmetry line.         The antenna device according to claim 3, wherein the first filtering structure is a rectangular hole, and a long side of the rectangular hole is parallel to the mirror symmetry line.         The antenna device according to claim 3, wherein the radiation plane further includes a second filtering structure, the second filtering structure is located between the third side and the fourth side of the radiation plane, wherein the second filtering structure The mirror image is symmetrical to the mirror symmetry line.         The antenna device according to claim 5, wherein the second filter is a rectangular hole, and a long side of the rectangular hole is parallel to the mirror symmetry line.         The antenna device according to claim 5, wherein the areas of the first filtering structure and the second filtering structure are different.         The antenna device according to claim 1, wherein the first radiating element, the second radiating element, the third radiating element, and the fourth radiating element are respectively disposed vertically on the radiation plane.         The antenna device according to claim 1, wherein the first radiating element and the second radiating element are trapezoidal, the first side and the second side of the first radiating element are parallel to each other, and the first side The length is greater than the length of the second side, a third side of the first radiating element is perpendicular to the first side and the second side, and a fourth side of the first radiating element and the third side have An angle.         The antenna device according to claim 1, wherein the third radiating element and the fourth radiating element are L-shaped, respectively.