TWI601332B - Antenna device and antenna thereof - Google Patents

Description

Antenna device and its antenna

The present invention relates to an antenna, and more particularly to an antenna device and an antenna for a circuit board having a thickness of 1.4 to 1.6 mm.

There are many factors to consider when designing the antenna for antenna radiation, such as marginal effect, equivalent length, resonant frequency and equivalent width. For example, the Fringing Effect is used because the length and width of the planar antenna are limited. The length, therefore, the metal edge of the panel antenna will form a marginal field phenomenon, this phenomenon is called the marginal effect, and the marginal effect will eventually affect the resonant frequency of the panel antenna.

The marginal effect of the electric field makes the electrical length and width of the planar antenna larger than the length and width of the actual planar antenna. The electric field is affected by the antenna width, the thickness of the board, and the dielectric constant of the board. If the ratio of the antenna width to the board thickness is much less than 1, the effect of the marginal effect is reduced.

In considering the marginal effect factors, antennas of the same pattern applied to boards with a thickness of less than 1 mm and applied to boards with a thickness of 1.4 mm or more produce different results. Specifically, for an antenna designed to have a thickness of 1 mm or less, the antenna (the antenna size is fixed, that is, the antenna width is fixed) is directly transferred to a board having a thickness of 1.4 mm or more, and the board is subjected to a marginal effect factor. The thickness and the dielectric constant of the board have changed. Therefore, switching to an antenna with a thickness of 1.4 mm will not achieve antenna efficiency on a 1 mm board, and even the resonant frequency will shift, eventually The switched antenna cannot be applied.

In view of the above-mentioned deficiencies, it is an object of the present invention to provide an antenna device and an antenna thereof to uniformize the radiation current to improve antenna efficiency.

To achieve the above object, the present invention provides an antenna including a primary radiation body. The main radiator includes a right angle bend and an extension. The extension extends from the inner side of the right angle bend and the pattern of the extension is a right triangle. The two right-angled sides of the extension are connected to the inner side of the right-angled bent portion. Thus, the present invention allows the radiation current to be evenly distributed by the arrangement of the extensions.

Still another object of the present invention is to provide an antenna device and an antenna thereof for adapting an antenna to a circuit board having a thickness of 1.4 to 1.8 mm.

To achieve the above object, the present invention also provides an antenna device including a circuit board and an antenna. The circuit board has a top surface and a bottom surface. The thickness between the top surface and the bottom surface is between 1.4 and 1.8 mm. The antenna system is formed on the top surface of the circuit board and includes a main radiator. The main radiator includes a right angle bend and an extension. The extension extends from the inner side of the right angle bend and the pattern of the extension is a right triangle. The two right-angled sides of the extension are connected to the inner side of the straight bend.

The detailed construction, features, assembly or use of the antenna device and its antenna provided by the present invention will be described in the detailed description of the following embodiments. However, it should be understood by those of ordinary skill in the art that the present invention is not limited by the scope of the invention.

10, 30, 50‧‧‧ antenna devices

11, 31, 51‧‧‧ circuit boards

111‧‧‧ top surface

113‧‧‧ bottom

115‧‧‧ front

116‧‧‧ behind

117‧‧‧left side

118‧‧‧ right side

13, 33, 53‧‧‧ antenna

131‧‧‧Main radiator

1311‧‧‧Right angle bend

Extensions 1313, 3313, 5313‧‧

1315‧‧‧First connection segment

1316‧‧‧Second connection

1317‧‧‧ third connection

1318‧‧‧fourth connection

1319‧‧‧ fifth connection

133‧‧‧First short-circuit conductor

135‧‧‧Second short-circuit conductor

137‧‧‧Feed conductor

1371‧‧‧Feed into the power supply

H‧‧‧thickness

L1, L2‧‧‧ length

Fig. 1 is a schematic view showing a first embodiment of the antenna device of the present invention.

Fig. 2 is a plan view of Fig. 1.

Fig. 3 is a schematic view showing a second embodiment of the antenna device of the present invention.

Fig. 4 is a schematic view showing a third embodiment of the antenna device of the present invention.

Hereinafter, the antenna device of the present invention and its constituent components of the antenna and the achievement of the effect will be described with reference to the preferred embodiments of the drawings. However, the components, dimensions, and appearances of the antenna devices and their antennas in the drawings are merely illustrative of the technical features of the present invention and are not intended to limit the present invention.

As shown in Figs. 1 and 2, the figure is a schematic view of a first embodiment of the antenna device 10 of the present invention. The antenna device 10 of the present invention includes a circuit board 11 and an antenna 13. Circuit The plate 11 has a top surface 111, a bottom surface 113, a front side 115, a rear side 116, a left side 117 and a right side 118. The thickness H between the top surface 111 and the bottom surface 113 is between 1.4 and 1.8 mm. The antenna 13 is formed on the top surface 111 of the circuit board and includes a main radiator 131. The main radiator 131 includes a right angle bend portion 1311, an extension portion 1313, a first connection portion 1315, a second connection portion 1316, a third connection portion 1317, a fourth connection portion 1318, and a fifth connection portion. 1319. The extending portion 1313 extends from the inner side of the right-angled bent portion 1311, and the pattern of the extending portion 1313 is a right-angled triangle. The inner side of the right-angled bent portion 1311 is indicated by a broken line in the drawing, but the dotted line is actually absent, and the inner side of the right-angled bent portion 1311 means a 90-degree angle, in other words, the angle formed by the broken line is 90 degrees. Two right-angled sides of the extending portion 1313 adjacent to the right angle are connected to the inner side of the right-angled bent portion 1311. In short, the right-angled bent portion 1311 and the extended portion 1313 are integrally formed metal conductors.

The first and second connecting segments 1315 and 1316 respectively extend from the two ends of the right angle bent portion 1311. The first connecting portion 1315 is adjacent to the right side edge 118 of the circuit board 11 and parallel, and the second connecting portion 1316 is connected to the circuit board. The front side 115 of 11 is parallel. The fourth connecting section 1318 is adjacent to the left side 117 of the circuit board 11 and parallel to the left side 117. The third connecting section 1317 extends from the terminal end of the second connecting section 1316 to the bottom end of the fourth connecting section 1318, and the line width of the third connecting section 1317 is greater than the line width of the second connecting section 1316. The fifth connecting portion 1319 extends from the top end of the fourth connecting portion 1318 toward the right side 118 of the circuit board 11, and the end of the fifth connecting portion 1319 is adjacent to the right side 118 of the circuit board 11. The fifth connecting portion 1319 is parallel to the front edge 115 of the circuit board 11, and is also in parallel relationship with the second connecting portion 1316 and the third connecting portion 1317. Since the first to fifth connecting segments 1315-1319 of the main radiator 131 may have other shapes and configurations, the shape and composition of the main radiator 131 are not limited to the embodiment.

The antenna 13 of the present invention further includes a first short-circuit conductor 133, a second short-circuit conductor 135, and a feed-in conductor 137. The first short-circuit conductor 133 extends rightward from one end of the first connecting section 1315 and is perpendicular to the first connecting section 1315. The second shorting conductor 135 extends from one end of the first shorting conductor 133 and is perpendicular to the first shorting conductor 133 and is parallel to the right side 118 of the circuit board 11. The first short-circuit conductor 133, the second short-circuit conductor 135, and the main radiator 131 are integrally formed metal conductors. The feed conductor 137 extends leftward from the end of the first connecting section 1315 and faces the first shorting conductor 133. The feed conductor 137 has a feed power source 1371. Thus, the current fed to the power source 1371 flows through the feed conductor 137 and the first connection segment 1315 and the second short conductor The current outflow direction of 135 is perpendicular. Wherein, the above-mentioned directions of the upper, lower, left and right sides differ depending on the angle at which the antenna device is placed. Therefore, the direction is not limited to the above.

In this embodiment, the lengths L1, L2 of the two sides of the extension 1313 are of equal length and the length is between 0.5 and 1.2 mm, in other words, the extension 1313 is an isosceles triangle. In the figure, the lengths L1, L2 are made by using a boundary line as a dimension line to indicate both ends of the lengths L1, L2; therefore, the boundary line is not the outline of the antenna 13.

As such, the antenna 13 of the present invention can make the distribution of the radiation current uniform by the extension portion 1313, thereby obtaining an improvement in the efficiency of the antenna 13.

As shown in Figures 3 and 4, these two figures are schematic views of the second and third embodiments of the antenna devices 30, 50 of the present invention, respectively. In the second and third embodiments, the antenna devices respectively include a circuit board 31, 51 and an antenna 33, 53. The thickness and condition of the circuit boards 31 and 51 are the same as those of the first embodiment, and will not be described herein. The structures of the antennas 33 and 53 are also substantially the same as those of the first embodiment, and the same portions will not be described. The antennas 33 and 53 differ in that the lengths L1 and L2 of the extending portions 3313 and 5313 of the antennas 33 and 53 are not equal in length, forming a right-angled triangle, and the lengths L1 and L2 of the two sides are respectively 0.5 to 1.2 mm.

Although the three configurations of the antenna of the present invention have been described above, the extension of the antenna may be of other sizes and shapes, and thus is not limited to the three configurations proposed by the present invention. Subsequently, the design principle and the effect achieved by the antenna of the present invention will be explained.

The present invention is based on a circuit board having a dielectric constant of 4.2 and a thickness of 1.6 mm. When a circuit board with a dielectric constant equal to 4.2 and a thickness of 0.6 mm is used to design an antenna with the same conditions as the aforementioned design basis, a circuit board having a thickness of 0.6 mm requires a dielectric of 1 mm of air. The coefficient (the dielectric constant of air is 1), therefore, the dielectric coefficient obtained by a 0.6 mm board and 1 mm of air is less than 4.2, and the calculation of the dielectric coefficient is well known in the art. Therefore, I will not repeat them.

Therefore, if the value of the dielectric constant less than 4.2 is substituted into the formula (1), C of the formula (1) represents the speed of light, ε ₀ represents the permittivity of free space, and μ ₀ represents the permeability coefficient. (permeability), since the dielectric constant becomes smaller, it will increase the speed of light, and then substitute the speed of light into formula (2). The representative of equation (2), f , the resonant frequency, and λ , the wavelength, can be found. The resonance frequency is shifted.

f = C / λ formula (2)

Wherein, the magnetic permeability coefficient is related to the radiation current of the antenna. Therefore, the antenna of the present invention increases the triangular structure of the extension portion inside the right-angled bent portion of the main radiator, and evenly distributes the radiation current to change the Fringing Effect. The resonance frequency is shifted to a high frequency and the antenna efficiency is improved. Thus, the antenna system of the present invention can be effectively applied to a circuit board having a thickness of 1.4 to 1.8 mm.

In the above embodiments, the resonant frequency of the antenna is 2.4G, but the actual resonant frequency may be other frequency bands, so it is not limited to 2.4G. Further, the antenna of the present invention can effectively make the radiation current distribution on the right-angled bent portion more uniform, and therefore, the antenna of the present invention is not limited to being disposed on the circuit board.

Finally, it is emphasized that the constituent elements disclosed in the foregoing embodiments are merely illustrative and are not intended to limit the scope of the present invention, and alternatives or variations of other equivalent elements should also be the scope of the patent application of the present application. Covered.

10‧‧‧Antenna device

11‧‧‧ boards

111‧‧‧ top surface

113‧‧‧ bottom

115‧‧‧ front

116‧‧‧ behind

117‧‧‧left side

118‧‧‧ right side

13‧‧‧Antenna

131‧‧‧Main radiator

1311‧‧‧Right angle bend

1313‧‧‧Extension

1315‧‧‧First connection segment

1316‧‧‧Second connection

1317‧‧‧ third connection

1318‧‧‧fourth connection

1319‧‧‧ fifth connection

133‧‧‧First short-circuit conductor

135‧‧‧Second short-circuit conductor

137‧‧‧Feed conductor

1371‧‧‧Feed into the power supply

H‧‧‧thickness

L1, L2‧‧‧ length

Claims (10)

An antenna includes: a main radiator, including a right angle bend, an extension, a first connection section, a first short conductor, and a second short conductor, the extension extending from the right angle bend The inner side, and the pattern of the extending portion is a right-angled triangle, the two right-angled sides of the extending portion are connected to the inner side of the right-angled bent portion, and the first connecting portion extends from one end of the right-angle bent portion, the first short circuit The conductor extends from the first connecting section and is perpendicular to the first connecting section, and the second short conducting conductor extends from one end of the first shorting conductor and is perpendicular to the first shorting conductor. The antenna of claim 1, wherein the lengths of the two right sides of the extension are between 0.5 mm and 1.2 mm, respectively. The antenna of claim 1, wherein the two right-angled sides of the extension are equal in length. The antenna of claim 1, wherein the main radiator further includes a second connecting section, a third connecting section, a fourth connecting section and a fifth connecting section, the second connecting section extending From the other end of the right angle bent portion, the third connecting portion extends from the terminal end of the second connecting portion to the bottom end of the fourth connecting portion, and the fifth connecting portion is from the top end of the fourth connecting portion Extending to the right, the fifth connecting segment is parallel to the second connecting segment and the third connecting segment. The antenna of claim 4, further comprising a feed conductor extending leftward from the end of the first connecting segment and facing the first shorting conductor, the first short circuit The conductor is located to the right of the first connecting segment. An antenna device includes: a circuit board having a top surface and a bottom surface, the thickness between the top surface and the bottom surface being 1.4 to 1.8 mm; and an antenna formed on a top surface of the circuit board And including a main radiator, the main radiator includes a right-angled bent portion, an extending portion, a first connecting portion, a first short-circuiting conductor and a second short-circuiting conductor, the extending portion extending from the right-angled bent portion Inside, and the pattern of the extension is straight An angled triangle, the two right-angled sides of the extending portion are connected to an inner side of the right-angled bent portion, the first connecting portion extends from one end of the right-angle bent portion, the first short-circuiting conductor extends from the first connecting portion, and is vertical In the first connecting segment, the second shorting conductor system extends from one end of the first shorting conductor and is perpendicular to the first shorting conductor. The antenna device of claim 6, wherein the lengths of the two right sides of the extension are between 0.5 mm and 1.2 mm, respectively. The antenna device according to claim 6, wherein the two right-angled sides of the extending portion are equal in length. The antenna device of claim 6, wherein the circuit board includes a front side, a rear side, a left side, and a right side, and the main radiator further includes a second connecting section and a third connecting section. a fourth connecting section extending from the other end of the right angle bent portion, the first connecting section being parallel to a right side of the circuit board, the second connecting section being Parallel to the front side of the circuit board, the fourth connection segment is adjacent to the left side of the circuit board and parallel to the left side, the third connection segment extending from the terminal end of the second connection segment to the fourth connection segment The bottom end extends from the top end of the fourth connecting segment toward the right side of the circuit board, and the terminal end of the fifth connecting segment is adjacent to the right side of the circuit board. The antenna device of claim 9, wherein the antenna further comprises a feed conductor, the feed guide system extending leftward from the end of the first connection segment and facing the first short conductor The first short-circuit conductor is located to the right of the first connecting segment.