TWI831257B - Dual polarization log-periodic antenna apparatus - Google Patents

Abstract

A dual polarization log-periodic antenna apparatus includes a log-periodic antenna and a conical reflector. The conical reflector is arranged below the log-periodic antenna. The log-periodic antenna is configured to transmit a plurality of radio waves. The conical reflector is configured to reflect the radio waves transmitted by the log-periodic antenna.

Description

Dual polarized log-periodic antenna device

The present invention relates to an antenna device, in particular to a dual-polarized log-periodic antenna device.

Dual-polarized log-periodic antenna is a non-frequency-variable antenna. Its electrical characteristics such as impedance, radiation field pattern, gain, standing wave ratio, etc. will change periodically with the logarithm of frequency, and remain basically constant over a wide frequency band. Change; the application range of dual-polarized log-periodic antennas is extremely wide, so dual-polarized log-periodic antennas are very important.

However, the current dual-polarized log-periodic antenna cannot effectively concentrate the emitted radio waves at high frequencies, so the current dual-polarized log-periodic antenna still has shortcomings as a directional antenna.

In order to solve the above problems, the object of the present invention is to provide a dual-polarized log-periodic antenna device.

In order to achieve the above objects of the present invention, the dual-polarized log-periodic antenna device of the present invention includes: a log-periodic antenna; and a cone-shaped reflector, and the cone-shaped reflection system is arranged on the log-periodic antenna. Below the line, the log-periodic antenna is configured to emit a plurality of radio waves; the cone-shaped reflector is configured to reflect the radio waves emitted by the log-periodic antenna.

Furthermore, in an embodiment of the dual-polarized log-periodic antenna device of the present invention as described above, the cone-shaped reflector may be, for example, but the present invention is not limited to a truncated cone.

Furthermore, in an embodiment of the dual-polarized log-periodic antenna device of the present invention as described above, the cone-shaped reflector may be, for example, but the present invention is not limited to a cone.

Furthermore, in an embodiment of the dual-polarized log-periodic antenna device of the present invention as described above, the cone-shaped reflection system is made of metal.

Furthermore, in an embodiment of the dual-polarized log-periodic antenna device of the present invention as described above, the metal may be, for example, but the present invention is not limited to aluminum.

Furthermore, in a specific embodiment of the dual-polarized log-periodic antenna device of the present invention as mentioned above, the log-periodic antenna includes: a printed circuit board, and the conical reflection system is disposed below the printed circuit board; a first planar log-periodic antenna structure, the first planar log-periodic antenna structure is formed on the printed circuit board; a second planar log-periodic antenna structure, the second planar log-periodic antenna structure is formed on the printed circuit board Above; a third planar log-periodic antenna structure, the third planar log-periodic antenna structure is formed on the printed circuit board and electrically connected to the first planar log-periodic antenna structure; and a fourth planar log-periodic antenna structure , the fourth planar log-periodic antenna structure is formed on the printed circuit board and is electrically connected to the second planar log-periodic antenna structure.

Furthermore, in a specific embodiment of the dual-polarized log-periodic antenna device of the present invention as mentioned above, the dual-polarized log-periodic antenna device further includes: a plurality of first support columns, and the first support columns are connected to the printed circuit board; and a plurality of second support pillars connected to the tapered reflector.

Furthermore, in a specific embodiment of the dual-polarized log-periodic antenna device of the present invention as mentioned above, the dual-polarized log-periodic antenna device further includes: a metal reflector plate, the metal reflector plate is connected to the The first supporting pillar and the second supporting pillars, the metal reflecting plate is arranged below the conical reflector, and the conical reflecting system is arranged between the printed circuit board and the metal reflecting plate.

Furthermore, in a specific embodiment of the dual-polarized log-periodic antenna device of the present invention as mentioned above, the dual-polarized log-periodic antenna device further includes: a lower shell, and the metal reflector is disposed on the lower shell on the body; and an upper shell, the upper shell system is combined with the lower shell to accommodate the logarithmic periodic antenna, the cone reflector, the first support pillars, the second support pillars and the metal reflector plate.

Furthermore, in a specific embodiment of the dual-polarized log-periodic antenna device of the present invention as mentioned above, the dual-polarized log-periodic antenna device is applied to a host, and the dual-polarized log-periodic antenna device further includes: A plurality of coaxial cables are electrically connected to the log-periodic antenna and the host.

The effect of the present invention is to change the radiation direction of the dual-polarized log-periodic antenna through the conical reflector.

In order to further understand the technology, means and effects adopted by the present invention to achieve the intended purpose, please refer to the following detailed description and drawings of the present invention. It is believed that the purpose, features and characteristics of the present invention can be understood in depth and concretely. However, the attached drawings are only for reference and illustration, and are not intended to limit the present invention.

10: Dual polarization log-periodic antenna device

20:Host

102: Log periodic antenna

104:Conical reflector

106: Radio waves

108:Printed circuit board

110: First planar log-periodic antenna structure

112: Second planar log-periodic antenna structure

114:Third planar log-periodic antenna structure

116: Fourth planar log-periodic antenna structure

118:First support column

120: Second support column

122:Metal reflective plate

124:Lower shell

126: Upper shell

128:Coaxial cable

130:Upper bottom surface

132: Lower bottom surface

134:High frequency area

136: Low frequency area

138: First high frequency partition

140: The second high frequency partition

142:hole

144:Springboard

146:Diameter

148:Length

0deg:0 degrees

90deg:90 degrees

180deg:180 degrees

270deg:270 degrees

Figure 1 is a combined appearance view of a specific embodiment of a dual-polarized log-periodic antenna device according to the present invention.

FIG. 2 is a perspective view from an angle of a specific embodiment of the dual-polarized log-periodic antenna device of the present invention.

FIG. 3 is a perspective view from another angle of a specific embodiment of the dual-polarized log-periodic antenna device of the present invention.

4 is a schematic side cross-sectional view of a specific embodiment of the dual-polarized log-periodic antenna device of the present invention.

FIG. 5 is a simplified schematic side cross-sectional view of a specific embodiment of the dual-polarized log-periodic antenna device of the present invention.

Figure 6 is a top view of a specific embodiment of the log-periodic antenna of the present invention.

7 is a radiation field pattern diagram in the horizontal direction (at a frequency of 5850 MHz) of a specific embodiment of the dual-polarized log-periodic antenna device of the present invention.

FIG. 8 is a radiation field pattern diagram in the vertical direction (at a frequency of 5850 MHz) of a specific embodiment of the dual-polarized log-periodic antenna device of the present invention.

FIG. 9 is a radiation field pattern diagram in the horizontal direction (at a frequency of 5850 MHz) of an example of a log-periodic antenna (without a tapered reflector) in the related art.

FIG. 10 is a radiation pattern diagram in the vertical direction (at a frequency of 5850 MHz) of an example of a log-periodic antenna (without a tapered reflector) in the related art.

In this disclosure, many specific details are provided in order to provide a thorough understanding of specific embodiments of the invention; however, one skilled in the art will understand that without one or more of these specific details, still capable of practicing the invention; otherwise not shown or described Well-known details are used to avoid obscuring the main technical features of the present invention. The technical content and detailed description of the present invention are as follows with reference to the drawings: Please refer to FIG. 5 , which is a simple side cross-sectional schematic diagram of a specific embodiment of the dual-polarized log-periodic antenna device 10 of the present invention; The purpose is to briefly describe the working principle of the dual-polarized log-periodic antenna device 10 of the present invention. As shown in FIG. 5 , a dual-polarized log-periodic antenna device 10 of the present invention includes a log-periodic antenna 102 and a cone reflector 104 . The cone reflector 104 is disposed below the log-periodic antenna 102 . The log-periodic antenna 102 is configured to emit a plurality of radio waves 106; the cone-shaped reflector 104 is configured to reflect the radio waves 106 emitted by the log-periodic antenna 102.

Furthermore, basically the log-periodic antenna 102 emits the radio waves 106 upward and downward simultaneously, but the purpose of FIG. 5 is only to briefly describe the dual-polarized log-periodic antenna device 10 of the present invention. Working principle, therefore, Figure 5 does not show all the radio waves 106 emitted outward by the log-periodic antenna 102, but simply shows the radio waves 106 that will be reflected by the cone-shaped reflector 104. The log-periodic antenna 102 emits the radio waves 106 upward.

Furthermore, due to the arrangement of the conical reflector 104, the radio waves 106 reflected by the conical reflector 104 will move toward the top of the log-periodic antenna 102, so the radio waves 106 reflected by the conical reflector 104 The radio waves 106 will merge with the radio waves 106 originally emitted upward by the log-periodic antenna 102, thereby concentrating the energy of the radio waves 106. The log-periodic antenna 102 is completely disposed outside the cone-shaped reflector 104; an upper bottom surface 130 of the cone-shaped reflector 104 is parallel to the log-periodic antenna 102 (made on a printed circuit board, such as in FIG. 6 printed circuit board 108), and the upper bottom surface 130 of the conical reflector 104 is closer to the log-periodic antenna 102 than the lower bottom surface 132 of the conical reflector 104.

Please refer to Figure 1, which is a combined appearance diagram of a specific embodiment of the dual-polarized log-periodic antenna device 10 of the present invention. The solid line in Figure 1 represents the appearance of the dual-polarized log-periodic antenna device 10, and The dotted lines represent the internal components of the dual-polarized log-periodic antenna device 10; please also refer to FIG. 2, which is a perspective view from one angle of a specific embodiment of the dual-polarized log-periodic antenna device 10 of the present invention. FIG. Looking down at the dual-polarized log-periodic antenna device 10; please also refer to FIG. 3, which is a perspective view from another angle of a specific embodiment of the dual-polarized log-periodic antenna device 10 of the present invention. FIG. 3 is Look up at the dual-polarized log-periodic antenna device 10 from bottom to top; please also refer to FIG. 4 , which is a schematic side cross-sectional view of a specific embodiment of the dual-polarized log-periodic antenna device 10 of the present invention.

The cone-shaped reflector 104 can be, for example, but the invention is not limited to a truncated cone or a cone; as shown in these figures, the cone-shaped reflector 104 is a truncated cone, but the cone-shaped reflector 104 is a cone. The effect of the present invention can also be achieved. The cone-shaped reflector 104 is made of a metal; the metal may be, but is not limited to, aluminum, for example. The dual-polarized log-periodic antenna device 10 is applied to a host 20. The dual-polarized log-periodic antenna device 10 further includes a plurality of first support posts 118 (for example, four), a plurality of second support posts 120 (for example, four). (four), a metal reflector 122, a lower housing 124, an upper housing 126 and a plurality of coaxial cables 128. The log-periodic antenna 102 includes a printed circuit board 108. Furthermore, the cone-shaped reflector 104 may be hollow, for example but not limited by the present invention, and the printed circuit board 108 may be square, for example but not limited by the present invention.

The conical reflector 104 is disposed below the printed circuit board 108; the first support pillars 118 are connected to the printed circuit board 108; the second support pillars 120 are connected to the conical reflector 104; The metal reflective plate 122 is connected to the first support pillars 118 and the second support pillars 120 . The metal reflective plate 122 is disposed below the conical reflector 104 . The conical reflector 104 is disposed under Between the printed circuit board 108 and the metal reflection plate 122; the metal reflection plate 122 is disposed on the lower housing 124; the upper housing 126 is assembled to the lower housing 124 to accommodate the logarithmic periodic antenna 102 , the conical reflector 104, the first support pillars 118, the second support pillars 120 and the metal reflector 122; the coaxial cables 128 are electrically connected to the logarithmic periodic antenna 102 and the host 20 .

Please refer to FIG. 6 , which is a top view of a specific embodiment of the log-periodic antenna 102 of the present invention. In addition to the printed circuit board 108 , the log-periodic antenna 102 further includes a first planar log-periodic antenna structure 110 , a second planar log-periodic antenna structure 112 , a third planar log-periodic antenna structure 114 and a fourth planar log-periodic antenna structure 114 Log-periodic antenna structure 116; the first planar log-periodic antenna structure 110 is formed on the printed circuit board 108; the second planar log-periodic antenna structure 112 is formed on the printed circuit board 108; the third planar log-periodic antenna structure 116 The antenna structure 114 is formed on the printed circuit board 108 and is electrically connected to the first planar log-periodic antenna structure 110; the fourth planar log-periodic antenna structure 116 is formed on the printed circuit board 108 and is electrically connected to The second planar log-periodic antenna structure 112 . In other words, the log-periodic antenna 102 is a planar log-periodic antenna.

Furthermore, please refer to FIG. 6 again. The log-periodic antenna 102 is configured to distinguish a high-frequency area 134 and a low-frequency area 136 on the printed circuit board 108. The low-frequency area 136 is configured to surround the high-frequency area 134. And the high frequency area 134 includes the first planar log-periodic antenna structure 110, the second planar log-periodic antenna structure 112, the third planar log-periodic antenna structure 114 and the fourth planar log-periodic antenna structure 116; the low frequency area A low frequency of 136 may be, for example but not limited to, 617MHz~960MHz, and a high frequency of the high frequency area 134 may be, for example but not limited to, 1500MHz~5925MHz.

Furthermore, please refer again to FIG. 6 , the log-periodic antenna 102 is configured to further define that the high-frequency area 134 includes a first high-frequency area 138 and a second high-frequency area 140 , and the first high-frequency area 138 includes the Half of the first planar log-periodic antenna structure 110 , the second planar log-periodic antenna structure 112 and the third planar log-periodic antenna structure 114 , and the second high-frequency partition 140 includes the first planar log-periodic antenna The other half of the structure 110 , the fourth planar log-periodic antenna structure 116 and the other half of the third planar log-periodic antenna structure 114 .

Furthermore, the radiation field pattern of the log-periodic antenna in the related art is directed toward the front of the stack; please refer to FIG. 6 again. The log-periodic antenna 102 of the present invention is configured to combine the first planar log-periodic antenna. The antenna structure 110 and the third planar log-periodic antenna structure 114 form a polarization direction array antenna, and the second planar log-periodic antenna structure 112 and the fourth planar log-periodic antenna structure 116 are combined to form an orthogonal polarization direction. array antenna to achieve higher gain values.

Furthermore, because the log-periodic antenna in the related art only has a planar metal reflector and does not have the tapered reflector 104 of the present invention (as shown in FIG. 2), the log-periodic antenna in the related art can only synthesize low-frequency energy. High-frequency energy cannot be synthesized. This is because the planar metal reflector of the log-periodic antenna in the related art is far away from the log-periodic antenna in the related art. Moreover, in different frequency bands, the log-periodic antenna has different antenna lengths. The distance between 102 and the reflective surface of the conical reflector 104 also needs to be changed (using the conical reflective surface) to form a single main wave. However, the log-periodic antenna in the related art only has a planar metal reflector, so the related art The radiation field pattern of the log-periodic antenna cannot change accordingly, and the high-frequency energy of the log-periodic antenna in the related technology cannot be synthesized into a single main wave.

Furthermore, the high-frequency energy of the log-periodic antenna 102 of the present invention can be combined, reflected by the conical reflector 104 and bounced forward to form a single main wave; the dual-polarized log-periodic antenna device 10 of the present invention It is a broadband (1500MHz~5925MHz) directional antenna. Please refer to Figure 7, which is a horizontal radiation field pattern diagram (at a frequency of 5850 MHz) of a specific embodiment of the dual-polarized log-periodic antenna device 10 of the present invention; please refer to Figure 8, which is a dual-polarized log-periodic antenna device 10 of the present invention. The radiation pattern in the vertical direction of a specific embodiment of the polarized log-periodic antenna device 10 (at a frequency of 5850 MHz); please refer to Figure 9, which is an example of a log-periodic antenna (without a tapered reflector) in the related art. The radiation field pattern in the horizontal direction (at the frequency of 5850MHz); please refer to Figure 10, which is the radiation field pattern in the vertical direction (at the frequency of one example of a log-periodic antenna (without a tapered reflector) in the related art) (5850MHz); as shown in Figure 7 to Figure 10, 0deg represents 0 degrees, 90deg represents 90 degrees, 180deg represents 180 degrees, and 270deg represents 270 degrees. As shown in Figure 7 and Figure 8, the dual polarization log-periodic antenna device of the present invention 10 high-frequency energy can be combined; as shown in Figures 9 and 10, the high-frequency energy of the log-periodic antenna in the related art cannot be combined.

Furthermore, please refer to Figures 2, 3 and 4. The cone-shaped reflector 104 defines a hole 142 (on the upper bottom surface 130 as shown in Figure 5), and the log-periodic antenna 102 further includes a springboard 144. , the springboard 144 is disposed on the printed circuit board 108 (reverse side) through the hole 142, and the third planar log-periodic antenna structure 114 is electrically connected to the first planar log-periodic antenna structure 110 through the spring board 144. The function of the springboard 144 is to prevent signals from group A antennas (the first planar log-periodic antenna structure 110 plus the third planar log-periodic antenna structure 114) from being mixed into group B antennas (the second planar log-periodic antenna structure 112 plus the third planar log-periodic antenna structure 114). The signal of the fourth planar log-periodic antenna structure 116); if the antenna group A is regarded as the positive electrode and the antenna group B is regarded as the negative electrode, the springboard 144 can prevent the two sets of antennas from forming a short circuit between the positive and negative electrodes. Furthermore, the diameter 146 of the hole 142 is equal to the length 148 of the springboard 144; that is, the hole 142 is made as small as possible to prevent high-frequency radio waves from passing through the hole 142.

The effect of the present invention is to change the radiation direction of the dual-polarized log-periodic antenna through the conical reflector.

However, the above are only preferred embodiments of the present invention and cannot limit the scope of the present invention. That is, all equivalent changes and modifications made in accordance with the claims of the present invention should still fall within the scope of the patent of the present invention. Category intended to be protected. The present invention can also have various other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention. However, these corresponding changes and modifications are It should fall within the protection scope of the appended claims of the present invention. In summary, it should be understood that the present invention has industrial applicability, novelty and progressiveness, and the structure of the present invention has never been seen in similar products and has been publicly used. It fully meets the requirements for an invention patent application and the application can be filed in accordance with the patent law.

10: Dual polarization log-periodic antenna device

102: Log periodic antenna

104:Conical reflector

106: Radio waves

130:Upper bottom surface

132: Lower bottom surface

Claims (9)

A dual-polarized log-periodic antenna device includes: a log-periodic antenna; and a cone-shaped reflector. The cone-shaped reflection system is disposed below the log-periodic antenna, wherein the log-periodic antenna is configured to transmit complex wireless signals. Radio waves; the cone-shaped reflector is configured to reflect the radio waves emitted by the log-periodic antenna; wherein the log-periodic antenna includes: a printed circuit board, and the cone-shaped reflection system is disposed below the printed circuit board; a first planar log-periodic antenna structure, the first planar log-periodic antenna structure is formed on the printed circuit board; a second planar log-periodic antenna structure, the second planar log-periodic antenna structure is formed on the printed circuit board Above; a third planar log-periodic antenna structure, the third planar log-periodic antenna structure is formed on the printed circuit board and electrically connected to the first planar log-periodic antenna structure; and a fourth planar log-periodic antenna structure , the fourth planar log-periodic antenna structure is formed on the printed circuit board and is electrically connected to the second planar log-periodic antenna structure. The dual-polarized log-periodic antenna device as claimed in claim 1, wherein the cone-shaped reflection system is a truncated cone. The dual-polarized log-periodic antenna device as claimed in claim 1, wherein the cone-shaped reflection system is a cone. The dual-polarized log-periodic antenna device as claimed in claim 2, wherein the cone-shaped reflection system is made of metal. The dual polarization log-periodic antenna device as claimed in claim 4, wherein the metal is aluminum. The dual-polarized log-periodic antenna device as claimed in claim 5, further comprising: a plurality of first support columns, the first support columns being connected to the printed circuit board; and a plurality of second support columns, the plurality of second support columns being connected to the printed circuit board. Two supporting columns are connected to the conical reflector. The dual-polarized log-periodic antenna device as claimed in claim 6, further comprising: a metal reflector plate, the metal reflector plate is connected to the first support pillars and the second support pillars, the metal reflector plate is provided Below the conical reflector, the conical reflective system is disposed between the printed circuit board and the metal reflective plate. The dual-polarization log-periodic antenna device as claimed in claim 7 further includes: a lower housing, the metal reflection plate is arranged on the lower housing; and an upper housing, the upper housing system is combined with the lower housing The body is used to accommodate the logarithmic periodic antenna, the cone reflector, the first support pillars, the second support pillars and the metal reflection plate. The dual-polarized log-periodic antenna device described in claim 8 is applied to a host. The dual-polarized log-periodic antenna device further includes: a plurality of coaxial cables, and the coaxial cables are electrically connected to the log-periodic antenna. Periodic antenna and the host.