Broadband Antenna

Broadband antenna

The present invention is a wide-band antenna, and particularly refers to an antenna structure that can generate a wide-band antenna operating frequency band by using a single radiating conductor.

The radio frequency signal power output by the wireless communication equipment is transmitted to the antenna through the feed line, and is radiated and conducted through the antenna in the form of electromagnetic waves. After the electromagnetic wave arrives at the receiving location, the antenna receives it, and finally transmits it to the wireless communication product through the feeder line. Therefore, the antenna is an important medium for transmitting and receiving electromagnetic waves. The operating frequency range (bandwidth) of the antenna, whether it is a transmitting antenna or a receiving antenna, is usually limited to a certain frequency range. The antenna bandwidth has two definitions, one is the standing wave ratio SWR<img file="TWI415331B_D0001.tif" wi="40" he="57" img-format="tif" img-content="character" orientation="portrait" inline="no" />Under the condition of 1.5, the operating bandwidth of the antenna; the other refers to the bandwidth within the range of the antenna gain decreased by 3 decibels.

Please refer to Figure 1, which is a three-dimensional top view of US Patent No. 7,505,004 "BROADBAND ANTENNA". The radiating element 11 includes a first metal plane 111, a second metal plane 112, and a third metal plane 113 having a substantially quadrangular shape; wherein the first metal plane 111 and the second metal plane 112 are connected to each other, and the second metal plane 112 is also connected to each other. The third metal planes 113 are connected to each other to form a U-shaped structure. The first metal plane 111 and the third metal plane 113 are parallel to the plane where the ground element 13 and the printed circuit board 15 are located; the second metal plane 112 is perpendicular to the plane where the ground element 13 and the printed circuit board 15 are located, so that the radiating element U of 11 The font opening faces a direction parallel to the grounding element 13 and the printed circuit board 15. This patent emphasizes that the broadband antenna 100 not only has dual-frequency characteristics, but also has a better bandwidth.

However, in addition to the extremely complicated structure of the radiating element 11 in the above-mentioned patent, the connecting element 12 and its extended first end 121 of the connecting element and the second end 122 of the connecting element need to be provided, which are arranged as the radiating element 11 and the grounding element 13. The signal transmission medium, and the radiating element 11 and the connecting element 12 are designed to be bent in multiple sections, which is likely to cause signal transmission attenuation and reduce the efficiency of radiated energy transmission. In addition, the winding arrangement will increase manufacturing difficulty and production cost.

The object of the present invention is to provide a wideband antenna that can generate the fundamental frequency resonance mode and the double frequency resonance mode of the antenna system by using a single inverted V-shaped radiating conductor, shorten the radiation signal transmission path, and improve the radiation energy and signal conduction efficiency.

Another object of the present invention is to provide a wideband antenna, which utilizes the linear first end and second end design of the bent portion to extend, without the need for additional short-circuit connection elements, simplifies the antenna design structure, and avoids excessive bending of the radiating element. Processing, shorten assembly time and improve product manufacturing yield.

Another object of the present invention is to provide a broadband antenna, which uses the angle of the control bending part and the center wire to connect to the feeding position of the second end, and adjusts the frequency ratio of the fundamental mode and the double mode through this, and then By fine-tuning the size and length of the second end connected to the end of the ground plane, the impedance matching of the antenna system can be adjusted.

In order to achieve the above object, the present invention is a broadband antenna, including: The radiation conductor, the ground plane and the feed line; the radiation conductor is in the shape of an inverted V and has a bent part. The bent part is extended along two opposite side directions with a first end and a second end. The end and the second end are straight, so the bent part forms an angle, and the end of the second end is connected to the ground plane; the feed line has a center wire and an outer wire, connecting the center wire to the second end In the feed-in part of the part, the outer wire is connected to the ground plane.

The main feature of the embodiment of the present invention is that a single inverted V-shaped radiating conductor can generate the two previous resonance modes of the antenna system, which are the fundamental frequency resonance mode and the double frequency resonance mode, and the broadband antenna system is formed through the two resonance modes. Operating frequency band, while shortening the radiation signal transmission path, improving the radiation energy and signal conduction efficiency. Since the first end and the second end of the bent portion are designed to be straight, there is no need to provide additional short-circuit connection elements, which effectively simplifies the antenna design structure, avoids excessive bending and complicated processing of the radiating element, shortens the assembly time and improves the product Manufacturing yield. In addition, since the first end and the second end of the bending part extending along two opposite sides form an included angle, the feeding part of the second end is connected to the feeding part of the second end by controlling the number of angles of the bending part and the center wire of the feeding line. Proper adjustment of the position can make the fundamental frequency mode and the double frequency mode have a good frequency ratio, and then use the method of fine-tuning the size and length of the second end connected to the end of the ground plane, and the antenna system can be changed by proper adjustment. The imaginary part impedance is used to control the operating frequency positions of the fundamental frequency resonance mode and the double-frequency resonance mode to the operating frequency band required by the system, and achieve good impedance matching between the two modes, thereby increasing the operating bandwidth.

In order to enable your examiners to further understand the details of the present invention, the following preferred embodiments are described as follows.

Please refer to Figure 2, which is a perspective top view of an embodiment of the present invention. The radiation conductor 21 includes a radiating conductor 21, a ground surface 22 and a feed line 23; the radiating conductor 21 is provided with a bending portion 211, and the bending portion 211 is respectively extended along two opposite side directions with a first end portion 211a and a second end portion 211b The feed line 23 has a center wire 231 and an outer wire 232.

The radiating conductor 21 is arranged on the substrate 24. The radiating conductor 21 of this embodiment is designed in a V-shape and is arranged in an inverted V oblique configuration. At the same time, the bending portion 211 is respectively extended with a first end portion 211a along two opposite side directions. And a second end 211b. Since the first end 211a and the second end 211b are straight, an included angle is formed inside the bent portion, and the included angle range is controlled between 15 degrees and 90 degrees. The angle number method can make the fundamental frequency mode and the double frequency mode have an excellent frequency ratio. The end of the second end 211b is connected to the ground surface 22; the center wire 231 of the feeding line 23 is connected to the feeding part of the second end 211b At position 231a, the outer wire 232 is connected to the ground surface 22, and the center wire 231 is used to transmit the high-frequency transmission signal of the feeding wire 23 to the second end 211b, and at the same time, it is connected to the feeding portion 231a of the second end 211b through the control center wire 231 The position can also make the fundamental frequency mode and the double frequency mode have an excellent frequency ratio, and then use the method of fine-tuning the size and length of the second end 211b connected to the end of the ground surface 22, thereby changing the imaginary impedance of the antenna system , Control the operating frequency position of the fundamental frequency resonance mode and the double frequency resonance mode to the operating frequency band required by the system.

The radiating conductor 21 of this embodiment is in an inverted V-inclined shape, and the bending part is polygonal. Therefore, the radiating conductor 21 can be divided into three parts above the first end 211a. Angular shape and the lower triangle of the second end 211b. The longest side of the triangle at the first end 211a is about 25mm in length, the opposite side is about 23mm in length, and the bottom is about 3.5mm in length. The second end 211b is a triangle The length of the lower side is about 14mm, the length of the opposite side is about 10.5mm, the length of the short side of the bottom is about 3mm, the substrate 24 is rectangular, the length is about 38mm, and the width is about 7mm.

Please refer to FIG. 3, which is a three-dimensional top view of a variation of the radiation conductor according to the embodiment of the present invention. The difference in the implementation of this variation is that the bent portion 211 of the radiating conductor 21 and the extended first end 211a extend in the vertical direction above the substrate 24, thereby expanding the transmission area of the radiating conductor 21 and increasing the overall radiation conduction efficiency of the antenna system. Since the radiating conductor 21 of the present invention is arranged in an inverted V-inclined shape, the transmission area of the radiating conductor 21 can be increased according to the same configuration principle.

Please refer to FIG. 4, which is a three-dimensional top view of another variation of the radiation conductor according to the embodiment of the present invention. The difference in the implementation of this change is that the bending portion 211 of the radiation conductor 21 is set in a curved shape, so that the overall area of the radiation conductor 21 is reduced from the outside to the inside, and the center wire 231 is connected to the position of the feeding portion 231a at the second end 211b It is directly connected to the surface of the second end 211b. According to the above-mentioned variation of the two radiation conductors 21, it is known that the inverted V-tilted radiation conductor 21 designed in the present invention can be used to generate one of two resonance modes except for a single radiation conductor 21. In addition, it can be configured flexibly in response to changes in product volume at any time.

Please refer to FIG. 5, which is a schematic diagram of voltage standing wave ratio (VSWR) measurement data according to an embodiment of the present invention. When the voltage standing wave ratio is defined as 2, the operating frequency range of bandwidth S1 covers 2.2GHz to 2.8GHz, and the frequency range of this frequency band is Covers the system bandwidth of WLAN (2.4~2.5GHz) and WiMAX (2.3~2.7GHz). The operating frequency range of Bandwidth S2 covers 4.6GHz to 7GHz, and the frequency bandwidth of this frequency band covers the system bandwidth of WLAN (4.9~5.9GHz). The results of the above-mentioned voltage standing wave ratio measurement data show that the design of the present invention does have better operating bandwidth and impedance matching.

Please refer to FIG. 6, which is a partially enlarged three-dimensional top view of an embodiment of the present invention applied to a notebook computer. Attach the substrate 24 under the radiating conductor 21 to the surface of the side plate 61 of the notebook computer 6. The ground surface 22 is made of metal tin foil, and the bottom surface of the tin foil is completely pasted on the surface of the bottom plate 62 of the notebook computer 6. The bottom plate 62 is used as the entire antenna Since the radiating conductor 21 of the present invention is designed in an inverted V-tilted shape on the system ground plane, the overall area of the radiating conductor 21 can be configured to change according to the volume of the product at any time, thereby increasing the convenience of assembly.

The present invention has met the requirements of the patent, and actually has the characteristics of novelty, advancement and industrial application value. However, the embodiments are not used to limit the scope of the present invention. Any modification and modification made by anyone familiar with the art will not depart from The spirit and definition of the present invention are all within the scope of the rights of the present invention.

<p>100Broadband antenna</p><p>11Radiating element</p><p>111The first metal plane</p><p>112Second metal plane</p><p>113The third metal plane</p><p>12Connecting components</p><p>121The first end of the connecting element</p><p>122The second end of the connecting element</p><p>13Grounding element</p><p>14Feed-in line</p><p>15Printed Circuit Board</p><p>21Radiating conductor</p><p>211Bending part</p><p>211aFirst end</p><p>211bSecond end</p><p>22Ground surface</p><p>23Inlet line</p><p>231Center wire</p><p>231aInfeed part</p><p>232Outer wire</p><p>24Substrate</p><p>6Notebook</p><p>61Side panel</p><p>62Bottom plate</p>

Figure 1 is a three-dimensional top view of the broadband antenna of US Patent No. 7505004.

Figure 2 is a three-dimensional top view of an embodiment of the present invention.

FIG. 3 is a three-dimensional top view of a variation of the radiation conductor according to the embodiment of the present invention.

FIG. 4 is a three-dimensional top view of another modified embodiment of the radiation conductor according to the embodiment of the present invention.

Figure 5 is a schematic diagram of voltage standing wave ratio (VSWR) measurement data according to an embodiment of the present invention picture.

FIG. 6 is a partially enlarged three-dimensional top view of an embodiment of the present invention applied to a notebook computer.