TWI876601B - Multi-band and broadband short-circuited inverted-F antenna - Google Patents

Abstract

The present invention relates to a multi-band and broadband short-circuit inverted F-type antenna, comprising: a radio frequency circuit area, which has the function of improving the antenna performance; a feed point, which is arranged in the radio frequency circuit area and is provided with a preset cable welding; a signal line, which is arranged in the radio frequency circuit area, and the two sides of the signal line are each spaced apart from the radio frequency circuit area, and one end of the signal line is electrically connected to the feed point; a radiation area, which is arranged at least on one side of the radio frequency circuit area, and the radiation area includes A low/medium frequency common path extends from the other end of the ground line toward the first direction, a medium frequency radiation portion extends toward the second direction at the end of the low/medium frequency common path, and a low frequency radiation path for low frequency signals to pass through extends toward the third direction. The low frequency path extends toward the fourth direction through a turn to form a low/high frequency radiation portion, and a short circuit area for high frequency signals to pass through is formed inside the low/high frequency radiation portion, the low/medium frequency common path and the low frequency path.

Description

Multi-band and broadband short-circuited inverted F antenna

The present invention provides a multi-band and broadband short-circuit inverted F-type antenna, particularly a miniaturized multi-band and broadband antenna, and realizes an antenna with high isolation and omnidirectional radiation field in the limited space constraints of wireless communication electronic devices and multiple antenna environments.

According to the report, wireless communication technology is an indispensable part of the convenient life in today's society. In addition to the comprehensive deployment of wired and wireless local area networks, wireless communication devices must also be equipped with wireless antennas to receive and transmit signals. Only then can mobile electronic devices use the Internet and transmit data through wireless local area networks.

The antennas of the above-mentioned wireless communication electronic devices are usually single bodies or integrated with other antennas with different functions. They are usually large in size and affect the circuit layout of the wireless communication electronic devices. In the past, the antennas could only have a bandwidth utilization rate of about 7%, and could not achieve broadband and multi-band performance. The radiation field of the antenna could not achieve a complete broadband frequency band under the limited space of the wireless communication electronic devices, and could not have good isolation in the wireless communication electronic devices with multiple antennas. Based on the above, the operating bandwidth of wireless antennas is required to be designed towards multi-band and wideband frequency bands. Under the premise of not occupying too much space inside the wireless communication electronic device, how to increase the frequency band and improve the bandwidth has become a goal that those engaged in this industry are eager to work hard for.

Therefore, in view of the above problems and deficiencies, the inventor collected relevant information and, after multiple evaluations and considerations, designed the invention of this multi-band and broadband short-circuit inverted F-type antenna.

The main purpose of the present invention is to provide a multi-band and broadband short-circuit inverted F-type antenna, comprising: an RF circuit area, which has the function of improving the antenna performance; a feed point, which is arranged in the RF circuit area and is provided with a preset cable welding; a signal line, which is arranged in the RF circuit area, and there is a distance between the two sides of the signal line and the RF circuit area, and one end of the signal line is electrically connected to the feed point; a radiation area, which is arranged at least on one side of the RF circuit area, and the radiation area is connected to the feed point. The radiation area includes a low/medium frequency common path extending from the other end of the ground line toward the first direction, a medium frequency radiation portion extending toward the second direction at the end of the low/medium frequency common path, and a low frequency radiation path extending toward the third direction for low frequency signals to pass through. The low frequency path extends toward the fourth direction through a turn to form a low/high frequency radiation portion, and a short circuit area for high frequency signals to pass through is formed inside the low/high frequency radiation portion, the low/medium frequency common path and the low frequency path. Through the above-mentioned simple structure and good performance antenna, the antenna can be made in a flat or three-dimensional form. The antenna also has a single feed structure of co-planar waveguide (CPW). The signal line of the short-circuited inverted F-type antenna is electrically connected to the ground area through the ground line, which can achieve broadband and multi-band performance from MHz to mmWave (millimeter wave); at the same time, it is easy to make multiple antennas with high isolation in the multi-sided RF circuit area.

The secondary purpose of the present invention is to form a high-frequency short-circuit area in the short-circuit area from the low/medium frequency common path to the low/high frequency radiation part, and the length of the high-frequency short-circuit area is one-quarter of the wavelength of the high-frequency center frequency.

Another object of the present invention is that the preferred implementation shape of the short-circuit area is a triangle, and the high-frequency short-circuit area is formed on the hypotenuse of the triangle.

Another purpose of the present invention is that the medium frequency radiation portion is provided with a top loading portion protruding toward at least one side as an impedance matching portion of the resonant frequency band, and the top loading portion is in a rectangular shape.

Another purpose of the present invention is to provide a first open-circuit stub and a second open-circuit carrier on the other side of the short-circuit area of the low/medium frequency common path, and the first open-circuit stub is a rectangle and the second open-circuit stub is a straight line.

1: Short-circuit inverted F-type antenna

11: RF circuit area

110: Spacing

12: Coupling surface

13: Feed point

14:Signal cable

15: Fallout Zone

151: Low/medium frequency shared path

152: Medium frequency radiation department

153: Low frequency path

154: Low/high frequency radiation section

155, 155a, 155b: short circuit area

1551: High frequency short circuit

156: Top loading part

157: First open circuit stub

158: Second open circuit stub

[Figure 1] is the first viewing angle structure diagram of the short-circuited inverted F antenna of the present invention.

[Figure 2] is a second viewing angle structural diagram of the short-circuited inverted F antenna of the present invention.

[Figure 3] is a schematic diagram of the guided radiation paths of the low-frequency, medium-frequency and high-frequency paths of the short-circuited inverted-F antenna of the present invention.

[Figure 4] is another implementation structure diagram of the short-circuit area of the short-circuit inverted-F antenna of the present invention.

[Figure 5] is another implementation structure diagram of the short-circuit area of the short-circuit inverted-F antenna of the present invention.

[Figure 6] is a diagram showing the implementation structure of the present invention in which multiple short-circuited inverted-F antennas are set up in the RF circuit area.

[Figure 7] is another implementation structure diagram of the present invention in which multiple short-circuited inverted-F antennas are set in the RF circuit area.

[Figure 8] is a table showing the 3D radiation efficiency of the short-circuited inverted-F antenna of the present invention in each frequency band.

In order to achieve the above-mentioned purpose and effect, the technical means and structure adopted by the present invention are described in detail in the following figure for the preferred embodiment of the present invention, and its features and functions are explained in detail, so as to facilitate a complete understanding.

Please refer to Figures 1 and 2, which are the first and second perspective structural diagrams of the short-circuited inverted F-type antenna of the present invention. It can be clearly seen from the figures that the main components and features of the multi-band and broadband short-circuited inverted F-type antenna of the present invention are described in detail as follows: A radio frequency circuit area 11 has the function of improving the antenna performance.

A feed point 13 is provided in the RF circuit area 11 and is provided for welding a preset cable (not shown in the figure).

A signal line 14 is disposed in the RF circuit area 11. There is a distance 110 between the two sides of the signal line 14 and the RF circuit area 11, and one end of the signal line 14 is electrically connected to the feed point 13.

A radiation zone 15 is provided at at least one side of the RF circuit zone 11. The radiation zone 15 includes a low/medium frequency common path 151 extending from the other end of the signal line 14 toward a first direction, an intermediate frequency radiation portion 152 extending toward a second direction at the end of the low/medium frequency common path 151, and a low frequency path 153 extending toward a third direction for a low frequency resonance signal to pass through. The low-frequency path 153 extends toward the fourth direction through a turn to form a low/high-frequency radiation portion 154, and the low/high-frequency radiation portion 154, the low/medium-frequency common path 151 and the low-frequency path 153 form a short-circuit area 155 for high-frequency signals to pass through. The first direction is 180 degrees away from the fourth direction; and the second direction is 180 degrees away from the third direction.

The short-circuited inverted F-type antenna 1 is a planar antenna printed on a printed circuit board (PCB). The RF circuit area 11 and the radiation area 15 are arranged on the first surface of the PCB, and the second surface of the PCB is further provided with a coupling surface 12 (as shown in FIG. 2 ). The coupling surface 12 corresponds to the RF circuit area 11, and the RF circuit area 11 covers the signal line 14, which can increase the high-frequency bandwidth of the antenna; or, the short-circuited inverted F-type antenna 1 is composed of a three-dimensional metal antenna, but the three-dimensional metal antenna does not include the coupling surface 12 of the planar antenna, and those familiar with the art can use the circuit board grounding area or the metal shell of the wireless communication electronic device (not shown in the figure) as the coupling surface 12 to achieve matching coupling or frequency band adjustment of the three-dimensional metal antenna.

The RF circuit area 11 and the coupling surface 12 are formed of rectangles with similar or identical areas.

The shortest path from the low/medium frequency common path 151 to the low/high frequency radiation part 154 in the short-circuit area 155 forms a high-frequency short circuit 1551, and the length of the high-frequency short circuit 1551 is one-quarter wavelength (1/4λ) of the high-frequency center frequency.

The preferred implementation shape of the short-circuit area 155 is a triangle, and the high-frequency short circuit 1551 is formed on the hypotenuse of the triangle; however, the present invention does not limit the shape of the short-circuit area, such as the short-circuit area 155a in a step shape as disclosed in FIG. 4, or the short-circuit area 155b in a multi-arc shape as disclosed in FIG. 5, are all implementable structures. As long as the high-frequency short circuit (the oblique edge of the short-circuit area 155a in a step shape or the short-circuit area 155b in a multi-arc shape) can meet the length of one quarter of the high-frequency center frequency (1/4λ), the effect of serving as a high-frequency short circuit can be achieved. Not only the high-frequency resonance part, but also the path length of other parts such as the low-frequency resonance or the mid-frequency resonance must also conform to one-quarter wavelength (1/4λ) of the low-frequency center frequency or the mid-frequency center frequency respectively, in order to achieve broadband and multi-band performance optimization.

The above-mentioned mid-frequency radiation portion 152 is provided with a top-loading portion 156 (Top-Loading) protruding toward at least one side as an impedance matching of the frequency band, and the top-loading portion 156 is in a rectangular shape.

The low/medium frequency common path 151 is provided with a first open-stub 157 and a second open-stub 158 protruding from the short-circuit region 155, and the first open-stub 157 is in a rectangular shape and the second open-stub 158 is in a straight line shape.

The low-frequency operating band of the short-circuited inverted F-type antenna 1 is 2.4~2.5GHz; the medium-frequency operating band is 5.15~5.85GHz; and the high-frequency operating band is 5.925~7.125GHz. Please refer to Figure 3, where the transmission path of the low-frequency signal is from the signal line 14, the low/medium frequency common path The transmission path of the medium frequency resonant signal is from the signal line 14, the low/medium frequency common path 151 and the medium frequency radiation part 152; the transmission path of the high frequency resonant signal is from the signal line 14, the high frequency short circuit 1551 of the short circuit area 155 and the low/high frequency radiation part 154. The above three different transmission paths form a multi-band and broadband antenna band.

Please refer to Figures 6 and 7, which are respectively an implementation structure diagram of the present invention in which a plurality of short-circuited inverted F-type antennas are arranged in the RF circuit area and another implementation structure diagram, wherein Figure 6 discloses that a radiation area 15 is provided on each of the two adjacent sides of the RF circuit area 11, and the forward virtual extension lines (not shown in the figure) of the mid-frequency radiation parts 152 of the two radiation areas 15 form an intersection; furthermore, Figure 7 discloses that a radiation area 15 is provided on each of the four sides of the RF circuit area 11, and the forward virtual extension lines (not shown in the figure) of the mid-frequency radiation parts 152 of the four radiation areas 15 are divided into two groups to form an intersection. By the foregoing, an omnidirectional antenna is formed with high isolation and can be applied to different wireless communication electronic devices.

Please refer to Figure 8, which is a 3D radiation efficiency table of the short-circuited inverted F-type antenna of the present invention in each frequency band. The peak gain range of each sampling point in the low, medium and high frequency operating bands of the short-circuited inverted F-type antenna 1 in this case is between 1.13 and 3.34 dBi; and the efficiency range is between 49.28 and 76.07%. Both the peak gain and efficiency are within the applicable range of each frequency band of the short-circuited inverted F-type antenna 1.

The short-circuited inverted F-type antenna 1 disclosed in the present invention has the following characteristics:

1. The signal feeding structure of the short-circuited inverted F-type antenna 1 adopts a symmetrical (or asymmetrical) coplanar waveguide (CPW) feeding method. The coupling surface 12 of the short-circuited inverted F-type antenna 1 corresponds to the RF circuit area 11, and the RF circuit area 11 covers the signal line 14, which can increase the high-frequency bandwidth of the antenna.

2. A top-loading portion 156 is provided on the medium-frequency radiation portion 152; a first open-stub 157 and a second open-stub 158 are provided on the other side of the short-circuit region 155 on the low/medium-frequency common path 151. The aforementioned structures can improve the impedance matching and bandwidth of the antenna's frequency band.

3. A plurality of radiation areas 15 are provided on at least two sides of the RF circuit area 11 to form an omnidirectional antenna with high isolation and applicable to different wireless communication electronic devices.

4. The short-circuited inverted F-type antenna 1 can be manufactured in a flat or three-dimensional form to achieve antenna manufacturing diversity for application in various wireless communication electronic devices, and can also achieve broadband and multi-band performance from MHz to mmWave (millimeter wave).

The above is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Therefore, all simple modifications and equivalent structural changes made by using the contents of the present invention's specification and drawings should be included in the patent scope of the present invention and should be stated.

In summary, the multi-band and broadband short-circuited inverted F-type antenna of this invention can achieve its effect and purpose when used. Therefore, this invention is truly an invention with excellent practicality. In order to meet the application requirements of invention patents, an application is filed in accordance with the law. I hope that the review committee will approve this case as soon as possible to protect the inventor's hard work. If the review committee of the Jun Bureau has any doubts, please feel free to write to instruct. The inventor will do his best to cooperate and feel very grateful.

1: Short-circuit inverted F-type antenna

11: RF circuit area

110: Spacing

13: Feed point

14:Signal cable

15: Fallout Zone

151: Low/medium frequency shared path

152: Medium frequency radiation department

153: Low frequency path

154: Low/high frequency radiation section

155: Short circuit area

1551: High frequency short circuit

156: Top loading part

157: First open circuit stub

158: Second open circuit stub

Claims (9)

A multi-band and broadband short-circuit inverted F-type antenna includes: a radio frequency circuit area, which has the function of improving the antenna performance; a feed point, which is arranged in the radio frequency circuit area and is provided with a preset cable welding; a signal line, which is arranged in the radio frequency circuit area, and the two sides of the signal line are each spaced apart from the radio frequency circuit area, and one end of the signal line is electrically connected to the feed point; and a radiation area, which is arranged at least on one side of the radio frequency circuit area, and the radiation area includes a first direction extending from the other end of the signal line. A low/medium frequency common path, at the end of the low/medium frequency common path, a medium frequency radiation portion extends toward the second direction and a low frequency path for low frequency signals to pass through extends toward the third direction. The low frequency path extends toward the fourth direction through a turn to form a low/high frequency radiation portion. A short circuit area for high frequency signals to pass through is formed inside the low/high frequency radiation portion, the low/medium frequency common path and the low frequency path. The short circuit area is preferably in the shape of a triangle, and a high frequency short circuit is formed on the hypotenuse of the triangle. As in claim 1, the short-circuited inverted F-type antenna with multiple frequencies and wideband is a planar antenna printed on a printed circuit board, the RF circuit area and the radiation area are arranged on the first surface of the printed circuit board, and the second surface of the printed circuit board is further provided with a coupling surface. As in claim 2, the short-circuited inverted F-type antenna for multi-band and broadband, wherein the RF circuit area and the coupling surface are formed of a rectangle or a long rectangle with a similar or identical area. As in claim 1, the multi-band and broadband short-circuited inverted-F antenna is composed of a three-dimensional metal antenna. As in the multi-band and broadband short-circuited inverted F-type antenna of claim 1, the short-circuited region forms the high-frequency short circuit in the shortest path from the low/medium frequency common path to the low/high frequency radiation part, and the length of the high-frequency short circuit is one-quarter of the wavelength of the high-frequency center frequency. As in claim 1, the short-circuited inverted F-type antenna for multi-band and broadband, wherein the mid-band radiating portion is provided with a top loading portion protruding toward at least one side for impedance matching of the frequency band, and the top loading portion is in a rectangular shape. As in claim 1, the multi-band and broadband short-circuited inverted F-type antenna, wherein the low/medium frequency common path is provided with a first open-circuited stub and a second open-circuited carrier protruding on the other side of the short-circuited area, and the first open-circuited stub is in a rectangular shape and the second open-circuited stub is in a straight line shape. For example, the multi-band and broadband short-circuited inverted-F antenna of claim 1, wherein the low-frequency operating band of the short-circuited inverted-F antenna is 2.4~2.5GHz; the mid-frequency operating band is 5.15~5.85GHz; and the high-frequency operating band is 5.925~7.125GHz. The multi-band and broadband short-circuited inverted-F antenna of claim 1, wherein the first direction differs from the fourth direction by 180 degrees; and the second direction differs from the third direction by 180 degrees.

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