TWI387154B - A planar dipole antenna with multipath parasitic elements - Google Patents

Description

Planar dipole antenna with multipath parasitic elements

The present invention relates to a planar dipole antenna comprising a multipath parasitic element, in particular to a dual frequency operation in accordance with the WiMAX tri-band, and having good radiation characteristics.

According to the current WiMAX wireless communication has become popular, especially in the use of notebook computers, PDAs or 3G mobile phones and other equipment, will develop towards unlimited transmission, in order to achieve broadband wireless transmission, the communication frequency band must be multi-frequency and broadband, so the design is more Frequency and wideband antennas are a major trend, and in order to achieve multi-frequency and wide-band effects, the prior art must increase the number of antennas or cover the operating frequency band with a wide-band antenna. In the conventional antenna design, the number of antennas is relatively increased. It will increase the size of the antenna, so it is inconvenient to use in portable communication equipment; and the antenna structure is mostly complicated, which makes it difficult to manufacture. In application, the width of the dipole antenna is also the focus of manufacturing. The smaller the width, the easier it is to use in application, or the lack of bandwidth or poor field shape is one of the disadvantages; in practice, today's stereo dipole antenna is also one of the often proposed architectures, and its length Too long is also a major drawback in application.

Therefore, in view of the above-mentioned shortcomings of the antenna, the present invention provides a planar dipole antenna including a single-path parasitic element, comprising: a microwave substrate, which is a rectangular parallelepiped having long sides and short sides; a strip formed at the center of the microwave substrate and sagged with one of the microwave substrates Straight, the first end and the second end are respectively extended to the microwave substrate to form a long rectangular block, the first end extends leftward to the first inductive strip, and the second end extends to the right The second inductive strip forms a metal strip of approximately zigzag shape; the second metal strip extends horizontally from the left side of the microwave substrate to the first metal strip to form an elongated rectangular block, wherein the second metal strip The third end of the metal strip extends horizontally from the right side of the microwave substrate to the first metal strip to form a long rectangular block, wherein the left end of the third metal strip is Two contacts; the first contact is a feed point, and the second contact is a ground point, or the first contact is a ground point, and the second contact is a feed point.

The microwave substrate is an FR4 microwave substrate having a length of 45 mm, a width of 7 mm, a thickness of 0.8 mm, and a dielectric constant of 4.4.

The first metal strip is perpendicular to a long side of the microwave substrate.

The length and width of the second metal strip are the same as the length and width of the third metal strip.

The planar dipole antenna including the single-path parasitic element is connected to the ground point and the feed point by using a 50 ohm coaxial cable.

When the total length of the first metal strip, the first inductive strip and the second inductive strip is 19 mm, the operating frequency band is 2.5 GHz to 2.7 GHz and 5.47 GHz to 5.79 GHz.

A planar dipole antenna having dual path parasitic elements, including: The microwave substrate is a rectangular parallelepiped having a long side and a short side; the first metal strip is formed at a center of the microwave substrate and perpendicular to one side of the microwave substrate, and the first end and the second end are respectively extended to the Forming a long rectangular block on the edge of the microwave substrate, the first end extends to the right to the third inductive strip, the first inductive strip extends to the left, and the second end extends to the left to extend the fourth inductive strip to the right. The second inductive strip is formed such that the first metal strip, the third inductive strip, the first inductive strip, the fourth inductive strip, and the second inductive strip form an approximate I-shaped metal strip; the second metal strip is formed by the microwave The left side of the substrate extends horizontally to the first metal strip to form a long rectangular block, wherein the right end of the second metal strip is a first contact; and the third metal strip is from the right side of the microwave substrate The first metal strip extends horizontally to form a long rectangular block, wherein the left end of the third metal strip is a second contact; the first contact is a feed point, and the second contact Is the grounding point, or the first contact is the grounding point, then the second Point of the feed point.

The microwave substrate is an FR4 microwave substrate having a length of 45 mm, a width of 7 mm, a thickness of 0.8 mm, and a dielectric constant of 4.4.

The first metal strip is perpendicular to a long side of the microwave substrate.

The length and width of the second metal strip are the same as the length and width of the third metal strip.

The planar dipole antenna including the dual path parasitic element described above Connect to the ground and feed points with a 50 ohm coaxial cable.

When the total length of the first metal strip, the third inductive strip and the fourth inductive strip is 29 mm, the operating frequency band is 2.5 GHz to 3.82 GHz and 5.12 GHz to 5.75 GHz.

The invention has the following advantages:

1. The antenna of the present invention is smaller than a general antenna, and is particularly suitable for use in a wireless communication device having a space limit, such as a notebook computer, a PDA, a 3G mobile phone, and the like.

2. The invention has the advantages of small size and dual frequency function, and is suitable for the frequency band required by WiMAX, and is widely used.

First, referring to the first embodiment, the first embodiment of the present invention is a planar dipole antenna including a single-path parasitic element, which is mainly provided with a microwave substrate (1), and is designed as An FR4 microwave substrate having a rectangular shape of 45 mm long side and 7 mm short side and a thickness of 0.8 mm and a dielectric constant of 4.4.

The first metal strip (2) is formed at the center of the surface of the microwave substrate (1) and perpendicular to the long side of the microwave substrate (1), and is provided with a first end (21) and a second end (22) Extending to the edge of the long side of the microwave substrate (1) to form an elongated rectangular block, the first end (21) extends leftward to the first inductive strip (23), and the second end (22) The second inductive strip (24) extends to the right, wherein the first inductive strip (23) and the second inductive strip (24) have the same length and width and are opposite in position to form an approximately zigzag metal strip.

a second metal strip (3) extending horizontally from the left side of the microwave substrate (1) toward the first metal strip (2) to form an elongated rectangular block and retained with the first metal strip (2) a gap, wherein a right side of the second metal strip (3) is provided with a first contact (31), and the first contact (31) can be a feed point or a ground point.

The third metal strip (4) extends horizontally from the right side of the right side of the microwave substrate (1) toward the first metal strip (2) to form a long rectangular block and is retained with the first metal strip (2) a gap, the length and width of the third metal strip (4) being the same as the length and width of the second metal strip (3), wherein the second metal strip (4) has a second contact on the left side thereof (41) When the first contact (31) is a feed point, the second contact (41) is a ground point, and if the first contact (31) is a ground point, the second contact (41) ) is the feed point.

In use, the 50 ohm coaxial cable (B) is fed with a feeding line (B1) and a grounding line (B2), and the feeding line (B1) is connected thereto. The feed point is electrically connected, and the ground line (B2) is electrically connected to the ground point, and the path of the first inductive strip (23), the second inductive strip (24) and the first metal strip (2) is long. When the sum is 19mm, 21mm, 23mm, respectively, the first resonant frequency is 2.5/2.7GHz, and the reflection loss is compared with the frequency. As shown in the second figure, when the total length is 19mm, it can meet the IEEE 802.11a. /b dual frequency resonance.

A second embodiment of the present invention, as shown in the third figure, is a planar dipole antenna including a multi-path parasitic element, and is mainly provided with a microwave substrate (1A), which is designed to have a long side of 45 mm. Short side 7mm rectangular An FR4 microwave substrate having a thickness of 0.8 mm and a dielectric constant of 4.4.

The first metal strip (2A) is formed at the center of the surface of the microwave substrate (1A) and perpendicular to the long side of the microwave substrate (1A), and is provided with a first end (21A) and a second end (22A) Extending to the edge of the long side of the microwave substrate (1A) to form a long rectangular block, the first end (21A) extends to the right to the third sensing strip (25A), and extends to the left to the first sensing strip. (23A), the second end (22A) extends to the right to the second inductive strip (24A), and the fourth inductive strip (26A) extends to the left, so that the first metal strip (2A) and the third inductive strip ( 25A), the first sensing strip (23A), the fourth sensing strip (26A), and the second sensing strip (24A) form an I-shaped metal strip, wherein the third sensing strip (25A) and the fourth sensing strip ( 26A) has the same length and width, and is opposite in position. The first inductive strip (23A) and the second inductive strip (24A) have the same length and width and are opposite in position, and the first inductive strip (23A) and the second inductive strip (23A) and the second inductive strip (23A) The length and width of 24A) are slightly smaller than the third inductive zone (25A) and the fourth inductive zone (26A).

a second metal strip (3A) extending horizontally from the left side of the microwave substrate (1A) toward the first metal strip (2A) to form an elongated rectangular block and retained with the first metal strip (2A) A gap, wherein a right side of the second metal strip (3A) is provided with a first contact (31A), and the first contact (31A) can be a feed point or a ground point.

a third metal strip (4A) from the right side of the right side of the microwave substrate (1A) The first metal strip (2A) extends horizontally to form a long rectangular block and maintains a gap with the first metal strip (2A). The length and width of the third metal strip (4A) are The second metal strip (3A) has the same length and width, wherein the third metal strip (4A) has a second contact (41A) on the left side thereof, and when the first contact (31A) is a feed point, the first The second contact (41A) is a grounding point. If the first contact (31A) is a grounding point, the second contact (41A) is a feeding point.

In use, the 50 ohm coaxial cable (B) is fed with a feeding line (B1) and a grounding line (B2), and the feeding line (B1) is connected thereto. The feeding point is electrically connected, and the grounding wire (B2) is electrically connected to the grounding point, and the I-shaped metal strip is coupled with the second metal strip (3A) and the third metal strip (4A) and resonates The outband is such that the antenna generates two resonant modes. When the sum of the path lengths of the first sensing strip (23A), the second sensing strip (24A), and the first metal strip (2A) is 21 mm, the third sensing strip When the sum of the path lengths of the (25A), the fourth sensing strip (26A) and the first metal strip (2A) is 29 mm, the antenna is in the operating frequency bands of 2.50 to 3.82 GHz and 5.12 to 5.75 GHz, and the antenna includes two frequency bands. For dual-band operation in WiMAX three-band (2.5~2.7GHz, 3.3~3.8GHZ and 5.15~5.825GHz), please refer to the fourth figure, which is the first sensing strip (23A) and the second sensing strip (for this antenna). 24A) and the first metal strip (2A) path length sum is 27mm, 29mm, 31mm, respectively, the reflection loss corresponds to the operating frequency comparison chart; please refer to the fifth figure, is the first embodiment and the second implementation For example, a comparison chart between actual measurement and simulation.

Please refer to the sixth figure and the seventh figure, which is the second embodiment. At 2.5 GHz, the measured and simulated far-field radiation field patterns are the results of the XY plane and the YZ plane, respectively. In addition, as shown in the eighth and ninth diagrams, the second embodiment is measured and simulated at 5.5 GHz. The far field radiation field pattern is the result of the XY plane and the YZ plane, respectively.

Please refer to the tenth figure, which is the measured and simulated antenna gain change diagram of the second embodiment at 2.5~3.8GHz, and the gain variation is 1.04~2.06dBi; in addition, as shown in the eleventh figure, It is the measured and simulated antenna gain variation diagram of the second embodiment at 5.1~5.8GHz, and the gain variation is 0.68~2.96dBi.

In summary, the present invention successfully designs a printed dipole antenna containing dual-path parasitic elements for dual-frequency operation, which has an operating frequency agreed by WiMAX, and can be well verified in the actual measurement and simulation of the antenna research. It has a small area, good radiation pattern and radiation characteristics.

(1)‧‧‧Microwave substrate

(2) ‧‧‧First metal strip

(21) ‧ ‧ first end

(22) ‧‧‧ second end

(23)‧‧‧First sensor belt

(24)‧‧‧Second sensor belt

(3) ‧‧‧Second metal strip

(31) ‧ ‧ first contact

(4) ‧‧‧ Third metal strip

(41)‧‧‧second junction

(B) ‧‧50 ohm coaxial cable

(B1)‧‧‧Feeding line

(B2)‧‧‧ Grounding wire

(1A)‧‧‧Microwave substrate

(2A)‧‧‧First metal strip

(21A) ‧ ‧ first end

(22A) ‧‧‧ second end

(23A)‧‧‧First sensor belt

(24A)‧‧‧Second sensor belt

(25A)‧‧‧The third sensor belt

(26A)‧‧‧Fourth sensor belt

(3A)‧‧‧Second metal strip

(31A) ‧ ‧ first contact

(4A)‧‧‧ Third metal strip

(41A) ‧‧‧second junction

The first figure is a schematic view of the configuration of the first embodiment of the present invention.

The second figure is a schematic diagram of the effect of changing the path on the return loss according to the first embodiment of the present invention.

The third figure is a schematic view showing the configuration of the second embodiment of the present invention.

The fourth figure is a schematic diagram of the effect of changing the path on the return loss according to the second embodiment of the present invention.

The fifth figure is a comparison diagram of the actual measurement and the simulation of the first embodiment and the second embodiment of the present invention.

The sixth figure is a schematic diagram showing the results of the measured and simulated far-field radiation pattern on the XY plane at 2.5 GHz according to the second embodiment of the present invention.

The seventh figure is a schematic diagram showing the results of the measured and simulated far-field radiation pattern at the YZ plane at 2.5 GHz according to the second embodiment of the present invention.

The eighth figure is a schematic diagram showing the results of the measured and simulated far-field radiation pattern on the XY plane at 5.5 GHz according to the second embodiment of the present invention.

The ninth figure is a schematic diagram showing the results of the measured and simulated far-field radiation pattern at the YZ plane at 5.5 GHz according to the second embodiment of the present invention.

The tenth figure is a graph showing the measured gain of the antenna measured and simulated at 2.5 to 3.8 GHz according to the second embodiment of the present invention.

The eleventh figure is a graph showing the measured gain of the antenna measured and simulated at 5.1 to 5.8 GHz according to the second embodiment of the present invention.

(1A)‧‧‧Microwave substrate

(2A)‧‧‧First metal strip

(21A) ‧ ‧ first end

(22A) ‧‧‧ second end

(23A)‧‧‧First sensor belt

(24A)‧‧‧Second sensor belt

(25A)‧‧‧The third sensor belt

(26A)‧‧‧Fourth sensor belt

(3A)‧‧‧Second metal strip

(31A) ‧ ‧ first contact

(4A)‧‧‧ Third metal strip

(41A) ‧‧‧second junction

(B) ‧‧50 ohm coaxial cable

(B1)‧‧‧Feeding line

(B2)‧‧‧ Grounding wire

Claims (12)

A planar dipole antenna comprising a single-path parasitic element includes: a microwave substrate, which is a rectangular parallelepiped having a long side and a short side; and a first metal strip formed at a center of the microwave substrate and adjacent to one side of the microwave substrate Vertically, the first end and the second end are respectively extended to the microwave substrate to form a long rectangular block. The first end extends leftward to the first sensing strip, and the second end extends to the right. The second inductive strip forms a metal strip of approximately zigzag shape; the second metal strip extends horizontally from the left side of the microwave substrate to the first metal strip to form an elongated rectangular block, wherein the second metal strip The third end of the metal strip extends horizontally from the right side of the microwave substrate to the first metal strip to form a long rectangular block, wherein the left end of the third metal strip is Two contacts; the first contact is a feed point, and the second contact is a ground point, or the first contact is a ground point, and the second contact is a feed point. A planar dipole antenna comprising a single-path parasitic element according to claim 1, wherein the microwave substrate is an FR4 microwave substrate having a length of 45 mm, a width of 7 mm, a thickness of 0.8 mm, and a dielectric constant of 4.4. A planar dipole antenna comprising a single-path parasitic element according to claim 1, wherein the first metal strip is perpendicular to a long side of the microwave substrate. A planar dipole antenna comprising a single-path parasitic element according to claim 1, wherein the length and width of the second metal strip are the same as the length and width of the third metal strip. A planar dipole antenna including a single-path parasitic element as described in claim 1 is connected to the ground point and the feed point using a 50 ohm coaxial cable. The planar dipole antenna including the single-path parasitic element according to claim 1, wherein when the total length of the first metal strip, the first inductive strip and the second inductive strip is 19 mm, the operating frequency band is 2.5GHz~2.7GHz and 5.47GHz~5.79GHz. A planar dipole antenna comprising a dual-path parasitic element includes: a microwave substrate, which is a rectangular parallelepiped having a long side and a short side; and a first metal strip formed at a center of the microwave substrate and adjacent to one side of the microwave substrate Vertically, the first end and the second end are respectively extended to the edge of the microwave substrate to form a long rectangular block. The first end extends to the right to the third inductive strip, and the first inductive strip extends to the left. Its second end extends to the left A fourth inductive strip is extended, and the second inductive strip is extended to the right, so that the first metal strip, the third inductive strip, the first inductive strip, the fourth inductive strip, and the second inductive strip form an approximate I-shaped metal strip a second metal strip extending horizontally from the left side of the microwave substrate to the first metal strip to form an elongated rectangular block, wherein the right end of the second metal strip is a first contact; the third metal strip And extending from the right side of the microwave substrate to the first metal strip to form a long rectangular block, wherein the left end of the third metal strip is a second contact; the first contact is a feed Point, the second contact is a ground point, or the first contact is a ground point, and the second contact is a feed point. A planar dipole antenna comprising a dual path parasitic element according to claim 7, wherein the microwave substrate is an FR4 microwave substrate having a length of 45 mm, a width of 7 mm, a thickness of 0.8 mm, and a dielectric constant of 4.4. A planar dipole antenna comprising a dual path parasitic element according to claim 7, wherein the first metal strip is perpendicular to a long side of the microwave substrate. A planar dipole antenna comprising a dual path parasitic element according to claim 7, wherein the length and width of the second metal strip are the same as the length and width of the third metal strip. A planar dipole antenna including a dual-path parasitic element according to claim 7 is connected to the grounding point and the feeding point by using a 50 ohm coaxial cable. The planar dipole antenna including the dual path parasitic element according to claim 7, wherein the total length of the first metal strip, the third inductive strip and the fourth inductive strip is 29 mm, the operating frequency band is 2.5GHz~3.82GHz and 5.12GHz~5.75GHz.