CN102881996B - Printed antenna - Google Patents

Abstract

The invention discloses a printed antenna, which comprises a substrate, a first ground plane, a low-frequency radiation part, a high-frequency radiation part, a first matching part and a second matching part. The first ground plane, the low-frequency radiation part, the high-frequency radiation part and the first matching part are positioned on the upper surface of the substrate. The low-frequency radiating portion is connected with the high-frequency radiating portion, and the first matching portion extends from the first ground surface to the high-frequency radiating portion. The second matching part is adjacent to the first matching part and does not overlap with the first matching part.

Description

printed antenna

technical field

The invention relates to a printed antenna, and in particular to a printed antenna applied to a wireless network device.

Background technique

With the advancement of computer and wireless communication technology, Wireless Area Network (WLAN) has gradually been widely used in daily life. At present, many electronic devices can be connected to a wireless local area network through a wireless network device. The wireless network device is, for example, a universal serial bus wireless network card (USB dongle), a wireless base station (Access Point, AP) or a router (Router)

Traditional wireless network devices can transmit and receive wireless signals through an external dipole antenna. Since the external dipole antenna will destroy the overall aesthetics of the appearance and require additional purchase costs, the printed antenna formed on the printed circuit board has gradually replaced the dipole antenna.

However, the radiation gain and radiation performance of traditional printed antennas are far inferior to those of dipole antennas. In addition, the bandwidth of traditional printed antennas is mostly limited to a narrow range.

Contents of the invention

The invention relates to a printed antenna, which can not only reduce the area occupied by the printed antenna on the substrate, but also improve the radiation gain and radiation efficiency through proper circuit layout design. In addition, the bandwidth of the printed antenna can be increased.

According to an aspect of the present invention, a printed antenna is proposed. The printed antenna includes a substrate, a first ground plane, a low frequency radiation part, a high frequency radiation part, a first matching part and a second matching part. The substrate includes an upper surface and a lower surface opposite to the upper surface. The first ground plane, the low frequency radiation part, the high frequency radiation part and the first matching part are located on the upper surface. The first ground plane has a first ground side. The low frequency radiation part includes a first strip-shaped radiation part, a second strip-shaped radiation part and a third strip-shaped radiation part. One end of the second strip-shaped radiating portion is connected to one end of the first strip-shaped radiating portion to form a first bend. One end of the third strip-shaped radiating portion is connected to the other end of the second strip-shaped radiating portion to form a second bend. The first strip-shaped radiating portion, the second strip-shaped radiating portion and the third strip-shaped radiating portion form openings.

The high-frequency radiation part is disposed in the opening, and the high-frequency radiation part includes a first high-frequency side and a second high-frequency side. The first high-frequency side is opposite to the first bend, and one end of the first high-frequency side is connected to the other end of the third strip-shaped radiation portion. The second high-frequency side is parallel to the first strip-shaped radiation part, and one end of the second high-frequency side is connected to the other end of the first high-frequency side to form an acute angle. The first matching part is located on the vertical line between the apex of the acute angle and the first ground side, and the first matching part extends from the first ground side to the first strip-shaped radiation part. The second matching part is adjacent to the first matching part and does not overlap up and down.

In order to make the above content of the present invention more obvious and understandable, the preferred embodiments are specifically cited below, together with the accompanying drawings, and are described in detail as follows:

Description of drawings

FIG. 1 is a partial top view of a printed antenna according to a first embodiment of the present invention.

FIG. 2 is a partial bottom view of the printed antenna according to the first embodiment of the present invention.

FIG. 3 is a waveform diagram of the standing wave ratio of the printed antenna according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating the comparison of the radiation gain of the printed antenna in different measurement planes according to the first embodiment of the present invention.

FIG. 5 is a graph showing radiation efficiency measurements of the printed antenna and the traditional dipole antenna according to the first embodiment of the present invention.

FIG. 6 is a partial top view of a printed antenna according to a second embodiment of the present invention.

FIG. 7 is a partial top view of a printed antenna according to a third embodiment of the present invention.

FIG. 8 is a partial top view of a printed antenna according to a fourth embodiment of the present invention.

FIG. 9 is a partial top view of a printed antenna according to a fifth embodiment of the present invention.

FIG. 10 is a partial top view of a printed antenna according to a sixth embodiment of the present invention.

Explanation of reference signs

1, 2, 3, 4, 5, 6: printed antenna 11: substrate

12: The first ground plane 13: Low frequency radiation part

14, 24, 34, 44: High frequency radiation department 15: First matching department

16: Second matching part 17: Vertical connection

18: The second ground plane 19: The third matching part

111: upper surface 112: lower surface

121: The first ground side 131: The first strip radiation part

132: The second belt-shaped radiation section 133: The third belt-shaped radiation section

134: First bend 135: Second bend

141: First high frequency side 142: Second high frequency side

143: The third high-frequency side 144: The fourth high-frequency side

145: Acute angle 181: Second ground side

510, 520: curve L1, L2, L3, L4: distance

Detailed ways

In order to improve radiation gain and radiation performance, the following embodiments provide various designs of printed antennas. The printed antenna includes a substrate, a first ground plane, a low frequency radiation part, a high frequency radiation part, a first matching part and a second matching part. The substrate includes an upper surface and a lower surface opposite to the upper surface. The first ground plane, the low frequency radiation part, the high frequency radiation part and the first matching part are located on the upper surface. The first ground plane has a first ground side. The low frequency radiation part includes a first strip-shaped radiation part, a second strip-shaped radiation part and a third strip-shaped radiation part. One end of the second strip-shaped radiating portion is connected to one end of the first strip-shaped radiating portion to form a first bend. One end of the third strip-shaped radiating portion is connected to the other end of the second strip-shaped radiating portion to form a second bend. The first strip-shaped radiating portion, the second strip-shaped radiating portion and the third strip-shaped radiating portion form openings.

The high-frequency radiation part is disposed in the opening, and the high-frequency radiation part includes a first high-frequency side and a second high-frequency side. The first high-frequency side is opposite to the first bend, and one end of the first high-frequency side is connected to the other end of the third strip-shaped radiation portion. The second high-frequency side is parallel to the first strip-shaped radiation part, and one end of the second high-frequency side is connected to the other end of the first high-frequency side to form an acute angle. The first matching part is located on the vertical line between the apex of the acute angle and the first ground side, and the first matching part extends from the first ground side to the first strip-shaped radiation part. The second matching part is adjacent to the first matching part and does not overlap up and down.

first embodiment

Please refer to FIG. 1 and FIG. 2 at the same time. FIG. 1 is a partial top view of the printed antenna according to the first embodiment of the present invention, and FIG. 2 is a partial bottom view of the printed antenna according to the first embodiment of the present invention. The printed antenna 1 is, for example, applied to a wireless network device, and the wireless network device is, for example, a USB dongle, a wireless base station (Access Point, AP) or a router (Router). The printed antenna 1 shown in FIG. 1 is placed flat on the x-y plane, and the z direction represents the direction perpendicular to the x-y plane. The printed antenna 1 includes a substrate 11, a first ground plane 12, a low frequency radiation part 13, a high frequency radiation part 14, a first matching part 15, a second matching part 16 and a second ground plane 18, and the printed antenna 1 can be distributed within 18mm ×11mm rectangular area to effectively reduce the occupied area. The substrate 11 includes an upper surface 111 and a lower surface 112 opposite to the upper surface 111 . The first ground plane 12 , the low frequency radiation portion 13 , the high frequency radiation portion 14 and the first matching portion 15 are located on the upper surface 111 , while the second matching portion 16 and the second ground plane 18 are located on the lower surface 112 . The first ground plane 12 and the second ground plane 18 respectively have a first ground side 121 and a second ground side 181 adjacent to the low frequency radiation part 13 and the high frequency radiation part 14 . The low frequency radiation part 13 and the high frequency radiation part 14 operate at 2.4GHz and 5GHz respectively.

The low frequency radiation part 13 includes a first strip radiation part 131 , a second strip radiation part 132 and a third strip radiation part 133 . One end of the second strip-shaped radiating portion 132 is connected to one end of the first strip-shaped radiating portion 131 to form a first bend 134 . One end of the third strip-shaped radiating portion 133 is connected to the other end of the second strip-shaped radiating portion 132 to form a second bend 135 . The first strip-shaped radiation portion 131 , the second strip-shaped radiation portion 132 and the third strip-shaped radiation portion 133 form openings for accommodating the high-frequency radiation portion 14 .

The high-frequency radiation portion 14 is disposed in the opening formed by the first strip-shaped radiation portion 131 , the second strip-shaped radiation portion 132 and the third strip-shaped radiation portion 133 , and the high-frequency radiation portion 14 includes a first high-frequency side 141 , the second high-frequency side 142 , the third high-frequency side 143 and the fourth high-frequency side 144 . The second high-frequency side 142 connects the first high-frequency side 141 and the third high-frequency side 143, and the fourth high-frequency side 144 connects the first high-frequency side 141 and the third high-frequency side 143 to form quadrilateral. The first high-frequency side 141 and the fourth high-frequency side 144 are opposite to the first bend 134 and the second bend 135 respectively, and one end of the first high-frequency side 141 is connected to the end of the third strip-shaped radiation portion 133 another side. The second high-frequency side 142 is parallel to the first strip-shaped radiation portion 131 , and the third high-frequency side 143 is vertically connected to the second high-frequency side 142 . One end of the second high frequency side 142 is connected to the other end of the first high frequency side 141 to form an acute angle 145 .

The first matching portion 15 is located on the vertical line 17 between the apex of the acute angle 145 and the first ground side 121 . The first ground side 121 extends 131 toward the first strip-shaped radiating portion, and the second matching portion 16 extends from the second ground side 181 toward the first strip-shaped radiating portion 131 . The second matching portion 16 is symmetrical and adjacent to the first matching portion 15 , and the second matching portion 16 and the first matching portion 15 are left-right symmetrical and do not overlap up and down. In addition, the size and shape of the second matching portion 16 are the same as that of the first matching portion 15 .

Further, the distance L1 between the first matching portion 15 and the first high-frequency side 141 is 1mm, and the distance L2 between the third high-frequency side 143 and the second strip-shaped radiation portion 132 is 1.5- 2mm. The distance L3 between the third strip-shaped radiating portion 133 and the first ground side 121 is 1 mm, and the distance L4 between the first high-frequency side 141 and the first strip-shaped radiating portion 131 is 3.5-4 mm.

Please refer to FIG. 3 , FIG. 4 and FIG. 5 at the same time. FIG. 3 shows a waveform diagram of the standing wave ratio of the printed antenna according to the first embodiment of the present invention, and FIG. 4 shows the printed antenna according to the first embodiment of the present invention. 5 is a schematic diagram showing the comparison of the radiation gain of the printed antenna and the traditional dipole antenna according to the first embodiment of the present invention. When traditional printed antennas operate at low frequencies, their bandwidth is mostly limited to a narrow range. Differently, it can be seen from FIG. 3 that the above-mentioned printed antenna 1 can obtain a larger bandwidth when operating at a low frequency, such as 1.7GHz˜2.5GHz. Furthermore, the bandwidth of the printed antenna 1 can also be adjusted through the distance L1 between the first matching portion 15 and the first high-frequency side 141 .

In addition, it can also be seen from FIG. 4 that the aforementioned printed antenna 1 has more preferable radiation gain. For example, when the aforementioned printed antenna 1 operates at 2.4GHz, 2.45GHz and 2.5GHz, the peak gains on the x-y plane are 3.49dBi, 3.85dBi and 3.43dBi, respectively. It is obvious that the radiation gain of the printed antenna 1 is greatly improved. Moreover, it can be seen from FIG. 5 that the radiation efficiency of the aforementioned printed antenna 1 is better than that of the traditional dipole antenna. The curve 510 represents the radiation efficiency of the printed antenna 1 at different frequencies, and the curve 520 represents the radiation efficiency of the traditional dipole antenna at different frequencies. When the aforementioned printed antenna 1 operates at 2.4GHz, 2.45GHz and 2.5GHz, the radiation efficiency can reach 95.83%, 94.52% and 97.2%, respectively. Compared with traditional dipole antennas operating at 2.4GHz, 2.45GHz and 2.5GHz, their radiation efficiencies can only reach 84.74%, 88.06% and 92.30%, respectively. Regardless of whether the aforementioned printed antenna 1 operates at 2.4GHz, 2.45GHz or 2.5GHz, its radiation efficiency is better than that of the traditional dipole antenna.

second embodiment

Please refer to FIG. 6 , which is a partial top view of a printed antenna according to a second embodiment of the present invention. The difference between the second embodiment and the first embodiment is that the printed antenna 2 further includes a third matching part 19, the third matching part 19 is located on the upper surface 12 and the second matching part 16 is interposed between the first matching part 15 and the third matching part 19. Between the matching part 19.

third embodiment

Please refer to FIG. 7 , which is a partial top view of a printed antenna according to a third embodiment of the present invention. The difference between the third embodiment and the first embodiment is that the second matching portion 16 of the printed antenna 3 is formed on the upper surface 12, and the second matching portion 16 extends from the first ground side 121 to the first strip-shaped radiation portion 131 extend.

Fourth embodiment

Please refer to FIG. 8 , which is a partial top view of a printed antenna according to a fourth embodiment of the present invention. The difference between the fourth embodiment and the first embodiment is that the high frequency radiation portion 24 of the printed antenna 4 only includes the first high frequency side 141 , the second high frequency side 142 and the third high frequency side 143 . The third high frequency side 143 connects the first high frequency side 141 and the second high frequency side 142 to form a right triangle.

fifth embodiment

Please refer to FIG. 9 , which is a partial top view of a printed antenna according to a fifth embodiment of the present invention. The difference between the fifth embodiment and the first embodiment is that the high frequency radiation portion 34 of the printed antenna 5 only includes a first high frequency side 141 , a second high frequency side 142 and a third high frequency side 143 . The third high-frequency side 143 connects the first high-frequency side 141 and the second high-frequency side 142 to form a triangle, and the third high-frequency side 143 is not parallel to the second strip-shaped radiation portion 132 .

Sixth embodiment

Please refer to FIG. 10 , which is a partial top view of a printed antenna according to a sixth embodiment of the present invention. The sixth embodiment differs from the first embodiment in that the third high-frequency side 143 of the high-frequency radiation portion 44 of the printed antenna 6 is not parallel to the second strip-shaped radiation portion 132 , but is opposite to the first bend 134 .

The printed antenna disclosed in the above embodiments of the present invention has many advantages, and only some of the advantages are listed below:

1. Reduce the area occupied by the printed antenna on the substrate.

2. Improve radiation gain.

3. Improve radiation efficiency.

Fourth, the bandwidth can be increased.

In summary, although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims (13)

1. a printed antenna, comprising:

Substrate, comprising:

Upper surface; And

Lower surface is relative with this upper surface;

First ground plane, is positioned at this upper surface and has the first ground connection side;

Low frequency radiation portion, is positioned at this upper surface, and this low frequency radiation portion comprises:

First banded Department of Radiation;

Second banded Department of Radiation, one end of this second banded Department of Radiation is connected to one end of this first banded Department of Radiation, to form the first bending; And

3rd banded Department of Radiation, one end of the 3rd banded Department of Radiation is connected to the other end of this second banded Department of Radiation, and to form the second bending, this first banded Department of Radiation, this second banded Department of Radiation and the 3rd banded Department of Radiation form opening;

High-frequency radiation part, be positioned at this upper surface and be arranged at this opening, this high-frequency radiation part comprises:

First high frequency side, first bend relative with this, and one end of this first high frequency side is connected to the other end of the 3rd banded Department of Radiation; And

Second high frequency side, is parallel to this first banded Department of Radiation, and one end of this second high frequency side is connected to the other end of this first high frequency side to form acute angle; And

First matching part, is positioned at this upper surface and is positioned in the summit of this acute angle and the vertical join line of this first ground connection side, and this first matching part extends to this first banded Department of Radiation from this first ground connection side; And

Second matching part, adjacent with this first matching part, and not overlapping up and down.

2. printed antenna as claimed in claim 1, also comprise the second ground plane, this second ground plane comprises the second ground connection side, and this second ground plane and this second matching part are formed at this lower surface, and this second matching part extends to this first banded Department of Radiation from this second ground connection side.

3. printed antenna as claimed in claim 2, also comprises the 3rd matching part, the 3rd matching part at this upper surface and this second matching part between this first matching part and the 3rd matching part.

4. printed antenna as claimed in claim 1, wherein this second matching part is formed at this upper surface, and this second matching part extends to this first banded Department of Radiation from this first ground connection side.

5. printed antenna as claimed in claim 1, wherein the size of this second matching part and this first matching part and shape identical.

6. printed antenna as claimed in claim 1, the distance wherein between this first matching part and this first high frequency side is 1mm.

7. printed antenna as claimed in claim 1, wherein this high-frequency radiation part also comprises third high side frequently, this third high frequently side the second high frequency side is vertical is connected with this, and the distance between this third high frequency side and this second banded Department of Radiation is 1.5 ~ 2mm.

8. printed antenna as claimed in claim 7, wherein this high-frequency radiation part also comprises the 4th high frequency side, is connected with this first high frequency side and this third high frequency side.

9. printed antenna as claimed in claim 1, wherein this high-frequency radiation part also comprises third high side frequently, is connected with this first high frequency side and this second high frequency side.

10. printed antenna as claimed in claim 1, wherein this high-frequency radiation part also comprises third high side and the 4th high frequency side frequently, this third high frequently side connects this second high frequency side and the 4th high frequency side, and this third high frequently side and the 4th high frequency side respectively with this first bend and this second bend relative.

11. printed antennas as claimed in claim 1, wherein the distance of the 3rd banded Department of Radiation and this first ground connection side is 1mm.

12. printed antennas as claimed in claim 1, the distance wherein between this first high frequency side and this first banded Department of Radiation is 3.5 ~ 4mm.

13. printed antennas as claimed in claim 1, wherein this second matching part and this first matching part symmetrical.