TWI491111B - Monopole antenna - Google Patents

Description

Single polarized antenna

The present invention relates to an antenna, and more particularly to a single-polarized antenna applied to a portable wireless communication device.

With the rapid development of wireless communication technology and information processing technology, mobile wireless communication devices such as mobile phones and personal digital assistants (PDAs) are competing to enter and reach thousands of households, so that consumers can enjoy high anytime and anywhere. The convenience brought by technology makes these portable wireless communication devices become an indispensable part of modern people's daily life.

Among these wireless communication devices, an antenna device for transmitting and receiving radio waves to transmit and exchange radio data signals is undoubtedly one of the most important components in a wireless communication device. Single-polarized antennas are widely used in wireless communication devices as the life cycle of wireless communication devices has become shorter and the development time of wireless communication devices has become shorter and shorter. However, the conventional single-polarized antenna has a large response during use, is not easy to adjust, and is not highly versatile.

In view of this, it is necessary to provide a single-polarized antenna that is easy to adjust and has high versatility.

A single-polarized antenna disposed in a wireless communication device for transmitting and receiving radio waves to transmit and exchange radio data signals; the single-polarized antenna is made of metal The sheet is bent and includes a main body, a signal feeding portion, a grounding portion, a first radiator and a second radiator; the main body is a sheet body bent into an "L" shape. The base portion and the bent portion are perpendicular to the plane of the bent portion; the signal feeding portion and the ground portion are oppositely disposed at both ends of the base portion of the main body and are The bending portion is located on the same side, and the distance between the signal feeding portion and the ground portion can be adjusted to meet different wireless communication environments; the first radiator and the second radiator are respectively a high frequency a path and a low frequency path, wherein the first radiator extends outward from a central portion of one side of the base portion and is bent toward a side away from the bent portion, and the second radiator is formed by an end of the bent portion The bending is formed toward the first radiator, and is perpendicular to the plane of the base portion.

Compared with the prior art, the single-polarized antenna is formed by bending a metal sheet, and the distance between the signal feeding portion and the ground portion can be adjusted to meet the requirements of application in different wireless communication environments. The single-polarized antenna has a simple structure, a small response during use, is easy to adjust, and has strong versatility, and can be used for three communication systems of GSM, DCS and PCS.

30‧‧‧Single-polarized antenna

31‧‧‧ Subject

311‧‧‧Base Department

313‧‧‧Bends

33‧‧‧Signal Feeding Department

35‧‧‧ Grounding Department

37‧‧‧First radiator

39‧‧‧Second radiator

1 is a perspective view of a preferred embodiment of a single-polarized antenna of the present invention.

2 is a perspective view of another perspective view of a preferred embodiment of a single-polarized antenna of the present invention.

3 is a view showing the electromagnetic radiation pattern measured when the distance between the signal feeding portion of the single-polarized antenna and the ground portion is 14 mm.

4 is a view showing electromagnetic field patterns measured when the distance between the signal feeding portion of the single-polarized antenna and the ground portion is 10.5 mm.

Fig. 5 is a view showing the electromagnetic radiation pattern measured when the distance between the signal feeding portion of the single-polarized antenna and the ground portion is 7 mm.

Fig. 6 is a view showing the electromagnetic radiation pattern measured when the distance between the signal feeding portion of the single-polarized antenna and the ground portion is 3.5 mm.

Referring to FIG. 1 and FIG. 2, the single-polarized antenna 30 of the present invention is a three-dimensional antenna formed by bending a metal sheet, and is disposed on a mobile phone, a personal digital assistant (PDA), and the like. The communication device (not shown) is configured to transmit and receive radio waves to transmit and exchange radio data signals.

As shown in FIG. 2 , the single-polarized antenna 30 includes a main body 31 , a signal feeding portion 33 , a grounding portion 35 , a first radiator 37 , and a second radiator 39 . The main body 31 is a sheet-like body that is bent into a substantially "L" shape, and includes a base portion 311 and a bent portion 313. The plane of the base portion 311 is substantially perpendicular to the plane of the bent portion 313. The signal feeding portion 33 and the ground portion 35 are substantially cylindrical, and are disposed opposite to each other at the both ends of the base portion 311 of the main body 31 and on the same side as the bent portion 313. The distance between the signal feeding portion 33 and the grounding portion 35 can be adjusted according to actual needs to meet the application in different wireless communication environments. The distance between the signal feeding portion 33 and the grounding portion 35 is preferably 1/4 λg of the GSM communication system to 1/2 λg of the DCS or PCS communication system, where λg=(C/4f), C is the speed of light, and f is the work. frequency. In addition, the matching characteristics of the antenna in the electromagnetic radiation pattern can also be used to make the single-polarized antenna 30 be used in different wireless communication environments to shorten the development time and cost to achieve the standardization of the antenna.

The first radiator 37 is a high frequency path which is substantially in the shape of an "L". The first radiator 37 extends outward from the central portion of the base portion 311 side and faces away from The bent portion 313 is formed to extend on one side and on the same plane as the base portion 311. During use, an impedance matching can be generated by adjusting the distance between the signal feeding portion 33 and the ground portion 35. The second radiator 39 is a low frequency path which is a "U" shaped sheet body which is bent into a substantially curved shape. The second radiator 39 is formed by bending the end of the bent portion 313 toward the first radiator 37 and is located on the same side as the first radiator 37. The second radiator 39 is perpendicular to the plane of the base portion 311.

When the single-polarized antenna 30 is in operation, the RF signal is transmitted from the signal feeding portion 33, and can be respectively transmitted along the first radiator 37 and the second radiator 39 of the single-polarized antenna 30 and respectively obtain different lengths of propagation. Path to obtain different high frequency signals and low frequency signals respectively.

Please refer to FIG. 3 to FIG. 6 together, and the electromagnetic radiation pattern measured when the distance between the signal feeding portion 37 of the single-polarized antenna 30 and the ground portion 39 is 14 mm, 10.5 mm, 7 mm, and 3.5 mm, respectively. Figure. It can be seen from the test results that the bandwidth of the single-polarized antenna 30 can cover three communication systems of GSM, DCS and PCS. As the distance between the signal feeding portion 37 and the grounding portion 39 is continuously reduced, the monopole The bandwidth produced by the antenna 30 is also continuously reduced.

The single-polarized antenna 30 is formed by bending a metal sheet, and the distance between the signal feeding portion 33 and the ground portion 35 can be adjusted to meet different wireless communication environments. The single-polarized antenna 30 has a simple structure, a small response during use, is easy to adjust, and has strong versatility, and can be used for working under three communication systems of GSM, DCS and PCS.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above is only a preferred embodiment of the present invention, and the scope of the present invention is not above The equivalents of the embodiments of the present invention are intended to be within the scope of the following claims.

30‧‧‧Single-polarized antenna

31‧‧‧ Subject

311‧‧‧Base Department

313‧‧‧Bends

33‧‧‧Signal Feeding Department

35‧‧‧ Grounding Department

37‧‧‧First radiator

39‧‧‧Second radiator

Claims (4)

A single-polarized antenna is disposed in a wireless communication device for transmitting and receiving radio waves to transmit and exchange radio data signals; and the improvement is that the single-polarized antenna is formed by bending a metal sheet, The utility model comprises a main body, a signal feeding part, a grounding part, a first radiator and a second radiator; the main body is a sheet body bent into an "L" shape, and comprises a base part and a a curved portion, the plane of the base portion is perpendicular to a plane of the bent portion; the signal feeding portion and the ground portion are oppositely disposed at opposite ends of the base portion of the main body and are located on the same side as the bent portion The distance between the signal feeding portion and the grounding portion can be adjusted to be applied to different wireless communication environments; the first radiator and the second radiator are respectively a high frequency path and a low frequency path, The first radiator extends outward from a central portion of the base portion and is bent away from a side away from the bent portion, and the second radiator extends from the end of the bent portion toward the first radiator. Folded and vertical On the plane where the base is located. The single-polarized antenna according to claim 1, wherein the first radiator has an "L"-shaped sheet shape and is located on the same plane as the base portion. The single-polarized antenna according to claim 2, wherein the second radiator is a U-shaped sheet bent into an arc and is located on the same side as the first radiator. The single-polarized antenna according to claim 3, wherein the distance between the signal feeding portion and the ground portion is preferably 1/4 λg of the GSM communication system to 1/2 λg of the DCS or PCS communication system.