1. Fields of the Invention
The present invention relates to a dual wideband dipole antenna, especially to a dual wideband dipole antenna used for wireless communication and receiving electromagnetic signals.
2. Descriptions of Related Art
Along with fast development of the wireless communication industry, the wireless communication technology has a huge impact on our lives today. It not only brings great convenience to people's life, but also shortens the distance between people. Thus almost everyone has got at least one mobile phone. The design of the mobile phone focuses on light weight and compact size. Moreover, multiple-bandwidth configuration has replaced a single bandwidth.
Furthermore, there is a trend to develop and research green (renewable) energy technology owing to the rising awareness of environment protection. Solar and wind power are two of the very best natural resources of energy, but both of them have their own disadvantages. For example, there is no power generated if there is a cloudy day or no wind. One of the main disadvantages is that large numbers of solar panels and wind generators are required to produce useful amounts of heat or electricity.
If the electromagnetic energy generated by wireless communication equipment can be collected and converted to electrical energy required, this is beneficial to the development of the green energy. The enormously expensive equipment in solar panels and wind generators can also be saved.
Thus there is a need to provide a novel communication antenna covering the operating bands of GSM850/900/1800/1900 and being able to be fed with electromagnetic energy at the operating bands of GSM850/900/1800/1900 for collecting and converting the electromagnetic energy into electric energy required.
Therefore it is a primary object of the present invention to provide a dual wideband dipole antenna with a resonant frequency of 0.85 GHz, 1.13 GHz, 1.68 GHz, 1.93 GHz and 2.29 GHz and covering GSM frequency bands 850/900/1800/1900, used in wireless communication and for receiving electromagnetic signals.
In order to achieve the above object, a dual wideband dipole antenna of the present invention includes a dielectric substrate, two radiating metal portions and a feed line.
The two radiating metal portions are arranged at the dielectric substrate and are corresponding to each other. Each radiating metal portion is composed of a metal plate, an L-shaped metal piece and a rectangular metal sheet. A feeding point is disposed on an initial end of the metal plate while a regulatory segment is extended and bent from a middle part of the metal plate toward the initial end and a terminal end of the metal plate is bent and turned toward a first direction to form a projecting segment. The L-shaped metal piece is set between the terminal end of the metal plate and the regulatory segment. The L-shaped metal piece further includes a turning portion turning from the terminal end toward a second direction. The rectangular metal sheet is located between the terminal end of the metal plate and a rear end of the regulatory segment of the other metal plate.
The feed line connects the two feeding points respectively on the metal plate of each radiating metal portion.
Thereby the antenna is excited by the rectangular metal sheet to produce resonant frequency at 0.85 GHz. The resonant frequencies at 1.13 GHz and 2.29 GHz of the antenna are excited by the metal plate while the resonant frequency at 1.68 GHz of the antenna is excited by the L-shaped metal piece, the turning portion and the projecting segment. The regulatory segment is used to excite the resonant frequency at 1.93 GHz. Thus the antenna covers operating bands of GSM850/900/1800/1900, etc, able to be used for wireless communication (covering GSM850/900/1800/1900 bands) and receiving electromagnetic signals
In the dual wideband dipole antenna, a slit is formed on one side of the feeding point of the metal plate and is used for IF (intermediate frequency) matching.
In the dual wideband dipole antenna, a slot is mounted on the other side of the feeding point of the metal plate is used for IF (intermediate frequency) matching.
In the dual wideband dipole antenna, the dielectric substrate is a FR4 substrate with a relative permittivity (relative dielectric constant) of 4.4 (∈r=4.4), a loss tangent of 0.0245, a thickness of 0.8 mm and an area of 20×200 mm2.
The structure and the technical means adopted by the present invention to achieve the above and other objects can be best understood by referring to the following detailed description of the preferred embodiments and the accompanying drawings, wherein
a is a schematic drawing showing effect of a rectangular metal sheet on return loss of an antenna according to the present invention;
b is a schematic drawing showing effect of a rectangular metal sheet on input impedance of an antenna according to the present invention;
c is another schematic drawing showing effect of a rectangular metal sheet on input impedance of an antenna according to the present invention;
a is a schematic drawing showing effect of an L-shaped metal piece on return loss of an antenna according to the present invention;
b is a schematic drawing showing effect of an L-shaped metal piece on input impedance of an antenna according to the present invention;
c is another schematic drawing showing effect of an L-shaped metal piece on input impedance of an antenna according to the present invention;
a is a schematic drawing showing effect of a turning portion on return loss of an antenna according to the present invention;
b is a schematic drawing showing effect of a turning portion on input impedance of an antenna according to the present invention;
c is another schematic drawing showing effect of a turning portion on input impedance of an antenna according to the present invention;
a is a schematic drawing showing effect of a metal plate on return loss of an antenna according to the present invention;
b is a schematic drawing showing effect of a metal plate on input impedance of an antenna according to the present invention;
c is another schematic drawing showing effect of a metal plate on input impedance of an antenna according to the present invention;
a is a schematic drawing showing effect of a regulatory segment on return loss of an antenna according to the present invention;
b is a schematic drawing showing effect of a regulatory segment on input impedance of an antenna according to the present invention;
c is another schematic drawing showing effect of a regulatory segment on input impedance of an antenna according to the present invention;
a is a schematic drawing showing effect of a projecting segment on return loss of an antenna according to the present invention;
b is a schematic drawing showing effect of a projecting segment on input impedance of an antenna according to the present invention;
c is another schematic drawing showing effect of a projecting segment on input impedance of an antenna according to the present invention;
a is a schematic drawing showing effect of a slit on return loss of an antenna according to the present invention;
b is a schematic drawing showing effect of a slit on input impedance of an antenna according to the present invention;
c is another schematic drawing showing effect of a slit on input impedance of an antenna according to the present invention;
a is a schematic drawing showing effect of a slot on return loss of an antenna according to the present invention;
b is a schematic drawing showing effect of a slot on input impedance of an antenna according to the present invention;
c is another schematic drawing showing effect of a slot on input impedance of an antenna according to the present invention;
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The dielectric substrate 1 is a FR4 substrate with a relative permittivity (relative dielectric constant) of 4.4 (∈r=4.4), a loss tangent of 0.0245, a thickness of 0.8 mm and an area of 20×200 mm2.
The two radiating metal portions 2 are disposed on the dielectric substrate 1 and are corresponding to each other. The radiating metal portion 2 consists of a metal plate 21, an L-shaped metal piece 22 and a rectangular metal sheet 23. The metal plate 21 has an initial end 211 and a terminal end 212 opposite to the initial end 211. The initial end 211 is disposed with a feeding point 213. A middle part of the metal plate 21 is bent 180 degrees and extended toward the initial end 211 to form a regulatory segment 214 while the terminal end 212 of the metal plate 21 is bent and turned toward a first direction D1 of the dielectric substrate 1 to form a projecting segment 215. In order to increase the IF (intermediate frequency) bandwidth, the L-shaped metal piece 22 is arranged between the terminal end 212 of the metal plate 21 and the regulatory segment 214. The L-shaped metal piece 22 also includes an initial end 221 and a terminal end 222. The initial end 221 is toward a second direction D2 of the dielectric substrate 1 while the terminal end 222 is located at the first direction D1 of the dielectric substrate 1. The second direction D2 and the first direction D1 are opposite to each other. The terminal end 222 of the L-shaped metal piece 22 further is bent and turned toward the second direction D2 to form a turning portion 223. As to the rectangular metal sheet 23, it is arranged at the second direction D2 and located between the terminal end 212 of the metal plate 21 and a rear end of the regulatory segment 214 of the other metal plate 21.
The feed line 3 connects the feeding points 213 respectively on each metal plate 21 of the radiating metal portion 2.
A slit 216 is formed on one side of the feeding point 213 of the metal plate 21 while a slot 217 is mounted on the other side of the feeding point 213. Both the slit 216 and the slot 217 are designed for IF (intermediate frequency) matching. The slit 216 and the slot 217 can be respectively disposed on each of two sides of the feeding point 213 of the metal plate 21 or alternatively on one side of the feeding point 213.
According to the above structure, the antenna is excited by the rectangular metal sheet 23 to produce resonant frequency at 0.85 GHz. The resonant frequencies at 1.13 GHz and 2.29 GHz of the antenna are excited by the metal plate 21 while the resonant frequency at 1.68 GHz of the antenna is excited by the L-shaped metal piece 22, the turning portion 223 and the projecting segment 215. The regulatory segment 214 is used to excite the resonant frequency at 1.93 GHz. Thus the antenna cover operating bands of GSM850(824-894 GHz)/900(890-960 GHz)/1800(1710-1880 GHz)/1900(1850-1990 GHz), etc, able to be used as antenna for wireless communication (covering GSM850/900/1800/1900 bands) and receiving electromagnetic signals.
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Besides the slit 216 used for IF (intermediate frequency) matching, the slot 217 also has similar function. Refer to
Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details, and representative devices shown and described herein. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.