Film antenna and manufacture method thereof
[technical field]
The present invention relates to a kind of film antenna and manufacture method thereof, refer in particular to a kind of film antenna and manufacture method thereof that is used for wireless electron device.
[background technology]
Present existing antenna can be divided into built-in aerial and external antenna usually, wherein the advantage of built-in aerial is to match with electronic installation easily, and its shortcoming is to take the inner space of electronic installation, the trend of incompatibility electronic device miniaturization, and built-in aerial is because of being arranged in the electronic installation, and its gain usually can not take into account with radiation pattern.Then electronic installation is outer to have good antenna gain to external antenna because of being located at, but it generally needs to use the higher antenna material of price with the radio-frequency (RF) signal feed antenna time, and is not easy to cooperate in mechanism, is difficult for making.
Prior art related to the present invention sees also United States Patent (USP) the 6th, shown in 486, No. 837, it discloses a kind of existing film antenna structure, comprise an insulation board and plating conductive film thereon, this film antenna electrically connects by the circuit board of an a pair of contact arm and an electronic installation.Yet, should existing film antenna be by after the insulation board all surface plates thin film, again it being assembled in the electronic installation, so needing more antenna material, the assembling inconvenience, and this film antenna is assembled in the electronic installation, and its gain is good not as external antenna with radiation pattern.In addition, the position can not change again after this film antenna was assembled in the electronic installation, thereby its reception and transmission performance also can't adjust again.
[summary of the invention]
The object of the invention is to provide that a kind of reception is good, transmission performance is good and simple in structure, lower-cost film antenna.
Another purpose of the present invention is to provide a kind of manufacture method of above-mentioned film antenna.
The objective of the invention is to be achieved through the following technical solutions: film antenna of the present invention is located on the electronic installation, and wherein electronic installation comprises the connecting portion of circuit board, insulation crust and at least one flexible connection insulation crust and circuit board.This film antenna then by insulation crust, the connecting portion of electronic installation and be located at insulation crust and connecting portion on conductive film constituted.
The manufacture method of film antenna of the present invention may further comprise the steps:
The first step: ejection formation one insulation crust, this insulation crust is connected by connecting portion with the circuit board of electronic installation;
Second step: on insulation crust surface and connecting portion, plate or stick or spray layer of conductive film.
Compared with prior art, film antenna of the present invention directly is provided with layer of conductive film on the insulation crust of electronic installation, thereby has reduced the spillage of material in the antenna manufacture craft process, and cost is lower, and simple in structure, helps the assembling and the manufacturing of product.In addition, film antenna of the present invention is located on the movable shell, and it is minimum to adjust the dead angle that use angle causes its radiation pattern in use, to realize best reception and transmission performance.
[description of drawings]
Fig. 1 is the three-dimensional exploded view that is assembled with the electronic installation of film antenna of the present invention.
Fig. 2 is the three-dimensional combination figure that is assembled with the electronic installation of film antenna of the present invention.
Fig. 3 is the horizontal polarization electromagnetic radiation field pattern figure that the present invention is operated in 2.45GHz.
Fig. 4 is the perpendicular polarization electromagnetic radiation field pattern figure that the present invention is operated in 2.45GHz.
[embodiment]
Please refer to Figure 1 and Figure 2, film antenna 1 of the present invention is located on the electronic installation 2.This electronic installation 2 comprise insulator 21, circuit board 20, the insulation crust 22 that is connected with circuit board 20 with insulator 21 fixings and be located at insulation crust 22 and circuit board 20 between and with the insulation board 23 of circuit board 20 fixings.Wherein circuit board 20 is provided with electronic circuit and electronic component (not label), be connected by a pair of connecting portion 24 between circuit board 20 and the insulation crust 22, each connecting portion 24 comprises the nut 240 that is fixed on the insulation crust 22, the bolt 241 that cooperates with nut and is fixed on conducting strip 242 on the circuit board 20.Wherein conducting strip 242 is roughly L-shaped, comprise the horizontal part 243 that is fixed on circuit board 20 both sides and perpendicular to the vertical component effect 244 of circuit board 20, and the vertical component effect upper end is provided with through hole 245, and insulation crust 22 and circuit board 20 are rotatably connected.
1 of film antenna comprise insulation crust 22, the connecting portion 24 of electronic installation 2 and be located at insulation crust 22 outer surfaces and connecting portion 24 nuts 240 on conductive film 10.Wherein connecting portion 24 can electrically connect by conducting strip 242 and circuit board 20, so the electronic circuit on film antenna 1 and the circuit board 20 can be electrically connected.In addition, described conductive film 10 can be by existing modes such as plating, spraying or pad pastings attached on insulation crust 22 outer surfaces and the connecting portion 24, and conductive film 10 outer surfaces are also sprayed lacquer (not icon) and are worn in use to prevent it.
Fig. 3 and Fig. 4 are respectively level and the perpendicular polarization electromagnetic radiation field pattern figure of film antenna 1 of the present invention when being operated in the 2.45GHz frequency, by test result as can be known, the average gain of film antenna 1 of the present invention can meet the demands under this operating frequency, there is not tangible dead angle, and the conductive film 10 of film antenna 1 is located on the movable insulation crust 22, the radiation pattern of this film antenna 1 of scalable in use, thus best reception and transmission performance reached.
In the present embodiment, electronic installation 2 is a bluetooth module, and certainly, film antenna 1 of the present invention can change its operating frequency by the shape of adjusting its conductive film 10, thereby it also can be used on other electronic installation that needs antenna, as mobile phone, household electrical appliances and automobile etc.