Antenna device
An antenna device and antenna technology, which is applied to resonant antennas, mid-position feeding between antenna terminals, and slender active unit end feeding, etc. The effect of improving constancy
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no. 1 approach 》
[0032] [Structure of Antenna Device]
[0033] refer to Figure 1 ~ Figure 3 The configuration of the antenna device 1 according to the first embodiment of the present invention will be described. figure 1 It is a perspective view of the antenna device 1 . figure 2 (a) is a perspective view of the upper surface side of the support body 30 included in the antenna device 1, figure 2 (b) is a perspective view of the lower surface side of the support body 30 . image 3 It is a plan view of the film antenna 10 included in the antenna device 1 .
[0034] In addition, in this specification, regarding "up, down, left, right, front, and rear" of the antenna device, according to the xyz coordinate system of each drawing, "z-axis positive direction is up", "z-axis negative direction The direction is down", "the positive direction of the y-axis is right", "the negative direction of the y-axis is left", "the positive direction of the x-axis is back", and "the negative direction of the...
no. 2 approach 》
[0115] Next, an antenna device 1α according to the second embodiment will be described.
[0116] As described above, the antenna device 1 described in the first embodiment can be mounted, for example, on the body of an automobile. However, depending on the mounting method, it is considered that the end of the film antenna 10 vibrates due to wind and generates noise such as wind noise. Condition. In addition, when the end portion of the film antenna 10 continues to receive wind, it is also considered that the end portion is deformed.
[0117] Therefore, the antenna device 1α according to the second embodiment is an antenna device whose further purpose is to prevent the occurrence of such noise and deformation.
[0118] Below, refer to Figure 8 ~ Figure 10 An antenna device 1α according to the second embodiment will be described. In addition, the same reference numerals are assigned to the same components as those of the antenna device 1 of the first embodiment, and descript...
no. 1 example 〕
[0139] Next, refer to Figure 12 A first embodiment of the antenna device 1 will be described. Figure 12 It is a graph showing the frequency dependence of the VSWR and the average gain of the antenna device 1 of the first embodiment.
[0140] The antenna device 1 of the first embodiment adopts the height of the support body 30 (in figure 1 In the illustrated coordinate system, the length in the z-axis direction) is 17.0 mm, the radius of the coaxial cable 20 is 1.4 mm, and the distance D1 and the distance D2 are both 8.5 mm. That is, the antenna device 1 of the present embodiment employs a structure of D2 = D1. In addition, the film antenna 10 included in the antenna device 1 of this embodiment is designed to obtain preferable radiation characteristics in the 800 MHz band.
[0141] refer to Figure 12 From the illustrated VSWR curves, it can be seen that the antenna device 1 of the first embodiment exhibits a VSWR of less than 2 in the 800 MHz band and a sharp increase in...
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