JPH02127803A - Film antenna for sticking use - Google Patents

Abstract

PURPOSE:To place the antenna comparatively freely by forming the antenna having a shape to be parted from a support frame of a member to be sticked as the film antenna using a conductive film is parted from a feeding point. CONSTITUTION:The conductive film 2 vapor-deposited or coated on a film sheet 1 being a base to be sticked is the antenna main body. The feeding point 3 leads a signal to a receiver through a feeder. As the antenna 2 is so shaped that as it is parted from the feeding point, it is directed downward. Thus, even if the installation is difficult or impossible due to the external appearance, the object of reception is attained by using the antenna.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is intended for application to automobiles, houses, etc.
This article relates to improving the electrical characteristics of film antennas.

[Prior Art] Conventionally, linear antennas that adhere to glass surfaces have been used as automotive antennas, but now planar antennas using transparent conductive films have been created. Wideband characteristics! 2
Although it is expected that it will become popular due to its ease of installation, the location where it should be pasted or molded becomes a problem because its shape is susceptible to the effects of nearby conductors.

[Problems to be Solved by the Invention] Conventional antennas require precision in the installation position, and there is no freedom in the installation position, so the installation is limited. The main reason for this is that it is greatly influenced by nearby conductors. Therefore, we considered an antenna with a shape that allows it to be installed relatively freely.

[Solution] Taking a general half-wavelength dipole antenna as an example, the impedance is lowest at the feeding point, increases as you move away from the feeding point, and is highest at the tip, where external influences are greatest. receive. Therefore, it seems to be appropriate to consider the shape so that the closer you go to the tip of the antenna, the further away it is from the adjacent conductor.

Operation Description] 1511 is an example of this antenna. 1 in the drawing is a film sheet that becomes the base for pasting. 2
is a conductive film deposited or coated on 1, which is the main body of the antenna. Reference numeral 3 denotes the feed point thereof, and the signal is guided to the receiver via a feed line.

As can be seen from FIG. 1, the antenna 2 is made so as to be directed downward as it moves away from the feeding point. In the case of FIG. 1, it is assumed that the adjacent conductor is located above.

The basic operation of the antenna is similar to that of a general dipole antenna.

[Example] Figure 2 shows the state in which the glass is pasted from the inside of a car.
shows an example of its use in a residential aluminum frame glass window.

In actual viewing in the Tokyo area, the sensitivity and clarity (reflections, etc.) were sufficient for practical use in the area and nearby prefectures.

4. Utility Even in cases where installation is difficult or aesthetically difficult, it is possible to achieve the purpose of reception by using one antenna. Because it is easy to install, it does not require any special skills and can be installed safely (electrically and in terms of construction).

Claims (1)

[Claims] In a film antenna using a conductive film, the distance from the support frame of the material to be attached (glass etc.) increases as the distance from the feeding point increases.
Antenna shaped to extend distance.