Apparatus having mushroom structures

Abstract

An apparatus having multiple mushroom structures is disclosed. Each of the multiple mushroom structures includes: a ground plate; a first patch provided parallel to the ground plate with a separation of a distance to the ground plate; and a second patch provided parallel to the ground plate with a separation of another distance to the ground plate, which another distance being different from the distance from the first patch to the ground plate, wherein the second patch is a passive element which is capacitatively coupled with at least the first patch.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to apparatuses having mushroom structures. Such apparatuses can be used not only for a reflector which reflects a radio wave in a specific direction, but also for an antenna at the time of transmitting and receiving a radio wave, a filter which attenuates a specific frequency, etc.[0003]2. Description of the Related Art[0004]In mobile communications, when there is an obstacle such as a building in a path of a radio wave, a received level deteriorates. To this end, there is a technique in which a reflector is provided at an elevation as high as that of the building and in which a reflected wave is transmitted to where the radio wave is hard to reach. When the radio wave is reflected by the reflector, it becomes difficult for the reflector to direct the radio wave in a desired direction if an incident angle of the radio wave within a vertical plane is relative small (FIG. 1). This is because,...

AI Technical Summary

Benefits of technology

[0018]The embodiment as described above of the present invention makes it possible to provide a structure which can be used for an apparatus having a large number of mushroom structures, wherein a range of reflection phase is wide for a predetermined range of structural parameters such as a patch size.

Problems solved by technology

In mobile communications, when there is an obstacle such as a building in a path of a radio wave, a received level deteriorates.

When the radio wave is reflected by the reflector, it becomes difficult for the reflector to direct the radio wave in a desired direction if an incident angle of the radio wave within a vertical plane is relative small (FIG. 1).

However, it is undesirable from a viewpoint of safety to slant to the ground side a reflector which is provided at an elevation as high as that of the building which blocks the radio wave.

However, such a structure becomes significantly large.

However, there is a problem that no matter which of the above schemes is used a range of reflection phase in a given frequency does not cover a wide range.