JP2536532Y2 - Microstrip antenna - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microstrip antenna, and more particularly to an antenna whose antenna characteristics are not affected by the antenna installation location.

[0002]

2. Description of the Related Art Conventionally, a microstrip antenna of this type has a radiation conductor 1, a dielectric 2 provided below the radiation conductor 1, and a ground conductor provided below the dielectric 2 , as shown in FIG. 3 is small and thin and lightweight, so that it is relatively easy to select an installation place. However, since the ground conductor 3 is not sufficiently large with respect to the radiation conductor 1, the reflector under the antenna is required. Was greatly affected. In addition, the dielectric 2 is sufficient for the radiation conductor 1.
If it is not large enough, the electromagnetic field will be
Since the leak rate increases, the lower the angle of elevation, the
Be more susceptible. In particular, there is a reflector under the antenna
There is also a tendency for the gain to decrease due to non-propagation of horizontal polarization.
You.

[0003] For this reason, it is difficult to select the installation location of the antenna, and the actual installation location is a factor that affects the antenna performance. If the antenna design is performed on the assumption that the reflector is present under the antenna, there is a disadvantage that the desired antenna performance cannot be obtained when the antenna is installed in a place without the reflector.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems. In order to solve the above-mentioned problems, a radiating conductor, a dielectric provided under the radiating conductor, and a dielectric provided below the dielectric are provided. And a reflection buffer of substantially the same size or larger than the ground conductor is provided under the ground conductor.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a first embodiment of the microstrip antenna of the present invention, which comprises a hollow dielectric 4 made of a dielectric material and a slightly larger high dielectric 5 made of a high dielectric material provided thereunder. . The reflection buffer 10 is placed below the microstrip antenna shown in FIG.
Is set equal to or slightly larger than the size of the ground conductor 3. The material of the dielectric 4 is desirably composed of acrylic, urethane, bakelite, or the like.

In FIG . 1, a microstrip antenna is shown.
When the dielectric 4 is placed under the antenna, the electric wave is caused by the slow wave effect of the dielectric.
Because the magnetic field is pulled back, there is less leakage. High dielectric
Numeral 5 indicates an electromagnetic field caused by a change in the dielectric constant of the dielectric 4.
Microstrip antenna
The operation as a single unit becomes stable. This allows the effects of disturbance
Therefore, even if a metal reflector exists under the microstrip antenna, the characteristics are not deteriorated at a low elevation angle, and good characteristics can be obtained even when the distance between the reflector and the microstrip antenna changes.

FIG. 2 shows an embodiment in which the reflection buffer 11 comprises a hollow dielectric 4 and a metal foil 6 wound on the outer periphery thereof. The size of the reflection buffer 11 is the same as that described with reference to FIG.

FIG. 3 shows an embodiment in which the reflection buffer 12 comprises a hollow metal ring 7. In FIG.
The polarization current in the dielectric 2 flows along the surface of the metal ring 7
As the direction of the current changes, the discharge is performed in the same manner as in FIG.
The electromagnetic field in a direction parallel to the radiation conductor 1 is pulled back, and
Less. The effect of the high dielectric 5 is the same as in FIG.
You. The metal foil 6 in FIG. 2 is equivalent to the metal ring 5 in FIG.
The operation principle is the same as that of FIG.

FIG. 4 shows a reflection buffer 1 as shown in FIG.
Over 1 shows an actual example of a case of mounting the microstrip en <br/> Te Na as shown in FIG. The reflection buffer is not limited to that of FIG . 2, but may alternatively be of the embodiment shown in FIGS.

[0010]

[Effects of the Invention] As described above, according to the present invention, the influence of the presence or absence of the reflector under the microstrip antenna is hardly affected, so that the degree of freedom for selecting the installation location of the antenna increases. For example, it can be installed on a car spoiler, or on a roof or trunk of a car whose body is not made of metal.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a reflection buffer in a microstrip antenna of the present invention.

FIG. 2 is a perspective view showing another embodiment of the reflection buffer in the microstrip antenna of the present invention.

FIG. 3 is a perspective view showing another embodiment of the reflection buffer in the microstrip antenna of the present invention.

FIG. 4 is a perspective view showing another embodiment of the reflection buffer in the microstrip antenna of the present invention.

FIG. 5 is a plan view and a schematic side view showing a configuration of a conventional microstrip antenna.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Radiation conductor 2 Dielectric 3 Ground conductor 4 Dielectric 5 High dielectric 6 Metal foil 7 Metal ring 10, 11, 12 Reflection buffer

Claims (4)

(57) [Scope of request for utility model registration] 1. A microstrip antenna comprising a ground conductor provided on the lower side of the radiating conductor and the dielectric provided on its lower and its dielectric, the prior SL grounding conductor and substantially the same size or than Large hollow dielectric
A microstrip antenna , wherein a body is provided as a reflection buffer under the ground conductor. 2. The method according to claim 1, wherein the outside of the hollow dielectric is provided.
It is characterized by providing a metal foil on the circumference to make it a reflection buffer
Microstrip antenna. 3. The method according to claim 1, wherein said hollow dielectric is replaced.
The metal ring is used as a reflection buffer.
Cross strip antenna. Wherein any smell of claims 1 to 3
A high dielectric material larger than the reflection buffer
Microstrip characterized by being placed under a vessel
antenna.