Flat-Plate Antenna Shielding for Horizontal Gain Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna devices with a flat plate structure experience reduced gain in the horizontal direction due to the vertical electric field wrapping around the opposing conductive plate, which becomes more pronounced as the distance between the ground plate and the opposing conductive plate decreases.
Innovation Solution
Incorporating a radio wave shielding body made of conductive or dielectric material on the upper side of the opposing conductive plate to restrict the vertical electric field from wrapping around, thereby concentrating the radiation direction horizontally and improving the antenna's gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between the ground plate and the opposing conductive plate is decreased to achieve a more compact antenna design, then the antenna size is reduced, but the gain in the horizontal direction deteriorates due to the vertical electric field wrapping around the opposing conductive plate
Solution Approach 1:
A radio wave shielding body is introduced as an intermediary element positioned between the opposing conductive plate and the surrounding space. This shielding body, made of conductive or dielectric material, acts as a mediator to redirect the vertical electric field that would otherwise wrap around the opposing conductive plate, thereby preventing the loss of horizontal radiation gain while maintaining the compact antenna structure
Solution Approach 2:
The patent modifies the electromagnetic field distribution parameters by introducing the shielding body, which changes the field propagation characteristics. The shielding body alters the boundary conditions for the electric field, transforming the field pattern from one that wraps around the plate to one that is directed horizontally, thus improving gain without increasing antenna volume
2Power
If a radio wave shielding body is added to improve horizontal direction gain by restricting the vertical electric field, then the gain is enhanced, but the device complexity increases
Solution Approach 1:
The radio wave shielding body is designed to serve multiple functions simultaneously: it acts as a reflector for the vertical electric field, provides structural support for the antenna elements, and can be integrated with the housing or mounting structure. This multi-functionality approach allows the shielding body to improve horizontal gain without proportionally increasing device complexity
Solution Approach 2:
The shielding body is made of materials with uniform electromagnetic properties (conductive or dielectric materials with consistent characteristics) to ensure predictable and homogeneous field interaction. This homogeneity simplifies the design and analysis of the shielding effect, reducing the complexity associated with modeling and optimizing heterogeneous material interactions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The implementation of the radio wave shielding body enhances the gain in the horizontal direction of the antenna, achieving results comparable to a ¼ wavelength monopole antenna with a more compact design.
Implementation Method 1
a radio wave shield body for shielding a propagation of an electric field, which is arranged on an upper side of the opposing conductive plate and is made of a conductor or a dielectric material
Implementation Method 2
Parallel resonance at a predetermined target frequency is generated by an inductance provided in the short-circuit portion and a capacitance between the ground plate and the opposing conductive plate
Data Source
AI summary
An antenna device includes: a ground plate made of a conductor with a flat plate shape; an opposing conductive plate made of another conductor with a flat plate shape, arranged to space apart from the ground plate by a predetermined distance, and having a power supply point electrically connected to a power supply line; a short-circuit portion electrically connecting the opposing conductive plate and the ground plate; and a radio wave shield body for shielding a propagation of an electric field, which is arranged on an upper side of the opposing conductive plate and is made of a conductor or a dielectric material. Parallel resonance at a predetermined target frequency is generated by an inductance provided in the short-circuit portion and a capacitance between the ground plate and the opposing conductive plate.