Antenna Parasitic Element Front Surface Directivity Design
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Solution Overview
Problem
Existing antenna designs for electric devices, such as televisions, face challenges in maintaining exterior design aesthetics while improving directivity and isolation from other antennas, particularly when mounted on metal housings, as they often require modifications that are impractical or ineffective in reducing internal mutual interference.
Innovation Solution
The proposed antenna configuration includes a radiating element and a parasitic element electromagnetically coupled, with the parasitic element positioned closer to the front surface than the radiating element, allowing for directivity towards the front surface while minimizing the impact on the device's exterior design, and enhancing isolation by positioning the radiating and parasitic elements outside the housing's side surface, thus reducing mutual interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the antenna is mounted on the front surface of the housing, then the directivity to the front surface side is improved, but the exterior design of the electric device is spoiled
Solution Approach 1:
The antenna is positioned in the depth dimension (Z-axis) by extending it beyond the side surface of the housing, rather than placing it on the front surface. This dimensional relocation allows the antenna to achieve front surface directivity while remaining invisible from the front view, thus resolving the contradiction between directivity improvement and exterior design preservation.
2Device complexity
If two antennas are arranged close to each other on the housing, then the device structure is simplified, but the isolation between antennas is reduced
Solution Approach 1:
The antenna extends beyond the side surface of the housing in the depth dimension, creating spatial separation between multiple antennas. This dimensional arrangement allows antennas to be physically close on the housing surface while maintaining adequate isolation through the depth separation, thus resolving the contradiction between structural simplification and antenna isolation.
3Object-affected harmful factors
If the antenna is positioned far from the housing edge, then the isolation from other antennas is improved, but the area available for antenna placement is reduced
Solution Approach 1:
The antenna utilizes the depth dimension by extending beyond the side surface of the housing, allowing the antenna to be positioned close to the housing edge in the planar dimensions while maintaining isolation through depth separation. This effectively increases the available placement area without compromising antenna isolation.
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
This configuration effectively improves directivity towards the front surface, reduces the occurrence of spoiling the exterior design, and enhances isolation between antennas operating in the same frequency band, even when mounted on metal housings, by strategically placing the parasitic element to guide electromagnetic waves and minimize interference.
Implementation Method 1
a parasitic element 6 formed of a conductor and provided (i) near the radiating element 3 so as to be electromagnetically coupled with the radiating element 3
Data Source
Figure 1
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AI summary
Provided is an antenna which is secured to an electric device, reduces the occurrence of spoiling the exterior design of the electric device when viewed from the front surface thereof, and has directivity to the front surface side. An antenna (1) includes: a radiating element (3) that is formed of a conductor and radiates electromagnetic waves when supplied with electrical power; and a parasitic element (6) that is (i) formed of a conductor, (ii) provided near the radiating element (3) so as to be electromagnetically coupled with the radiating element (3), (iii) provided in a plane substantially perpendicular to a plane including the radiating element (3), and (iv) guides the electromagnetic waves without being supplied with electrical power.