L-Shaped Antenna Element for Wide-Angle Isotropic Radiation
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Solution Overview
Problem
Existing antenna apparatuses struggle to radiate radio waves in directions perpendicular to the substrate surface, limiting their coverage and isotropic radiation characteristics.
Innovation Solution
The antenna apparatus includes a reflective plate and an antenna element that extends perpendicularly from the plate, with specific lengths of the antenna element portions optimized to radiate radio waves in both parallel and perpendicular directions, forming a wide-angle radiation pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the antenna element is configured to radiate radio waves in directions parallel to the substrate surface, then the radiation pattern is enlarged in parallel directions, but the radio wave cannot be strongly radiated in directions perpendicular to the substrate surface
Solution Approach 1:
The antenna element is configured with an L-shape structure that extends in both parallel and perpendicular directions relative to the substrate surface. This dimensional extension allows the antenna to radiate radio waves effectively in multiple directions simultaneously, resolving the contradiction between parallel radiation pattern coverage and perpendicular radiation strength
2Adaptability or versatility
If the antenna element length is optimized for parallel radiation, then wide-angle radiation pattern is achieved, but isotropic radiation characteristics are compromised
Solution Approach 1:
By extending the antenna element in multiple dimensions (parallel and perpendicular to substrate), the antenna achieves wide-angle radiation coverage while maintaining isotropic characteristics through its three-dimensional current distribution
Solution Approach 2:
The antenna element lengths are specifically optimized (first portion: 0.1λg-0.2λg, second portion: 0.2λg-0.4λg) to achieve both wide-angle radiation pattern and isotropic radiation characteristics simultaneously, changing the dimensional parameters to satisfy multiple performance requirements
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 solution enables the antenna apparatus to radiate radio waves in a wide-angle pattern, covering multiple directions effectively, enhancing isotropic radiation characteristics.
Implementation Method 1
an antenna element 4a that extends perpendicularly from the reflective plate 4b... radiates radio waves in a wide-angle radiation pattern
Implementation Method 2
a reflective plate 4b; and an antenna element 4a that extends perpendicularly from the reflective plate 4b
Data Source
AI summary
An antenna apparatus includes: a reflective plate; and an antenna element that extends perpendicularly from the reflective plate and is bent at a right angle. The length of a portion of the antenna element extending perpendicularly from the reflective plate is approximately ¼ of a guide wavelength to be radiated, and the length of a portion of the antenna element bent at a right angle and extending is approximately ¼ or longer and approximately ½ or shorter of the guide wavelength.