3D Antenna Reducing Profile via L-Shaped Segmented Radiator
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Solution Overview
Problem
Conventional planar monopole antennas have a high profile along the axis, making them inefficient for radiation and requiring a large surface area for effective operation, especially when operating within the 400-900 MHz range.
Innovation Solution
A three-dimensional antenna design featuring a substantially L-shaped grounding element and radiating element arranged in a U shape, with a feeding element that includes a short-circuit point and a slot to generate multiple resonant modes, allowing for efficient radiation and reduced profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a conventional planar monopole antenna is used to operate in the 400-900 MHz range, then the radiator length must be 14 cm or more, but this results in a high overall profile greater than 1/4 wavelength
Solution Approach 1:
The patent transitions from a conventional planar monopole antenna to a three-dimensional antenna structure. The radiating element is bent into a three-dimensional shape with multiple segments (first radiating segment, second radiating segment, third radiating segment) arranged in different spatial planes, allowing the antenna to achieve the required electrical length while maintaining a compact overall profile.
Solution Approach 2:
The radiating element is divided into multiple segments (first, second, and third radiating segments) connected at bent points. Each segment contributes to the overall electrical length while the bent connections allow the structure to fold back on itself, reducing the vertical profile while maintaining the necessary resonant length for 400-900 MHz operation.
2Productivity
If the radiator length is increased to achieve efficient radiation at 400-900 MHz, then the operating bandwidth is improved, but the antenna occupies more surface area
Solution Approach 1:
By configuring the radiating element in three-dimensional space with segments bent at different angles and positioned in different planes, the antenna achieves sufficient electrical length for efficient radiation without extending the horizontal footprint. The vertical and lateral dimensions are utilized to accommodate the required radiating length.
Solution Approach 2:
The three-dimensional radiating structure folds back on itself, with segments arranged to occupy overlapping or nested spatial regions when viewed from above, thereby reducing the projected surface area while maintaining the total electrical length necessary for efficient radiation.
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 three-dimensional antenna design achieves efficient radiation with lower voltage standing wave ratios and higher impedance matching across multiple frequency bands, reducing the profile and enhancing radiating efficiency while maintaining effective energy transmission.
Implementation Method 1
The first radiator arm has a first resonant frequency for generating a first resonant mode
Implementation Method 2
The second radiator arm is spaced apart from the first radiator arm by the slot, and has a second resonant frequency for generating a second resonant mode
Data Source
AI summary
A three-dimensional antenna includes an L-shaped grounding element and an L-shaped radiating element. The grounding and radiating elements are arranged in a U shape. The grounding element includes a first grounding segment, a second grounding segment extending from the first grounding segment, and a short-circuit point disposed at the second grounding segment. The radiating element includes a first radiating segment opposite to the first grounding segment, a second radiating segment extending from the first radiating segment and adjacent to the second grounding segment, a feeding point disposed at the second radiating segment, and two radiator arms being able to generate respective resonant frequencies.