Antenna Directivity Without Balun Using Coupled Resonators
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Solution Overview
Problem
Conventional antennas require a balun for directivity, which can be space-consuming and limit design flexibility, especially in portable devices where space is a concern.
Innovation Solution
An antenna design that achieves directivity without a balun by using a ground plane, a first resonator, and a second resonator connected through electromagnetic or magnetic coupling, with directors and reflectors arranged to enhance directivity and reduce size, allowing connection to an unbalanced transmission line without a balun.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a balun is used to connect balanced antenna portion and unbalanced transmission line, then directivity can be achieved, but device size increases and design flexibility decreases
Solution Approach 1:
The invention extracts and eliminates the balun component from the antenna system. By using a ground plane as a reflector and configuring resonators with directors, the patent achieves directivity functionality without requiring the balun, thereby reducing device size and improving design flexibility while maintaining the essential directivity capability.
Solution Approach 2:
The invention merges the functions of the balun and reflector into a single ground plane structure. The ground plane simultaneously serves as the reference for the unbalanced transmission line connection and as the reflector for achieving directivity, eliminating the need for separate balun and reflector components.
2Reliability
If a balun is used to connect balanced antenna portion and unbalanced transmission line, then directivity can be achieved, but design flexibility is reduced
Solution Approach 1:
The invention extracts and eliminates the balun component from the antenna system. By using a ground plane as a reflector and configuring resonators with directors, the patent achieves directivity functionality without requiring the balun, thereby reducing device size and improving design flexibility while maintaining the essential directivity capability.
Solution Approach 2:
The ground plane serves multiple functions simultaneously: it acts as the reference ground for the unbalanced transmission line connection, functions as a reflector for achieving directivity, and provides mechanical support for the antenna elements. This multi-functionality eliminates the need for separate balun components and enhances design flexibility.
3Reliability
If conventional antenna design with balun is used, then directivity is achieved, but heat management becomes difficult due to space constraints
Solution Approach 1:
The invention extracts and eliminates the balun component from the antenna system. By using a ground plane as a reflector and configuring resonators with directors, the patent achieves directivity functionality without requiring the balun, thereby reducing device size and improving design flexibility while maintaining the essential directivity capability.
Solution Approach 2:
The patent segments the antenna into distinct functional components (feed resonator, director resonators, ground plane reflector) that can be independently optimized for heat dissipation. This segmentation allows for better thermal management by distributing heat-generating elements across different locations and structures.
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
Enables directivity in a specific direction without a balun, reducing device size, enhancing performance, and improving design flexibility, while allowing for various antenna configurations and materials, including those with low heat resistance for efficient heat management.
Implementation Method 1
a second resonator configured to receive power from the first resonator through electromagnetic coupling or magnetic coupling in a contactless manner
Implementation Method 2
a second resonator configured to receive power from the first resonator through electromagnetic coupling or magnetic coupling in a contactless manner
Implementation Method 3
the ground plane located at a side opposite to the director with respect to the second resonator is used as a reflector
Data Source
AI summary
An antenna includes a ground plane, a first resonator connected to a feeding point for which the ground plane serves as a reference, a second resonator configured to receive power from the first resonator through electromagnetic coupling or magnetic coupling in a contactless manner, at least one director located away from the first resonator and the second resonator, and wherein the ground plane located at a side opposite to the director with respect to the second resonator is used as a reflector, or the antenna further comprises a reflector located at the side opposite to the director with respect to the second resonator.