Dual-Feed Loop Antenna With Open-Loop Grounding Radiators
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Solution Overview
Problem
Conventional loop antennas with a single feed-in end are insufficient for multiple operating bands, require large ground planes, and face challenges in miniaturization due to space constraints and radiation pattern isolation in electronic devices.
Innovation Solution
A dual-feed loop antenna structure is designed with two loop antennas and two open-loop grounding radiators, where the radiators extend from the ground segments and form a coupling gap, allowing them to function as larger ground paths for impedance matching and providing isolation, enabling operation across multiple frequency bands in a compact space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single feed-in end loop antenna is used, then the structure is simple, but it is insufficient for multiple operating bands
Solution Approach 1:
The antenna is divided into two separate loop antennas, each with its own feed-in end. This segmentation allows each loop to be independently tuned to different frequency bands (2.4 GHz and 5 GHz), enabling multi-band operation while maintaining relatively simple individual structures
Solution Approach 2:
Each loop antenna is designed to support dual-frequency operation by adjusting the length of extension segments, allowing the same basic structure to function across multiple bands. The grounding radiators also serve dual purposes: providing ground paths and creating isolation between antennas
2Reliability
If conventional loop antennas are directly bonded to large ground planes, then grounding is improved, but the space requirement increases
Solution Approach 1:
Instead of expanding the ground plane horizontally (2D expansion), the patent uses vertical stacking of two loop antennas with compact grounding radiators. The grounding radiators extend in specific patterns that provide adequate ground paths without requiring large horizontal space, effectively transitioning from a 2D ground plane approach to a 3D compact structure
Solution Approach 2:
The two loop antennas are positioned in close proximity with their grounding radiators interleaved in a compact arrangement. The grounding radiators of one loop are positioned between the loops of the other, creating a nested-like configuration that maximizes space utilization while maintaining grounding effectiveness
3Volume of moving object
If multiple antennas are placed in limited space, then miniaturization is achieved, but isolation between antennas deteriorates
Solution Approach 1:
Open-loop grounding radiators are positioned between the two loop antennas to serve as intermediary elements. These radiators create electromagnetic coupling that provides isolation between the antennas while maintaining compact dimensions. The coupling gap between the open-loop grounding radiators acts as a controlled intermediary space that manages interference
Solution Approach 2:
The antenna system uses a composite structure combining loop antennas with open-loop grounding radiators. This composite configuration creates electromagnetic coupling effects that provide isolation between the two loops, achieving both miniaturization and interference reduction through the synergistic interaction of different structural elements
4Object-generated harmful factors
If the coupling gap between open-loop grounding radiators is reduced, then isolation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The coupling gap width is optimized to a specific range (0.5-1.5 mm) that balances isolation performance with manufacturing feasibility. This parameter optimization ensures adequate isolation while maintaining reasonable tolerance requirements for mass production. The specific dimension range was determined through electromagnetic simulation and experimental validation
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 dual-feed loop antenna structure achieves good impedance matching, isolation, and omnidirectional radiation patterns, allowing it to resonate effectively across two frequency bands (2.4 GHz and 5 GHz) in a limited space, enhancing the miniaturization and performance of electronic devices.
Implementation Method 1
Each of the loop antennas is configured to resonate at a first frequency band and a second frequency band
Implementation Method 2
a coupling gap is formed between the two open-loop grounding radiators
Data Source
AI summary
A dual-feed loop antenna structure adapted to be disposed on a substrate includes two loop antennas and two open-loop grounding radiators. Each of the loop antennas is used for resonating at a first frequency band and a second frequency band and includes a feed-in end and a ground segment. The two open-loop grounding radiators are located between the two loop antennas. Each of the open-loop grounding radiators extends from the ground segment of the corresponding loop antenna. A coupling gap is formed between the two open-loop grounding radiators. One of the loop antennas and the open-loop grounding radiator connected thereto completely overlap the other loop antenna and the other open-loop grounding radiator connected thereto after being mirrored and reversed. An electronic device is further provided.