Multi-Radiator Antenna with Gaps for Interference Isolation
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Solution Overview
Problem
Existing electronic devices face challenges in isolating different-frequency antennas due to limited space, leading to mutual interference, particularly between cellular communications systems and Wi-Fi systems.
Innovation Solution
The development of a new antenna structure that generates two radiation nulls outside its operating frequency band, achieving a filtering function without altering the radiation characteristic, thereby improving isolation between different-frequency antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple different-frequency antennas are disposed in the electronic device to implement different signal receiving and sending functions, then the signal receiving and sending functions are enhanced, but the isolation between different-frequency antennas deteriorates due to limited space
Solution Approach 1:
The antenna is segmented into multiple radiators (first radiator, second radiator, third radiator) with different lengths, where each radiator is responsible for receiving or sending signals in specific frequency bands. The radiators are arranged side by side in parallel and are respectively connected to the feeding element through first gap and second gap, forming an integrated antenna structure that reduces mutual interference while maintaining multiple signal functions.
Solution Approach 2:
Different radiators have different local characteristics (different lengths) to optimize performance for specific frequency bands. The first radiator has a first length, the second radiator has a second length, and the third radiator has a third length, allowing each segment to be optimized for its designated frequency range while contributing to the overall antenna performance.
2Object-affected harmful factors
If a high-suppression coexistence filter is used to block interfering frequency bands, then the interference between cellular communications system and Wi-Fi system is resolved, but the operating statuses of other components are affected and normal use of the electronic device is impaired
Solution Approach 1:
The harmful interfering signals are extracted and isolated through the specific radiator configuration and gap structure. The first gap and second gap between radiators create natural isolation zones that extract and suppress interfering frequency components (such as GSM1800/1900 spurious interference to GNSS) without requiring external filtering components that would affect other device functions.
Solution Approach 2:
The potential harmful interference between frequency bands is converted into a beneficial filtering effect through the careful design of radiator lengths and gap dimensions. The electromagnetic coupling and decoupling between radiators at different frequencies transforms what would be interference into a self-filtering mechanism that protects both cellular and Wi-Fi operations.
3Object-affected harmful factors
If the antenna structure is modified to improve isolation between different-frequency antennas, then the filtering function is enhanced, but the radiation characteristic of the antenna may be altered
Solution Approach 1:
The antenna structure dynamically adapts to different frequency bands through the coupled radiator configuration. The electromagnetic fields between radiators create frequency-dependent coupling effects that naturally enhance isolation at interfering frequencies while maintaining efficient radiation at operating frequencies, allowing the same structure to serve multiple functions without compromise.
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 solution enhances the anti-interference capability of electronic devices by effectively filtering out interference frequencies, ensuring high efficiency within the operating frequency band and low efficiency outside it.
Implementation Method 1
the first radiator, the second radiator, and the third radiator are spaced from each other side by side in a first direction on a same plane... a first gap is formed between the second radiator and the first radiator, and a second gap is formed between the third radiator and the first radiator
Implementation Method 2
the antenna is capable of generating two radiation nulls outside an operating frequency band of the antenna
Data Source
AI summary
An antenna comprises a feeding element and a plurality of radiators including a first radiator, a second radiator, and a third radiator spaced from each other side by side in a first direction on a same plane. One end of the feeding element is connected to a feeding connection point of the first radiator, and the other end is connected to a feeding point. The antenna further includes a first ground element, a second ground element, a third ground element, and a fourth ground element that are spaced from each other in the first direction. A first gap is formed between the second radiator and the first radiator, and a second gap is formed between the third radiator and the first radiator.