Multi-Band Antenna Notch Switching for Low-Frequency BHH Performance
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Solution Overview
Problem
Current multi-band antennas in mobile devices face performance degradation due to limited notch structure design, which improves only one frequency band, affecting communication efficiency, especially in free space and beside head and hand states.
Innovation Solution
A multi-band antenna design incorporating multiple notch structures with tunable connections to optimize low-frequency performance, featuring first and second notch structures with adjustable resonance frequencies and switching mechanisms to enhance performance across various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single notch structure is used to improve low-frequency performance, then BHH performance at one frequency band is improved, but performance at other frequency bands deteriorates
Solution Approach 1:
The antenna system is segmented into multiple independent notch structures, each designed to target specific frequency bands. The first notch structure addresses lower frequency bands while the second notch structure addresses higher frequency bands, allowing each segment to optimize performance for its designated frequency range without interfering with other bands.
Solution Approach 2:
The patent implements dynamic switching between different notch structure configurations using switching devices. The system can dynamically activate or deactivate specific notch structures based on the operating frequency band, enabling adaptive optimization of BHH performance across multiple frequency bands rather than being fixed to a single configuration.
2Reliability
If the notch structure length is increased to improve low-frequency performance, then low-frequency BHH performance is improved, but the antenna clearance is reduced
Solution Approach 1:
The patent utilizes the vertical dimension by positioning notch structures at different heights above the ground plane. Instead of only increasing the horizontal length of a single notch structure, the solution places multiple notch structures at different vertical levels, effectively using the third dimension to achieve the required electrical length for low-frequency operation while maintaining adequate horizontal clearance.
Solution Approach 2:
The patent employs nested notch structures where smaller notch structures are positioned within or near larger ones at different vertical levels. This nesting arrangement allows multiple notch structures to coexist in a compact space, achieving the cumulative effect of multiple full-length notches without proportionally increasing the overall antenna footprint.
3Adaptability or versatility
If multiple notch structures are added to improve multi-band performance, then frequency band coverage is improved, but device complexity increases
Solution Approach 1:
The patent designs the antenna system with multi-functional components where the same basic notch structure geometry can serve multiple frequency bands when positioned at different vertical levels. The switching devices also serve dual purposes by controlling both which notch structures are active and which frequency band is currently being operated on, reducing the need for completely separate control mechanisms for each band.
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 design improves communication performance by optimizing both free space and beside head and hand performance, achieving gains in signal strength and reducing amplitude drops, particularly in low-frequency bands.
Implementation Method 1
a first notch structure, where the first notch structure is located on a side of the radiating element and connected to the radiating element in a coupling manner; and a second notch structure, where the second notch structure is located on a side that is of the first notch structure and that is far from the radiating element, and an end that is of the second notch structure and that is far from the radiating element is grounded
Implementation Method 2
the first notch structure may be selectively connected to the ground or to the second notch structure, and when the first notch structure is connected to the second notch structure, the first notch structure is connected to the second notch structure by using a first tuning device
Data Source
AI summary
This application provides a multi-band antenna. The antenna includes a feeder and a radiating element connected to the feeder, and further includes: a first notch structure, where the first notch structure is located on a side of the radiating element and is coupled to the radiating element; and a second notch structure, where the second notch structure is located on a far side of the first notch structure from the radiating element, and a far end of the second notch structure from the radiating element is grounded. The first notch structure may be selectively connected to the ground or to the second notch structure.