Multiband Wireless Antenna Using CRLH Mode Segmentation
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Solution Overview
Problem
Existing wireless device antennas face limitations in bandwidth, size, and interference from user interactions, particularly when operating in multiple frequency bands or specific radio bands.
Innovation Solution
The design incorporates a combination of low band left-handed (LBLH) and right-handed (LBRH) mode elements, high band left-handed (HBLH) and right-handed (HBRH) mode elements, capacitively and inductively coupled, with tunable capacitive elements to dynamically adjust frequency and impedance, allowing operation across broad frequency bands while maintaining a small physical size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CRLH metamaterial structures are used to expand bandwidth, then frequency range coverage is improved, but bandwidth limitations still persist and device size increases
Solution Approach 1:
The antenna is divided into multiple discrete mode elements (LBLH, LBRH, HBLH, HBRH) that can be independently designed and tuned. Each element operates in specific frequency bands, allowing the overall antenna to cover broad bandwidth through segmentation of the frequency spectrum across multiple specialized components rather than requiring a single large structure
Solution Approach 2:
The patent combines both left-handed and right-handed mode elements in a single antenna structure, merging their complementary frequency response characteristics. This hybrid approach merges the advantages of both metamaterial types to achieve broader bandwidth coverage while maintaining compact dimensions through synergistic interaction of the different mode elements
2Adaptability or versatility
If multiple frequency bands are supported simultaneously, then network versatility is improved, but antenna complexity increases
Solution Approach 1:
The antenna structure is designed with universal multi-functionality by incorporating mode elements that can operate across multiple frequency bands (low band and high band). The same physical structure supports both LBLH/LBRH modes for low band operation and HBLH/HBRH modes for high band operation, allowing a single antenna to serve multiple network requirements without requiring separate specialized antennas for each band
Solution Approach 2:
The antenna incorporates tuning elements that enable dynamic adjustment of resonant frequencies and impedance characteristics. This dynamic capability allows the antenna to adapt its electrical properties to match different frequency bands and operating conditions, simplifying the support for multiple frequency bands by using active tuning rather than complex passive multi-resonator structures
3Adaptability or versatility
If tuning elements are added for dynamic frequency adjustment, then frequency agility is improved, but device complexity increases
Solution Approach 1:
The tuning elements work by changing electrical parameters (capacitance, inductance) of the mode elements to adjust resonant frequencies. Instead of adding complex mechanical or structural adjustment mechanisms, the patent achieves frequency agility through parameter changes in the electrical components, allowing dynamic retuning of the antenna by varying component values such as capacitor capacitance or inductor inductance
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 configuration enables efficient operation in multiple frequency bands with reduced interference, allowing for dynamic tuning and impedance matching, enhancing performance across various networks and environmental conditions.
Implementation Method 1
The LBLH mode element is capacitively coupled to a feed of the antenna
Implementation Method 2
The LBLH mode element is inductively coupled to a ground of the antenna
Implementation Method 3
The tuning element may include a ferroelectric capacitor having a voltage dependent dielectric constant to change a capacitance thereof
Data Source
AI summary
An antenna for a wireless device includes a low band left-handed (LBLH) mode element and a low band right-handed (LBRH) mode element both operable in a low frequency bandwidth and a high band left-handed (HBLH) mode element and a high band right-handed (HBRH) mode element both operable in a high frequency bandwidth. The LBLH mode element is capacitively coupled to a feed of the antenna and is inductively coupled to a ground of the antenna. The LBRH mode element is electrically coupled to the feed of the antenna. The HBLH mode element is capacitively coupled to the feed of the antenna and is inductively coupled to the ground of the antenna. The HBRH mode element is electrically coupled to the feed of the antenna. At least one tuning element is operatively coupled to at least one of the mode elements.