Multiband Antenna with Parallel Conductive Strip for Compact Wireless Devices
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Solution Overview
Problem
Existing wireless devices face challenges in achieving wide low band and ultra-wide high band coverage with compact, passive antennas, as current solutions either increase cost and complexity with active components or require additional space with separate antennas, leading to SAR issues and increased real estate needs.
Innovation Solution
A multiband antenna design featuring a conductive meander structure with a parallel conductive strip and tabs, coupled to a finite ground plane, which supports frequencies from 690MHz to 960MHz for low bands and 1700MHz to 3000MHz for high bands without requiring active components or additional antennas, maintaining a compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a passive antenna is used to achieve wide low band bandwidth, then the device complexity is reduced, but achieving ultra wide high band coverage becomes impossible
Solution Approach 1:
The patent combines multiple resonant elements (first resonating element, second resonating element, and resonating meanderline) into a single integrated antenna structure. These elements are magnetically and/or capacitive coupled to achieve operation across multiple frequency bands (low band 690-960MHz and high band 1700-3000MHz) using a single passive antenna, eliminating the need for separate antennas or active tuning components.
Solution Approach 2:
The antenna structure is designed to perform multiple functions simultaneously: it provides wide low band bandwidth coverage (690-960MHz) and ultra wide high band coverage (1700-3000MHz) through a single passive multi-resonant structure. The antenna serves as both a low band radiator and a high band radiator without requiring active switching or tuning mechanisms.
2Adaptability or versatility
If two separate antennas are used to cover low bands, then the frequency coverage is improved, but the device real estate and SAR issues worsen
Solution Approach 1:
The patent merges the functionality of two separate low band antennas into a single integrated antenna structure. The bottom antenna (covering 850/900 bands) and top antenna (covering 700 band) are combined into one multi-resonant antenna that provides continuous low band coverage from 690-960MHz, reducing the number of discrete antennas and associated components by 50%.
3Adaptability or versatility
If active solutions (RF switch, tunable capacitors) are used to tune resonance frequency, then the frequency adaptability is improved, but the device complexity and cost increase
Solution Approach 1:
The antenna structure is designed to be self-tuning across multiple frequency bands through its inherent multi-resonant characteristics. The first resonating element, second resonating element, and resonating meanderline naturally resonate at different frequency ranges, eliminating the need for external RF switches, tunable capacitors, or software-controlled tuning mechanisms. The antenna serves itself across the entire frequency range.
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 solution provides efficient coverage across multiple frequency bands with a single antenna, reducing costs, complexity, and SAR risks, while maintaining a slim form factor, achieving significant cost savings and simplified design compared to existing solutions.
Implementation Method 1
An antenna for a wireless device includes a conductive meander structure formed from a plurality of meanders; and a conductive strip connected in parallel to the meander structure and including a plurality of tabs projecting toward the meander structure
Implementation Method 2
The plurality of tabs comprising a first group of tabs connected to a first group of said meanders corresponding to the first group of tabs, the plurality of tabs further comprising a second group of tabs disconnected from a second group of said meanders
Implementation Method 3
One or more of the first resonating element, the second resonating element and the resonating meanderline are coupled by magnetic and/or capacitive coupling to provide operation in the plurality of frequency bands
Data Source
Figure 1~2
Figure 3
Figure 4a~4c
AI summary
An antenna for a wireless device including a meander structure formed from a plurality of meanders and a conductive strip connected in parallel to the meander structure and including a plurality of tabs projecting toward the meander structure, a first group of tabs connected to a first group of meanders corresponding to the first group of tabs, a second group of tabs disconnected from a second group of meanders corresponding to the second group of tabs. In an embodiment, the antenna is incorporated into a wireless device having a transceiver and a finite ground plane.