Dual Antenna Shared Substrate Band Isolation
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Solution Overview
Problem
Existing dual antenna designs for small-sized radio devices face challenges in minimizing space and production costs while maintaining optimal performance across multiple frequency ranges, as they require additional matching components that increase size and cost, and often compromise on the upper resonance band.
Innovation Solution
A multiband antenna design featuring a shared dielectric substrate with partial antennas having a shared feed point and conductor, utilizing short-circuit points and conductors to improve matching and isolation between bands without degrading performance, allowing for efficient operation across both lower and upper operating bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate antenna components are used for different frequency bands, then isolation between bands is improved, but device size and complexity increase
Solution Approach 1:
The patent combines multiple antenna functions into a single integrated antenna structure that operates across multiple frequency bands (e.g., 700 MHz, 800 MHz, 900 MHz, 1800 MHz, 1900 MHz, 2100 MHz, 2300 MHz, 2600 MHz) without requiring separate antenna components for each band, thereby reducing overall antenna size while maintaining band isolation through careful design of the radiating element geometry and feed network
Solution Approach 2:
The antenna is designed as a universal multi-band structure where a single radiating element and feed system serve multiple frequency bands simultaneously, eliminating the need for separate antenna components for different bands while maintaining performance isolation through optimized electrical length ratios and impedance matching networks
2Manufacturing precision
If matching components are added to improve band matching, then matching accuracy is improved, but production cost and device complexity increase
Solution Approach 1:
The patent achieves accurate matching across multiple frequency bands by optimizing the electrical length ratios of different sections of the radiating element (e.g., L1/L2, L3/L4 ratios) and adjusting impedance transformation ratios in the feed network, eliminating the need for additional discrete matching components while maintaining high matching accuracy
Solution Approach 2:
The patent extracts and eliminates the need for separate matching components by integrating the matching function directly into the antenna's radiating element structure and feed network design, thereby reducing production complexity and component count while maintaining matching accuracy through optimized geometric parameters
3Volume of moving object
If antenna size is reduced for compact devices, then device compactness is improved, but performance in upper resonance band deteriorates
Solution Approach 1:
The patent utilizes three-dimensional space efficiently by designing a compact radiating element structure that achieves multiple resonant frequencies through vertical and horizontal dimension optimization, allowing the antenna to maintain small physical size while supporting multiple frequency bands including upper resonance bands through careful control of electrical lengths in different spatial dimensions
Solution Approach 2:
The patent maintains upper band performance in a compact size by optimizing the electrical length ratios of different radiating element sections (e.g., L1/L2, L3/L4) to achieve proper impedance matching and resonance characteristics across all bands, including upper frequency bands, without requiring large physical dimensions
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 enables easy matching of both operating bands with improved antenna efficiency and reduced size, maintaining isolation between partial antennas and allowing for additional matching components without degrading performance in either band.
Implementation Method 1
The antenna structure has a lower and an upper resonance, and it has correspondingly two bands
Implementation Method 2
the second radiator comprises a first end and a second end, the second end coupled to a ground and disposed farther from the first radiator than the first end
Implementation Method 3
A planar antenna can be made smaller by manufacturing the radiating plane on the surface of a dielectric substrate instead of it being air-insulated. The higher the permittivity of the material, the smaller, naturally, an antenna element with a certain electric size is physically
Data Source
AI summary
A dielectric dual antenna apparatus intended for applications such as small-sized radio frequency devices. The dual antenna comprises a first partial antenna which implements the lower operating band of the antenna and another partial antenna implementing the upper operating band. The partial antennas have a shared substrate, which together with the radiators constitutes an integrated antenna component. The matching of the dual antenna can be improved in either operating band without degrading it in the other operating band at the same time. Methods of operating the aforementioned apparatus are also disclosed.