Multi-band Antenna System with Optimized Frequency Band Isolation
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Solution Overview
Problem
Existing multi-band and multi-mode wireless devices face performance limitations due to the traditional primary-secondary antenna architecture, which struggles to optimize signal reception and transmission across diverse frequency bands, leading to suboptimal performance in various wireless standards and frequency ranges.
Innovation Solution
A multi-band and multi-mode antenna system comprising two antennas optimized for specific frequency bands, with RF front-end modules and duplexers configured to direct primary and diversity signals effectively across different frequency bands, enhancing signal isolation and amplification, and utilizing power amplifiers for efficient signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional primary-secondary antenna architecture is used, then the device structure is simple, but the signal reception and transmission performance across diverse frequency bands is suboptimal
Solution Approach 1:
The patent implements a multi-band antenna system where a single antenna structure is designed to operate across multiple frequency bands (GSM 850, GSM 900, UMTS 2100, etc.) by incorporating multiple radiating elements and impedance matching networks. This allows the antenna to serve multiple frequency bands simultaneously, improving signal reception across diverse bands while avoiding the complexity of deploying separate antennas for each band.
Solution Approach 2:
The antenna system is divided into multiple independent radiating elements (first radiating element, second radiating element, third radiating element) that can be independently optimized for different frequency bands. Each element can be selectively activated or tuned based on the operating band, allowing the system to achieve optimal performance across multiple bands while maintaining a unified antenna structure.
2Reliability
If separate antennas are used for different frequency bands, then the performance for each band is optimized, but the device size and cost increase
Solution Approach 1:
The patent combines multiple frequency band operations into a single integrated antenna structure. The antenna system includes multiple radiating elements and impedance matching networks that are merged into one unified structure, allowing simultaneous or selective operation across GSM 850, GSM 900, UMTS 2100, and other bands. This merging approach achieves multi-band performance optimization while significantly reducing the total area compared to using separate antennas for each band.
Solution Approach 2:
The antenna design employs a nested configuration where multiple radiating elements are positioned in a compact arrangement, with elements for different frequency bands integrated within the same spatial footprint. The impedance matching networks are also nested within the antenna structure, allowing multiple frequency band capabilities to be contained within a single antenna assembly, thereby minimizing the overall area occupied.
3Area of stationary object
If a single antenna is used for all frequency bands, then the device is compact, but the performance efficiency drops across different bands
Solution Approach 1:
The patent applies local quality optimization by designing each radiating element with specific geometric characteristics tailored to its intended frequency band. The first radiating element is optimized for lower bands (GSM 850, GSM 900), while the second and third elements are optimized for higher bands (UMTS 2100). Each element's dimensions, shape, and positioning are locally optimized to maximize efficiency at its target frequency, thereby maintaining high signal efficiency across all bands within a compact single-antenna structure.
Data Source
AI summary
An antenna system is disclosed. A wireless device includes two antennas. The first antenna is optimized at a first frequency band. The second antenna is optimized at a second frequency band. The signals received from respective optimized frequency bands are used as primary received signals. The signals having frequencies beyond respective optimized frequency bands are used as diversity signals. Likewise, the signals transmitted from a transceiver to base stations are sent to respective antennas based upon their frequency bands. By employing this optimized antenna configuration, the wireless device can provide high quality wireless signals for both frequency bands.