Antenna System Harmonic Suppression via Frequency Division
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Solution Overview
Problem
Designing an antenna system that meets the requirements of carrier aggregation for LTE-A, which necessitates wider transmission bandwidths and multiple frequency ranges, is a critical challenge due to the complexity of supporting wider frequency range widths.
Innovation Solution
The antenna system incorporates a first and second frequency dividing circuit, along with matching circuits, to process different frequency signals by dividing and combining frequency sub-ranges, preventing interference and allowing impedance switching, thereby supporting carrier aggregation and suppressing harmonic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is implemented to widen transmission bandwidth, then the effective bandwidth delivered to user terminal is expanded, but the device complexity and design difficulty of the antenna system increases
Solution Approach 1:
The antenna system divides the wide frequency range into multiple frequency sub-ranges using frequency dividing circuits. Each sub-range is processed separately through dedicated matching circuits, which simplifies the overall design compared to handling the entire wide bandwidth as a single complex system. This segmentation approach enables carrier aggregation while managing system complexity.
2Adaptability or versatility
If multiple frequency ranges are supported for carrier aggregation, then the transmission bandwidth is widened, but the antenna system design becomes more challenging
Solution Approach 1:
The antenna system employs a universal architecture that can handle multiple frequency ranges through a common structure with frequency-selective components. The frequency dividing circuits and matching circuits work together to provide multi-functionality, allowing the same antenna system to support carrier aggregation across different frequency bands without requiring completely separate designs for each band.
3Reliability
If frequency dividing circuits and matching circuits are added to process different frequency signals, then harmonic interference is suppressed and bandwidth is widened, but the device complexity increases
Solution Approach 1:
The frequency dividing circuits extract and separate different frequency sub-ranges from the overall frequency spectrum, directing each sub-range to appropriate matching circuits. This extraction approach isolates harmonic frequencies and prevents interference, improving reliability while managing complexity through systematic frequency separation rather than attempting to handle all frequencies simultaneously in a single complex circuit.
Data Source
AI summary
An antenna system includes an antenna, a first frequency dividing circuit, a second frequency dividing circuit, and a plurality of matching circuits. The first frequency dividing circuit is coupled to the antenna. The matching circuits are coupled to the first frequency dividing circuit. The second frequency dividing circuit is coupled to the matching circuits. The matching circuits are configured to process different frequency signals, respectively.