Embedded Antenna Bandwidth Extension via Subband Matching
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Solution Overview
Problem
Embedded antennas in portable devices have a narrow bandwidth, making them unsuitable for large bandwidth systems like DVB-T, leading to reduced system performance when directly combined with such systems.
Innovation Solution
A signal receiving method and device that divides the predetermined bandwidth into subbands and uses a match unit corresponding to the selected subband to enhance the embedded antenna's capabilities, allowing it to cover the full bandwidth by selectively coupling match units to the embedded antenna based on control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an embedded antenna is used in portable devices, then the device size is reduced, but the antenna bandwidth becomes narrow and insufficient for large bandwidth systems like DVB-T
Solution Approach 1:
The patent divides the wide operating bandwidth into multiple narrow subbands, with each subband matched to a specific embedded antenna. This segmentation allows the system to handle large total bandwidth by breaking it into manageable portions, each optimized for a compact antenna design.
Solution Approach 2:
The patent creates a multi-functional antenna system where multiple embedded antennas, each optimized for specific subbands, work together to provide comprehensive wideband coverage. The system can adaptively select and switch between different antennas based on the operating frequency, making the portable device capable of receiving signals across the entire DVB-T bandwidth despite individual antenna size constraints.
2Device complexity
If an embedded antenna with narrow bandwidth is directly combined with a large bandwidth system, then the device structure is simplified, but the system performance deteriorates
Solution Approach 1:
The patent introduces a bandwidth matching network as an intermediary component between the embedded antenna and the large bandwidth system. This matching network includes variable capacitors and inductors that can be adjusted to optimize the impedance match for different subbands, thereby improving signal reception performance without significantly complicating the overall device structure.
Solution Approach 2:
The patent implements a dynamic antenna switching mechanism that can adaptively select different embedded antennas and adjust matching network parameters based on the operating frequency and signal conditions. This dynamic adaptation allows the system to maintain optimal performance across the wide DVB-T bandwidth while keeping the base structure relatively simple.
Data Source
AI summary
A signal receiving method for receiving a signal within a predetermined bandwidth for a broadcasting system using an embedded antenna is provided, comprising: obtaining an antenna bandwidth of the embedded antenna; dividing the predetermined bandwidth into a plurality of subbands according to the antenna bandwidth; receiving a control signal; selecting one of the subbands according to the control signal; and receiving the signal using a match unit corresponding to the selected subband for matching the embedded antenna.