Retractable Antenna Length Tuning for GPS and DVB-T/H
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Solution Overview
Problem
Conventional wireless communication devices require two antennas to support GPS and DVB-T/H signals, increasing costs and reducing convenience.
Innovation Solution
A retractable antenna with a pivot structure that changes length to support both GPS and DVB-T/H signals, using a single antenna by configuring it to different lengths for respective frequency bands, with a matching circuit to adjust bandwidth and improve signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two antennas are used to support GPS and DVB-T/H signals, then signal reception quality is improved, but device cost and complexity increase
Solution Approach 1:
The patent applies multi-functionality by designing a single retractable antenna that can operate across multiple frequency bands (GPS L1 at 1575.42 MHz and DVB-T/H at 470-862 MHz) through variable length configuration. The antenna structure includes a feed point coupled to a microstrip line, with the ability to adjust its electrical length to resonate at different frequencies, thereby replacing what would traditionally require two separate antennas.
Solution Approach 2:
The patent utilizes parameter changes by varying the electrical length of the retractable antenna to match different resonant frequencies required for GPS and DVB-T/H signal reception. By changing the physical length parameter of the antenna element, the system achieves optimal impedance matching and resonance conditions for different frequency bands, enabling a single antenna to perform multiple functions.
2Device complexity
If a single antenna is used to support both GPS and DVB-T/H signals, then device cost and complexity are reduced, but signal reception quality may deteriorate
Solution Approach 1:
The patent applies dynamics by incorporating a retractable mechanism that allows the antenna length to be adjusted between extended and retracted positions. This dynamic configuration enables the antenna to optimize its electrical length for different operating modes: when extended for DVB-T/H reception and when retracted for GPS reception, thereby maintaining high signal reception quality across different frequency bands with a single antenna structure.
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
Enables cost reduction and improved convenience by using a single antenna to simultaneously support both GPS and DVB-T/H systems while maintaining good signal-receiving quality across different bandwidth ranges.
Implementation Method 1
A center frequency of the first bandwidth range is substantially a first odd multiple of a reference frequency, and a center frequency of the second bandwidth range is substantially a second odd multiple of the reference frequency
Data Source
AI summary
A wireless communication device including a system ground plane and a retractable antenna is provided. The system ground plane includes a feed point. When the retractable antenna is configured to be a first length, the wireless communication device transceives a first signal of a first bandwidth through the retractable antenna for a first radio frequency system. When the retractable antenna is configured to be a second length, the wireless communication device transceives the first signal and a second signal of a second bandwidth through the retractable antenna respectively for the first radio frequency system and the second radio frequency system. A center frequency of the first bandwidth range is substantially a first odd multiple of a reference frequency, and a center frequency of the second bandwidth range is substantially a second odd multiple of the reference frequency, and the first odd multiple is different to the second odd multiple.