Optimizing Antenna Efficiency in Compact Wireless Devices
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Summary
Problems
Portable communication devices face challenges in efficiently operating across multiple operational frequency bands due to size constraints, which can lead to reduced antenna efficiency and bandwidth, as the natural resonance mode of the printed wiring board differs from the antenna's resonant mode.
Innovation solutions
Incorporating a variable reactive member in series with a switch between the ground and conductive members, allowing for impedance variation and additional resonant frequencies, along with a processor to control the switch configurations, providing multiple current paths for optimized operation across different frequency bands.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If the apparatus size is reduced to meet portability requirements, then the portability and compactness are improved, but the antenna efficiency and bandwidth in multiple operational frequency bands deteriorate
Why choose this principle:
The patent employs a switchable ground plane configuration where the second ground plane portion can be selectively connected or disconnected from the first ground plane portion. This dynamic reconfiguration allows the antenna system to adapt its electrical characteristics for different frequency bands, maintaining antenna efficiency despite the reduced apparatus size. The switchable connection enables transformation between different resonant modes to match different operational frequencies.
Principle concept:
If the apparatus size is reduced to meet portability requirements, then the portability and compactness are improved, but the antenna efficiency and bandwidth in multiple operational frequency bands deteriorate
Why choose this principle:
The patent changes the electrical parameters of the antenna system by selectively connecting or disconnecting the second ground plane portion. This parameter change modifies the resonant frequency and impedance characteristics of the antenna, enabling it to operate efficiently across multiple frequency bands (such as US-GSM 824-894 MHz and EGSM 880-960 MHz) within the constrained physical dimensions of the portable device.
Application Domain
Data Source
AI summary:
Incorporating a variable reactive member in series with a switch between the ground and conductive members, allowing for impedance variation and additional resonant frequencies, along with a processor to control the switch configurations, providing multiple current paths for optimized operation across different frequency bands.
Abstract
An apparatus comprising: a conductive member configured to receive an antenna and to form a non-conductive region between the conductive member and a ground member; and a switch having a first closed configuration and a second open configuration, the first closed configuration being configured to couple the conductive member to the ground member across the non-conductive region and to provide a first current path having a first electrical length and a first resonant frequency, the second open configuration being configured to provide a second current path having a second electrical length and a second resonant frequency, the second resonant frequency being lower than the first resonant frequency.