Shared Antenna Switching for GPS L5 and WiFi MIMO Space Limits
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Solution Overview
Problem
Mobile terminals face challenges with insufficient space for multiple antennas, particularly for GPS L5 and WiFi MIMO functions, leading to poor debuggability and limited headroom for signal enhancements.
Innovation Solution
An antenna apparatus with a switching mechanism that alternates between GPS and WiFi signals using separate matching circuits, ensuring only one circuit is active at a time, and employs switches and adjustable capacitors to adjust frequency bands for optimal performance in different scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are arranged inside the mobile terminal to support GPS L5 and WiFi MIMO functions, then the communication functionality is improved, but the space for antennas becomes increasingly insufficient
Solution Approach 1:
The patent combines GPS L5 and WiFi MIMO antenna functions into a single shared antenna structure. The antenna apparatus integrates multiple matching circuits (first matching circuit for GPS, second matching circuit for WiFi) that can be selectively activated through an antenna switching device, allowing one antenna to perform multiple communication functions that would traditionally require separate antennas.
Solution Approach 2:
The patent creates a universal antenna system where a single antenna structure serves multiple purposes: it can operate as a GPS L5 antenna when the first matching circuit is activated, and as a WiFi MIMO antenna when the second matching circuit is activated. The antenna switching device enables this multi-functionality by selectively connecting the antenna to different matching circuits based on the required communication function.
2Adaptability or versatility
If a multi-frequency antenna is designed to support both GPS and WiFi frequencies, then the antenna can serve multiple functions, but the space required is larger than that of a single-frequency antenna
Solution Approach 1:
The patent employs dynamic switching between different matching circuits to enable the antenna to adapt its electrical characteristics for different frequency bands. The antenna switching device dynamically connects or disconnects the first or second matching circuit based on whether GPS or WiFi operation is required, allowing the same physical antenna structure to resonate at different frequencies without requiring separate antenna elements for each band.
Solution Approach 2:
The patent changes the electrical parameters of the antenna system by selecting different matching circuits. The first matching circuit is designed with parameters optimized for GPS L5 frequency, while the second matching circuit has parameters optimized for WiFi frequencies. By switching between these circuits, the antenna's resonant frequency and impedance characteristics are adjusted to match the required operating band.
3Reliability
If separate matching circuits are used for GPS and WiFi signals, then each circuit can be optimized for its specific frequency band, but the device complexity increases
Solution Approach 1:
The patent introduces an antenna switching device as an intermediary component that manages the connection between the single antenna and the multiple matching circuits. This switching device acts as a mediator that selectively activates only the required matching circuit (first for GPS, second for WiFi) while keeping the other inactive, thereby enabling frequency-specific optimization without requiring both circuits to operate simultaneously, which would increase complexity.
4Reliability
If headroom is allocated for GPS L5 and WiFi MIMO functions, then signal enhancement is possible, but the headroom given is relatively small due to auxiliary role
Solution Approach 1:
The patent merges the resource allocation for GPS L5 and WiFi MIMO into a shared antenna system. Instead of allocating separate physical space for each function, the system combines both functions into a single antenna apparatus with shared physical infrastructure (antenna element, housing, mounting structure), thereby maximizing the utilization of the limited allocated headroom while still providing signal enhancement capabilities for both auxiliary functions.
Data Source
AI summary
An antenna apparatus includes an antenna, a first matching circuit and a second matching circuit, which are connected to the antenna, and an antenna switching apparatus, which is connected to the first matching circuit and the second matching circuit. Within the same time, only one of the first matching circuit and the second matching circuit is in operation. Operating frequency-band signals of the first matching circuit and the second matching circuit on the antenna are switched by the antenna switching apparatus, so as to be used at staggered times, thereby ensuring that operating frequency-band signals of the first matching circuit and the second matching circuit can be normally used in different scenarios, and effectively improving a performance of the antenna.