Software Defined Antenna Control for FM Reception
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Solution Overview
Problem
Conventional mobile terminal antennas, particularly those used in Bluetooth headsets, face challenges in receiving FM signals due to their small size and limited sensitivity, which can be affected by capacitive and inductive changes and interference from device components, leading to reduced reception quality.
Innovation Solution
A system and method for software-defined antenna control that involves selectively coupling and impedance matching tunable antennas to a single programmable output stage using a programmable matching circuit with adjustable inductance and capacitance, and a programmable switch array, allowing the antennas to operate in different frequency bands and be tuned within specific bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small circuit board antenna is used in mobile terminals, then the device size is reduced, but the antenna reception sensitivity and frequency stability deteriorate due to capacitive and inductive changes and component interference
Solution Approach 1:
The patent employs variable capacitors and inductors to dynamically adjust the antenna's electrical parameters (capacitance and inductance), allowing the antenna to maintain optimal resonance frequency and impedance matching despite changes in device configuration or external conditions, thereby preserving reception sensitivity in a compact form factor
Solution Approach 2:
The patent implements a dynamic tuning mechanism that automatically adjusts antenna parameters in real-time based on detected signal conditions, enabling the small antenna to adapt to varying capacitive and inductive environments caused by different device orientations, user handling, and component states
2Volume of moving object
If a small circuit board antenna is used in mobile terminals, then the device size is reduced, but the antenna frequency stability deteriorates due to capacitive and inductive changes
Solution Approach 1:
The patent uses variable capacitors and inductors to dynamically adjust the antenna's resonant frequency, compensating for frequency drift caused by capacitive and inductive changes in the device environment, thereby maintaining stable center frequency operation
Solution Approach 2:
The patent implements a feedback mechanism that monitors the antenna's resonance frequency and automatically adjusts the variable capacitors and inductors to maintain the desired center frequency, counteracting frequency shifts caused by environmental changes
3Reliability
If wireless systems are designed for a specific frequency with optimized device performance, then the reception quality is improved, but the system adaptability to different frequency bands deteriorates
Solution Approach 1:
The patent designs the antenna system with variable capacitors and inductors that can be reconfigured to support multiple frequency bands (including FM radio and wireless communication frequencies), allowing a single antenna structure to perform multiple functions across different frequency ranges while maintaining optimized reception quality for each band
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
This approach enables improved RF signal reception across various frequency bands, reducing interference and enhancing antenna performance by allowing for smart antenna techniques like beam forming and multi-antenna diversity, thus improving the overall reception quality and adaptability of mobile terminals.
Implementation Method 1
A programmable matching circuit comprising adjustable inductance and capacitance may be used to impedance match the antenna to the output stage
Implementation Method 2
Wireless devices use antennas to receive RF signals
Data Source
AI summary
Methods and systems for reducing AM/PM and AM/AM distortion are disclosed and may comprise selectively coupling and impedance matching one of a plurality of tunable antennas to a single programmable output stage comprising a single power amplifier on a chip in a transmitter. A programmable matching circuit comprising adjustable inductance and capacitance may be used to impedance match the antenna to the output stage. The selected tunable antenna may be coupled to the output stage utilizing a programmable switch array, which may comprise at least one integrated transistor, for example. The tunable antennas may be designed to operate in different frequency bands and to be tuned within one or more frequency bands. The programmable matching circuit may be integrated on the chip or external to the chip. The matching circuit capacitance may be integrated on-chip, and the inductance may be located off-chip.