Transmitter Circuit Tuning Elements for ISM Band Impedance Matching
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Solution Overview
Problem
Transmitter circuits in the ISM band face challenges in efficiently matching resonant frequencies and impedance across different carrier frequencies and external influences, leading to potential impedance mismatches and reduced transmission power.
Innovation Solution
A transmitter circuit with a matching device having at least two tuning elements that adjust resonant frequency and impedance matching between the transmitting device and antenna device, allowing for variable transmission frequencies and power modification without additional changeover components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transmitter circuit operates at different carrier frequencies in the ISM band, then versatility and adaptability are improved, but impedance matching and resonant frequency alignment become more difficult to maintain
Solution Approach 1:
The patent implements dynamic impedance matching by making the matching network adjustable through control circuitry. The matching network includes variable components (such as switched capacitors or inductors) that can be reconfigured based on the selected carrier frequency, allowing the system to adapt impedance matching in real-time across different operating frequencies in the ISM band
Solution Approach 2:
The patent changes electrical parameters of the matching network components based on the operating frequency. By switching between different component values or configurations (e.g., changing capacitance or inductance values), the system maintains optimal impedance matching across multiple carrier frequencies, resolving the contradiction between frequency versatility and matching reliability
2Adaptability or versatility
If external influences and manufacturing tolerances vary, then environmental adaptability is improved, but transmission power stability deteriorates
Solution Approach 1:
The patent incorporates feedback mechanisms that monitor the actual transmission conditions and adjust the matching network accordingly. By detecting variations caused by external influences or manufacturing tolerances and dynamically compensating through the adjustable matching network, the system maintains stable transmission power despite environmental changes
Solution Approach 2:
The matching network is designed to be dynamically adjustable to compensate for environmental variations and manufacturing tolerances. Control circuitry modifies the network parameters in real-time based on detected conditions, ensuring transmission power stability across different operating environments
3Adaptability or versatility
If additional changeover components are added for frequency adjustment, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent designs the matching network to serve multiple functions simultaneously - it provides impedance matching, frequency selection, and resonant frequency adjustment all through a single integrated adjustable network. This multi-functionality reduces the need for separate changeover components for each function, thereby reducing overall device complexity while maintaining frequency adaptability
Solution Approach 2:
The patent merges the frequency adjustment function with the impedance matching function into a single integrated system. By combining these functions in one adjustable matching network rather than using separate components, the system achieves frequency versatility without proportionally increasing device complexity
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 flexible frequency and impedance adjustments, minimizing reactive load impedance and maintaining optimal transmission power across varying conditions, such as manufacturing tolerances and external influences.
Implementation Method 1
a matching device having at least two tuning elements for setting the resonant frequency of a circuit arrangement, which is formed from the antenna device and the first and second tuning elements
Implementation Method 2
for matching the impedance of the transmitting device and the antenna device
Data Source
AI summary
A transmitter circuit. One embodiment provides for emitting electromagnetic waves. The circuit has a transmitting device for outputting a transmission signal, an antenna device for emitting the transmission signal in the form of an electromagnetic wave, and a matching device which is electrically connected to the transmitting device and to the antenna device. The matching device includes at least two tuning elements for setting the resonant frequency of a circuit arrangement, formed from the antenna device and the first and second tuning elements, and for matching the impedance of the transmitting device and the antenna device.