Impedance-Matched Filter Circuit for Wideband 5G Signal Filtering
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Solution Overview
Problem
Existing communication technologies face challenges in effectively filtering high-frequency signals with high speed and high power, while maintaining low time delay and large bandwidth, which is crucial for advanced 5G communication systems.
Innovation Solution
A filter circuit comprising a first resonant sub-circuit, a second resonant sub-circuit, and an impedance matching network, where each resonant sub-circuit is connected in series with the impedance matching network. The impedance matching network includes multiple capacitors and an inductor, configured to allow signals within a specific frequency range to pass, while attenuating out-of-band signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional LC filters are used for high-frequency signal filtering, then filtering performance can be achieved, but the device size becomes large and integration becomes difficult
Solution Approach 1:
The patent replaces traditional mechanical LC filter structures with an electrical circuit implementation using capacitors and inductors arranged in a specific configuration. The filter circuit uses electrical components and circuit topology to achieve filtering functionality, substituting the mechanical resonance structures with electrical equivalents that can be integrated on a circuit board or chip.
Solution Approach 2:
The patent optimizes the filter performance by carefully selecting and adjusting the electrical parameters of the capacitors and inductors. Specifically, the capacitance values and inductance values are chosen to achieve the desired cutoff frequencies and filtering characteristics while minimizing the physical size of the components. The parameter optimization allows the filter to maintain high-frequency performance with reduced component sizes.
2Productivity
If high-frequency signals are transmitted with high speed and high power, then signal transmission quality is improved, but signal distortion and interference increase
Solution Approach 1:
The patent extracts and removes unwanted frequency components from the high-frequency signal using the filter circuit. By designing the filter with specific cutoff frequencies, it selectively passes the desired signal band while blocking out-of-band interference and distortion products. This extraction of harmful frequency components allows high-speed signal transmission without the associated interference.
Solution Approach 2:
The filter circuit acts as an intermediary between the signal source and the transmission medium. It condition the high-frequency signal by attenuating harmful components before transmission, and can also filter received signals to remove interference. This intermediary filtering function enables clean signal transmission at high speeds by mediating the signal quality throughout the transmission path.
3Adaptability or versatility
If bandwidth is increased for 5G communication, then data transmission capacity is improved, but filter selectivity becomes more difficult to maintain
Solution Approach 1:
The patent divides the filtering function into multiple stages using a cascade configuration of filter sections. Each section contributes to the overall filtering characteristic, allowing the filter to maintain sharp selectivity across a wide bandwidth. The segmented approach enables precise control over the passband and stopband characteristics, achieving both wide bandwidth and high selectivity simultaneously.
Solution Approach 2:
The filter design incorporates adjustable and optimized component values that can be tuned to achieve the desired bandwidth and selectivity characteristics. The dynamic optimization of the circuit parameters allows the filter to adapt to different 5G frequency bands and requirements, maintaining precise selectivity across varying bandwidth conditions through careful parameter selection and circuit configuration.
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
The proposed filter circuit achieves low insertion loss within the passband, rapid out-of-band attenuation, and a compact size, making it suitable for high-frequency applications in 5G communication systems.
Implementation Method 1
The impedance matching network is configured to allow a signal between the first frequency and the second frequency to pass
Implementation Method 2
a first resonant sub-circuit, a second resonant sub-circuit and an impedance matching network; where each of the first resonant sub-circuit and the second resonant sub-circuit is connected to the impedance matching network in series
Data Source
AI summary
A filter circuit includes a first resonant sub-circuit, a second resonant sub-circuit and an impedance matching network; the first resonant sub-circuit and the second resonant sub-circuit are each connected to the impedance matching network in series; the first resonant sub-circuit is configured to allow a signal with a frequency higher than a first frequency to pass; the second resonant sub-circuit is configured to allow a signal with a frequency lower than a second frequency to pass, and the second frequency is greater than the first frequency; the impedance matching network is configured to allow a signal between the first frequency and the second frequency to pass; the impedance matching network includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor and a first inductor.