Integrated LNB Cavity Waveguide Filter for 5G Interference Rejection
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Solution Overview
Problem
Existing low noise block down converters for satellite broadcasting face challenges in efficiently removing interference from terrestrial signals like 5G mobile communication signals, leading to signal saturation and poor economic efficiency due to the use of external cavity waveguide band pass filters, which are expensive, bulky, and difficult to maintain.
Innovation Solution
A low noise block down converter with a built-in cavity waveguide band pass filter that amplifies satellite signals while filtering out terrestrial transmission frequencies, minimizing unnecessary frequency amplification and preventing amplifier saturation, and facilitating easier installation and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an external cavity waveguide band pass filter is installed to remove terrestrial signal interference, then the interference removal capability is improved, but the device complexity, cost, and installation difficulty increase
Solution Approach 1:
The patent integrates the cavity waveguide band pass filter directly into the LNB housing, merging two previously separate components (filter and LNB) into a single integrated unit. This eliminates the need for separate external filter installation while maintaining the interference removal function, thereby reducing device complexity and installation difficulty
Solution Approach 2:
The filter cavity is nested within the LNB housing structure, with the waveguide path integrated into the existing LNB component layout. The filter blocks are positioned inside the LNB housing, creating a compact nested arrangement that eliminates external filter mounting requirements
2Object-affected harmful factors
If an external cavity waveguide band pass filter is used to filter terrestrial signals, then the signal filtering performance is improved, but the equipment cost increases
Solution Approach 1:
By combining the filter and LNB into a single integrated component, the patent eliminates the need to manufacture and supply separate external filters. The integrated design allows for unified manufacturing processes, reducing overall production costs while maintaining filtering performance
Solution Approach 2:
The integrated LNB-filter unit serves multiple functions simultaneously: signal reception, amplification, frequency conversion, and terrestrial signal filtering. This multi-functionality eliminates the need for separate dedicated filter components, reducing overall equipment cost
3Object-affected harmful factors
If an external cavity waveguide band pass filter is installed to remove interference, then the interference rejection is improved, but the weight and support burden increase
Solution Approach 1:
The patent merges the filter structure with the LNB housing, combining the weights of previously separate components into a single integrated unit. This eliminates the additional weight burden on the support structure that would result from installing a separate external filter
4Measurement precision
If an external cavity waveguide band pass filter is used to filter signals, then the frequency selectivity is improved, but the insertion loss increases
Solution Approach 1:
The patent optimizes the filter design parameters including cavity dimensions, waveguide geometry, and filter block positioning to achieve sharp frequency selectivity with minimal insertion loss. The integrated design allows for precise parameter tuning to balance filtering performance and signal transmission efficiency
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 solution improves the quality of received satellite broadcasting signals by effectively removing terrestrial signal interference, reducing equipment costs, and simplifying maintenance, while maintaining sufficient gain for intermediate frequency signals.
Implementation Method 1
a built-in cavity waveguide band pass filter configured to pass a frequency band being higher or lower than a frequency band of a predetermined terrestrial transmission signal among satellite broadcasting frequency bands
Implementation Method 2
a low noise amplifying unit including one or more low noise amplifiers configured to amplify a signal received from the input terminal
Implementation Method 3
a mixer configured to convert the signal output from the low noise amplifying unit into an intermediate frequency signal by mixing the signal output from the low noise amplifying unit with a local oscillation signal
Data Source
AI summary
A low noise block down converter for receiving satellite broadcasting comprises an input terminal; a low noise amplifying unit including one or more low noise amplifiers configured to amplify a signal received from the input terminal, and a built-in cavity waveguide band pass filter configured to pass a frequency band being higher or lower than a frequency band of a predetermined terrestrial transmission signal among satellite broadcasting frequency bands of signals amplified by the one or more low noise amplifiers; and a mixer configured to convert the signal output from the low noise amplifying unit into an intermediate frequency signal by mixing the signal output from the low noise amplifying unit with a local oscillation signal.