LNB Feed Structure With Segmented Lines for Broadband Return Loss
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Solution Overview
Problem
Conventional satellite communication low noise block down-converters face challenges in optimizing impedance matching and reducing return loss across both high and low frequencies, leading to inefficiencies in signal transmission.
Innovation Solution
The feeding apparatus incorporates a substrate with an annular grounded metal sheet, a rectangular grounded metal sheet, and parasitic grounded metal sheets, along with feeding metal sheets of varying widths, to achieve impedance matching and reduce return loss across the frequency range by modifying the widths of the feeding metal sheets and strategically placing parasitic grounded metal sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lengths of the feeding metal sheets are modified to control impedance for impedance matching, then impedance matching is achieved with sufficient bandwidth, but return loss cannot be optimized at both high frequencies and low frequencies simultaneously
Solution Approach 1:
The feeding metal sheets are divided into multiple segments with different width characteristics. Each segment (first, second, third portions) has a specific width that contributes to different frequency range impedance control, allowing simultaneous optimization across the entire frequency band including both high and low frequencies
Solution Approach 2:
Different portions of the feeding metal sheets are designed with different width characteristics to optimize performance at different frequency ranges. The parasitic grounded metal sheets are strategically positioned to provide localized impedance control, enabling return loss optimization at both high frequencies (12.00-12.75 GHz) and low frequencies (10.70-11.00 GHz) simultaneously
2Adaptability or versatility
If the feeding apparatus is designed for broad frequency coverage, then operating frequency range is expanded, but return loss increases at the extremes of the frequency band
Solution Approach 1:
The feeding metal sheets are segmented into multiple portions with progressively changing widths. This segmentation allows each portion to contribute to impedance control at different frequency ranges, maintaining low return loss across the entire extended frequency band from 10.70 GHz to 12.75 GHz
Solution Approach 2:
The parasitic grounded metal sheets are added as a new structural element extending in a direction different from the feeding metal sheets. This dimensional addition provides extra degrees of freedom for impedance control, enabling simultaneous optimization across the broad frequency range with reduced return loss at frequency extremes
Data Source
AI summary
A feeding apparatus includes a substrate, an annular grounded metal sheet having a first opening and a second opening, a rectangular grounded metal sheet extending from the annular grounded metal sheet toward an interior according to a configuration of a septum polarizer of a waveguide, a first parasitic grounded metal sheet extending from a side of the rectangular grounded metal sheet along a first direction, a second parasitic grounded metal sheet extending from another side of the rectangular grounded metal sheet along a second direction, a first feeding metal sheet extending from the first opening toward the interior and including a first portion, a second portion and a third portion and a second feeding metal sheet extending from the second opening toward the interior and including a fourth portion, a fifth portion and a sixth portion.