LNBF Feedhorn Partitioning for DRO Power Leakage
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Solution Overview
Problem
Existing Low Noise Block Converter Feedhorns (LNBFs) with Dielectric Resonator Oscillators (DROs) face significant power leakage issues due to the tuning mechanism, leading to signal interference, and previous solutions like large shields are costly and difficult to tune.
Innovation Solution
The design incorporates a PCB with a DRO, a chamber with a first partition and a round hole for the tuning screw, and a cover to prevent power leakage through the gap between the screw and the hole, along with a high density of via holes for grounding, which effectively reduces radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a large shield is used to cover the DRO and electronic elements, then power leakage is restrained, but the cost increases and tuning becomes difficult
Solution Approach 1:
The chamber is divided into multiple partitions (first partition, second partition, third partition) that segment the space around the DRO. Each partition serves as a localized shielding structure, replacing the need for a single large shield. This segmentation reduces overall complexity while maintaining effective power leakage restraint through distributed shielding zones.
2Ease of operation
If a tuning screw is used to adjust DRO frequency, then tuning is enabled, but power leakage occurs through the gap between the screw and chamber
Solution Approach 1:
The third partition is specifically designed to cover only the tuning screw area, providing localized shielding where power leakage occurs. This targeted approach maintains the tuning functionality of the screw while restraining power leakage through the gap between the screw and chamber, without requiring complete shielding of the entire DRO structure.
Solution Approach 2:
The third partition acts as an intermediary structure between the tuning screw and the chamber environment. It provides a shielding interface that allows the tuning screw to perform its function while preventing direct power leakage paths to the surrounding chamber, thus mediating between tuning requirements and leakage prevention.
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 configuration significantly reduces power leakage from the DRO, achieving a relative radiation efficiency of approximately -30 dB, making it easier to tune the DRO while minimizing signal interference and cost.
Implementation Method 1
The DRO employs a tuning screw to tune the oscillating frequency
Implementation Method 2
The cover is used to cover up the tuning screw to restrain power leakage from the DRO through the gap between the round hole and the tuning screw
Data Source
AI summary
A low noise block converter feedhorn (LNBF) is disclosed. The LNBF comprises a PCB, a dielectric resonator oscillator (DRO), a chamber, a tuning screw, and a cover. The DRO is placed on the PCB. The chamber has a first partition, and the first partition is used to cover up the DRO. The chamber further comprises a round hole. The tuning screw passes through the round hole and is then used to adjust the oscillating frequency of the DRO. The cover is used to cover up the tuning screw in order to restrain the DRO from power leakage through the gap in between the round hole and the tuning screw.