Polarization-Rotating Structure for Improved Microwave Signal Reception
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Summary
Problems
Multiple reflections between the radome and the receiving antenna on a circuit board cause interference in microwave or millimeter wave signals, degrading reception quality and potentially rendering the antenna inoperable due to multipath propagation.
Innovation solutions
A polarization-rotating structure is applied to the circuit board, comprising regularly arranged metal shapes, preferably in an array configuration, to suppress reflections by rotating the polarization of incident waves, thereby minimizing unwanted reflections and improving signal reception.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a radome with focusing property is used to protect the receiving antenna, then the antenna is protected from soiling and weather effects, but multiple reflections occur between the radome and the circuit board causing signal interference
Why choose this principle:
A polarization-rotating structure is introduced as an intermediary element between the radome and the receiving antenna. This structure rotates the polarization of reflected waves by 90 degrees, causing them to be orthogonal to the receiving antenna's polarization direction and thus rejected. This mediator prevents the harmful multiple reflections from reaching the antenna while maintaining the radome's protective function.
Principle concept:
If a radome with focusing property is used to protect the receiving antenna, then the antenna is protected from soiling and weather effects, but multiple reflections occur between the radome and the circuit board causing signal interference
Why choose this principle:
The invention converts the harmful reflected waves into a beneficial configuration by rotating their polarization. Instead of trying to block reflections entirely, the polarization-rotating structure transforms the reflected waves' polarization state so that they become orthogonal to the receiving antenna's sensitivity axis, effectively turning the harmful reflections into non-interfering signals.
Application Domain
Data Source
AI summary:
A polarization-rotating structure is applied to the circuit board, comprising regularly arranged metal shapes, preferably in an array configuration, to suppress reflections by rotating the polarization of incident waves, thereby minimizing unwanted reflections and improving signal reception.
Abstract
A device including a receiving antenna on a circuit board and a radome, multiple reflections of the received signals between the radome and the receiving antenna being avoided by using a polarization-rotating structure on the circuit board. The device may in particular be an integral part of a distance controller for adaptive cruise control of a motor vehicle.