RF Package and Waveguide PCB Layout for Stress and Loss Control
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Solution Overview
Problem
RF devices used in automotive safety applications face challenges with high costs due to expensive RF laminates and transport losses during signal transfer between RF chips and antennas, which can lead to mechanical stress and potential damage.
Innovation Solution
The RF device design incorporates a printed circuit board with increased elasticity sections to absorb mechanical stresses and a waveguide component with a compensation element to mitigate these issues, allowing for cost-effective production with reduced power losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If expensive RF laminates are used to reduce transport losses, then signal transmission quality is improved, but production costs increase
Solution Approach 1:
The device is divided into separate functional modules: RF chips mounted on a printed circuit board and antennas mounted on a separate radar board. This segmentation allows each module to be optimized independently, reducing the need for expensive RF laminates while maintaining signal transmission quality through controlled impedance connections between modules.
Solution Approach 2:
A transition structure is introduced as an intermediary between the RF chips on the printed circuit board and the antennas on the radar board. This transition structure manages signal transmission and impedance matching, reducing transport losses without requiring expensive RF laminates throughout the entire device.
2Stability of the object's composition
If rigid connections are used between components, then mechanical stability is improved, but mechanical stress and potential damage increase
Solution Approach 1:
A flexible connection structure is used between the printed circuit board and the radar board, replacing rigid mechanical connections. This flexible connection allows for thermal expansion and mechanical stress relief while maintaining electrical connectivity, preventing damage to the RF chips and antennas.
Solution Approach 2:
The connection between boards is designed to be dynamically adaptable rather than rigidly fixed. The flexible connection structure can adjust its physical state in response to thermal and mechanical stresses, maintaining stability while preventing damage accumulation.
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 effectively reduces mechanical stress and power losses, preventing damage to the RF device while maintaining performance and reducing production costs.
Implementation Method 1
The printed circuit board has a second elasticity at least in a second section with an increased elasticity between the first mounting point and the second mounting point, wherein the second elasticity is higher than the first elasticity
Implementation Method 2
a compensation element, in order to absorb mechanical stresses that occur between the waveguide component and the printed circuit board by way of deformation of the compensation element
Data Source
AI summary
A radio-frequency device comprises a printed circuit board and a radio-frequency package, which is mounted on the printed circuit board at a first mounting point and has a radio-frequency chip and a radio-frequency radiation element, wherein the printed circuit board has a first elasticity at least in a first section comprising the first mounting point. The radio-frequency device further comprises a waveguide component, which is mounted on the printed circuit board at a second mounting point and has a waveguide, wherein the radio-frequency radiation element is configured to radiate signals into the waveguide and/or to receive signals by way of the waveguide. The printed circuit board has a second elasticity at least in a second section with an increased elasticity between the first mounting point and the second mounting point, wherein the second elasticity is higher than the first elasticity.