Waveguide Structure for RF Signal Distribution
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Solution Overview
Problem
Conventional RF systems using planar waveguides suffer from signal losses and crosstalk due to electromagnetic wave propagation in the substrate, necessitating expensive RF substrates and additional structures to prevent crosstalk, which increases costs and complexity.
Innovation Solution
The RF device incorporates a semiconductor package with a waveguide structure oriented parallel to the surface, allowing RF signals to be emitted or received laterally, eliminating the need for expensive RF substrates and reducing crosstalk by using a waveguide structure with a recess and a separate waveguide part, potentially with metallized inner walls, to transmit signals efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If planar waveguides are used on the circuit board, then RF signal transmission is enabled, but signal losses and crosstalk occur between adjacent waveguides
Solution Approach 1:
The patent transitions from planar waveguides propagating in the substrate plane to a three-dimensional waveguide structure that extends vertically from the circuit board surface. The waveguide structure includes a recess in the circuit board and a waveguide body extending upward, allowing RF signals to propagate in a controlled electromagnetic environment isolated from the board substrate, thereby reducing signal losses and crosstalk.
2Reliability
If expensive RF substrates are used to reduce losses, then signal transmission quality improves, but device cost increases
Solution Approach 1:
The patent extracts the waveguide structure from the circuit board substrate by creating a recess and filling it with a separate waveguide material (such as PTFE or other low-loss dielectric). This allows the use of standard, inexpensive circuit board materials while achieving low-loss signal transmission through the specialized waveguide structure, eliminating the need for expensive RF substrates.
3Reliability
If additional structures are added to prevent crosstalk, then signal transmission quality improves, but device complexity increases
Solution Approach 1:
The patent applies crosstalk prevention measures locally at the waveguide structure itself through metallized inner walls and a recess configuration that confines electromagnetic fields. This localized approach provides effective crosstalk isolation without requiring additional shielding structures or complex routing modifications across the entire circuit board, thereby maintaining relatively simple device architecture.
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 enables low-loss signal distribution without crosstalk, allowing for the use of standard circuit boards and optimizing the use of multiple channels on the RF chip, thereby reducing costs and improving performance.
Implementation Method 1
the radio-frequency antenna being designed for at least one of the following: to emit radiation into the waveguide structure
Implementation Method 2
a waveguide structure oriented in a direction parallel to the surface of the semiconductor package
Data Source
AI summary
A radio-frequency device comprises a semiconductor package, which comprises a radio-frequency chip and a radio-frequency antenna. The semiconductor package is designed to be mechanically and electrically connected to a circuit board via at least one connecting element of the semiconductor package, with one surface of the semiconductor package facing the circuit board. The radio-frequency device also comprises a waveguide structure oriented in a direction parallel to the surface of the semiconductor package, the radio-frequency antenna being designed for at least one of the following: to emit radiation into the waveguide structure in the direction parallel to the surface of the semiconductor package, or to receive signals via the waveguide structure in the direction parallel to the surface of the semiconductor package.