Ceramic RF Crossover with Insulated Intersecting Strips
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Solution Overview
Problem
Existing RF crossovers in microwave systems face issues with high transmission and return losses, and insufficient insulation, leading to noise interference from the external environment, while requiring dimensionally small and cost-efficient designs.
Innovation Solution
A ceramic-based RF crossover apparatus with intersecting RF strips and an insulation layer, integrated matching circuits, and an earthing layer, produced using low-temperature sintered ceramic, which provides high-frequency operation and reduces transmission and return losses by ensuring effective insulation and impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a coaxial cable crossover structure is used, then insulation between channels is improved, but the device size becomes large and transmission losses increase
Solution Approach 1:
The patent changes the physical parameters of the crossover structure by using planar RF strips on a ceramic substrate instead of three-dimensional coaxial cables. This parameter change maintains insulation between channels while dramatically reducing the device volume to a compact planar configuration suitable for integration into microwave circuits.
Solution Approach 2:
The patent replaces the mechanical coaxial cable system with an electromagnetic field-based planar microstrip structure. The RF strips are separated by dielectric material and positioned to achieve the required isolation through electromagnetic field distribution rather than physical mechanical separation, reducing size while maintaining performance.
2Volume of moving object
If gold strip crossover method is used, then device size is reduced, but crossover bandwidth becomes narrow and transmission losses increase
Solution Approach 1:
The patent uses a composite structure consisting of conductive RF strips on a ceramic substrate with dielectric properties. The combination of the conductive strips and the ceramic material with specific permittivity creates a resonant structure that achieves both compact size and wide bandwidth operation while maintaining low transmission losses through optimized electromagnetic field distribution.
Solution Approach 2:
The patent optimizes the geometric parameters of the RF strips including width, length, spacing, and positioning on the ceramic substrate. By carefully adjusting these parameters, the structure achieves wide bandwidth operation and low transmission losses while maintaining a compact form factor, overcoming the limitations of simple gold strip crossovers.
3Device complexity
If RF strips are exposed to external environment, then manufacturing complexity is reduced, but noise interference increases and insulation performance deteriorates
Solution Approach 1:
The patent uses the ceramic substrate as a protective dielectric layer that encapsulates and isolates the RF strips from the external environment. This thin film approach provides electrical insulation and protection from noise interference while maintaining a simple manufacturing process and compact structure.
Solution Approach 2:
The ceramic substrate creates an electrically inert environment for the RF strips by providing high dielectric strength and insulation properties. This protects the sensitive RF signals from external electromagnetic interference and noise while the entire structure remains manufacturable using standard ceramic processing techniques.
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 achieves low transmission and return losses, reduces noise interference, and eliminates the need for additional matching circuits, enabling efficient operation in high-frequency microwave systems with compact and cost-effective designs.
Implementation Method 1
a body produced from ceramic material, at least two RF strips placed inside the body in a way to intersect each other and at least one insulation layer which provides for the RF strips placed on the body to be insulated at least from the external environment
Implementation Method 2
matching circuits on the tips of the RF strips which provide for the RF strips to be passed on to chip devices during use
Implementation Method 3
produced using low-temperature sintered ceramic
Data Source
AI summary
An RF crossover apparatus provides low transmission and return losses for microwave systems and meets the requirement for the RF signals to leap over each other as in an insulated state. The RF crossover apparatus contains a body produced from ceramic material, at least two RF strips placed inside the body in a way to intersect each other and at least one insulation layer insulating the RF strips placed on the body at least from the external environment. The body produced from ceramic material enables operation on high frequencies and this provides low transmission and return losses. The RE crossover apparatus also contains matching circuits on the tips of the RF strips for the RF strips to be passed to chip devices during use.