Integrated Millimeter-Wave Filter Array for Low-Loss Antenna Cells
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Solution Overview
Problem
Existing millimeter-wave and microwave filters are designed as discrete components with non-uniform physical and electrical precision, leading to high insertion loss and challenges in fitting and integrating them within the small footprint of antenna elements in phased array transmitters and receivers, particularly in high-frequency cellular communications.
Innovation Solution
A millimeter-wave or microwave filter array is manufactured using precision techniques, incorporating a dielectric layer with cavities and conductive sidewalls, and conductive layers to form resonant spaces, with RF I/O contacts isolated by an isolation region, enabling high Q and low insertion loss, and integrating filters and antennas within a single unit cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If discrete microwave and millimeter wave filters are used, then filter functionality is achieved, but insertion loss is high (significantly above 1 dB) and uniformity between components is poor
Solution Approach 1:
The patent merges multiple discrete filter components into a single integrated filter array structure. The filter array comprises multiple filter elements formed within a unified dielectric substrate with shared ground planes and common fabrication processes, eliminating the need for separate discrete components. This integration ensures uniform physical and electrical characteristics across all filter elements while reducing insertion loss through optimized coupling and reduced inter-component variability.
Solution Approach 2:
The patent employs precise control of physical parameters during fabrication, including dielectric constant uniformity, cavity dimensions, and conductor trace geometry. By maintaining tight parameter tolerances throughout the manufacturing process, the filter array achieves consistent electrical performance across all elements. The use of standardized unit cell designs with controlled dielectric materials and precise dimensional specifications ensures uniformity while optimizing insertion loss characteristics.
2Area of stationary object
If electronic components are made small to fit within antenna element footprint, then integration density is improved, but manufacturing precision and component performance are compromised
Solution Approach 1:
The patent segments the filter functionality into multiple independent yet identical filter elements arranged in an array configuration. Each filter element is designed as a standardized unit cell that can be precisely fabricated using repeatable manufacturing processes. This segmentation allows each component to maintain optimal dimensions for performance while the overall array fits within the required antenna element footprint, preserving manufacturing precision through modular design.
Solution Approach 2:
The patent utilizes three-dimensional cavity structures within the dielectric substrate to achieve compact filter element designs. By extending filter functionality into the vertical dimension with resonant cavities and layered conductor arrangements, the design achieves high integration density without compromising the precision of individual component dimensions. This dimensional approach allows multiple filter elements to be packed efficiently while maintaining manufacturing tolerances.
3Adaptability or versatility
If filters are designed as discrete components, then design flexibility is maintained, but physical and electrical precision between components is non-uniform
Solution Approach 1:
The patent designs a universal filter array architecture where all filter elements share a common dielectric substrate, ground plane structure, and fabrication process. This universal design ensures that each filter element exhibits identical physical and electrical characteristics, achieving uniformity across the array. The modular unit cell design maintains design flexibility by allowing different filter responses to be achieved through systematic variations in cavity dimensions and coupling structures while preserving manufacturing consistency.
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 filter array achieves high quality factor (Q) of 1000 to 2000, low insertion loss below 1 dB, and reliable manufacturing, suitable for high-density applications in 5G cellular communications.
Implementation Method 1
irradiating, using a laser, a first three dimensional structure in the first optically transparent dielectric layer
Implementation Method 2
the first conductive sidewall layers defining a first resonant space comprising some of the dielectric material
Data Source
AI summary
Methods, systems, and apparatuses, for a millimeter wave filter array are discussed. The filter array includes an array of unit cells formed using a dielectric layer of a dielectric material, the dielectric layer having a first surface and an opposing second surface. Each unit cell includes conductive sidewall layers extending at least partially between the first surface and the second surface of the dielectric layer and defining a resonant space within the dielectric layer. Each unit cell also includes a metallized layer formed on the first surface, covering at least a portion of the resonant space of the dielectric layer and electrically connected to the conductive sidewall layers. Each unit cell includes a radio-frequency input-output (RF I/O) contact formed on the first surface of the dielectric layer.