On-Chip Antenna Superstrate Focusing for Millimeter-Wave Gain
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Solution Overview
Problem
Existing RFIC chip package technologies with integrated antennas face challenges in achieving high antenna performance, particularly at frequencies above 94 GHz due to low manufacturing tolerances and lossy materials in organic or ceramic-based multilayer structures, and significant signal attenuation in antenna-in-package designs.
Innovation Solution
The integration of a planar antenna within the BEOL structure of RFIC chips, combined with a superstrate structure featuring a low-loss substrate and a complementary focusing metal element, enhances antenna performance by improving gain and bandwidth for millimeter-wave applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If organic or ceramic-based multilayer antenna structures are used for antenna-in-package design, then antenna integration is achieved, but manufacturing precision and material losses worsen at frequencies above 94 GHz
Solution Approach 1:
The patent changes the material parameter from organic/ceramic substrates to silicon substrate, and changes the antenna configuration from planar to three-dimensional with focusing elements. This parameter transformation enables the antenna structure to achieve superior performance at millimeter-wave frequencies (94 GHz and above) by overcoming the inherent manufacturing precision limitations and material loss characteristics of traditional organic/ceramic multilayer structures.
Solution Approach 2:
The patent employs a composite structure combining silicon substrate with metal focusing elements arranged in three-dimensional configurations. This composite approach integrates the advantages of silicon's low loss at high frequencies with the focusing capability of metal elements, creating an antenna system that overcomes the limitations of single-material organic or ceramic constructions.
2Adaptability or versatility
If antenna-in-package design with flip-chip connection is used, then antenna integration is improved, but signal attenuation increases by more than 1 dB at 94 GHz
Solution Approach 1:
The patent extracts the antenna structure from the traditional package interface and integrates it directly into the silicon substrate itself. By eliminating the separate package and flip-chip connection interface, the design removes the primary source of signal attenuation (more than 1 dB at 94 GHz) while maintaining antenna integration functionality through direct on-chip implementation.
Solution Approach 2:
The patent merges the antenna structure with the silicon substrate, creating an integrated on-chip antenna system. This consolidation of the antenna with the substrate eliminates the need for separate package interfaces and connections, thereby reducing signal attenuation and improving overall system performance at millimeter-wave frequencies.
3Ease of manufacture
If planar antenna elements are used in BEOL structure, then integration is simplified, but antenna gain and bandwidth are insufficient for millimeter-wave applications
Solution Approach 1:
The patent transitions from two-dimensional planar antenna elements to three-dimensional antenna structures with focusing elements positioned at different heights and angles within the silicon substrate. This dimensional transformation enables the antenna to achieve sufficient gain and bandwidth for millimeter-wave applications while maintaining compatibility with standard BEOL fabrication processes, thus resolving the performance limitation without sacrificing integration simplicity.
Solution Approach 2:
The patent applies local quality by positioning metal focusing elements at specific locations and orientations within the silicon substrate to enhance radiation patterns and improve gain in desired directions. This localized enhancement of antenna properties allows the structure to achieve millimeter-wave performance requirements while maintaining overall manufacturing simplicity through standard BEOL processes.
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 significantly increases antenna gain and bandwidth, reducing signal loss and improving radiation efficiency, making it suitable for frequencies up to 94 GHz and beyond.
Implementation Method 1
The focusing metal element has a structure that is complementary to the one or more radiator elements of the planar antenna and which is configured to focus electromagnetic radiation to and from the planar antenna structure
Data Source
AI summary
A radio frequency integrated circuit (RFIC) chip package is provided having an RFIC chip and an integrated antenna structure. The integrated antenna structure includes an on-chip antenna having one or more radiator elements formed as part of a back-end-of-line structure of the RFIC chip. The antenna structure further includes a superstrate structure disposed on the back-end-of-line structure of the RFIC chip. The superstrate structure includes at least one substrate layer and a focusing metal element. The focusing metal element has a structure that is complementary to the on-chip radiator elements and which is configured to focus electromagnetic radiation to and from the planar antenna structure. The superstrate structure improves the performance (e.g., antenna gain and bandwidth) of the on-chip antennas for millimeter-wave applications.