Aperture-Coupled Patch Antennas in RF IC Packages
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Solution Overview
Problem
Current radio frequency (RF) integrated circuit packages with high gain antennas are expensive and difficult to package due to the use of bulky waveguides and discrete components, making it challenging to achieve the necessary antenna gain for longer distances while maintaining a compact and cost-effective design, especially for millimeter-wave applications.
Innovation Solution
The implementation of RF IC packages with integrated aperture-coupled patch antennas in ring or offset cavities, which include planar patches, a ground plane with coupling aperture slots, feed lines, and a radio frequency chip, allowing for a multilayer printed circuit board design that reduces component count and eliminates the need for wire bond technology, enabling low-cost, high-performance packaging with integrated antennas or phased arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete components and waveguides are used to achieve high antenna gain, then antenna performance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple discrete components (antenna elements, waveguides, semiconductors) into an integrated array structure where multiple antenna elements are arranged in a phased array configuration within a single package, eliminating the need for separate waveguide assemblies and reducing overall packaging complexity
Solution Approach 2:
The patent transitions from planar microstrip antenna structures to three-dimensional cavity-backed antenna elements, utilizing the vertical dimension to create resonant cavities that enhance gain while maintaining a compact footprint, thereby improving antenna performance without proportionally increasing package volume
2Reliability
If waveguides and discrete components are used, then antenna gain is improved, but package size increases
Solution Approach 1:
The patent nests multiple functional layers within a compact package structure, placing semiconductor devices, feed networks, and antenna elements in stacked configurations where components are integrated into recesses and cavities of the package substrate, thereby achieving high gain antennas with reduced overall package volume
3Device complexity
If integrated antennas are implemented, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the antenna array into modular cavity-backed elements that can be fabricated using standard printed circuit board techniques, with each element consisting of discrete patches, ground planes, and feed lines that can be independently controlled and tested, thereby reducing manufacturing precision requirements compared to monolithic integrated structures
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 solution provides low-cost, high-performance RF IC packages with integrated antennas or phased arrays, suitable for millimeter-wave frequencies, that are easier to fabricate and reduce the complexity of packaging, while maintaining high antenna gain and efficiency, thus addressing the challenges of compactness and cost-effectiveness.
Implementation Method 1
radio frequency (RF) integrated circuit (IC) packages with integrated aperture-coupled patch antenna(s)... in order to radiate the desired signals
Implementation Method 2
The ground plane is formed with at least N coupling aperture slots therein, and the slots are substantially opposed to the patches
Data Source
AI summary
A radio-frequency integrated circuit chip package has N integrated aperture-coupled patch antennas, N being at least two, and includes N generally planar patches, and at least one generally planar ground plane spaced inwardly from the N generally planar patches and substantially parallel thereto. The ground plane is formed with at least N coupling aperture slots therein, and the slots are substantially opposed to the patches. N feed lines are spaced inwardly from the ground plane and substantially parallel thereto, and at least one radio frequency chip is spaced inwardly from the feed lines and coupled to the feed lines and the ground plane. A first substrate layer is spaced inwardly from the feed lines, and is formed with a chip-receiving cavity, with the chip located in the chip-receiving cavity. A second substrate layer is interposed in a region between the ground plane and a plane defined by the patch, the patch is formed in a first metal layer, the ground plane is formed in a second metal layer, and the second substrate layer defines an antenna cavity in which the N generally planar patches are located. “Island” and “offset” configurations, as well as fabrication methods, are also disclosed.