Dual-Polarized Phased Antenna Array With Shared Aperture Integration
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Solution Overview
Problem
Conventional phased antenna array devices face challenges such as high RF losses, size limitations due to silicon die size constraints, costly manufacturing, and complexity in dual polarized operations, leading to inefficiencies in beamforming and increased costs.
Innovation Solution
The use of reconstituted wafer techniques and embedded wafer level package processes for IC packaging, allowing for a dual polarized architecture with shared aperture for transmit and receive signals, and integration of multiple silicon dies without flip-chip bonding, along with efficient bulk-feed power amplifiers to reduce manufacturing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional modular design approach is used for phased antenna array, then assembly complexity is reduced, but manufacturing cost increases and RF losses occur
Solution Approach 1:
The patent merges multiple separate modules into a single integrated silicon die structure. The phased antenna array elements, feeding networks, and control circuits are all fabricated together on one wafer using standard CMOS processes, eliminating the need for separate assembly steps and reducing manufacturing costs while maintaining modular scalability through wafer-level integration.
Solution Approach 2:
The invention creates a universal platform where a single silicon die can support multiple antenna elements with different polarizations and beamforming functions. The shared corporate divider/combiner network and common substrate structure enable the same hardware to perform multiple functions across different frequency bands and polarization modes.
2Area of moving object
If silicon die size is increased to accommodate more antenna elements, then array capability improves, but cost per die becomes prohibitive and thermal expansion issues arise
Solution Approach 1:
The patent segments the large antenna array into multiple identical or similar silicon dies that can be produced in high volumes on a single wafer. Each die contains a subset of antenna elements but shares the same fabrication process and packaging approach, allowing cost amortization across large production batches while maintaining individual die size within manufacturable limits.
Solution Approach 2:
The invention transitions from planar 2D array expansion to 3D integration by stacking multiple antenna layers vertically on the same silicon die. This enables significantly larger effective aperture and more antenna elements without increasing the die footprint, thereby avoiding the cost and thermal issues associated with larger single-layer dies.
3Ease of operation
If corporate divider/combiner is used for beamforming, then signal distribution is achieved, but RF losses increase significantly
Solution Approach 1:
The patent replaces traditional lossy RF corporate divider/combiner networks with digital beamforming processing. Phase and amplitude control is achieved through digital signal processing in the baseband domain rather than through analog RF switching and power splitting, eliminating the inherent RF losses associated with physical signal distribution networks.
Solution Approach 2:
The invention changes the operating domain from analog RF frequency to digital baseband frequency. By performing beamforming operations in the digital domain after ADC conversion, the system achieves precise phase and amplitude control without the energy losses inherent in analog RF power dividers and combiners.
4Adaptability or versatility
If dual polarized operation is implemented, then communication versatility improves, but phase controlled connectivity complexity increases
Solution Approach 1:
The patent combines both polarization channels into a single integrated processing path on the silicon die. The corporate divider/combiner network and digital beamforming logic handle both polarizations simultaneously through shared resources, eliminating the need for separate phase-controlled connectivity paths for each polarization and reducing overall system complexity.
Data Source
AI summary
A phased antenna array device comprises at least one input port for interfacing receive and transmit RF signals to/from an antenna array. A feeding line is provided to carry RF signals of two orthogonal polarizations from the input port P1, and at least one antenna feed element with an aperture or cross section having an order of symmetry C4 and supporting RF signals of two orthogonal polarizations is provided. At least one first substrate contains a plurality of antenna elements integrated into the substrate, with each antenna element capable of operating at two orthogonal polarizations. A plurality of phase shifters are connected to corresponding antenna elements, each phase shifter operating at two orthogonal polarizations, the output port of each phase shifter being connected to a short circuit.