Beamformer RFIC Antenna Array Layout Without Extra RF Layers
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Solution Overview
Problem
Existing antenna arrays with integrated beamformer IC chips face challenges in minimizing space occupation and achieving high efficiency while maintaining reliability, particularly in compact configurations where RFICs are distributed across the antenna aperture.
Innovation Solution
The antenna apparatus features an antenna substrate with RFIC chips attached to its surface, connected through upper surface interconnects to transmission line sections, eliminating the need for an additional transmission line layer and allowing for beamforming circuitry between RF contacts and signal conductors, thereby enhancing performance and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If RFIC chips are distributed across the antenna aperture in a compact configuration, then space occupation is minimized and efficiency is improved, but the structural complexity and manufacturing difficulty increase
Solution Approach 1:
The patent transitions from planar arrangement to three-dimensional stacked configuration by attaching RFIC chips to the rear surface of the antenna substrate, utilizing the Z-dimension to reduce the X-Y footprint while maintaining functional integrity
Solution Approach 2:
The RFIC chips are positioned within the spatial envelope defined by the antenna substrate thickness, nesting the beamforming circuitry within the overall antenna structure volume rather than requiring external space
2Reliability
If additional transmission line layers are added to connect RFIC chips, then signal transmission is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the transmission line function with the antenna substrate by etching conductive traces directly into the substrate material, merging two separate components (transmission line layer and substrate) into a single integrated structure
Solution Approach 2:
The antenna substrate serves multiple functions simultaneously: it provides mechanical support, acts as the RF transmission medium, and serves as the mounting platform for RFIC chips, eliminating the need for dedicated transmission line layers
3Adaptability or versatility
If RFIC chips are attached to the antenna substrate surface, then integration is improved and space is reduced, but heat dissipation and signal interference may worsen
Solution Approach 1:
The patent applies different material properties to different regions of the antenna substrate, with heat sink materials or thermally conductive layers positioned specifically at RFIC attachment locations to enhance local heat dissipation where needed
Solution Approach 2:
The patent introduces intermediate thermal management layers or heat sink structures between the RFIC chips and the antenna substrate, acting as mediators to conduct heat away from the RFICs while maintaining electrical isolation
Data Source
AI summary
An antenna apparatus includes an antenna substrate having opposite first and second surfaces, and at least one antenna element disposed at the first surface. At least one radio frequency integrated circuit (RFIC) chip has a lower surface attached to the second surface of the antenna substrate and has an RF contact coupled to the at least one antenna element through the antenna substrate. The RFIC chip has an RF signal conductor at an upper surface thereof and beamforming circuitry coupled between the RF contact and the RF signal conductor. A transmission line section has a lower surface attached to the second surface of the antenna substrate, and has an upper surface at which a transmission line conductor is disposed and electrically connected to the RF signal conductor of the RFIC chip through an upper surface interconnect.