Embedded Antenna Substrate Layout for Thin Beamforming RFIC Integration
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Solution Overview
Problem
Existing antenna systems face challenges in achieving a low-profile, thin form factor while maintaining optimal performance and integrating RFICs close to antenna elements, particularly in applications requiring beamforming circuitry.
Innovation Solution
The antenna apparatus employs a sandwich structure with antenna elements on one surface and semiconductor components on the opposite surface, connected via vias and metal pillars, with molding material encapsulation to form a thin, planar beamforming network, and includes a redistribution layer for efficient electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFICs are integrated close to antenna elements for optimum performance, then antenna performance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent transitions from planar integration to three-dimensional vertical stacking, placing RFICs on the backside of the antenna substrate. This dimensional change allows close proximity integration for optimal RF performance while maintaining a low-profile form factor and simplifying the manufacturing process by separating antenna and circuit fabrication steps.
Solution Approach 2:
The patent introduces vias and underfill material as intermediary elements to connect and support the RFICs to the antenna substrate. These intermediaries enable reliable electrical and mechanical connection between the antenna elements and RFICs while managing thermal and structural requirements.
2Volume of moving object
If a thin, planar structure is used to minimize space, then space utilization is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The patent utilizes the vertical dimension by stacking RFICs on the backside of the antenna substrate, enabling heat to dissipate in the z-direction through dedicated thermal vias and heat sinks, rather than relying solely on lateral spreading in a thin planar structure.
Solution Approach 2:
The patent replaces conventional lateral heat spreading mechanisms with vertical heat conduction pathways through thermally conductive materials and direct attachment to heat sinks, creating efficient thermal management in the thickness direction.
3Adaptability or versatility
If multiple ICs are integrated in a sandwich configuration, then functionality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs preliminary alignment features such as alignment marks and precision mounting structures fabricated on the antenna substrate before RFIC attachment. This preliminary preparation ensures accurate positioning of multiple ICs in the sandwich configuration, reducing manufacturing precision requirements during assembly.
4Reliability
If antenna elements and beamforming circuitry are closely integrated, then antenna performance is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent segments the antenna system into distinct functional modules: antenna elements on the front surface, RFICs on the backside, and intermediate connection structures. This segmentation allows each module to be manufactured and tested independently before final assembly, simplifying the overall manufacturing process while maintaining close integration for optimal performance.
Data Source
AI summary
Disclosed is an antenna apparatus including an antenna substrate having a first surface and a second surface on opposite 2024/054268 sides. Antenna elements are formed on the first surface, and vias are formed within the antenna substrate. The antenna apparatus further includes a beamforming network (BFN) including a plurality of semiconductor components, each having a third surface facing the antenna substrate; and metal pillars attaching the second surface to the third surface to thereby attach the semiconductor components to the antenna substrate. The semiconductor components are RF coupled to the antenna elements through the vias. Molding material is formed on the second surface and at least partially encapsulates each of the semiconductor components.