Substrate-Based Antenna Structure for Millimeter-Wave Packaging
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Solution Overview
Problem
Current millimeter-wave radio communication systems face challenges in achieving high antenna gains for longer operating distances due to the complexity and cost of traditional packaging methods, which also hinder effective heat dissipation and mass production.
Innovation Solution
The proposed solution involves a substrate-based antenna structure with flip-chip mounting to a printed circuit board, utilizing low-loss substrates and plated through vias for efficient signal and power connections, allowing for simpler and cost-effective manufacturing while maintaining high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional waveguide and package-level microstrip structures are used to interconnect semiconductors and antennas, then high antenna gain is achieved, but device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent combines the antenna structure, feed line, and RF chip into a single integrated package. The antenna is printed directly on the package substrate, and the RF chip is flip-chip mounted with direct electrical connection to the feed line, eliminating the need for separate waveguides and package-level microstrip structures. This merging of components achieves high antenna gain while reducing packaging complexity.
Solution Approach 2:
The patent replaces mechanical waveguide structures with printed circuit board trace feed lines. Instead of using bulky mechanical waveguides to interconnect the RF chip and antenna, the invention uses planar microstrip or coplanar waveguide traces printed on the package substrate, significantly reducing device complexity and enabling mass production.
2Ease of manufacture
If discrete components are assembled with low integration levels, then manufacturing flexibility is maintained, but manufacturing productivity decreases
Solution Approach 1:
The patent merges the antenna, feed line, and RF chip into a single integrated package that can be manufactured using standard PCB and flip-chip mounting processes. This integration maintains manufacturing flexibility while enabling mass production through automated assembly techniques, significantly improving productivity compared to discrete component assembly.
Solution Approach 2:
The package substrate serves multiple functions: it provides the antenna radiating element, the feed line transmission path, the mounting platform for the RF chip, and the interface to the external world through PCB mounting holes. This multi-functionality reduces the number of separate components needed and simplifies the manufacturing process.
3Reliability
If high-gain antennas are used for longer operating distances, then antenna gain increases, but beam width becomes very narrow making accurate pointing difficult
Solution Approach 1:
The patent implements a phased array system where the phase and amplitude of signals fed to each antenna element can be dynamically controlled. This allows electronic beam steering and shaping, enabling the system to maintain narrow high-gain beams for long-distance communication while dynamically adjusting the beam direction through phase control, thereby achieving both long operating distance and ease of operation through electronic pointing.
4Reliability
If complex packaging structures are used to achieve high performance, then antenna performance is improved, but heat dissipation capability deteriorates
Solution Approach 1:
The patent extracts the RF chip from the main package body and mounts it on the reverse side of the antenna substrate. This separation allows independent thermal management of the RF chip, with direct access to heatsinks or thermal vias in the substrate, improving heat dissipation capability while maintaining the high-performance antenna structure on the front side.
Data Source
AI summary
In an illustrative embodiment, an apparatus includes at least one antenna structure located on a first surface of a first substrate; at least one pad located on the first surface of the first substrate; and at least one via traversing the first substrate and thereby connecting the at least one pad located on the first surface of the first substrate to at least one pad located on a second surface. The at least one pad located on the first surface of the first substrate is operatively coupleable to at least one pad located on a surface of an integrated circuit and the at least one pad located on the second surface is operatively coupleable to at least one pad located on a surface of a printed circuit board. The at least one via is thereby operative to couple the at least one pad located on the surface of the integrated circuit and the at least one pad located on the surface of the printed circuit board.