Glass Ceramic Antenna Package for mmWave Bandwidth
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Solution Overview
Problem
Current packaging strategies for mmWave applications face challenges such as large antenna sizes, high costs, and limited performance due to the size constraints of RFICs and aperture-fed antenna packages, which restrict bandwidth and increase insertion losses.
Innovation Solution
A glass ceramic antenna package design featuring a multi-layered substrate with an antenna on a first layer and shielding elements and feed lines on a second layer, electrically coupled to the antenna, along with a lead frame for mechanical support and ground isolation, enabling a larger bandwidth and cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the antenna size is increased to accommodate larger bandwidth, then the bandwidth is improved, but the package size increases
Solution Approach 1:
The patent transitions from a two-dimensional planar antenna design to a three-dimensional stacked configuration by placing the antenna element, ground plane, and feed lines on different layers of a substrate. This vertical stacking allows the antenna to achieve larger electrical dimensions and broader bandwidth without increasing the horizontal package footprint, effectively resolving the contradiction between bandwidth and package size.
Solution Approach 2:
The patent embeds multiple functional elements within a compact layered structure where the antenna element is positioned above the ground plane, which is in turn above the feed lines. This nested arrangement allows all necessary components to be contained within a small volume, achieving large bandwidth performance without proportionally increasing package size.
2Reliability
If LTCC packaging is used for good electrical performance, then the electrical performance is improved, but the manufacturing cost increases
Solution Approach 1:
The patent changes the substrate material parameter from expensive LTCC (low-temperature co-fired ceramic) to a more cost-effective alternative that maintains the necessary electrical properties for mmWave operation. This parameter change allows achieving good electrical performance without the high manufacturing costs associated with LTCC packaging.
3Adaptability or versatility
If the chip size is increased to accommodate the antenna in AOC package, then the antenna performance is improved, but the cost increases
Solution Approach 1:
The patent separates the antenna element from the RFIC chip, placing the antenna on a dedicated substrate layer while the chip remains on a separate package. This segmentation allows the antenna to be optimized for performance without requiring an oversized chip, thereby avoiding the cost increase associated with larger chip fabrication.
4Reliability
If solder balls are used to connect antenna and chip packages in POP, then the connection is established, but the insertion loss increases
Solution Approach 1:
The patent extracts the connection interface from the traditional solder ball approach by implementing direct feed line connections through the substrate layers. This eliminates the solder ball interface that causes isotropic dimension constraints and insertion losses, providing a more efficient electrical connection between the antenna and RFIC.
Data Source
AI summary
Certain aspects of the present disclosure provide a glass ceramic antenna package having a large bandwidth (e.g., 19 GHz) for millimeter wave (mmWave) applications, for example. The antenna package generally includes an antenna element comprising a first substrate layer and a second substrate layer, wherein the first substrate layer comprises an antenna, wherein the second substrate layer comprises shielding elements and feed lines, and wherein the feed lines are electrically coupled to the antenna. The antenna package also includes a lead frame adjacent to one or more lateral surfaces of the antenna element.