Conductor-Backed Coplanar Waveguide Feed for Compact Antenna Packages
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Solution Overview
Problem
Existing integrated antenna systems in packaged electronic devices face challenges in achieving improved transmission line and packaged transitions for better antenna system performance, particularly in reducing system size and increasing component density for applications like mm-wave communications.
Innovation Solution
A multilevel package substrate with a conductor backed coplanar waveguide transmission line feed is integrated, featuring a semiconductor die mounted to a multilevel package substrate with conductive pads and terminals, and a conductor backed coplanar waveguide transmission line feed that includes an interconnect and a conductor, providing an electromagnetic feed line for high-frequency signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional transmission lines are used in packaged electronic devices, then manufacturing is simpler, but antenna system performance deteriorates due to limited bandwidth and transition losses
Solution Approach 1:
The patent transitions from conventional two-dimensional planar transmission lines to a three-dimensional conductor-backed coplanar waveguide (CBCPW) structure with conductors extending through multiple substrate levels. This dimensional change enables improved electromagnetic field confinement, wider bandwidth operation, and better impedance control, directly resolving the bandwidth and performance limitations of conventional transmission lines while maintaining manufacturability through standardized multilevel PCB fabrication processes.
Solution Approach 2:
The patent employs a composite structure combining multiple dielectric materials with different properties in the multilevel substrate, along with conductive materials of varying geometries (planar traces, vertical vias, backed conductors). This composite approach optimizes electromagnetic performance by controlling impedance, reducing losses, and enhancing bandwidth, while the modular composite structure remains compatible with existing manufacturing techniques.
2Quantity of substance
If system size is reduced to increase component density, then component density improves, but transmission line performance deteriorates due to increased losses and reduced bandwidth
Solution Approach 1:
By utilizing the third dimension with conductors extending through multiple substrate levels and backed conductor planes, the patent achieves superior transmission line performance in a compact footprint. The vertical conductor arrangements and multilevel configuration provide enhanced electromagnetic confinement and reduced losses without increasing the lateral footprint, thus maintaining high component density while improving transmission performance.
Solution Approach 2:
The patent implements a nested structure where conductors are embedded within multilevel dielectric substrates, with inner conductors surrounded by outer grounded conductor planes. This nesting provides electromagnetic shielding, reduces crosstalk, and improves signal integrity in compact configurations, allowing high component density without compromising transmission line performance.
3Ease of manufacture
If conventional package transitions are used, then manufacturing is easier, but signal transmission quality deteriorates due to transition losses and impedance mismatches
Solution Approach 1:
The CBCPW transmission line structure serves multiple functions simultaneously: it provides impedance control, electromagnetic shielding, bandwidth enhancement, and seamless integration with flip-chip mounted semiconductor devices. The multilevel substrate configuration with backed conductors achieves superior signal transmission quality while remaining compatible with standard PCB fabrication processes, thus maintaining ease of manufacture.
Solution Approach 2:
The patent optimizes transmission line performance by carefully controlling geometric parameters (conductor widths, spacing, substrate thicknesses, via dimensions) and material parameters (dielectric constants, loss tangents). These parameter optimizations enable improved impedance matching and reduced transition losses while maintaining compatibility with existing manufacturing capabilities through standardized fabrication tolerances.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances antenna system performance by providing a wider bandwidth and comparable peak gains, improving directivity and gain in the WR5 and WR8 bands, while maintaining efficient signal transmission and integration with host printed circuit boards.
Implementation Method 1
a conductor backed coplanar waveguide transmission line feed in the multilevel package substrate... The interconnect includes coplanar first, second, and third conductive lines extending in the first level along the first direction from respective ends to an antenna
Implementation Method 2
The interconnect includes coplanar first, second, and third conductive lines extending in the first level along the first direction from respective ends to an antenna. The second and third conductive lines are spaced apart from opposite sides of the first conductive line along the second direction
Implementation Method 3
The conductor extends in the third level under the interconnect and under the antenna
Data Source
AI summary
An electronic device includes a multilevel package substrate with first, second, third, and fourth levels, a semiconductor die mounted to the first level, and a conductor backed coplanar waveguide transmission line feed with an interconnect and a conductor, the interconnect including coplanar first, second, and third conductive lines extending in the first level along a first direction from respective ends to an antenna, the second and third conductive lines spaced apart from opposite sides of the first conductive line along an orthogonal second direction, and the conductor extending in the third level under the interconnect and under the antenna.