Microstrip Transition Thin to Thick Substrates
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Solution Overview
Problem
The challenge lies in finding a solution to transition microstrip lines from thin substrates to thick substrates while maintaining efficient antenna performance, as thinner substrates increase metallic losses and reduce antenna gain and bandwidth, but thick substrates are needed for wide microstrips, which complicates connections to small IC pitches.
Innovation Solution
A structure comprising a first substrate section of one thickness and a second substrate section of a different thickness, connected by vias, with a microstrip line that tapers from a thin width to a thick width, allowing for a transition between the two substrates, and an antenna design that incorporates slots for impedance matching and tuning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the thickness of the substrate is decreased to connect to small IC pitches, then the pitch size compatibility is improved, but the metallic losses of the microstrip lines increase and antenna gain and bandwidth decrease
Solution Approach 1:
The patent introduces a vertical dimension by stacking multiple substrate layers of different thicknesses. The first substrate layer has thickness corresponding to the wavelength of the signal, while the second substrate layer provides mechanical support and grounding. This layered approach allows the system to achieve both thin-substrate connectivity for small IC pitches and thick-substrate performance for reduced metallic losses and improved antenna characteristics.
2Reliability
If the thickness of the substrate is increased to improve antenna gain and bandwidth, then the antenna performance is improved, but the width of the microstrip line must be increased which complicates connection to small IC pitches
Solution Approach 1:
The patent divides the substrate into two distinct segments: a first substrate layer optimized for electromagnetic performance with thickness corresponding to the signal wavelength, and a second substrate layer providing mechanical support and grounding. This segmentation allows each layer to be independently optimized - the first layer achieves the required microstrip line width for good antenna performance, while the second layer provides the structural foundation, thereby achieving both goals without compromise.
3Ease of operation
If a thin substrate is used to achieve small IC pitch connections, then the connectivity to small IC pitches is improved, but the gain and bandwidth of antennas decrease
Solution Approach 1:
The patent resolves this contradiction by adding a vertical dimension through layered substrates. The first substrate layer maintains thinness for easy IC connection, while the second substrate layer adds thickness to improve antenna gain and bandwidth. This dimensional approach allows the system to simultaneously achieve ease of IC connection and reliable antenna performance that would be mutually exclusive in a single-layer substrate.
Data Source
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AI summary
Embodiments are directed to a structure comprising: a first substrate section having a first thickness, a second substrate section having a second thickness different from the first thickness, a plurality of vias configured to couple a first ground plane associated with the first substrate section and a second ground plane associated with the second substrate section, and a microstrip comprising: a first section associated with the first substrate section and having a first width, a second section associated with the second substrate section and having a second width different from the first width, and a taper between the first width and the second width.