Doherty Amplifier Microstrip Layout for Lower Dielectric Loss
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Solution Overview
Problem
Existing high-frequency devices face challenges in reducing size due to the use of bonding wires for semiconductor chip connections, which deteriorate high-frequency characteristics and increase device size when microstrip lines are used.
Innovation Solution
The implementation of a dielectric substrate with a lower dielectric constant than the dielectric substrate, combined with an insulator layer, forms a microstrip line that overlaps the dielectric substrate, allowing for reduced size and lower dielectric loss, and includes capacitors formed by conductor patterns on the dielectric substrate to minimize size and energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bonding wires are used to connect semiconductor chips, then electrical connection is achieved, but high-frequency characteristics deteriorate and device size increases
Solution Approach 1:
The patent extracts and eliminates the bonding wire connection method from the system. Instead of using bonding wires to connect semiconductor chips, the invention uses a microstrip line formed by conductor patterns on dielectric substrates, thereby removing the source of high-frequency characteristic deterioration and enabling device miniaturization.
Solution Approach 2:
The patent replaces the mechanical bonding wire connection system with an electromagnetic field-based microstrip line transmission system. The microstrip line uses conductor patterns on dielectric substrates to transmit high-frequency signals, substituting the physical wire bonding mechanism with a planar electromagnetic transmission structure that maintains signal integrity at high frequencies.
2Ease of operation
If microstrip lines are used for signal transmission, then connection is achieved, but device size increases
Solution Approach 1:
The patent changes the dielectric constant parameter of the substrate material to optimize microstrip line performance. By selecting dielectric substrates with appropriate dielectric constants (first dielectric substrate with first dielectric constant, second dielectric substrate with second dielectric constant), the invention achieves effective signal transmission while reducing the physical dimensions of the microstrip lines and overall device size.
3Volume of moving object
If dielectric substrate with higher dielectric constant is used, then size is reduced, but dielectric loss increases
Solution Approach 1:
The patent applies local quality by using different dielectric substrates with different dielectric constants in different regions or for different functional purposes. The first dielectric substrate with first dielectric constant and the second dielectric substrate with second dielectric constant are used in specific locations to optimize both size reduction and dielectric loss minimization locally, rather than using a uniform substrate throughout the entire device.
Solution Approach 2:
The patent employs composite material structure by combining multiple dielectric substrates with different dielectric constants in a single device architecture. This composite approach allows the system to achieve the benefits of high dielectric constant materials (size reduction) while mitigating their drawbacks (dielectric loss) through strategic material selection and placement in different circuit regions.
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
This configuration results in a high-frequency device and Doherty amplifier that are smaller in size and have reduced dielectric loss, maintaining effective high-frequency performance.
Implementation Method 1
an insulator layer provided on the metal base, covering the dielectric substrate, and having a dielectric constant smaller than that of the dielectric substrate
Data Source
AI summary
A high-frequency device includes a metal base, a dielectric substrate mounted on the metal base, an insulator layer provided on the metal base, covering the dielectric substrate, and having a dielectric constant smaller than that of the dielectric substrate, and a first line that overlaps the dielectric substrate as seen from a thickness direction of the insulator layer and is provided on an upper surface of the insulator layer to form a first microstrip line.