Digital Phase Shifter Layout for Uniform High-Frequency Signal Loss
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Solution Overview
Problem
The loss of high-frequency signals in digital phase shifters is uneven between high-delay and low-delay modes, leading to signal amplitude changes with phase shift amount, particularly in cascaded configurations.
Innovation Solution
A digital phase shift circuit with a multilayer structure between outer and inner lines and ground conductors, wider outer lines, and specific electronic switch configurations to reduce signal loss imbalance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the phase shift amount is increased by switching to high-delay mode, then the phase shift control range is improved, but the signal loss increases
Solution Approach 1:
The patent applies local quality by making only the ground conductor regions between outer and inner lines multilayered, while other parts remain single-layer. This localized multilayer structure reduces signal loss specifically in the high-delay mode return path without affecting the overall circuit design or low-delay mode performance.
Solution Approach 2:
The patent uses composite structure by combining single-layer and multilayer regions within the same circuit. The multilayer ground conductor regions are formed with additional conductive layers stacked vertically, creating a composite structure that provides lower impedance and reduced signal loss for return currents in high-delay mode.
2Loss of energy
If a multilayer structure is formed between outer lines and inner lines, then the signal loss difference between modes is reduced, but the device complexity increases
Solution Approach 1:
The multilayer structure is applied only to specific ground conductor regions between outer and inner lines, rather than the entire circuit. This localized approach reduces signal loss where needed while minimizing the increase in manufacturing complexity and maintaining ease of integration with standard PCB or circuit board processes.
Data Source
AI summary
A digital phase shift circuit includes a signal line extending in a predetermined direction, two inner lines arranged to be separated from the signal line by a predetermined distance at both one side and the other side of the signal line, two outer lines provided at positions farther from the signal line than the inner lines at both the one side and the other side of the signal line, a first ground conductor electrically connected to one ends of the inner lines and the outer lines in the predetermined direction, and a second ground conductor electrically connected to the other ends of the outer lines in the predetermined direction. On both or one of the first ground conductor and the second ground conductor, a region between the outer line and the inner line is formed in a multilayer structure.