Passive Phase Shifter LC Resonance Millimeter Wave Loss
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Solution Overview
Problem
Conventional passive phase shifting circuits in wireless communication networks face challenges with high insertion loss and group delay, which hinder efficient beamforming and signal processing at millimeter wave frequencies.
Innovation Solution
A passive phase shifting circuit design utilizing a transmission line with inductive elements and double-pole, single-throw switches, configured to behave as an LC resonant circuit, reducing phase shift and group delay by controlling switches with digital control lines to achieve lower loss and delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional passive phase shifting circuits are used, then phase shifting function is provided, but insertion loss and group delay are high
Solution Approach 1:
The patent changes the electrical parameters of the transmission line by introducing variable capacitance through switched capacitor networks. By adjusting the capacitance values dynamically, the phase shift amount is changed without requiring physical reconfiguration of the transmission line structure, thereby reducing insertion loss and group delay while maintaining phase shifting functionality.
Solution Approach 2:
The invention transforms the static passive phase shifter into a dynamic system by incorporating electronically controllable capacitor arrays. These capacitors can be switched on and off to dynamically adjust the phase shift amount, allowing the circuit to adapt to different operating conditions and minimize loss and delay for various phase requirements.
2Productivity
If passive phase shifting circuits are used, then beamforming capability is provided, but efficiency is reduced due to high loss and delay
Solution Approach 1:
By dynamically adjusting the capacitance parameters in the transmission line circuit, the invention optimizes the phase shifting characteristics for beamforming applications. This parameter adjustment enables more efficient signal routing and combining, thereby improving beamforming efficiency while reducing energy loss.
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 proposed solution achieves significantly lower insertion loss and group delay, enhancing the efficiency of phase shifting at millimeter wave frequencies, thereby improving beamforming capabilities in wireless communications.
Implementation Method 1
behave as an LC resonant circuit, reducing phase shift and group delay
Data Source
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AI summary
Certain aspects of the present disclosure provide apparatus for producing an output signal that may have a phase difference with respect to an input signal. One example phase shifting circuit for producing such an output signal generally includes a transmission line (4062) having first and second points (421,422), an impedance (4081) connected with a node (424) and with a reference voltage level (426), a first switch (SW1) connected with the first point of the transmission line and with the node, and a second switch (SW2) connected with the second point of the transmission line and with the node, wherein a first signal input to the first point of the transmission line has a phase difference with a second signal output from the second point based on one or more properties of the transmission line when the first and second switches are open.