Mechanical Waveguide Phase Shifter for Broadband High-Power RF
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Solution Overview
Problem
Current phase shifters for radio frequency signals, such as ferrite, MEMS, and mechanical phase shifters, face limitations in manufacturing complexity, heat dissipation, power handling capacity, bandwidth, and lifespan, making them unsuitable for high-power and wide-band applications in space telecommunications and radar systems.
Innovation Solution
A phase shifting device with a guided structure featuring a rectangular section where both electrical length and long side dimensions vary simultaneously, allowing for a single degree of freedom to control phase variation, reducing ohmic losses, and enabling high-power signal transmission across a wide frequency band through a rotational movement mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If ferrite phase shifters are used to achieve fast switching times, then switching speed is improved, but heat dissipation increases and structure becomes complex
Solution Approach 1:
The patent replaces the electromagnetic field control mechanism (ferrite with magnetic bias circuits) with a pure mechanical system. A movable support with conductive pads translates along the waveguide, mechanically adjusting the electrical length of the signal path. This mechanical substitution eliminates the need for complex magnetic bias circuits while achieving phase shifting, thereby reducing structural complexity and heat dissipation.
Solution Approach 2:
The patent changes the physical parameter being adjusted from magnetic permeability (in ferrite phase shifters) to electrical length of the signal path. By translating the movable support along the waveguide, the electrical length between fixed and movable conductive pads changes, producing phase shift. This parameter change enables simpler mechanical control without magnetic field circuits.
2Ease of manufacture
If slide-type phase shifters are used to simplify design, then manufacturing simplicity is improved, but bandwidth is limited
Solution Approach 1:
The patent introduces a dynamic element (movable support) that can be positioned at different locations along the waveguide. This dynamic adjustment of electrical length allows the phase shifter to operate effectively across a broader frequency bandwidth compared to static slide-type phase shifters, while maintaining mechanical simplicity.
3Ease of operation
If MEMS phase shifters are used to change geometry, then phase shift control is improved, but power handling capacity decreases and lifetime is limited
Solution Approach 1:
The patent employs robust mechanical components (conductive pads on movable support) that can withstand high power conditions. Unlike fragile MEMS microactuators, these mechanical elements are designed to handle high power signals without degradation, sacrificing the fine control precision of MEMS for superior power handling and durability.
4Reliability
If mechanical phase shifters with limited movement are used to prevent contact, then friction is reduced, but phase shift amplitude is limited
Solution Approach 1:
The patent extends the movement range along the longitudinal dimension of the waveguide. The movable support translates a significant distance along the waveguide's length, allowing large changes in electrical length and thus large phase shift amplitudes. This dimensional approach enables both large phase shift range and maintained reliability by keeping conductive pads from contacting.
Data Source
Figure 1A~1B
Figure 1C~2B
Figure 3~4
AI summary
[A radio frequency signal phase-shifting device, comprising a first support (SF) and a second support (SM), an input port (PE) and an output port (PS) for radio frequency signals, the input port (PE) and the output port (PS) being arranged on the first support (SF), the phase-shifting device comprising: a first array of conductive pads (RP1) distributed on the first support (SF) and extending from the input port (PE), a second array of conductive pads (RP2) distributed on the second support (SM), the first support (SF), the second support (SM), the first array of conductive pads (RP1) and the second array of conductive pads (RP2) being arranged to form a radio frequency signal guidance structure of variable length and having a rectangular cross-section,the first array of conductive studs (RP1) and the second array of conductive studs (RP2) being configured so that the length and cross-section of the guidance structure are modified, over at least part of the propagation path of the radio frequency signals in the guidance structure, when the second support (SM) moves relative to the first support (SF).