Magnetically Actuated MEMS Capacitor Switches in Laminate
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Solution Overview
Problem
Conventional silicon-based MEMS capacitive switches suffer from poor isolation, high loss, and fragility, making them unsuitable for high-power RF applications due to energy absorption, leakage, and self-actuation issues, which are exacerbated by the need for close plate proximity and thin membranes.
Innovation Solution
The development of magnetically actuated micro-electro-mechanical capacitor switches in laminate materials, comprising a coil layer, a flexible member with a permanent magnet, and a conductive plate with a dielectric coating, utilizing electromagnetic actuation to handle high signal powers and voltages with low voltage requirements and latched operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If silicon substrate is used for MEMS capacitive switches, then manufacturing precision and device stability are improved, but energy loss increases and isolation performance deteriorates due to substrate absorption and leakage
Solution Approach 1:
The patent extracts the device from the traditional silicon substrate and mounts it on a laminate substrate instead. This separation removes the lossy silicon substrate from the RF signal path, eliminating the energy absorption and leakage problems while maintaining manufacturing precision through the laminate construction approach.
Solution Approach 2:
The patent introduces a laminate substrate as an intermediary between the device and the final mounting structure. This laminate layer acts as a mediator that provides mechanical support and electrical isolation, preventing direct coupling to lossy substrates and reducing energy loss in the RF path.
2Power
If plate separation is reduced to increase capacitance, then switching capability is improved, but isolation performance deteriorates due to increased leakage and self-actuation
Solution Approach 1:
The patent employs composite construction with multiple layers including laminate substrate, conductive plates, and dielectric materials. This composite structure allows optimized plate separation distances while maintaining mechanical stability and electrical isolation, achieving both high switching capability and good isolation performance through the combined properties of different materials.
3Ease of operation
If thin membrane is used to reduce actuation voltage, then ease of operation is improved, but device strength and reliability deteriorate due to fragility
Solution Approach 1:
The patent utilizes thin film conductive plates deposited on the laminate substrate. These thin films provide the necessary flexibility for low-voltage actuation while the laminate substrate provides mechanical support, combining the advantages of thin membranes (low actuation voltage) with structural strength (high reliability).
Solution Approach 2:
The composite structure of laminate substrate with thin conductive film layers creates a device that is both mechanically robust and electrically functional. The laminate provides strength and stability while the thin films enable low-voltage operation, resolving the contradiction between ease of operation and device strength.
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 solution enables high-power RF switching with improved isolation, reduced self-actuation, and robust construction, capable of handling up to 100 W of RF power and exceeding 10 W signals on a 50 Ohm transmission line, while maintaining performance across varying temperatures.
Implementation Method 1
a first layer comprising a coil and magnetic element
Implementation Method 2
a second layer comprising a flexible member, wherein a permanent magnet is attached to the flexible member
Implementation Method 3
a conductive plate having an insulating dielectric coating, the conductive plate attached to one of the flexible member or the magnet
Data Source
AI summary
Magnetically actuated micro-electro-mechanical capacitor switches in laminate are disclosed. According to one embodiment, an apparatus comprises a first layer comprising a coil and magnetic element, the magnetic element made from one of nickel and iron; a second layer comprising a flexible member, wherein a permanent magnet is attached to the flexible member; a conductive plate having an insulating dielectric coating, the conductive plate attached to one of the flexible member or a magnet; and a third layer comprising a transmission line and magnetic material, wherein the transmission line comprises one or more of a signal conductor and one or more ground conductors in near proximity.