Electric Field Tunable Multi-Ferroic Filters for C-band RF Applications
Navy SBIR 2011.1 - Topic N111-080
ONR - Mrs. Tracy Frost - firstname.lastname@example.org
Opens: December 13, 2010 - Closes: January 12, 2011
N111-080 TITLE: Electric Field Tunable Multi-Ferroic Filters for C-band RF Applications
TECHNOLOGY AREAS: Materials/Processes, Sensors, Electronics
ACQUISITION PROGRAM: IMS (Integrated Warfare Systems - Radar component) TBD
OBJECTIVE: Develop and demonstrate electric field tunable multi-ferroic material based filters for C-band RF applications with state of the art tunability, loss and linearity.
DESCRIPTION: Modern RF electronics continually push the performance envelope for power, bandwidth, linearity and efficiency. With increasing bandwidth availability, signal selectivity in a sea of clutter becomes increasingly important. Tunable filters are used to increase the signal to noise ratio across a spectrum of desired frequencies. Semiconductor varactors are typically used with good results for these applications but are limited by loss and linearity above UHF. MEMS-based filters and YIG resonator filters are limited by tuning speed.
Multi-ferroic materials provide an appealing alternative tunable filter technology by combining the tunability of ferrite materials with voltage control and miniature size. Electric field tuning in devices based on multi-ferroic materials arises from the coupling of a ferroic material to a piezo-electric material. Recent demonstration of voltage tuning of a composite multi-ferroic ferrite-piezoelectric resonators is significant in this regard. When bilayers of yttrium iron garnet (YIG)-lead zirconate titanate (PZT) and YIG/lead magnesium niobate–lead titanate (PMN-PT) bilayers are subjected to an electric field, mechanical deformation in the piezoelectric produces a frequency shift in the magnetic response of the ferrite. Such electrical tuning is rapid, requires minimal power, and has the potential to be integrated in a hybrid manner with other circuits.
It can be expected that device improvements that build on existing experiments will lead to a laboratory demonstration of multi-ferroic filters exhibiting reasonable power handling and low insertion loss, in a compact, easily hybridized form. The goal of this program is to utilize multi-ferroic devices in C-Band (5-7 GHz) filter devices. Successful proposals will support a fully connectorized filter demonstration with the following characteristics: a 3rd-order Chebychev bandpass filter shape, a tuning range > 33% (5-7 GHz), a fractional 3-dB bandwidth < 10%, a passband insertion loss < 3 dB, IIP3 > 40 dBm, P1dB: > 20 dBm, and tuning speed < 10 µs.
PHASE I: Demonstrate, using test results of the performance of suitable multi-ferroic devices, that the filter along with its required dc magnetic field bias having the specifications listed in the description above may be successfully fabricated in a multi-functional based planar technology.
PHASE II: Fabricate, test, and deliver two multi-ferroic filters in a conventional connectorized microwave fixture, with integrated planar dc magnetic bias, meeting the specifications of Phase I, along with a compatible control interface suitable for laboratory demonstration.
PHASE III: Target industrial partners for technology transition with potential integration into one or more Navy systems.
PRIVATE SECTOR COMMERCIAL POTENTIAL/DUAL-USE APPLICATIONS: The proposed technology is expected to result in a high level of interest in these circuits for current and future generation electronic warfare and radar systems.
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KEYWORDS: multi-ferroic; filter; ferrite; piezoelectric; electronic warfare; tunable