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Electric Field Tunable Multi-Ferroic Filters for C-band RF Applications
Navy SBIR 2011.1 - Topic N111-080
ONR - Mrs. Tracy Frost -
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.

1. P. Wong, I. Hunter, "Electronically Tunable Filters," IEEE Microwave Magazine. v. 10, pp.46-54 (2009).

2. W. J. Kim, W. Chang, S. B. Qadri, H. D. Wu, J. M. Pond, S. W. Kirchoefer, H. S. Newman, D. B. Chrisey, J. S. Horwitz, "Electrically and magnetically tunable device using (Ba, Sr) TiO3/Y3Fe5O12 multilayer," Appl. Phys. A 71, pp.7-10 (2000).

3. G. Srinivasan and Y. K. Fetisov, "Ferrite-piezoelectric layered structures: Microwave magnetoelectric effects and electric field tunable devices," Ferroelectrics 342, 65 (2006).

4. Ce-Wen Nan, M. I. Bichurin, S. Dong, D. Viehland, and G. Srinivasan, "Multiferroic magnetoelectric composites: Historical perspective, status and future directions," J. Appl. Phys. 103, 031101 (2008).

KEYWORDS: multi-ferroic; filter; ferrite; piezoelectric; electronic warfare; tunable

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