Magnetic field tunable 18–36 GHz dielectric bandpass filter

Popov, M. A.; Murthy, D. V. B.; Zavislyak, I. V.; Srinivasan, G.

doi:10.1049/el.2011.3455

Cited by 17 publications

(12 citation statements)

References 6 publications

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“…In Table I, a comparison between this filter and other reported designs is presented [13]. This filter is considerably smaller than all the other designs because it is the only one with the embedded bias windings.…”

Section: Measurements and Discussionmentioning

confidence: 99%

Tunable Bandpass Filter Based on Partially Magnetized Ferrite LTCC With Embedded Windings for SoP Applications

Arabi

Ghaffar

Shamim

2015

IEEE Microw. Wireless Compon. Lett.

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Tunable filters that are based on ferrite materials often require large and bulky electromagnets. In this work, we present a tunable filter in the Ku-band, which is realized in multilayer ferrite LTCC substrate with embedded bias windings, thus negating the need of a large electromagnet. Also, because of the embedded windings, the bias fields are not lost at the air-substrate interface and therefore the field and current requirements are reduced by an order of magnitude as compared to the previously reported filters. A simulation strategy that uses full permeability tensor with arbitrarily directed magnetic fields has been used to model the filter on a partially magnetized ferrite substrate. Special attention has also been paid to approximate the non-uniform magneto-static fields produced by the embedded windings. The complete design is implemented in 10 layers of ferrite LTCC, making it the first magnetically tunable filter with embedded windings and extremely small size [(5 5 ) ]. The filter demonstrates a measured tunability of 4% and an insertion loss of 2.3 dB. With the small form factor, embedded windings, and low bias requirements, the design is highly suitable for compact and tunable SoP applications.Index Terms-Bandpass filter (BPF), ferrite, low temperature co-fired ceramics (LTCC), system on package (SoP).

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Section: Measurements and Discussionmentioning

confidence: 99%

Tunable Bandpass Filter Based on Partially Magnetized Ferrite LTCC With Embedded Windings for SoP Applications

Arabi

Ghaffar

Shamim

2015

IEEE Microw. Wireless Compon. Lett.

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“…The low-frequency mode at f r2 that shows the desirable high-Q was then utilized for band-pass filters that are discussed next [20]. Figure 1 shows the band-pass filter design.…”

Section: Dielectric Modes and H-tuningmentioning

confidence: 99%

“…Devices such as filters based on FMR in YIG show low-loss and broadband tuning with a magnetic field [1]. At frequencies above X-band, however, YIG-based devices require a large bias magnetic field H. For example, H 5 8-14 kOe requiring kW power for operation is essential for a tunable filter over [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] GHz and such devices cannot be miniaturized or integrated with semiconductor devices. Similarly, ferroelectrics are of interest for electric field tunable microwave filters and resonators based on dielectric resonance.…”

Section: Introductionmentioning

confidence: 99%

“…Theories of magnetically tunable dielectric resonance in magnetic materials were developed in the past [12][13][14][15][16][17]. We recently studied dielectric resonance over 50-110 GHz in YIG and barium ferrites, developed theories for their H-tuning, and designed and characterized phase shifters and isolators based on the excitations [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Dielectric resonance in nickel ferrite for K and Ka-band filters

Popov

Zavislyak

Murthy

et al. 2014

Microw. Opt. Technol. Lett.

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The nature of dielectric resonance and its utility for a magnetic field tunable band‐pass filter have been studied in a polycrystalline disk of nickel ferrite. The lowest order dielectric resonance manifests as two modes corresponding to clockwise and counter‐clockwise polarization of the microwave fields. Under the influence of a static magnetic field perpendicular to the disk plane, one of the modes show a decrease in frequency whereas the other shows an increase in frequency. With increasing H, the frequency separation increases. Band‐pass filters for operation at 19, 30, and 35 GHz have been designed and characterized. The filter central frequency has been controlled with proper choice of disk dimensions. The filter frequency is tuned with H, by 2–7%. As the filter frequency is well above the ferromagnetic resonance frequency expected for the static magnetic fields, the overall losses are small with the insertion loss ranging from 2 to 5 dB. Theoretical estimates of H‐tuning of dielectric resonance and pass‐band are much higher than measured values, indicative of potential for further improvement in filter performance. The ferrite filters are of importance for use in the K and Ka‐band communication devices. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:814–818, 2014

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“…But there are also other ferrite materials that are composed of iron oxides together with various other elements including aluminium, cobalt, manganese and nickel. In [58], a magnetically tunable dielectric bandpass filter based on nickel ferrite was presented. The filter is tunable from 18-36 GHz and has an insertion loss between 2-5 dBm.…”

Section: Tunable Filters Using Ferromagnetic Materialsmentioning

confidence: 99%

Developing One-Dimensional Electronically Tunable Microwave and Millimeter-Wave Components and Devices Towards Two-Dimensional Electromagnetically Reconfigurable Platform

Adhikari

Wu²

2013

PIER

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Abstract-An overview of state-of-the-art frequency tunable technologies in the realization of tunable radio frequency (RF) and microwave tunable circuits is presented with focus on filter designs. Those enabling techniques and materials include semiconductors, microelectro-mechanical systems (MEMS), ferroelectric and ferromagnetic materials. Various performance indicators of one-dimensional tunable filters are addressed in terms of tunability, losses, signal integrity and other aspects. Fundamental limitations of the classical one-dimensional tuning method are discussed, which makes use of only one type of tunable elements such as either electric or magnetic tuning/controlling of circuit parameters. Requirements of simultaneous electric and magnetic two-dimensional tuning techniques are highlighted for achieving an unprecedented and advantageous wider modal tuning. It is believed that this emerging scheme will lead its way in the realization of future highly efficient and tunable RF and microwave components and devices.

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Magnetic field tunable 18–36 GHz dielectric bandpass filter

Cited by 17 publications

References 6 publications

Tunable Bandpass Filter Based on Partially Magnetized Ferrite LTCC With Embedded Windings for SoP Applications

Tunable Bandpass Filter Based on Partially Magnetized Ferrite LTCC With Embedded Windings for SoP Applications

Dielectric resonance in nickel ferrite for K and Ka-band filters

Developing One-Dimensional Electronically Tunable Microwave and Millimeter-Wave Components and Devices Towards Two-Dimensional Electromagnetically Reconfigurable Platform

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