A Ferrite LTCC Based Dual Purpose Helical Antenna Providing Bias for Tunability

Ghaffar, Farhan A.; Shamim, Atif

doi:10.1109/lawp.2014.2382608

Cited by 20 publications

(20 citation statements)

References 10 publications

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“…This is the plane where the connector of the antenna is mounted due to which the maximum gain of the antenna is at  = 15, instead of  = 0. This is consistent with the previous reported work on tunable antennas where the size of the antenna is actually smaller than the connector [13], [14].…”

Section: B Gain and Radiation Pattern Measurementssupporting

confidence: 89%

“…This value is low as compared to the simulated value of 3.0 dBi. As discussed before, this low gain performance from the antenna is due to the high surface roughness value (4.5 m) measured for the substrate and the conductor [14], [15]. In order to verify this effect, the measured surface roughness value is used in the simulator for the post-measurement simulations.…”

Section: B Gain and Radiation Pattern Measurementsmentioning

confidence: 99%

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Design and Fabrication of a Frequency and Polarization Reconfigurable Microwave Antenna on a Printed Partially Magnetized Ferrite Substrate

Ghaffar

Vaseem

Roy

et al. 2018

IEEE Trans. Antennas Propagat.

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Abstract-Design of a polarization reconfigurable and frequency tunable patch antenna operating in the partially magnetized state of a ferrite substrate is presented in this paper. A low cost additive manufacturing process based on a custom iron-oxide magnetic ink (to realize the magnetic substrate) and a silver-organo-complex metallic ink (to realize the antenna) has been used to demonstrate a novel fully printed magnetically controlled antenna. The magnetic substrate is characterized for its magnetostatic and microwave properties. The ink shows a saturation magnetic flux density of 156 mT with a squareness of 0.26. A prototype patch antenna at 6 GHz is implemented on the magnetic substrate using inkjet printing. When excited by an external magnetic field the antenna shows frequency splitting and polarization reconfigurability. The measured results agree well with the simulation model of the antenna in the partially magnetized state. A maximum tuning range of 16.7% and 5% for the two splitted frequency points is obtained with circular polarizations of opposite sense. The results show the viability of reconfigurable and tunable RF components on partially magnetized substrates through low cost additive manufacturing techniques.

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Section: B Gain and Radiation Pattern Measurementssupporting

confidence: 89%

Section: B Gain and Radiation Pattern Measurementsmentioning

confidence: 99%

Design and Fabrication of a Frequency and Polarization Reconfigurable Microwave Antenna on a Printed Partially Magnetized Ferrite Substrate

Ghaffar

Vaseem

Roy

et al. 2018

IEEE Trans. Antennas Propagat.

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“…is the operating frequency and n is the coefficient expressing the deviation of  from Rado's model [16]. For this work, ESL40012 is used as a substrate for the phase shifter design, which has a saturation magnetization M s of 4000 G corresponding to a magnetization frequency (f m =4 ) of 11.2 GHz [17]- [19]. Operating at a frequency higher than f m eliminates the low field losses associated with ferrite substrates.…”

Section: Concept and Theory Of A Ferrite Based Half Mode Waveguidmentioning

confidence: 99%

A Partially Magnetized Ferrite LTCC-Based SIW Phase Shifter for Phased Array Applications

Ghaffar

Shamim

2015

IEEE Trans. Magn.

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The theory and design of a half mode SIW ferrite LTCC based phase shifter is presented in this work. Unlike typical ferrite based designs, the biasing is done through embedded windings in a multilayer substrate which not only obviates the requirement of bulky electromagnets but also prevents loss of bias fields at the air-to-ferrite interface. The phase shifter is operated in the partially magnetized state of ferrite substrate. Through the combined effect of embedded windings, half mode waveguide operation and partially magnetized state, the required bias fields have been reduced by 90% as compared to conventional ferrite based designs employing electromagnets. A complete analytical model, backed up by electromagnetic simulations and measured results from a prototype, is presented in this paper. The fabricated prototype demonstrates a phase shift of 83.2 at a center frequency of 13.1 GHz and a figure of merit of 83.2/dB. As a proof-of-concept, the proposed phase shifter design is monolithically integrated with a twoelement antenna array to demonstrate a measured beam steering of 30. The phase shifter design is highly efficient in terms of required bias fields, has a small form factor and can be easily integrated with other electronic components and systems.

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“…In Refs. and , ferrite layers are embedded in the substrate of patch or helical antennas, respectively, and both of them achieve 10% of tunable frequency range. Because of the features of light weight, low profile, high Q factor, and easiness to integrate with other circuits, substrate integrated waveguide (SIW) has been used in RA designs, for example, SIW‐RA using varactors has a tunable frequency range from 4.13 to 4.50 GHz .…”

Section: Introductionmentioning

confidence: 99%

Realizing frequency reconfigurable antenna by ferrite-loaded half-mode SIW

Lou

Meng

et al. 2017

Microw. Opt. Technol. Lett.

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We propose and experimentally demonstrate a frequency reconfigurable antenna using ferrite loaded half‐mode substrate integrated waveguide (SIW). The antenna design is based on a SIW cavity with an embedded ferrite slab, which causes the resonant frequency of the cavity tunable under bias magnetic field. The antenna features omni‐direction radiation and small size. A prototype antenna is designed and fabricated. The measurements show the tunable frequency bandwidth is over 11% covering frequencies 5.04–5.62 GHz in low bias magnetic field region, and 5% covering 4.28–4.5 GHz in high bias magnetic field region. The measurement is in good agreement with simulations. The gain of antenna is all over 1.6 dBi, and the frequency reconfiguration does not affect the radiation pattern of the antenna, providing a preferable feature for frequency reconfigurable antenna. This type of antenna may be a good candidate for practical applications such as base stations and satellites. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1365–1371, 2017

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A Ferrite LTCC Based Dual Purpose Helical Antenna Providing Bias for Tunability

Cited by 20 publications

References 10 publications

Design and Fabrication of a Frequency and Polarization Reconfigurable Microwave Antenna on a Printed Partially Magnetized Ferrite Substrate

Design and Fabrication of a Frequency and Polarization Reconfigurable Microwave Antenna on a Printed Partially Magnetized Ferrite Substrate

A Partially Magnetized Ferrite LTCC-Based SIW Phase Shifter for Phased Array Applications

Realizing frequency reconfigurable antenna by ferrite-loaded half-mode SIW

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