Properties of aluminum-substituted YIG with applications in tunable notched UWB antennas

Varouti, E.; Rongas, Dimitrios K.; Manios, E.; Kakoyiannis, Constantine G.; Zervos, T.; Pissas, M.; Fikioris, George

doi:10.1109/lapc.2014.6996494

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…Magneto-dielectric antennas (MDAs) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] have gained attention over the past 20 years because their careful design yields more versatile radiators than their dielectric counterparts. A magneto-dielectric substrate features Re{ε r , μ r } >1 and thus, for example, planar MDAs can offer significantly reduced electrical sizes [3-5, 7, 9]: the scaling factor is the inverse of…”

Section: Introductionmentioning

confidence: 99%

“…Since directivity is directly related to the physical antenna aperture, often the only way to increase the antenna gain is to improve its efficiency, η rad , especially in compact antennas. Studies reporting numerical and/or measured data on MDA efficiency are generally limited [5][6][7][8][9][10][11][12][13][14][15][16][17]. These studies provide certain hints w.r.t.…”

Section: Introductionmentioning

confidence: 99%

“…The iron-doped PLA filament is a commercial-off-the-shelf (COTS) product [22]. Iron exhibits a remanence in the range B r = 0.25-1.3 T hence does not require a permanent external magnetic bias, which can be a challenge when building ferrite-based MDAs [1,12,13,16]. Overall, if a 3D printer is available, the concept in [21] is the cheapest, fastest, and simplest way to build an actual MDA.…”

Section: Introductionmentioning

confidence: 99%

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Microstrip antennas on 3D-printed magneto-dielectric substrates: fabrication and efficiency study

Kakoyiannis

Sorocki

Piekarz

et al. 2023

Int. J. Microw. Wireless Technol.

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Magneto-dielectric antennas (MDAs) provide small sizes, enhanced bandwidths, and frequency/polarization agility. We describe the fabrication and efficiency characterization at 0.4–0.8 GHz of five microstrip MDAs, whose gradually thicker substrates were 3D-printed using an off-the-shelf polylactic acid (PLA) filament doped with ferromagnetic particles. It was experimentally discovered that efficiency increases monotonically from 12% (−9.2 dB) to 37% (−4.3 dB) as substrate thickness goes from 1.6 to 4.3 mm; the rate is faster than expected for microstrip antennas. Numerical analysis indicated that the apparent magnetic loss tangent of the MD substrate experiences a threefold decrease as the 3D printer deposits more layers of iron-doped PLA. The MDAs exhibit radiation quality factors that are 3.7–7.2 times better than the dielectric counterparts. Moreover, a simple optimization of ground plane size could increase efficiency to 55% (−2.6 dB). The reduction in magnetic loss is attributed to a reduction in eddy current loss due to the separation of agglomerate iron particles. Therefore, despite the inherently lossy material used, the potential of 3D-printed MD substrates in providing acceptable antenna efficiencies is demonstrated together with unprecedented design freedom and fabrication flexibility.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microstrip antennas on 3D-printed magneto-dielectric substrates: fabrication and efficiency study

Kakoyiannis

Sorocki

Piekarz

et al. 2023

Int. J. Microw. Wireless Technol.

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“…1,3,[13][14][15][16][17] Further, Varactor diodes, PIN diodes, variable capacitors, optically controlled switch, magnetodielectric materials and microelectro-mechanical systems (MEMS) have been also used to achieve reconfigurable operation in UWB antennas with band-notch characteristics. 3,[18][19][20][21][22][23] The aforementioned designs have a common drawback that has not been assessed meticulously, that is, all these designs have a spiculate curve for notch band…”

mentioning

confidence: 99%

A planar CPW fed UWB antenna with dual rectangular notch band characteristics incorporating U‐slot, SRRs , and EBGs

Kumar

Singh

Kumar

2021

Int J RF Microw Comput Aided Eng

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In this article, a planar ultra-wideband (UWB) antenna with dual rectangular notchband characteristics (ie, GHz) is presented.The two-notch bands are chosen based on various wireless applications operating in C-band and X-band. The size of the antenna is very compact (25 × 25 × 1.6 mm 3 ) and is designed on a low-cost FR4 substrate. Co-planar waveguide (CPW) feed and beveling techniques are utilized for achieving the UWB operation. In order to yield the first rectangular notch, a U-slot and a pair of split-ring resonators are embedded into the radiating patch and the backside of the design, respectively. The coupling between these two structures is adjusted so as to achieve a rectangular band-notch operation. The second rectangular notch has been achieved by introducing the two mushroom type electromagnetic band-gap structures on the opposite side of the CPW feed. The parametric analysis for controlling band notches, time-domain analysis, and filter synthesis is also presented. Finally, simulated as well as measured results of S 11 , gain, radiation pattern, group delay, and total efficiency are demonstrated to show the suitability of this design for UWB systems. K E Y W O R D Sco-planar waveguide (CPW), electromagnetic bandgap (EBG), fidelity factor, filter synthesis, rectangular notch, split ring resonator (SRR) | INTRODUCTIONUltra-wideband (UWB) technology provides a unique solution in the field of high-speed short-range indoor communication. [1][2][3][4][5][6] However, it is still a major challenge to avoid interference with already existing bands in the UWB spectrum, such as , 5.8 GHz), X-band downlink, and uplink for satellite communication and 7.9 GHz to 8.4 GHz), C-band uplink and downlink for satellite communication (5.925-6.425 GHz and 3.7-4.2 GHz), and ITU-R (7.725-8.50 GHz). 3,4 Thus, UWB antennas should possess band notch characteristics. [5][6][7][8][9] Multiple design techniques have been provided in the literature for achieving band-notch characteristics in the UWB antennas, that is, slot and parasiticelementloading, 10,11 using fractals, 12 embedding split-ring resonators (SRRs) and electromagnetic bandgap (EBG) structures. 1,3,[13][14][15][16][17] Further, Varactor diodes, PIN diodes, variable capacitors, optically controlled switch, magnetodielectric materials and microelectro-mechanical systems (MEMS) have been also used to achieve reconfigurable operation in UWB antennas with band-notch characteristics. 3,[18][19][20][21][22][23] The aforementioned designs have a common drawback that has not been assessed meticulously, that is, all these designs have a spiculate curve for notch band

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A systematic Mössbauer spectroscopy study of Y3Fe5O12 samples displaying different magnetic ac-susceptibility and electric permittivity spectra

Varouti

Devlin

Sanakis

et al. 2020

Journal of Magnetism and Magnetic Materials

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Properties of aluminum-substituted YIG with applications in tunable notched UWB antennas

Cited by 6 publications

References 9 publications

Microstrip antennas on 3D-printed magneto-dielectric substrates: fabrication and efficiency study

Microstrip antennas on 3D-printed magneto-dielectric substrates: fabrication and efficiency study

A planar CPW fed UWB antenna with dual rectangular notch band characteristics incorporating U‐slot, SRRs , and EBGs

A systematic Mössbauer spectroscopy study of Y3Fe5O12 samples displaying different magnetic ac-susceptibility and electric permittivity spectra

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