Antennas on quasi synthetic media

Njoku, Chinwe C.; Whittow, William G.; Vardaxoglou, Yiannis

doi:10.1007/s00339-013-8026-3

Cited by 4 publications

(7 citation statements)

References 23 publications

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“…Note that

ɛ_{r,air} = 1

. In the event, the air‐solid arrangement was not as clear as core shown in Figure , and the equivalent dielectric constant was calculated using the equation given below . In this case, the void is considered distributed in solids.…”

Section: Ansys‐hfss Modelingmentioning

confidence: 99%

“…This work leverages our prior RF measurements results and delves deeper into the X‐ray images of the dielectric materials to understand the nature of anisotropy both in the lateral and thickness directions. Note that due to the layer‐by‐layer fabrication of fused deposition modeling (FDM) based 3DP process, the printed dielectrics are inherently uniaxially anisotropic having different permittivity in two orthogonal directions, for example in planar and thickness directions, depending upon the toolpath . The material can be printed using different in‐fill densities (or solid volume fraction) and the printed material becomes a three‐layer sandwich construction having top and bottom layers and core (Figure ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of heterogeneity in additively manufactured dielectric structures on RF response of microstrip patch antennas

Keerthi

Hamad

Mian

et al. 2017

Int J RF Microw Comput Aided Eng

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Microstrip patch antennas with a tunable radiofrequency (RF) response are a great candidate for additive manufacturing (AM) process. First, three separate sets of ABS samples were created at three different machine preset fill densities using an extrusion based 3D printer. Once fabricated, actual solid volume fraction of each set of samples was measured using a 3D X‐ray computed tomography microscope. It is observed that the factory preset fill‐density values are only applied to the core region and actual solid volume fractions for each sample set are different from printer‐preset values. Also, the printed materials appeared to exhibit anisotropy such that the thickness direction dielectric properties are different from the in‐plane properties (planar isotropy). Microstrip patch antennas created on the AM fabricated ABS were tested for resonant frequencies using a vector network analyzer (VNA). The measured resonant frequencies combined with ANSYS‐HFSS simulation were used to estimate bulk dielectric constant of ABS and equivalent dielectric properties in planar and thickness directions. It is observed that the antenna resonant frequency decreases with an increase in core solid volume fraction. Also, in‐plane permittivity appeared to have minimal effect on antenna resonant frequency, while the thickness direction properties have substantial effects.

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“…Note that

ɛ_{r,air} = 1

Section: Ansys‐hfss Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of heterogeneity in additively manufactured dielectric structures on RF response of microstrip patch antennas

Keerthi

Hamad

Mian

et al. 2017

Int J RF Microw Comput Aided Eng

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“…(Yiannis) C. Vardaxoglou E In [17], the simulated results of a patch antenna on a substrate with dielectric cubic inclusions and its homogenous equivalent gave good agreement. From Fig.…”

Section: Microstrip Patch Antennas With Anisotropic and Diamagnetic Smentioning

confidence: 89%

“…For initial validation of and thus obtained, the authors previously presented simulation results with patch antennas on heterogeneous substrates with 3D-symmetric inclusions -spheres and cubes [17], [18]. The use of patch antennas extends the and results from an infinite medium to a finite medium and places the substrate in close proximity to the source, creating a different route in exploring the robustness of heterogeneous substrates.…”

Section: Introductionmentioning

confidence: 99%

Microstrip Patch Antennas With Anisotropic and Diamagnetic Synthetic Heterogeneous Substrates

Njoku

Whittow

Vardaxoglou

2015

IEEE Trans. Antennas Propagat.

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This paper examines the performance of a rectangular patch antenna on heterogeneous substrates composed of metallic cuboid inclusions compared with homogenous substrates via simulations and measurements. The paper examines how the orientation of the inclusions affects the performance of the patch antenna. Anisotropy and diamagnetism of the heterogeneous substrate with metallic cuboid inclusions have been analyzed. As the resonant frequency of the patch is dependent on the electromagnetic (EM) parameters of its substrate(s), fixing the size of the patch and altering its substrates allows the EM properties of the substrates to be estimated and compared with predictions from theory and simulations.

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“…With the advancement of additive manufacturing, integrating 3D metamaterials into electromagnetic designs is becoming a more viable method of obtaining novel and innovative designs. Metamaterials exhibit material characteristics not normally found in nature which electromagnetic engineers can exploit to improve their designs; for example design miniaturisation [1] and wider bandwidths [2]. This paper presents the concept of utilizing meta-atom technology to design miniaturized antennas.…”

Section: Introductionmentioning

confidence: 99%