A5001686088- Microwave Engineering and Waveguides
- Electromagnetic Compatibility and Noise Suppression
- Advanced Antenna and Metasurface Technologies
- Radio Frequency Integrated Circuit Design
- Antenna Design and Analysis
- 3D IC and TSV technologies
- Microwave and Dielectric Measurement Techniques
- Photonic and Optical Devices
- Orbital Angular Momentum in Optics
- ICT Impact and Policies
- Electronic Packaging and Soldering Technologies
- Millimeter-Wave Propagation and Modeling
- Semiconductor Lasers and Optical Devices
- Copper Interconnects and Reliability
- Advanced MEMS and NEMS Technologies
- Energy Harvesting in Wireless Networks
- Advanced Power Amplifier Design
- Semiconductor materials and devices
- Acoustic Wave Resonator Technologies
- Antenna Design and Optimization
- Metamaterials and Metasurfaces Applications
- Near-Field Optical Microscopy
- Big Data and Business Intelligence
- Terahertz technology and applications
- Radio Astronomy Observations and Technology
The University of Texas at Dallas
2016-2025
University of Dallas
2014-2021
Community Connections
2019-2020
Institute of Electrical and Electronics Engineers
2018-2019
Alpha Omega Electromagnetics (United States)
2019
North Carolina Central University
2019
Universitat Politècnica de Catalunya
2018
Northrop Grumman (United States)
2018
Leibniz Institute for High Performance Microelectronics
2016-2018
University of California, Santa Barbara
2018
We report the fabrication and characterization of a reversible resonant frequency tunable antenna based on liquid metal actuation. The is composed coplanar waveguide fed monopole stub printed copper-clad substrate, tunnel-shaped microfluidic channel linked to metal. gallium-based can be injected withdrawn from in response an applied air pressure. treated with hydrochloric acid eliminate oxide layer, associated wetting/sticking problems, that arise exposure ambient environment. Elimination...
Electromagnetic waves in the millimeter- and sub-millimeter-wave frequency ranges are used fast-scan rotational spectroscopy to detect gas molecules measure their concentrations [1]. This technique can be for indoor air quality monitoring, detection of toxic leaks, breath analyses monitoring bodily conditions many others. paper reports a 210-to-305GHz receiver (RX) front-end spectrometer that achieves SSB noise figure (NF) 13.9 19dB by incorporating an on-chip antenna with reflector formed...
This paper presents pyramidal horn antennas operating at 28 GHz, which are manufactured by 3D printing technology. A printed antenna based on a WR-28 waveguide standard gain designed for 20 dBi is then metalized using two different methods. Copper tape and conductive copper paint applied to the geometry surface. full-wave electromagnetic simulator, HFSS, used design horns predict gain. Through simulation, we observe that dielectric loss impacts metallized structure. The measured input...
High precision metal-insulator-metal capacitors with a capacitance density of 1.6 fF/um/sup 2/ and metal thin film resistors 50 ohm/sq. sheet resistance negative temperature coefficient resistivity smaller than 100 ppm//spl deg/C have been integrated in dual-inlaid Cu-based backend for mixed-signal applications. These devices deliver reduced parasitics, better linearity, lower coefficients, noise, matching as compared to current silicon based devices.
With the development of fifth-generation (5G) network solutions and high-data communication systems, millimeter-wave frequencies are being proposed for their licensing bandwidth benefits. E-band radios at 71-76 81-86 GHz have recently been developed backhaul fixed point-to-point applications. Typically highgain, waveguide-based antennas used in these deployments. By utilizing polarization, data rates can be increased two-fold. Another way to increase systems on hardware side is through...
We present a short-range experimental orbital-angular-momentum (OAM) multiplexing millimeter-wave communication system using patch antenna arrays. The dependence of the evolution OAM beams on number array elements and radius are analyzed. also find phase delay deviation 30 degrees leads to mode purity degrading ∼1% power 6 dB reduces by <40%. An obstruction size <10mm has not much influence generated from arrays with r = 8mm, which enables stacking multiple use these demonstrate 60 GHz...
This letter presents a novel broadband planar antenna, the modified aperture bowtie. The design is based upon bowtie-shaped antenna fed with coplanar waveguide. and feed occupy single plane, making structure ideal for low-profile conformal applications. impedance bandwidth of increased by altering edge aperture. radiation was numerically modeled using FEKO HFSS electromagnetic solvers. constructed measured comparison to numerical solution. fabricated has 54% bandwidth, an increase 1.75 GHz...
This letter introduces a method of using patch antennas to generate millimeter-wave Hermite-Gaussian (HG) beams at E-band. An HG <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> beam is formed four inset-fed microstrip elements arranged with corporate feeding network. The designed are fabricated on high-performance FR4 circuit board relative permittivity 3.75 and loss tangent 0.018. overall size the antenna array 8 × 0.125 mm <sup...
High-frequency planar circuits experience large electromagnetic (EM) coupling in dense circuit environments. As a result, individual components exhibit performance degradation that ultimately limits overall response. This paper addresses crosstalk microstrip lines by evaluating micromachined packages as means to reduce coupling. Microstrip with straight and meandering paths can high -20 dB (i.e., when placed side-by-side arrangement). From our study, inclusion of monolithic package reduces...
A novel low-cost packaging approach is presented in this paper, which appropriate for high-frequency electronic circuits discrete, as well integrated, configurations. This based on silicon micromachining and can effectively provide on-wafer discrete high-quality high-precision miniature components. The required fabrication techniques are compatible with standard integrated-circuit processing and, reason, low costs. As an example, paper presents the development of a Ka-band package that...
This paper describes a systematic study of coplanar waveguide discontinuities that are requisite components high-frequency distribution networks. The specific geometries addressed air bridges, right-angle bends, tee junctions, and Wilkinson dividers. Relative to typical monolithic-microwave integrated-circuit designs, the studied herein electrically large in order minimize signal attenuation. size leads pronounced parasitic effects, emphasis this was optimize electrical performance using...
SU-8 2000 is an epoxy based photoresist widely used in the fabrication of MEMS for its thick film capability. also holds promise as a low cost material millimeter wave packaging and devices where films are required. This letter investigates electrical properties at frequencies beyond 140 GHz. Characterization using microstrip ring T resonators reveal dielectric constant 3.0 across entire band with approximate loss tangent 0.04.
A 400 MHz magnetoelectric (ME) Lamb wave antenna design to function in the medical implant communication service band is proposed. The employs a heterostructure of piezoelectric and magnetostrictive membranes acoustically excite standing shear bulk radiate as magnetic dipole. Multiphysics finite element analysis simulations are performed for transmission reception modes. In these simulations, three aspects investigated: piezoelectricity, micromagnetic precession, dipole radiation. An...
This study investigates an axial extension mode magnetoelectric antenna designed for near-field communication in dielectric cluttered environments. The configuration consists of two magnetostrictive Metglas-polymer composites bonded on opposite sides a PZT-5A actuator, creating dumbbell configuration. Operating at its 88 kHz mechanical resonance, the emits electromagnetic radiation near field by applying AC voltage to piezoelectric material, generating acoustic wave that propagates through...
A holey cladding dielectric waveguide with square cross section is designed, simulated, fabricated and characterized. The TOPAS designed to be single mode across the broad frequency range of 180 GHz 360 as shown by finite-difference time domain simulation robustly support simultaneous TE TM propagation. fiber geometry realized pulling through a heat distribution made appropriate furnace design. transmitted profile imaged using vector network analyzer pinhole at receiver module. Good...
This paper depicts the progress toward a novel high-quality-factor miniaturized resonator operating in 5.6-5.8-GHz range. The design of is based on micromachined cavity loaded with high dielectric-constant material. Energy coupled into from input and output microstrip lines via slots. Quality factors up to 640 are demonstrated silicon planar structures volume 177 mm/sup 3/. Further size reduction yields 24.5 3/ quality ranging 152 197, while keeping integration ability. Bonding techniques...
This paper describes the implementation and packaging of components, described in Part I this paper, to realize a three-dimensional W-band distribution network.
This paper introduces antenna arrays to generate mode 1 and 3 orbital angular momentum (OAM) radio beams at 73.5 GHz (E-band) using half wavelength dipoles. Design details are presented with the fabricated on 0.127 mm-thick high performance FR408 substrate relative permittivity of 3.75 loss tangent 0.018. ANSYS HFSS AWR AXIEM simulations have been used optimize array designs feeding networks. Measured results include |S11| (dB) across E-band far-field radiation patterns GHz. The measurements...
In this paper, we use commercial impulse radios and spiral phase plates to generate two different orbital angular momentum (OAM) beams from 71 GHz 76 GHz. addition, have experimentally demonstrated that those OAM can be multiplexed demultiplexed over the same frequency radio channel at 2 meters range. At time, channels work independently with crosstalk less than -15 dB bit-error-rate (BER) 9.65 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
In this paper, a novel unified equivalent-circuit model with silicon (Si)-substrate skin-effect modeling is demonstrated to describe the performance of coplanar waveguide (CPW) lines wide range dimensions and substrate resistivities, up 110 GHz. HFSS used simulate CPWs on 8000-, 15-, 0.015-Ω·cm resistivity Si substrates. The electric field distributions are analyzed compared, demonstrate that operation mode line different compared commonly quasi-TEM in high-resistivity A equivalent circuit...
The IEEE Microwave Theory and Techniques Society (MTT-S) Education Committee continues to offer high-quality webinars from experts in their respective fields through a series that started 2016. current scheduled for the first half of 2021 can be found Table 1, presented here. These speakers represent diverse group leading subject-matter around globe, including or emeritus Distinguished Lecturers.