A5064694357- Antenna Design and Analysis
- Microwave Engineering and Waveguides
- Antenna Design and Optimization
- Advanced Antenna and Metasurface Technologies
- Radio Frequency Integrated Circuit Design
- Electromagnetic Compatibility and Noise Suppression
- Energy Harvesting in Wireless Networks
- Millimeter-Wave Propagation and Modeling
- Full-Duplex Wireless Communications
- Ultra-Wideband Communications Technology
- RFID technology advancements
- Gyrotron and Vacuum Electronics Research
- Photonic and Optical Devices
- Microwave and Dielectric Measurement Techniques
- Metamaterials and Metasurfaces Applications
- Power Line Communications and Noise
- Electromagnetic Compatibility and Measurements
- Experimental Learning in Engineering
- Semiconductor Lasers and Optical Devices
- Advanced Power Amplifier Design
- Advancements in PLL and VCO Technologies
- Mechatronics Education and Applications
- Engineering Education and Curriculum Development
- Acoustic Wave Resonator Technologies
- 3D IC and TSV technologies
National Taiwan University of Science and Technology
2015-2024
The Ohio State University
2023-2024
National Technical University of Athens
2022-2024
University of Illinois Chicago
2020-2022
University of Florida
2016
National Taiwan University
2004-2011
National Taipei University of Technology
2007
Hewlett-Packard (United States)
2003
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A miniaturized quadrature hybrid coupler, a rat-race and 4 <formula><tex>$\times$</tex></formula> Butler matrix based on newly proposed planar artificial transmission line are presented in this paper for application ultra-high-frequency (UHF) radio-frequency identification (RFID) systems. This is composed of microstrip quasi-lumped elements their discontinuities capable synthesizing lines with...
A novel planar tapered-slot-fed annular slot antenna is proposed in this paper. The utilizes a unique tapered-slot feeding structure and simultaneously possesses ultrawide bandwidth, almost uniform radiation patterns, low profile. It is, hence, adequate for ultrawide-band (UWB) applications. By means of normalized transfer function, both frequency domain time characteristics the are carefully investigated. Two measures, uniformity related to patterns fidelity associated with transient...
We propose a new band-notched folded strip monopole antenna for ultrawideband applications. This is composed of forked-shape radiator and 50 Omega microstrip line. To achieve band-rejected filtering property at the WLAN bands, strips are back result in pair coupled lines on radiator. The length gap width primarily determine notched frequency antenna. Based resonance, an equivalent circuit model proposed calculated input admittance agrees with full-wave simulation data. With help...
A compact dual-band three-pole Chebyshev filtering patch antenna with orthogonal polarizations in the two bands is developed for 2.4/5.8-GHz ISM-band applications. Step impedance resonators and aperture coupled feed techniques are integrated together to fulfill goal. The synthesis procedure discussed using formulation design curves. advantages of proposed design, including harmonic suppression controllable bandwidth, verified by experiments. According summary table, this antenna, realized...
Without the need of any transmission line, a very compact decoupling network based on reactive lumped elements is presented for two-element closely spaced array. The network, consisting two series and four shunt elements, can be analytically designed using even-odd mode analysis. In even mode, half-circuit identical to an L-section matching while in odd it equivalent π-section one. proposed deal with conditions modes independently so as simultaneously achieve good impedance port isolation...
In this paper, we present a new coplanar waveguide-fed tapered ring slot antenna for ultrawideband (UWB) applications. This consists of 50 /spl Omega/ waveguide feeding line, wideband waveguide-to-slotline transition, and pair curved radiating slots. The impedance bandwidth with VSWR<2 is from 3.1 GHz to more than 12 GHz. actual operating is, however, limited by the distortion radiation patterns. Such pattern can be attributed mode transition investigated in paper help patterns traditional...
A new beam-switching array system, capable of providing four sets switchable beams, is proposed and demonstrated. The core building block for fulfilling the design phase reconfigurable synthesized transmission line (PRSTL), whose electrical length switched between two states as a 1-bit shifter. By cascading PRSTLs to outputs standard Butler matrix, progressive shifts adjacent antenna elements can be controlled in variety fashions. aims provide low-complexity solution expand beam...
In this paper a planar antenna is studied for ultrawide-band (UWB) applications. This consists of wide-band tapered-slot feeding structure, curved radiators and parasitic element. It modification the conventional dual exponential tapered slot can be viewed as printed dipole with feed. The design guideline introduced, parameters including return loss, radiation patterns gain are investigated. To demonstrate applicability proposed to UWB applications, transfer functions transmitting-receiving...
We propose a slotted bow-tie antenna with pattern reconfigurability. The consists of coplanar waveguide (CPW) input, pair reconfigurable CPW-to-slotline transitions, Vivaldi-shaped radiating tapered slots, and four PIN diodes for With suitable arrangement the bias network, proposed demonstrates radiation patterns in frequency range from 3.5 to 6.5 GHz three states: broadside fairly omnidirectional two end-fire radiations whose main beams are directed exactly opposite directions. is...
We investigate an innovative decoupling network for dual-band two-element closely spaced arrays in MIMO applications. The new architecture, combining the reactive element technique and eigenmode feed network, provides with good radiation characteristics power balance between modes. core block of is a dual-mode 180-degree hybrid coupler; it functions as conventional coupler one frequency band but can be equivalent to pair isolated direct-thru transmission lines other band. This unusual...
We propose a new printed dipole antenna for ultra high frequency (UHF) radio identification (RFID) systems in North America. The consists of microstrip-to-coplanar stripline transition, meandered driven dipole, closely-coupled parasitic element, and folded finite-size ground plane. geometry, design concept, simulated measured results are carefully discussed throughout the paper. experimental demonstrate that proposed features compact size, wide impedance bandwidth, moderate gain, excellent...
By placing a loop radiator over truncated ground plane, self-oscillating active integrated antenna with quasi-isotropic radiation is proposed in this communication. The comprises and an unstable transistor direct integration. As the partially shielded, equivalent electric magnetic dipole moments can be generated simultaneously, therefore giving rise to nearly uniform terms of total field. design concept first introduced, followed by simulation scheme experimental results. measured...
A stub-loaded reactive decoupling network is investigated in this letter for two-element closely spaced array. The proposed topology, consisting of a pair connecting lines and T-shaped neutralized section, developed based on the even/odd-mode analysis. scheme able to deal with matching requirements even odd modes separately and, hence, achieve overall good impedance excellent port isolation simultaneously an arbitrary design concept, formulation, experimental results will be introduced.
We present a new multiresonator loaded band-rejected planar monopole antenna for ultrawideband applications. The proposed microstrip-fed is composed of flared metal plate, truncated ground plane, and two pairs folded strips. By applying the resonance nature strips associated cross coupling effects, demonstrates bandstop-filter-like response with bandwidth controllability at targeted rejection band. To illustrate operating mechanism more clearly, an equivalent circuit model consisting RLC...
A miniaturized common-mode (CM) filter, implemented by coupled synthesized microstrip lines and modified mushroom resonators, is proposed validated on a three-layer printed circuit board. Four identical unit cells with synthesis equations are developed cascaded. According to the experiments, this filter provides good compromise between size electrical performance; it second smallest design ever reported but better CM suppression wider differential-mode operating bandwidth.
This paper presents an ultra-wideband (UWB) medium power amplifier (MPA) and a broadband high-power (HPA) operating at the 5G/6G frequency bands. By using <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.15~\mu \text{m}$ </tex-math></inline-formula> GaAs pseudomorphic high electron mobility transistor (pHEMT) technology process, proposed UWB MPA delivers average small-signal gain of 16.5 dB, saturation...
A frequency-agile pattern-reconfigurable self-oscillating active integrated antenna (AIA) is investigated in this paper. With the aid of two PIN diodes and a varactor, proposed shows pattern reconfigurability frequency tunability at same time. The antenna, composed monopoles semi-ring radiator, can be switched between four states, with featuring omnidirectional patterns other having end-fire radiation. polarizations states are spatially orthogonal to each other. By embedding varactor diode,...
With a direct integration of field effect transistor (FET) into C-shaped ring radiator, novel miniaturized self-oscillating annular active integrated antenna is proposed and investigated in this paper. The approach provides solid basis for the miniaturization while slow-wave loading from unstable further enhances reduction ratio. It makes design show an extraordinarily compact size 0.041λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g</sub>...
A compact frequency-agile self-oscillating semi-ring active integrated antenna is presented and investigated. Without changing the circuit footprint, proposed achieves frequency reconfigurability voltage-controllability simultaneously with a PIN diode, varactor proper biasing network. The oscillation can be controlled from 4.47-4.85 GHz in OFF state 5.03-5.33 ON state. VCO gains are 17.7 16.4 MHz/V two states. Benefitting feedback path, antenna, miniature size of 0.046λ <sub...
We investigate a new topology for realizing compact frequency-reconfigurable self-oscillating active integrated antenna. The design consists of passive ring radiator, an unstable transistor, and two p-i-n diodes. Two gaps are etched across the with diodes bridging to switch antenna topology. By properly selecting location gap respect gate/drain terminals, oscillation can be stabilized at distinct frequencies, each associated resonance mode radiator. simulated methods experimental results...