Browsing by Author "Tsai, Zuo-Min"

Now showing 1 - 6 of 6

Application of a two-dimensional Butler matrix antenna array for tile-based beamforming
(2019-06-10)
Hsieh, Cheng-Hung
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Lin, Yi-Ting
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Jhan, Hsaing-Chieh
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Tsai, Zuo-Min
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電機工程學系
This paper proposes a new two-dimensional (2D) Butler matrix antenna array with 16 switching beams for tile-based beamforming. This study fabricated and assembled a 3.5-GHz Butler switching antenna array using multilayer Rogers printed circuit board technology. It adopted a new design concept and layer-by-layer vertical connection architecture. This 2D Butler matrix antenna array does not require long coaxial cables to connect functional circuit interfaces, which is an improvement over the traditional Butler matrix beamforming network (BFN) antenna array and may facilitate considerable reductions in circuit volume and complexity.
Design of an ultra-compact lowpass filter with ultra-sharp roll-off for UHF application
(2019-09-10)
Hsieh, Cheng-Hung
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Tsai, Zuo-Min
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電機工程學系
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Department of Electrical and Computer Engineering
This letter proposes a UHF lowpass filter based on the image parameter method. This study designed, fabricated and assembled a 0.48-GHz semilumped lowpass filter using low cost FR4 substrate. It adopted a new layout concept for the air wound coils to achieve the purposes of compact size and good performances. The proposed UHF lowpass filter has the best performances for the roll-off rate and circuit size compared to previous works, and it also achieves the best figure of merit 973,369.
Differential Low Noise Amplifier for S-Band Phased-Array Radar in 0.18-mu m CMOS Technology
(2019-01-01)
Hsia, Tzu-Yu
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Li, Xin-Yi
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Yang, Liang-Yu Ou
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Tsai, Zuo-Min
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Chen, Shih-Yuan
An S-hand differential low noise amplifier (DLNA) is presented and implemented in TSMC 0.18-mu m CMOS process for use in the receiver of a phased-array radar. A special layout approach is used in the input matching circuit by integrating two individual inductors together to shrink the chip area while increasing the inductances. The 3-dB gain bandwidth of the two-stage DLNA ranges from 1.9 to 4 GHz (72.41%). The measured gain is about 18.5 dB with an average in-band noise figure of 5.77 dB. The chip area is 0.4672 mm(2).
Hardware-Based Courseware for Teaching the Theory of Transmission Lines
(2019-02-01)
Tsai, Zuo-Min
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Wang, Yu-Syuan
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交大名義發表
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National Chiao Tung University
This article presents a hardware-based courseware package for use in teaching transmission line (Tline) theory. The hardware components include large inductors and capacitors that are used to slow down the speed of signals in the Tline and LEDs to allow the slowed-down signals to be observed by the human eye. This courseware can be used to augment the laboratory work in electromagnetic courses that teach Tline theory or for experimentation in microwave circuits, such as open/short stubs, branch line couplers, or Wilkinson dividers. A workshop was conducted to collect feedback on the proposed courseware from students after they had received instruction in Tline theory using both software-based and the proposed hardware-based courseware. In their feedback, the majority of students expressed more interest in the proposed hardware-based courseware than in the conventional software-based courseware.
High Ranging Accuracy and Wide Detection Range Interferometry Based on Frequency-Sweeping Technique With Vital Sign Sensing Function
(2018-09-01)
Liu, Tsung-Hsin
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Hsu, Miao-Lin
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Tsai, Zuo-Min
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交大名義發表
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National Chiao Tung University
In this paper, an interferometry-based frequency-sweeping technique has been developed and demonstrated. With this approach, the distance ambiguity problem in the traditional interferometer is solved. The relationship involving the used carrier number, noise and standing wave effects, the root-mean-square error, and the maximum unambiguous range are illustrated and discussed. The detection error caused by the noise and the standing wave effects is effectively reduced by properly increasing the used carrier number within the same bandwidth. The experiment indicates that the maximum detection error of a metal reflector detection is below 23 mu m at a distance of S m. In addition, the vital sign sensing experiments are demonstrated. With this approach, the motion amplitude and frequency of the respiration and the heartbeats are constructed.
Millimeter-wave Field Experiments with Many Antenna Configurations for Indoor Multipath Environments
(2017-01-01)
Comiter, Marcus
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Crouse, Michael
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Kung, H. T.
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Tarng, Jenn-Hwan
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Tsai, Zuo-Min
Next-generation wireless networks, such as 5G networks, will use millimeter waves (mmWaves) operating at 28 GHz, 38 GHz, 60 GHz, or higher frequencies to deliver unprecedentedly high data rates, e.g., 10 gigabits per second. Due to high attenuation at this higher frequency, use of directional antennas is commonly suggested for mmWave communication. It is therefore important to study how different antenna configurations at the transmitter and receiver effect received power and data throughput. In this paper, we describe field experiments with mmWave antennas for indoor multipath environments and report measurement results on a multitude of antenna configurations. Specifically, we examine four different mmWave systems, operating at two different frequencies (38 and 60 GHz), using a number of different antennas (horn antennas, omnidirectional antennas, and phase arrays). For each system, we systematically collect performance measurements (e.g., received power), and use these to examine the effects of beam misalignment on signal quality, the presence of multipath effects, and susceptibility to blockage. We capture interesting phenomena, including a multipath scenario in which a single receiver antenna can receive two copies of signals transmitted from the same transmitter antenna over multiple paths. From these field experiments, we discuss lessons learned and draw several conclusions, and their applicability to the design of future mmWave networks.