Di Hua

Hohai University

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Xiaoping Liao

Southeast University

Wen Wu

Nanjing University of Science and Technology

Da‐Gang Fang

Nanjing University of Science and Technology

Junyan Tan

First Teaching Hospital of Tianjin University of Traditional Chinese Medicine

Chunhua Cai

East China University of Science and Technology

Hao Yan

Southeast University

Yong‐Chang Jiao

Xidian University

Ming Qin

Southeast University

Shi‐Shan Qi

Nanjing University of Science and Technology

Jun Zhang

University of Science and Technology of China

Cooperative Institutions

Hohai University

Southeast University

Nanjing University of Science and Technology

Hong Kong University of Science and Technology

Nanjing University

Northwestern Polytechnical University

University of Chinese Academy of Sciences

Shanghai Jiao Tong University

Guangxi University

Ministry of Education of the People's Republic of China

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Packaging research for X-band microwave phase detector based on thermoelectric power sensor

Di Hua Junyan Tan Chunhua Cai

An on-chip X-band microwave phase detector had been reported, whose S-parameters and phase detection measurement are realized on Cascade probe station. The phase detector after packaging is presented in this paper. In order that the device can be embedded in RF systems, SMA connectors are utilized. Two pieces of microstrip line, whose characteristic impedances are 50Ω, are used to connect CPW ports and SMA connectors. S-parameters of the phase detector before and after packaging are measured and compared with the simulated results in HFSS. The measured return losses before and after packaging are less than -16dB and -10dB, and the measured isolation before and after packaging are less than -10dB and -6dB, respectively. The phase detection measurements at 10GHz show that the packaged phase detector is asymmetrical.

HFSS

Return loss

10.1109/iccsn.2017.8230209

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Citations (1)

A GaAs MMIC-based X-band Dual Channel Microwave Phase Detector based on MEMS Microwave Power Sensors

MATEC Web of Conferences (2016)

Di Hua Junyan Tan Chunhua Cai

By sensing the output powers of two channels with MEMS microwave power sensors, a wideband 8-12GHz dual channel microwave phase detector is presented. In order to detect phase difference between reference signal and testing signal in entire 0-360° at X-band, artificial 45° phase lead and 45° phase lag are introduced in two channels, additionally. The proposed phase detector is composed of power dividers, power combiners, 45° (at 10GHz) coplanar waveguide (CPW) transmission delay lines, MEMS capacitive power sensors and thermoelectric power sensors. The two CPW transmission lines result in 45° phase lead and 45° phase lag at 10GHz, and the two different kinds of power sensors are used to detect the combined powers. The fabrication of the phase detector is compatible with GaAs Microwave Monolithic Integrated Circuit (MMIC) technology. The phase detection measurement is accomplished at 10GHz with 0-180° phase shift between testing signals generated by a tunable analog phase shifter. Phase detection results in two channels show that the normalization of the measured results fit the calculated results well, though the results of phase lead have a little of deviation.

Phase shift module

Coplanar waveguide

10.1051/matecconf/20165412001

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The Synthesis of a Magneto-Electric Dipole Linear Array Antenna Using the Element-Level Pattern Diversity (ELPD) Technique

IEEE Antennas and Wireless Propagation Letters (2018)

Di Hua Wen Wu Da‐Gang Fang

The synthesis of a magneto-electric (ME) dipole linear array using an element-level pattern diversity (ELPD) technique is presented in this letter. This linear array with fewer elements, simple structure, and feed network can achieve similar performance of a conventional two-dimensional array because of the application of both the ELPD technique and the ME dipole element. The synthesis of the E-plane radiation pattern is achieved by the superposition of the radiation patterns of different modes with certain weighting, while the H-plane radiation pattern is achieved mainly by array factor with the same weighting. The configuration of the array is given. A three-element ME dipole array with the ELPD technique to obtain equal beamwidths in E- and H-plane is presented as an example to show the design and synthesis procedure. The measured 12.5% impedance bandwidth at a center frequency of 2.4 GHz with |S11|<;-10 dB and stable radiation patterns are achieved. The measured gain is 11.2 dBi at the frequency of 2.4 GHz. The results validate the proposed array and its synthesis procedure.

Collinear antenna array

10.1109/lawp.2018.2832225

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Citations (5)

Resonate frequency research on material characteristics of FBAR temperature sensor

Bensheng Qi Yu Lu Di Hua Chunhua Cai

The paper investigates the resonate frequency characteristics of film bulk acoustic resonator (FBAR) temperature sensor, including resonate frequency, effective electromechanical coupling coefficient (k _eff ² ) and the effect of temperature on resonate frequency. The theoretical calculation formula of resonant frequency related to thickness and temperature is derived and it is verified by means of finite element simulation. The performance of FBAR composed of AlN, ZnO, PZT piezoelectric film and MO, Al, Au electrode is discussed and compared, respectively. The temperature coefficient of frequency (TCF) of FBAR temperature sensor composed of AlN and ZnO is obtained, respectively. The TCF of FBAR composed of AlN piezoelectric film is -19.380ppm, and the TCF of FBAR composed of ZnO piezoelectric film is -62.756ppm.

Temperature coefficient

Electromechanical coupling coefficient

10.1109/iccsn.2017.8230132

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Citations (5)

MEMS frequency detector at X-band based on MMIC technology

TRANSDUCERS 2007 - 2007 International Solid-State Sensors, Actuators and Microsystems Conference (2009)

Di Hua Xiaoping Liao Jun Zhang Yong‐Chang Jiao

A frequency detector at X-band based on MEMS technology is presented, which is based on detecting the phase shift between the two different CPW transmission lines. The phase shift, which is proportional to the frequency of the signal, results in the variation of the output power. The variation is detected with two kinds of the microwave power sensors, one is the capacitive power sensor and the other is the thermopile one. Therefore, the detector can offer a wide detectable frequency range. This frequency detector is designed and fabricated using GaAs MMIC technology. It is measured at X-band with 10 dBm and 17 dBm. The sensitivity is 0.56 GHz/pF under 17 dBm by the capacitive power sensor, and 6.67 GHz/mV under 10 dBm by the thermopile, respectively.

Thermopile

X band

SIGNAL (programming language)

10.1109/sensor.2009.5285835

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Citations (6)

Non-initial overlap bulk silicon comb-drive actuator with low-voltage and large-displacement

MATEC Web of Conferences (2016)

Chunhua Cai Di Hua Ming Qin

Two different kinds of bulk-Si comb-drive actuators are designed in this work: initial overlap comb-drive actuator and non-initial overlap comb-drive actuator. They are fabricated by a simple post-CMOS bulk micromachining process. A cascade folded beam is designed to achieve large displacement at low driving voltages. And non-initial overlap and unequal wide comb fingers are used to reduce the side instability and improve the pull-in voltage. The measurement results show that the non-initial overlap comb-drive actuator improves the pull-in voltage by 73.3% than the initial overlap comb-drive actuator, and the maximum displacement of the non-initial overlap actuator is larger by 78.9% than that of the initial overlap actuator.

Comb drive

10.1051/matecconf/20165412003

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The phase sensitivity and response time of an X-band dual channel microwave phase detector

IEEE Sensors (2015)

Hao Yan Xiaoping Liao Di Hua

An X-band dual channel microwave phase detector is measured at 10GHz with -180° to +180° phase difference in this paper. Moreover, the phase sensitivity and response time of this phase detector are investigated. This phase detector is fabricated based on GaAs MMIC (monolithic microwave integrated circuit) technique. Experiment results indicate that the measured results of phase detection are in good agreement with the calculated results. The phase sensitivity can reach to 14μV/°@10GHz and the response time is about 356μs.

Phase detector characteristic

Phase response

10.1109/icsens.2015.7370328

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Citations (1)

A micro compact coplanar power divider at X-band with finite-width ground plane based on GaAs MMIC technology

Microsystem Technologies (2013)

Di Hua Xiaoping Liao He-chao Liu

Wilkinson power divider

Ground plane

Coplanar waveguide

Reflection coefficient

Reflection

Stripline

10.1007/s00542-013-1775-2

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Citations (8)

The synthesis of array antennas using the element-level pattern diversity (ELPD) technique

2022 16th European Conference on Antennas and Propagation (EuCAP) (2017)

Di Hua Wen Wu Da‐Gang Fang

From the viewpoint of diversity, this paper presents the applications of element-level pattern diversity (ELPD) technique in the synthesis of array antennas. The application examples include the linear array antennas, the concentric loop array antenna, conformal array antenna and the time-modulated array antenna. With one more degree of freedom in the synthesis, this technique exhibits many advantages. The limitations of this technique are also discussed. In addition to the simulations, the verification of this technique is given through a practical linear array antenna where the full wave analysis has been involved in the design.

Collinear antenna array

Conformal antenna

Reflective array antenna

Array gain

Antenna diversity

10.23919/eucap.2017.7928178

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Citations (2)

Study of a Capacitive Clamped Beam RF MEMS Power Sensor Based on MEMS Technology

Key engineering materials (2011)

Zheng Zhu Xiao Ping Liao Di Hua

This paper proposes a sophisticated type of capacitive clamped beam RF MEMS power sensor, which is fabricated on GaAs substrate with MMIC technology. This new capacitive clamped beam RF MEMS power sensor can act quickly to the RF signals and consumes little power on central CPW line. A version of draft microwave circuit model is presented, in order to build a set of initial structure parameters of the clamped beam RF MEMS power sensor simulation model. The frequency scope of this designed clamped beam RF MEMS power sensor is from 8GHz to 12GHz. Through adjusting the set of initial structure parameters of simulation model, a set of successful and proper S parameter of HFSS simulation can be obtained, and the S parameter is: S11 is less than -35dB and S21 is less than 0.15dB. Based on the performance parameter mentioned, the optimization on the power sensor simulation structure has been presented.

HFSS

10.4028/www.scientific.net/kem.483.503

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