Jun-Fa Mao's research while affiliated with Shanghai Jiao Tong University and other places
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Publications (372)
This study presents the design of a self-packaged substrate integrated waveguide (SIW)-based slot antenna with a low profile at the W-band. A
$1\times $
4 SIW slot antenna array is developed using a standard printed circuit board (PCB) process. Then, the array is embedded in a silicon wafer. The loss of the benzocyclobutene (BCB)-based coplanar w...
High-speed link consisting of drivers and interconnects is essential for high-speed data transmission. In this article, a surrogate modeling technique based on graph neural network (GNN) and recurrent neural network (RNN) is proposed for signal integrity (SI) analysis of high-speed links with variable physical parameters and variable topologies. Fi...
This article aims to study the thermal effect, inverse piezoelectric effect, and trap effect of aluminum gallium nitride (AlGaN)/gallium nitride (GaN) high-electron mobility transistors (HEMTs) with injection of narrowband (NB) microwave pulses where sensitive semiconductor devices are often disturbed or even damaged by intentionally electromagneti...
In this letter, a miniature wideband active magnetic probe with high spatial resolution and high sensitivity is designed for near-field signal measurement. The wideband amplifier and the horizontal transition structure, which is stripline (SL) to spoof surface plasmon polariton (SSPP) transition, are applied for the wide bandwidth. The loop area is...
In this study, a broadband tunable reflective graphene-based linear polarization converter (GLPC) is proposed based on the graphene-ionic liquid-ITO structure (GIIS) integrated with a periodic double split ring resonator (DSRR) in the millimeter-wave regime. The tuning characteristic of the designed GLPC is analyzed using full-wave simulations and...
In this paper, a compact rejection filter is proposed based on 2.5-D spoof surface plasmon polariton (SSPP) structure and folded spilt-ring resonators (SRRs). By embedding the folded SRRs into periodic grooves of the 2.5-D SSPP transmission line, a rejection band is created in the ultra-wide passband, resulting in pass-rejection-pass frequency char...
In rapid single-flux quantum circuits, the signal integrity problem of superconducting passive transmission lines (PTLs) becomes critical. In this article, an extended 3-D finite-difference time-domain (FDTD) method is proposed for coanalysis of superconducting PTLs and Josephson junction (JJ) drivers and receivers. The central difference FDTD sche...
The design of a W-band BCB-air cavity-backed antennas is presented in this letter. The three-dimensional (3-D) capacitance model of the cavity-backed structure is analyzed and the design methodology is illustrated in detail. The proposed antenna is fabricated by using our in-house silicon-based MEMS photosensitive composite film fabrication process...
In this article, quarter-mode substrate-integrated waveguide (QMSIW) filters featuring ultrawide stopband and flexibly allocated transmission zeros (TZs) are proposed. Eight higher modes with resonant frequencies up to 4.7 times of the fundamental mode are highly suppressed. It is realized by the combination of three approaches without extra circui...
In this letter, a two-material-filled ridge half-mode substrate integrated waveguide (2M-RHMSIW) is proposed for monomode bandwidth (MMB) enhancement. The cutoff frequency of the dominant mode decreases with the permittivity of the material filling in the bottom layer increasing. The cutoff frequency of the second mode increases as the permittivity...
This letter proposes a near-field motion detection technique based on a resonant magnetic-field probe. The resonant magnetic-field probe consists of a parallel metal plate and a quarter-wave impedance transformer to make the input impedance 50 Ω. The 5.8-GHz radio frequency (RF) front-end is designed, which consists of a hybrid coupler and the prop...
In this brief, a low-loss self-packaged Ka-band LTCC filter is proposed based on an artificial multi-mode substrate integrated waveguide (SIW) resonator. Two ridges and two metal strips are tightly integrated in one SIW cavity to form the artificial quad-mode resonator. Due to the shielding of the SIW cavity, the resonator realizes a high Q factor,...
In this article, a Ka-band dual-component electric probe is proposed in low temperature co-fired ceramic for near-field scanning, which consists of a sensing part of two symmetric L-shaped strips and a 0
$^{\circ}$
/180
$^{\circ}$
hybrid coupler. The responses to the tangential and normal electric components are outputted to the difference and su...
This article demonstrates the protection effects using transient voltage suppressor (TVS) diodes based circuits under high-power microwave (HPM) pulses. Two types of TVS diodes were studied, and their dynamic resistances versus the input power were obtained. Five types of topologies using these two TVS diodes based circuits were designed and compar...
A new on-chip unequal Wilkinson power divider (WPD), developed on a silicon-based integrated passive device (IPD) process and parametric model, is proposed. The central operating frequency is at 4.8 GHz for sub-6G applications. The design process achieves a balance between circuit simulation efficiency and full-wave simulation accuracy based on the...
Three RF switches and a phase shifter are proposed using the conductive bridging random access memory (CBRAM) technique. The fabrication process is developed with the Nafion membrane on a high-resistivity silicon substrate. The equivalent circuit model is established for each memristive RF switch. The proposed switches and the phase shifter have be...
In this paper, a millimeter-wave bidirectional active integrated coplanar waveguide slot antenna with ball grid array (BGA) interconnection is proposed. Symmetric multistage step impedance resonator matching network and tapered shaped structures are utilized to ultra-wideband compensate the reactance behavior of the vertical BGA transition, which c...
Millimeter-wave radar interferometry is superior in detecting small displacement motions owing to its short wavelength. However, it is subject to phase ambiguity as the target displacement may often exceed a quarter wavelength. In this article, a modified differentiate and cross-multiply (MDACM) technique is proposed to tackle the phase ambiguity i...
This study presents a design of a 94-GHz high-performance and highly compact frequency-modulated continuous-wave radar sensor. In this sensor, an
$X$
-band CMOS-based all-digital phase-locked loop chip,
$W$
-band SiGe-based transceiver monolithic microwave integrated circuit (MMIC), and
$W$
-band GaN-based MMIC power amplifier (PA) are hetero...
A predistorted folded substrate integrated waveguide (FSIW) filter is developed for a flat passband. The unloaded
${Q}$
-factor of FSIW cavity is predicted numerically and then applied to the coupling matrix synthesis. A filter prototype is fabricated with the low temperature cofired ceramic technology (LTCC), where the direct and cross couplings...
In this article, a slow wave (SW) ridged half-mode substrate integrated waveguide (RHMSIW) combined with spoof surface plasmon polaritons (SSPPs) structure is proposed. The SW feature is achieved by integrating the SSPP structure into the metal ridge of RHMSIW. Besides, the proposed structure has a compact lateral size because the ridge of the RHMS...
In this letter, novel miniaturized bandpass filters with wide stopband performance are proposed on the basis of the half-mode T-septum substrate integrated waveguide (HMTSSIW) resonator. The resonant TE
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and TE
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In recent years, there has been great interest in millimeter-wave (mmwave) and terahertz (THz) technologies due to an increasing demand for ultrahigh data transfer rate. Two novel solutions, i.e., antenna on chip (AoC) and antenna in package (AiP), have been proposed for the development of highly integrated radio and radar systems [1]-[5]. To measu...
Magnetic‐field probes can be used for electromagnetic interference measurement of high‐speed circuits. The main magnetic probe performance includes sensitivity, spatial resolution, electric‐field suppression ratio (EFSR), and measurement accuracy. In this article, a pair of differential magnetic‐field probes is proposed to improve measurement accur...
In this article, an ultrawideband magnetic probe with high electric field suppression ratio (EFSR) is proposed. The probe has three parts: the loop part, the transmission part, and the head part. Shield metal sheets are designed in the loop part to enhance EFSR. The tapered transmission line in the transmission part and the quasi coaxial transition...
An equivalent method has been presented to analyze an
$N$
-port network composed of transmission lines or coupled lines. Based on this method, a three-port coupled line with one-port short-circuited can be seemed equal to another three-port network without port coupling at the central frequency. A new Gysel out-of-phase power divider with output...
A new power divider is proposed with a compact size. In 50-Ω systems, impedance transformation is of great importance for power dividers. Coupled microstrip lines with capacitor loaded and two short-circuited ports are introduced to properly transform impedance and increase degrees of freedom in power divider designs. Image impedance and image tran...
In this article, a half-mode substrate integrated waveguide (HMSIW) combined with 2.5-D spoof surface plasmon polaritons (SPPs) structure is proposed to tailor the dispersion features and cutoff frequency of the HMSIW. The proposed HMSIW-SPP structure has a smaller longitudinal dimension since the dispersion of the proposed structure can be tailore...
This paper presents the analysis on a millimeter-wave 77 GHz multiple-input multiple-output (MIMO) radar with virtual antenna array for touchless gesture sensing for human-computer interaction (HCI). The virtual array allows fewer receiving channels to achieve higher spatial resolution, which facilitates the integration of radar technology into com...
Orbital angular momentum (OAM) modes of electromagnetic (EM) waves have been extensively studied to obtain more than two independent channels at a single frequency. Thus far, however, multiple radiators have been used to achieve this goal in wireless communications. For the first time, a single radiator was designed to simultaneously transmit three...
In this paper, a novel automatically designed electromagnetic bandgap (EBG) structure is presented to prohibit the simultaneous switching noise (SSN) propagation of system in package. The tool of automatic EBG design is the improved genetic algorithm (GA), which has the advantages of rapid convergence and high precision by combining several improve...
In this letter, a compact self-packaged folded substrate-integrated waveguide filter with loaded stubs is presented. Transmission zeros (TZs) at the same number of filter order are designed to improve out-of-band performance. The position of each TZ is controlled independently. The first spurious resonance increases by up to 3.8 times the fundament...
The four‐port cavity model is presented to study a differential dual‐polarised annular‐ring patch antenna operating at higher order mode TM12. Acceptable agreements among calculated, simulated, and measured impedances and radiation patterns are obtained. Theoretical analysis shows that the differential port‐to‐port coupling impedance is zero, and i...
A novel quintuple-mode filter in one cavity is proposed by modifying a quarter-mode substrate-integrated waveguide cavity. Modes can be independently controlled by dimension parameters of the resonator. The quintuple-mode resonator is packaged to prevent electromagnetic leakage, and pillars are added to remove spurious cavity resonances introduced...
Citations
... Additionally, a noncontact drunk driving monitoring technique was proposed using ECG and radar-based Doppler Cardiogram (DCG) signal data. The experimental result shows that the proposed approach provided accurate readings of HRV variation before and after alcohol intoxication [80]. ...
... Therefore, it does not provide information about abnormalities in the heart's anatomy. A few reports have shown non-contact measurement of seismocardiography (SCG) using a radar [12,13]. SCG is the chest wall vibration caused by the heartbeat and can indicate abnormalities in the heart. ...
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