Wei Hong

Southeast University (China), Nan-ching-hsü, Jiangxi Sheng, China

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Publications (360)249.21 Total impact

  • [show abstract] [hide abstract]
    ABSTRACT: A Q-band eight-way power divider in CMOS technology is presented. This divider is designed using lumped elements to realize a compact layout. Parametric analyses for the parasitic effects are given using simplified inductor/capacitor models. Measurement in the 37–49 GHz frequency range shows an insertion loss less than 2.7 dB, the input/output return loss better than $-13.7 ~{rm dB}$ and the port-to-port isolation better than 22.5 dB (more than 30 dB over 44–49 GHz).
    IEEE Microwave and Wireless Components Letters 01/2014; 24(3):173-175. · 1.78 Impact Factor
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    ABSTRACT: An X-band low-phase noise planar oscillator employing the substrate integrated waveguide (SIW) active resonator is demonstrated. By compensating the losses in the SIW cavity with an active feedback loop, the Q-factor of the SIW active resonator is greatly improved. The measured results show a loaded Q-factor of 1569 and unloaded Q-factor of 8782, which is very high among other planar resonators. A simplified generalised phase noise condition and its optimisation approach are proposed for the low-phase noise oscillator design. To validate the proposed optimisation approach, experimental prototypes of oscillators using different design parameters and resonators are fabricated. The measured results show that the optimised SIW active resonator oscillator possesses low-phase noise of -109.2 dBc/Hz at 100 kHz at X-band, which is 17 and 9 dB better than the microstrip resonator oscillator and SIW passive resonator oscillator, and is comparable with the dielectric resonator oscillator measured in this study.
    IET Microwaves Antennas & Propagation 01/2014; 8(3):137-144. · 0.84 Impact Factor
  • F. Zhu, W. Hong, J.-X. Chen, K. Wu
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    ABSTRACT: This letter proposes a new type of microstrip quarter-wavelength stepped-impedance resonator (SIR) filter with controllable mixed electric and magnetic coupling. A conducting pin and an open gap between two coupled SIRs are jointly used to create the mixed coupling, and the electric and magnetic coupling can be separately controlled by adjusting the spacing between the gap and the position of the conducting pin. Based on the proposed structure, a second-order filter and a third-order filter are designed and fabricated. Good agreement between the measured and simulated data is obtained.
    IEEE Microwave and Wireless Components Letters 01/2014; 24(2):90-92. · 1.78 Impact Factor
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    ABSTRACT: This brief presents a broadband, low-local-oscillator (LO)-power, and low-dc-power millimeter-wave (MMW) downconversion mixer with improved linearity using TSMC 90-nm CMOS low-power (LP) process. By employing an active load in the bias network, the linearity of the mixer can be improved effectively. In addition, the conversion gain (CG) of the mixer at high LO power is also improved, whereas the CG at low LO power is not appreciable degraded. The operation principle of the added active load and the impacts on mixer's linearity and CG are analyzed in detail. With a 1.2-V supply voltage and a 0-dBm LO drive power, the proposed mixer with the active load exhibits CG of 0 dB with flatness of $pm$2 dB from 20 to 50 GHz, input ${rm P}_{1,{rm dB}} (hbox{IP}_{1,{rm dB}})$ of $-$1 dBm, and $hbox{IIP}_{3}$ of 9.5 dBm with RF at 43 GHz. The measured $hbox{IIP}_{3}$ is 5.6 dB higher than the conventional approach without the active load, and the dc power consumption of the proposed design is 6 mW, including the IF buffers, which is only 1.8 mW higher than the conventional approach.
    Circuits and Systems II: Express Briefs, IEEE Transactions on 01/2014; 61(3):138-142. · 1.33 Impact Factor
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    ABSTRACT: An approach for the bandwidth enhancement of a polarization rotating frequency selective surface (FSS) based on the substrate integrated waveguide (SIW) technology is proposed in this communication. Compared with the previously reported polarization rotating FSS, the passband bandwidth of the proposed FSS is enhanced from 4.6% to 7.2% by introducing a triple-mode SIW cavity resonator as the periodic element. Meanwhile, better frequency response selectivity of filtering performance is achieved. The proposed FSS is made up of a periodic array of the novel triple-mode SIW cavity resonators with two orthogonal slots on the front and back surfaces for polarization rotation. The triple-mode SIW cavity resonator is achieved by placing a metallic via at the center of a dual-mode SIW cavity resonator. Bandwidth enhancement of the FSS is achieved by simultaneously exciting and properly merging together these three modes in the SIW cavity resonator. A prototype designed at $Ka$-band was fabricated and measured. Good agreement between the measurement and simulation results has been achieved.
    IEEE Transactions on Antennas and Propagation 01/2014; 62(2):940-944. · 2.33 Impact Factor
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    ABSTRACT: A method for fast generating the VIE-MoM matrix with the SWG functions is proposed. This method makes the integrals representing the shared data independent of any quadratures and hence can ensure both the efficiency and accuracy. In the VIE-MoM, the time cost of filling the VIE-MoM matrix is prominent especially for an electrically large object. With the proposed method, the time cost of filling the VIE-MoM matrix can be reduced by about 85% compared with the traditional basis-basis matching method. Numerical examples are provided to demonstrate the efficiency and accuracy of the proposed method.
    International Journal of Antennas and Propagation 09/2013; 2013. · 0.68 Impact Factor
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    ABSTRACT: A TE20-mode substrate integrated waveguide (SIW) fed slot antenna array is proposed at 140 GHz for fabrication ease and cost reduction. The antenna array consists of a feeding network, radiators, and dielectric loadings. The proposed antenna array and an SIW-waveguide transition are integrated into the multilayered low-temperature co-fired ceramic (LTCC). The feeding network comprises a power divider and E-plane couplers that support the TE20 mode. Each pair of symmetrical longitudinal radiating slots is fed by the TE20 mode in a doubled-width SIW. The pair of radiating slots is loaded by a doubled-width open-ended via-fence structure in which a higher order mode is also excited. Experimental results show that an 8 × 8 slot array with the transition achieves a maximum boresight gain of 21.3 dBi at 140.6 GHz and an impedance matching bandwidth of 129.2-146 GHz with a boresight gain above 18.3 dBi.
    IEEE Transactions on Antennas and Propagation 04/2013; 61(4):1784-1793. · 2.33 Impact Factor
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    ABSTRACT: In this paper, a method based on consecutive perturbation for the fast and accurate extraction of all useful surface- and leaky-wave modes for a lossy layered medium is proposed. The algorithm consists of two perturbation stages. In the first stage, according to the relationship for the frequency variation between the surface- and leaky-wave modes, the leaky-wave modes for a lossless medium can be tracked by consecutive frequency perturbation, with the surface-wave modes at a proper high frequency as starting points. All the surface-wave modes are extracted by a modified dichotomy method. In the second stage, a consecutive loss perturbation is performed, in which the medium's loss is increased step by step. In each perturbation step of both of the two stages, Newton-Raphson iterations are employed to update the modes on the corresponding Riemann sheet. With these discrete modes accurately extracted, a combination of the Discrete Complex-Image Method (DCIM) and the All-Modes Method can be realized for accurate evaluation of the Green's functions in the near-field and non-near-field regions, respectively. Several numerical examples demonstrated the high accuracy and efficiency of this method.
    IEEE Antennas and Propagation Magazine 02/2013; 55(1):92-102. · 1.18 Impact Factor
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    ABSTRACT: An empirical formula of the dominant mode resonant frequency of the cavity which is used to back a wide slot antenna is presented. The antenna is formed by etching a wide slot onto the broad wall of a substrate integrated waveguide (SIW) cavity fed by an SIW through an inductive coupling window. The widely slotted cavity resonates at the dominant mode when the wide slot radiates. Based on the analysis of the field distribution in the slotted-cavity, an empirical formula is derived to determine the dominant mode resonant frequency of the cavity with respect to the width to length ratio (WLR) of the etched slot. The empirical formula is numerically verified at a 60-GHz band.
    IEEE Transactions on Antennas and Propagation 02/2013; 61(2):969-972. · 2.33 Impact Factor
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    ABSTRACT: A wide band power amplifier is designed by using 90 nm CMOS process. By proper arrangement of frequency response among circuit stages, the amplifier exhibit maximum gain of 15 dB at 47-48 GHz and 3 dB bandwidth from 42 to 56 GHz. This amplifier could be used in Q-LINKPAN or 802.11aj communication standard.
    Millimeter Waves and THz Technology Workshop (UCMMT), 2013 6th UK, Europe, China; 01/2013
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    ABSTRACT: One of the transformer neutralization conditions derived theoretically in previous publications is to make the coupling factor, k, of the transformer as close to one as possible, which is not easy to realize over millimeter-wave frequency range. To seek a method for neutralizing the transistor gate-drain capacitance to cope with the imperfect reverse isolation with the transformer coupling factor not necessarily being close to one, a voltage-current transformer feedback network is adopted in this paper. A phase noninverting transformer is added between gate and drain nodes of a transistor to form a voltage-current feedback. The neutralization condition of this network is derived. The effect of this network on the gain is predicted theoretically. The noise behavior of this network is also analyzed and compared theoretically with other transformer feedback structures reported in the millimeter-wave amplifier design. A Q-band three-stage amplifier using this network is designed to demonstrate the feasibility of this network. This amplifier is implemented in 90-nm low-power bulk CMOS technology. Measurement results show that this amplifier has the peak gain of 18.3 dB at 46 GHz and the reverse isolation better than 40 dB over the operation frequency range while consuming 20 mW at a supply voltage of 1.2 V, which verifies the unilateralization effect by using this network.
    IEEE Transactions on Microwave Theory and Techniques 01/2013; 61(11):3892-3904. · 2.23 Impact Factor
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    ABSTRACT: In this paper, the research advances in printed microwave and millimeter wave antennas in the State Key Laboratory of Millimeter Waves (SKLMMW) are reviewed, including printed omnidirectional antennas, dual-band antennas, ultra-wideband antennas with or without frequency notches, multi-beam antennas, low sidelobe antennas, filtennas, frequency scanning antennas, reflectarray, and lens etc.
    Antennas and Propagation (EuCAP), 2013 7th European Conference on; 01/2013
  • F. Zhu, W. Hong, J.X. Chen, K. Wu
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    ABSTRACT: A type of substrate integrated waveguide (SIW) `corner cavity` is proposed. For each corner cavity, two transmission zeros (TZs) can be introduced and the location of either TZ can easily be controlled by adjusting suitable geometrical parameters. Using the corner cavities, a novel SIW filter with wide stopband characteristic is implemented. The central frequency of the filter is 20 GHz, and the first spurious appears at about 40 GHz, which is two times the central frequency. In addition, the measured stopband attenuation of the filter is better than 50 dB from 21.24 to 37.71 GHz.
    Electronics Letters 01/2013; 49(1):50-52. · 1.04 Impact Factor
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    ABSTRACT: This paper reports a compact dual-passband filter by using multilayer liquid crystal polymer technology. The investigated filter consists of two resonators on the middle metal layer, which can be independently designed for the two passbands. To achieve a compact size, the resonator for the upper passband is embedded in the resonator for the lower passband. Cross coupling between input and output ports is adopted in the design to improve the selectivity of the reported filter. Experiment is carried on to verify the predicted results and a well agreement is obtained. The proposed filter has a compact size and can be easily designed with flexible dual-passband response. It is attractive for the multiple bands communication system.
    Wireless Symposium (IWS), 2013 IEEE International; 01/2013
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    ABSTRACT: A novel resonator method is presented to extract the attenuation constants of the substrate integrated waveguide (SIW) transmission lines, providing an alternative way to investigate the propagation properties of SIW. The losses of SIW transmission line and cavity resonator have been investigated with theoretical analysis. Then a formula is derived for establishing the relationship between the attenuation constant of the SIW transmission line and the unloaded Q-factor of SIW cavity resonator at its resonant frequency. Thus, the attenuation constant of SIW transmission line can be extracted using SIW cavity resonator. Good agreement between the resonator method and Thru-Line (TL) method has been achieved in both full-wave simulation and experimental results. Besides, good robustness of the resonator method has been demonstrated, suggesting it is a promising technique for investigation of the propagation properties of SIW.
    IEEE Microwave and Wireless Components Letters 01/2013; 23(12):677-679. · 1.78 Impact Factor
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    ABSTRACT: In this talk, the recent research advances in channel characteristic measurement, IC design etc. for the newly proposed millimeter wave high data rate wireless communication standard Q-LINKPAN or IEEE802.11aj (45GHz) are reviewed.
    Microwave Conference Proceedings (APMC), 2013 Asia-Pacific; 01/2013
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    ABSTRACT: A 140-GHz substrate integrated waveguide (SIW) fed slot antenna array using a large and simplified dielectric loading in low-temperature co-fired ceramic (LTCC) is presented. To reduce the fabrication complexity, cost, and tolerance requirements as well as to ease LTCC fabrication limits, the dielectric loading of the array is simplified by using a large via-fenced structure and large slots but maintain acceptable performance. The proposed antenna array with a transition achieves a measured boresight gain of 16.2 dBi at 140 GHz and above 14.1 dBi over the band of 130-152 GHz.
    Antennas and Propagation (EuCAP), 2013 7th European Conference on; 01/2013
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    ABSTRACT: This paper presents an approach of characterization of substrate material using complementary split ring resonator (CSRR). Frequency selective surfaces made from CSRR are excited with free space radiation. The dielectric properties of substrate material can be extracted from resonant frequencies and transmission loss at resonant frequencies. In order to verify the proposed method, the complex permittivity of Silicon substrate is measured from 110GHz to 180GHz by using backward-wave oscillator (BWO) spectrometers. And the measurement results show that the dielectric properties of Silicon substrate remain almost the same as that provided by semiconductor foundry at microwave frequencies.
    Wireless Symposium (IWS), 2013 IEEE International; 01/2013
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    ABSTRACT: A Q-band divide-by-2 injection-locked frequency divider (ILFD) is presented in this paper. A common-centroid cross-coupled transistor pair structure is adopted to reduce the gate-drain capacitance for widening the locking range. The whole layout of the ILFD is simulated using a 3D electromagnetic (EM) simulator for a one-pass success, and a good match between the simulation and measurement results is achieved without using any tuning varactors. At an input power of 0 dBm, the ILFD achieves the input locking range of 34-50 GHz. The power consumption of the ILFD core is 7.7 mW at a 0.7 V supply voltage.
    Wireless Symposium (IWS), 2013 IEEE International; 01/2013
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    ABSTRACT: In this paper, a novel realization of the Integral Equation in combination with the fast Fourier transform for the CFIE is established by Fitting both the Green's function and its Gradient onto the nodes of a uniform Cartesian grid. The new method has been compared with several existing popular FFT-based methods, including the AIM, the IE-FFT, and the p-FFT. The accuracy of the proposed method is significantly higher than other FFT-based methods, and the method is not sensitive to both the grid spacing and the expansion order. The outstanding merit of the proposed method is that the fitting procedure is independent of the basis functions. Therefore, when the higher order basis functions would be adopted in the method of moments, only one fitting procedure for the Green's function and its gradient on a basis function support is needed to meet all of basis functions defined on this support. Some numerical examples are provided in this paper to demonstrate the accuracy and efficiency of the proposed method.
    IEEE Transactions on Antennas and Propagation 01/2013; 61(9):4641-4652. · 2.33 Impact Factor