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In this paper, a wideband vertical microstrip-to-microstrip transition designed with cross-coupled microstrip and slotline resonators is proposed. By utilizing two identical microstrip lines on top and bottom layers perpendicularly coupled with a uniform slotline resonator on the ground plane, a wideband filtering performance with three transmission poles can be obtained. To confirm the predicted...
Effective wave impedances of substrate integrated waveguide (SIW) with square vias and circular vias are numerically de-embedded from three-dimensional (3-D) full-wave algorithm by virtue of a short-open-load (SOL) calibration approach. Full-wave simulation is at first conducted to model a finite-cell SIW with two feeding uniform waveguides. Afterwards, three calibration standards are established...
A compact microwave bandpass filter with λ/4 stepped impedance resonators (SIRs) is presented in this paper. λ/4 SIRs are employed here not only to miniaturize the circuit size, but also to eliminate spurious resonance at 2f0. To achieve the maximal number of finite transmission zeros, this filter is synthesized based on the 4th-order fully canonical coupling topology. As a result, four finite transmission...
When used in counter-terrorism and disaster rescue, UAVs may possibly fly in buildings. In an indoor closed environment, GPS signal may be blocked, which will make UAVs difficult to obtain their location. In addition, a complex indoor environment also brings challenges to the safety of flight. Therefore, it is necessary to identify complex environments and avoid obstacles in real-time. This paper...
Currently, there are increasing demands for unmanned aerial vehicle (UAV) in urban application. UAV based on mobile communication network has further breached the limit of transmission distances. Taking into account the inherent characteristics of communication network infrastructures such as blind spots in distribution and space loss, this paper uses the wireless communication model of base station...
A novel class of miniaturized multi-mode wideband bandpass filters (BPFs) is introduced this paper, includes four multiple-mode filters. Two of them are realized using metal cavity and two of them are realized using substrate integrated waveguide (SIW). These filters have significant advantages in size reduction which can reduce 2.5-4 times compared with traditional single-mode cavity filter. The...
With the development of wireless communication technology, Internet users have higher requirements for QoS (Quality of Service) in wireless networks. The choice of feasible routing paths is inevitable in order to meet demand for services. As we know, in wireless environment the network status usually changes frequently and rapidly. In this thesis, we propose a QoS routing algorithm based on Vague...
This paper presents the fundamental concept and formulation of short-open calibration (SOC) technique in 2.5D method of moments (MoM), and its application in commercial software. By de-embedding the port discontinuities and feeding network, the guided-wave characteristics of periodic planar transmission line structures, such as microstrip line, coplanar-waveguide electromagnetic band-gap, and metamaterial...
A dual-band bandpass filter using a transversal-interference multimode resonator is proposed. The resonator is composed of a flatten ring resonator attached with two open-circuited stubs. By properly selecting the connecting position between the stubs and a ring, the two pairs of resonant modes can be grouped to make up the dual-passband response, and they can be further separated with virtue of two...
In this paper, we propose a simple cascading failures model based on the node efficiency in complex networks. The model shows how a small initial shock, such as the removal of a single node, can trigger avalanches mechanisms and even collapse a system. We propose the network efficiency E(G) to evaluate the influence degree of the cascading failures. Simulation results show that both the node capacity...
The depth image has greatly broadened various applications of computer vision, however, it is seldom explored in the field of salient object detection. In this paper, we propose a learning-based approach for extracting saliency from RGB-D images. For best fitting the contrast-based stimulus that guides the saliency search in human vision system, massive visual attributes that are extracted from several...
Voltage drop introduced by long cable cannot be neglected any more in high-power remote-loading applications, e.g., power adaptor for the charger of modern smart phones or tablets. In this paper, self-adaptive wire drop compensation (WDC) schemes for DC-DC regulator have been proposed and discussed. A 3.5-A buck DC-DC regulator with the proposed WDC circuit has been implemented in 0.6μm CMOS technology...
A wideband vertical microstrip-to-microstrip transition has been proposed in this paper. Two dual-mode slotline resonators are placed on the common ground between the top- and bottom-layer to construct a novel wideband transition. The first two resonant modes in the slotline resonators are excited and utilized by coupling or feeding them at specific positions. After resonators themselves and their...
With the rapid development of UAV technology, remote measurement and control technology is vital to UAV, especially to the civil field. This paper builds an onboard embedded computing platform, establishes a measurement and control link based on mobile communication networks, puts forward an UAV position compensation method based on network time delay prediction, and finally realizes the remote measurement...
In multiple-input multiple-output cognitive interference channels, secondary users share frequency bands with primary users. The different frequency authorities of the secondary users and the primary users complicate the determination of the upper bound (UB) of the degrees of freedom (DoF). This study focuses on the (K+1)-user interference channel from the perspective of the solvability of multivariable...
Optical modulation characterisitics of graphene-hybridized plasmonic metamaterials is investigated. It is revealed that resonance peak transmission can be effectively tuned by the applied gate voltage, suggesting an electro-absorption modulation (EAM) mechanism.
A novel planar circularly-polarized antenna using the stepped-width cross-dipole is presented in this paper. Firstly, the input impedance of a single stepped-width dipole is studied under different length and width ratios of two distinctive dipole sections. Then, two stepped-width dipoles with dissimilar dimensions are individually designed and orthogonally oriented in a crossed format, thus producing...
In this letter, a numerical short-open-calibration (SOC) technique is developed to be integrated with the electromagnetic (EM) software for direct de-embedding of propagation constant of substrate integrated waveguide (SIW). The two calibration standards, i.e., short- and open-end circuits can be perfectly built up by means of perfectly electric and magnetic walls in numerical algorithm. After three...
A novel wideband bandpass filter using back-to-back microstrip-slotline transition and triple-mode slotline resonator is proposed. The triple-mode resonator is constructed with one full-wavelength slotline ring and a single short-circuited stub. Two microstrip feed lines are placed above the slotline in such a way that two intersection positions are placed at the 54° separation along the ring. With...
In this letter, a numerical short-open-calibration (SOC) technique is developed to be directly integrated with the commercial electromagnetic software for accurate extraction of propagation constant of substrate integrated waveguide (SIW) with longitudinally periodic metallic posts. Short- and open-end circuits can be exactly realized by means of electric and magnetic wall in software respectively...
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