With the development of consumer electronics technologies, many more powerful devices such as cell phone, PDA and laptop have brought consumers an unprecedented level convenience flexibility. However, how to protect personal private information stored in from misuses owing theft or loss is becoming a major issue. To solve problem, secure reliable user identification mechanisms using biometrics technology should be equipped into devices. This paper presents system framework finger-vein for...

A novel compact low-profile frequency selective surface (FSS) with controllable triband characteristics is presented. The proposed FSS consists of a stacked periodic array square loops and complementary apertures, respectively centered within wire grid an aperture grid, which can create three transmission poles two zeros. Controllable performance achieved, allowing the to transmit signal at 4 GHz while reflecting signals 6 9.5 GHz. Due structure, designed has reduced sensitivity incident...

This paper presents a cross-coupled bandpass filter with stacked substrate-integrated waveguide cavities on low-temperature cofired ceramic substrates. The proposed has local multipoint distribution service band novel same-side-feed input/output structure. Conventionally, structure generates only single pair of transmission zeros. can generate two pairs zeros beside the passband, thereby providing an excellent cutoff rate in stopband and improved frequency selectivity. additional is created...

Abstract Rechargeable aqueous zinc batteries are promising for large‐scale energy storage due to their low cost and high safety; however, density has reached the ceiling based on conventional cathodes with a single cationic redox reaction mechanism. Herein, highly reversible cathode of typical layered vanadium oxide is reported, which operates both couple V 5+ /V 3+ accompanied by Zn 2+ anionic O – /O 2– anion hosting in an deep eutectic solvent electrolyte. The oxygen delivers additional...

A novel combined‐element frequency selective surface (FSS) is proposed for multi‐band applications. In this design, complementary square loops and meandering slots are combined to construct the composite FSS. The FSS provides three transmission poles two zeros, transmitting desired signals at 8.5, 11 16 GHz while reflecting unnecessary 9.6 13.1 GHz. This has advantages of flexible simple structure, easy processing low profile compared with traditional multi‐pole FSSs. design strategy...

Inspired by the well-known power/energy leakage phenomenon between an unshielded grounded coplanar waveguide (GCPW) and its neighboring parallel-plate (PPW), a class of simple, low-cost, planar leaky-wave antennas (LWAs) exhibiting wideband fixed-beam radiation tailorable directional angle are systematically investigated developed for millimeter-wave applications. The capability providing (desired) inflexibility altering beam's (undesired) first studied revealed concerning uniform GCPW LWA....

Mode-selective transmission line (MSTL) has been studied and realized in support of ultrabroadband ultrafast electromagnetic signal guidance. Its operation is based on the fact that its dominant mode behaves as a quasi-TEM microstrip at low frequencies gradually converted into quasi-TE10 waveguide higher notwithstanding longitudinal uniformity. In first part this work (Part I), physical mechanism frequency-dependent modal behavior presented. From viewpoint coupling, MSTL heuristically...

In Part I of this two-part work, we have presented the theoretical foundation and physical mechanism mode-selective transmission line (MSTL). This part is devoted to its excitation scheme, practical transition design, experimental verification. The MSTL first explained by comparison with a conductor-backed coplanar waveguide (CBCPW). To produce specific mode excitation, an ultrabroadband between CBCPW proposed. It has tapered structure operating as tapered-mode coupler, which supports smooth...

In this paper, a novel miniaturized dual-band loaded frequency selective surface (FSS) with narrow band spacing is presented, in which each periodic cell consists of metallic patches connected lumped inductors and capacitively square loop aperture resonator printed on either side dielectric substrate. This structure provides two closely separated passbands distinct null, an equivalent circuit model given for analyzing its filter mechanism. The simulated transmission coefficients by CST...

This work investigates mode conversion along a longitudinally uniform mode-selective transmission line (MSTL) and demonstrates physical evidence of the conversion. Mode fundamental is observed through examining field distributions MSTL. Characteristic frequency defined based on distribution properties longitudinal magnetic component intrinsic implications. The accuracy effectiveness this definition are verified numerically experimentally. result indicates that quasi-TEM quasi-TE10 dominate...

A class of longitudinally uniform transmission lines with low loss, dispersion, and high-field confinement, called mode-selective (MSTLs), has been proposed for ultra-broadband ultra-fast electromagnetic signal guidance processing. Their operation is mainly based on the concept frequency-enabled mode selectivity. This paper presents our latest research results this emerging MSTL, including its operating mechanism, propagation characteristics, higher-order modes, transition design. Throughout...

This study presents a 60 GHz quasi‐elliptic bandpass filter with compact and planar structure. The proposed was constructed by stacking substrate integrated waveguide (SIW) cavities on the central transverse plane of shielding SIW cavity. Jerusalem cross (JC) apertures circular were etched metal layers stacked to enable dual‐mode operation energy coupling. In cavities, TM 110 cavity mode JC aperture can be excited simultaneously. Cross‐mutual couplings exist among resonant modes, resulting...

Recently, Khan et al. proposed an efficient and practical chaotic hash-based fingerprint biometric remote user authentication scheme on mobile devices. Unfortunately, Yoon-Yoo demonstrated that al.'s was vulnerable to a privileged insider attack impersonation by using lost or stolen To isolate such problems, improvement scheme. However, the two schemes required synchronized clocks between system server because of timestamps in process. Actually, it is fairly complicated achieve time...

Digital Rights Management (DRM) system is the effective schemes for digital transactions. A novel authentication scheme of DRM based on multimodal biometric verification and watermarking technique described in this paper, which highly secure iris recognition face their feature fusion described, can achieve rights management content exactly through illegal user access control. In algorithm, image chosen to be host image. Iris selected use as watermark hidden Such that not only protects data,...

BaTiO3 crystal thin film has been investigated to realize electro-optic (EO) devices due its ultrahigh EO effect, but not much research focused on the correct axis orientation and coefficient. In this Letter, with a grown by pulse laser deposition technique ⟨100⟩ MgO substrate, an embedded device configuration having two-step etched waveguide/electrode scheme is designed reach high optic-electrical field interaction efficiency, 45° outside electric in-plane set fit possibility of a-axis or...

Digital rights management (DRM) system is the effective schemes for digital transactions. A novel authentication scheme of DRM remote users based on multimodal biometrics (such as iris and face feature) verification watermarking smart cards described in this paper, which include two phases, i.e. client server authentication. For authentication, we integrate technique biometric highly secure recognition to provide more reliable personal recognition. In algorithm, image chosen be host image,...

Propagation characteristics of mode-selective transmission line (MSTL) are systematically investigated in this work. Thanks to the frequency-enabled mode selectivity, different mechanisms used determine phase and attenuation MSTL over frequency ranges. With fullwave simulations, a direct correlation between constants related individual modes interest is conducted, illustrating well-behaved variable MSTL. For MSTL, conductor dielectric losses separately examined compared those microstrip...

A novel topology for designing 60 GHz duplexers is presented. Both the receiver (Rx) and transmitter (Tx) filters of duplexer, which were constructed using dual‐mode substrate‐integrated waveguide (SIW) cavities, can exhibit a single‐sided transmission zero. The zeros arranged to achieve high channel isolation frequency selectivity. results confirm that fabricated duplexer an Rx/Tx higher than 30 dB.

Ultrashort pulse transmission has been recognized as a primary problem that fundamentally hinders the development of ultrafast electronics beyond current nanosecond timescale. This requires line or waveguide exhibits an all-pass frequency behavior for transmitted ultrashort signals. However, this type waveguiding structure not yet practically developed; groundbreaking innovations and advances in signal technology are urgently required to address scenario. Herein, we present synthesized...

Based on a proposed approach, novel low-profile tri-band frequency selective surface (FSS) is presented. The FSS consists of two-dimensional periodic array metallic square loops and complementary apertures arranged periodically, centered within wire grid an aperture respectively. A very thin substrate, with the overall thickness 0.007 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> , 0.013...

Lightning strike is one of the main factors affecting power transmission lines and may lead to broken strands damage lines, resulting in abnormal supply. To improve accuracy lightning location, this paper presents a polarization optical time-domain reflectometer (POTDR) location method based on orthogonal coding technology. The point can be located by detecting state (SOP) mutation Rayleigh backscattering POTDR system. technology used distance location. Through calculation simulation...

Abstract By analyzing the changes in three Stokes vectors, trajectory of polarization state on Poincaré sphere, and change rate, both theoretical practical aspects variations signal light within optical fiber composite overhead power ground wires (OPGWs) during real thunderstorm conditions, were examined. Our findings reveal that lightning mechanical vibrations impact OPGW. Theoretical models demonstrate induces through Faraday magneto-optic effect exhibits nonlinear electro-optic effects,...

The dynamics of a discrete-time background network with uniform firing rate and input is investigated. conditions for stability are firstly derived. An invariant set then obtained so that the nondivergence can be guaranteed. In set, it proved all trajectories starting from any nonnegative value will converge to fixed point under some conditions. addition, bifurcation chaos discussed. It shown engender increase input. computations Lyapunov exponents confirm chaotic behaviors.

A composite cavity-based antenna is proposed and presented in this work. Three kinds of modes the structure are involved to obtain a wide bandwidth: TE11= cavity mode cylindrical open-ended substrate integrated waveguide cavity, odd TEM generated by loading two rectangular via holes inside higher-order loop (L3 L5) circular ring detached from circumferential slot located at cavity’s side wall. In implementation antenna, coupling feeding methodology applied, which also introduces resonance...

Remote user authentication scheme is a mechanism which allows server to authenticate remote over insecure channel. Recently, Goriparthi et al. made an enhancement based on Das al.'s using bilinear pairings. The has the merits of no verification table, freely changing password and preventing forgery attack replay attack. This paper, however, demonstrates that improved vulnerable insider attack, denial-of-service spooling