In this paper, a horizontally meandered strip (HMS) feed technique is proposed to achieve good impedance matching and symmetrical broadside radiation patterns for single-fed broadband circularly polarized stacked patch antenna, which suitable universal ultrahigh frequency (UHF) RF identification (RFID) applications. The antenna composed of two corner truncated patches an HMS, all are printed on the upper side FR4 substrates. One end HMS connected main by probe, while other SMA connector....

A novel proximity-coupled probe-fed stacked patch antenna is proposed for Global Navigation Satellite Systems (GNSS) applications. The has been designed to operate the satellite navigation frequencies in L-band including GPS, GLONASS, Galileo, and Compass (1164-1239 MHz 1559-1610 MHz). key feature of our design probe feeds increase impedance bandwidth integrated 90deg broadband balun improve polarization purity. final exhibits broad pattern coverage, high gain at low angles (more than -5...

A novel broadband circularly polarized (CP) slot antenna array fed by asymmetric coplanar waveguide (CPW) with an inverted L-shaped strip for L-band applications is proposed. Broadband CP obtained composed of elliptically elements using sequential rotation feed technique. Experimental results show that the VSWR les 1.5 impedance bandwidth and 3-dB axial ratio can be greatly raised to as high 52% (1.151.95 GHz) 49% (1.151.9 GHz), respectively. The proposed provide a peak gain about 8 dBi at...

A novel capacitive-coupled probe-fed circularly polarized (CP) microstrip antenna with coplanar parasitic ring slot patch has been proposed for the International Maritime Satellite (INMARSAT) and Global Positioning System (GPS) applications. The key feature of design is employing four-probe feeds to increase impedance bandwidth adopting enhance CP bandwidth. feed network compact neat using only T-junction power dividers phase shifters shunted short-circuited stubs lightning protection....

Mobile edge computing (MEC) can augment the computation capabilities of mobile terminals (MTs) through offloading computational tasks from MTs to MEC-enabled base station (MEC-BS) covering them. However, load MEC-BS will rise as increase scale tasks. Existing schemes try alleviate refusing, postponing, or queuing requests MTs; thus, users' QoS largely deteriorate due service interruption and prolonged waiting execution time. In this paper, we investigate cooperations multiple MEC-BSs propose...

A novel self-matched negative group delay (NGD) microwave circuit based on the signal interference technique is proposed to eliminate performance degradation due temperature-dependent resistance variation. The consists of unequal power dividing/combining structures and coupled-line phase shifter, which can be directly synthesized with prescribed NGD time insertion loss (IL). To verify method, an a size 0.41λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

An artificial neural network-based synthesis model is proposed for the design of single-feed circularly-polarized square microstrip antenna (CPSMA) with truncated corners. To obtain training data sets, resonant frequency and <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> -factor antennas are calculated by empirical formulae. Then size corners operation best axial ratio obtained. Using Levenberg-Marquardt (LM) algorithm, a three hidden...

A compact self-matched negative group delay (NGD) circuit without the need for an external matching is proposed. The proposed NGD composed of two-port open-circuited coupled lines, a short-circuited transmission line and two resistors connected by lines. lines are utilized to obtain port matching. To verify design concept, with size 0.39λg × 0.19λg designed fabricated. From measurement results, value -8.75 ns at center frequency 1.570 GHz obtained bandwidth 3.82%, signal attenuation less...

AbstractIn this paper, we introduce three new inertial-like Bregman projection methods with a nonmonotone adaptive step-size for solving quasi-monotone variational inequalities in real Hilbert spaces. Under some suitable conditions, the weak convergence of these is proved without prior knowledge Lipschitz constant operator and strong proposed under quasi-monotonicity assumption mapping also provided. Finally, several numerical experiments applications image restoration problems are provided...

A single-feed dual-band dual-sense circularly polarized (CP) stacked patch antenna with a small frequency ratio is proposed for Chinese 842.5/922.5-MHz radio identification (RFID) reader applications. Two elliptical-ring patches are configured orthogonally to operate at different bands senses of circular polarization. π-type complex impedance transformer modified asymmetric open-ended stubs easily tune the input matching both bands. Measured bandwidth 2.99% (824-849 MHz) lower band and 2.72%...

A full-passband linear-phase band-pass filter (BPF) equalized with negative group delay circuits (NGDC) is proposed. The NGDCs are utilized to suppress the salient at edge of passband traditional BPF for achieving characteristic. To obtain input- and output-port impedance matching, two BPFs loading center symmetrically configured by Wilkinson power dividers. verify design concept, a 3-order designed fabricated. From measured results, GD fluctuation reduced 74% from 0.57 0.15 ns, return loss...

Biomaterial utilization in a highly value-added way is key factor promoting sustainable development of the human society. Herein, plant polyphenol (PPL), extracted from larch pine bark, has been exploited to synthesize ZnO@PPL. Its microstructures and morphology were examined by experimental techniques conjunction with density functional theory calculations. Small pinecone-like particles ZnO@PPL are accessible. As coating layer, PPLs play two roles: (1) chemically couple ZnO control its size...

Abstract This paper presents a balanced switchable bandpass filter (SBPF) with differential‐mode (DM) reflectionless characteristics in the on‐state. The proposed SBPF consists primarily of dual‐mode resonators loaded p‐type–intrinsic–n‐type diodes, absorptive stubs, and common‐mode suppression (CMS) networks. resonance conditions diode‐loaded resonator both on/off states, as well design principles SBPF's, are analyzed derived. To verify concept, prototype center frequency 2.6 GHz was...

ABSTRACT For the first time, a miniaturized wideband four‐way unequal filtering power divider (FPD) based on asymmetric three‐coupled lines (A‐TCLs) is proposed. Two stepped‐impedance resonators (SIR) are loaded A‐TCL for enhancing frequency selectivity and out‐of‐band rejection. Besides, two types of resistors good output impedance matchings isolations. Design equations derived by combining methods even‐odd mode decomposition voltage‐current analysis. validation, prototype with division...

Abstract A novel high-selectivity ultra-wideband (UWB) balanced bandpass filter (BPF) with harmonic suppression characteristics is proposed. The differential-mode UWB passband constructed using quarter-wavelength asymmetrical parallel-coupled transmission lines, resulting in sharp filtering selectivity, while common-mode noises are suppressed by loading the T-type stubs. simple design method of integrating bandstop branches into BPF for third without increasing circuit size described and...

Abstract In this paper, a novel broadband high-selectivity stacked filtering antenna with multiple radiation nulls is proposed. The consists of short-circuited stepped impedance feeding line and two U-shaped strips on the bottom layer, four parasitic patches rectangular driven patch etched Г-shaped slots top layer. Short-circuited respectively introduce nulls, which greatly improves low-band edge selectivity. Two effectively increasing upper stopband rejection level. For demonstration, one...

In this article, an arbitrary-phase-difference (A-PD) transdirectional (TRD) coupler is proposed and applied in the design of a flexible Butler matrix. The A-PD TRD coupler, which also features characteristics arbitrary power division miniaturized size, composed four sections coupled lines types capacitors. Explicit equations for designing were derived utilizing even-odd mode decomposition analysis, guidelines to obtain circuit parameters given. To demonstrate procedure, examples are...

We propose compact bandpass filters (BPFs) based on a dual-mode slow wave (DMSW) substrate integrated waveguide (SIW) cavity, which consists of periodically arranged blind via holes. The ultracompact size ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\sim 0.6\times \lambda _{g}^{2}$ </tex-math></inline-formula> ) and high unloaded quality factor (~465) bring advantages to BPFs. Two-pole BPFs single...

In this brief, a wideband filtering power divider (FPD) with unequal division ratio and all-frequency absorptive feature is presented. It consisted of two transmission lines (TLs), coupled (CLs), stepped open-circuited stubs, an isolation resistor, branches. By setting different parameters for the TLs, CLs branches, distribution good responses input obtained. Besides, insertion one impedance matching between output ports are realized. Theoretical analysis proposed FPD derived parametric...

In the letter, a wideband circularly polarized dielectric resonator antenna (DRA) with wide overlapped axial-ratio and half-power beamwidths is presented. The mainly consists of irregular rectangular DRA surrounded four metal patches. For operation, excited by Z-shaped slotted ground through L-shaped feeding line. To achieve 3-dB beamwidth (ARBW), processes cutting corners grooving are used, which generates DRA. Furthermore, simple patches loaded around to widen (HPBW), also have moderating...