A novel printed crossed dipole with broad circular polarisation (CP) is proposed. This also utilised in 1 × 2 and array antennas. The proposed can produce CP because of its sequentially rotated configuration. broadband performance achieved a parasitic crossing over the original 90° phase delay line. experimental results show that single, 2, antennas yield bandwidths 15.6, 24.5, 39.2% for 3 dB axial ratio, respectively.

This letter describes a square patch antenna with switchable circular polarization (CP) sense. The proposed has four L-shaped slots on the ground plane, and CP radiation can be generated by current perturbation due to slotted plane. Because sense of is altered path that redirected switched p-i-n diodes slots, direction simply between right-handed left-handed CPs. As slot bias circuits are not placed side, simple structure radiate wave without altering main beam direction. experimental...

A crossed dipole antenna with a reconfigurable circular polarisation (CP) is proposed. This consists of pair L-shape elements λg/4 phase delay lines and DC bias circuits for pin diodes. As the state diodes mounted between feeding points changed, sequence can be varied. The CP sense proposed switched excellent electrical controllability.

In this paper, a compact antenna design method is proposed for microstrip patch antennas using double-layered defected ground structure (DGS) configuration. While conventional single-layered yields lower resonant frequency and Q-factor, smaller circuit size can be achieved an additional substrate with higher dielectric constant. The reduction obtained from the LC elements analytically explained equivalent model. characteristics of substrates are investigated various constants thicknesses....

In this letter, we propose a vertically inserted split ring resonator (SRR) in microstrip lines. Since the top and bottom layers of are electrically connected by using via holes it has 3-D shape, occupies small electrical size. Through numerical simulations measurement, is shown that can provide wider range variation bandwidth than conventional planar SRRs resonant frequency be adjusted its length width, respectively.

Bi 12 GeO 20 ceramics sintered at 800°C had dense microstructures, with an average grain size of 1.5 μm, a relative permittivity (ε r ) 36.97, temperature coefficient resonance frequency (τ f −32.803 ppm/°C, and quality factor ( Q × 3137 GHz. The 12‐ x 20‐1.5 were well both 825°C, sizes exceeding 100 μm for ≤ 1.0. However, the decreased > 1.0 because 4 Ge 3 O secondary phase that formed boundaries. 1.0) showed increased values >10 000 GHz, although ε τ similar to those ceramics. value...

The sustain driver for ac plasma display should provide alternating high-voltage pulses to ignite and recover the energy discharged from intrinsic capacitance between scanning sustaining electrodes inside panel. In this paper, an efficient circuit that employs a voltage boost-up function is proposed achieve faster rise-time would be suitable wide use of address-and-display-period-separated (ADS) driving method. improves recovery efficiency, regardless variation panel capacitance. principle...

In this paper, a planar directional beam-switchable antenna with four orthogonal beam directions is proposed. The proposed designed two crossed active elements and parasitic for each direction. design methodology described on the basis of Yagi-Uda method elements, respectively. By adjusting effective electric lengths roles director reflector are exchanged other. four-way implemented. From experimental results. verified radiation switching.

A planar beam steerable array antenna system is proposed with dual-control circuits for feeding and reactive loadings. Two orthogonally arranged dipoles are excited by SPDT switching circuits, while the forward backward directions controlled adjusted effective electric lengths of parasitic dipole elements. The designed to play alternative roles directors reflectors based on Yagi-Uda theory. four-way switchable beams has been implemented a substrate evaluated orthogonal steering performance...

A new coplanar waveguide bandstop filter using double hairpin-shaped defected ground structures is proposed. The proposed composed of etched on the plane a waveguide, and can provide narrow bandwidth rejection with high Q factor. Numerical simulations revealed that resonance frequency this device be controlled by adjusting parameters structure. Moreover, numerical measurements cascade waveguides increase bandwidth, attenuation level in band. Optimized cascaded loaded factor 21.1 more than...

A joint time allocation and energy beamforming method for the maximisation of system efficiency (EE) in multi-user multi-cell wireless powered communication network (WPCN) with distributed massive multi-input multi-output (DM-MIMO) is proposed. An iterative algorithm to solve EE problem The simulation results show that proposed scheme can achieve a significant gain. Further, it reveals achievable sum capacity DM-MIMO considerably higher than conventional centralised system.

In this paper, a new offset-fed metamaterial antenna based on slot-loaded composite right/left-handed transmission line is proposed. Two antennas, namely centre-fed and an one, have been investigated. The generates additional resonant modes with endfire radiation like patch antenna, whereas the one produces only broadside monopole antenna. one-dimensional equivalent circuit model applied to analyse structure two-dimensional microstrip cavity employed for structure. measured results are in...

A single probe-fed reconfigurable circularly polarized microstrip patch antenna with a circular slot is proposed. As one right (left) side point of the shorted between inside and rectangular patch, proposed yields - handed polarization. Each polarization modes operated at same frequency. The has been implemented experimental results have shown dual radiation characteristics.

A channel cognitive wireless sensor system is proposed for low-power network applications. Based on an RF spectrum sensing technology, the receiver designed with channel-selective operation only a valid input signal at designated frequency channel. The new architecture was implemented ISM band of 2.4-2.5 GHz. performance evaluated by Bit-Error-Rate (BER) measurements data-rate 64 kbps and random data pattern 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A compact square patch antenna with reconfigurable circular polarization (CP) at 2.4 GHz is proposed. Circular generated by an arc-shaped slot on the ground plane. In order to switch CP orientation, current flow direction of reconfigured via PIN diodes mounted slot. As and bias circuit are not placed side, proposed radiates a wave without alteration in main beam direction. From experimental results, impedance bandwidths have been demonstrated for up 80 MHz 25 MHz, respectively.

In this letter, a vertical split-ring resonator (VSRR) based on coupled coplanar waveguide (CCPW) is proposed to reduce the longitudinal length of VSRR. The resonant condition obtained using transmission line theory and odd-mode analysis. reduced CCPW. From full-wave simulations, relationship between loaded bandwidth design parameters investigated. miniaturize was fabricated measured, it verified that effective VSRR CCPW by 50% compared with previous

Abstract In this article, we present an enhanced broadband common‐mode (CM) noise filter based on periodic electromagnetic bandgap (EBG) structures with transmission lines. The unit‐cell of the proposed is composed a mushroom‐like resonator and We developed lumped circuit model lines to enable analysis using Bloch‐Floquet theorem. dispersion relations derived from theorem have CM suppression characteristics respect various parameters. Although optimizing period EBGs by line length widens...

A compact circular microstrip patch antenna with a switchable polarization (CP) is proposed at 2.4 GHz. An unequal cross-shaped slot on ground plane utilized as perturbation. By switching pin diodes mounted the slot, CP sense of each can be simply switched from left-handed (LH) to right-handed (RH) vice versa. Since perturbation made and no bias circuit required side, there less distortion radiation pattern. From experimental results for both senses, impedance bandwidth are up 150 MHz 35...

A novel dual-mode dual-band bandpass filter (BPF) is proposed that uses a bi-interdigital coupling structure for single substrate configuration. The BPF consists of microstrip feed network, ground embedded slots, and outer inner loop resonators which are excited over coupled lines with tight in the two passbands. design, analysis via equivalent circuit experimented results dealt with.

A novel bandpass filter (BPF) design based on vertical split‐ring resonators (VSRRs) was developed for single‐ and dual‐band applications. The is composed of VSRRs, transmission lines, apertures. characteristics BPFs using a single VSRR dual respectively, were investigated. arising from VSSR resonance can be controlled by the dimensions, independent VSRRs used to implement BPF. full‐wave simulation experimental measurements measure their performance. simulated results in good agreement with results.

A channel-selective super regenerative receiver (SRR) system is proposed with improved channel selectivity. The SRR operates only at a valid incoming signal due to the RF spectrum sensing functionality. To overcome rough selectivity of SRR, systemic methodology for controlling quenching waveforms. From experimental evaluations, presented excellent selection capability 3.5-MHz bandwidth. architecture can allocate least three times number channels cognitive IoT sensor networks as that previous ones.

Faults in the optical network environment propagate quickly to different parts of raising a large number alarms. This paper describes two new fault diagnosis techniques for single an network. Both operate under same premises: when occurs, central manager detects and through tests correlation information identifies failure. The performance proposed schemes is compared both analytically by simulation each other environment.