Stub (electronics)

About: Stub (electronics) is a research topic. Over the lifetime, 8172 publications have been published within this topic receiving 75018 citations.

Application of stub loaded folded stepped impedance resonators to dual band filter design

Abstract: In this paper, a folded stepped impedance resonator (SIR), modifled by adding an inner quasi-lumped SIR stub, is used as a basis block for a new implementation of dual-band bandpass fllters. The main advantage of the proposed fllter is to make it possible to independently control the electrical features of the flrst and second bands. The behavior of the flrst band basically depends on the geometry of the outer folded SIR. The second band, however, is strongly in∞uenced by the presence of the inner stub. Additional design ∞exibility is achieved by allowing the inner stub to be located at an arbitrary position along the high impedance line section of the main SIR. The position of the tapped input and output lines can be

Compact printed ultra-wideband slot antenna with a band-notched operation

Abstract: A compact printed ultra-wideband (UWB, 3.1–10.6 GHz) circular-slot antenna with a notched frequency band at 5 GHz is presented. The antenna is a uniplanar structure and occupies a compact area of 25 × 26 mm2 only (the side length is less than 27% of the lower edge frequency at 3.1 GHz). The antenna has a U-slotted circular stub embedded inside the circular slot. By choosing the length of the U-slot cut in the circular stub to be about a half-wavelength of the desired notched frequency, band-notched UWB operation is obtained. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 45: 128–130, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20746

Enhancement of thermoelectric properties in graphene nanoribbons modulated with stub structures

Abstract: The thermoelectric properties in graphene nanoribbons modulated with stub structures are studied using atomistic simulation of electron and phonon transport. The results show that the phonon transport is dramatically suppressed by the elastic scattering of the stub structure; while the thermopower S can be enhanced by a few times of magnitude. This leads to a strong enhancement of the figure of merit (ZT). Moreover, it is found that the enhancement of ZT can be effectively tuned by modulating geometric parameters of the stub and edge shapes, which offers an effective way to improve the thermoelectric performance of graphene nanoribbons.

Plasma generation in electron cyclotron resonance

Abstract: Electron cyclotron resonance (ECR) is achieved in a source chamber of a size which is non-resonant with respect to propagation of the microwave power within the chamber. The microwaves are delivered into the chamber via a waveguide and window so that breakdown occurs initially only in a region in the vicinity of the window. A dielectric coupler between the waveguide and the window has a larger end and a smaller end and is filled with a dielectric material. The magnetic field generator for stimulation the electron resonance in the chamber includes a pair of conductive current carrying coils coaxial with each other and with an axis of the chamber, the coils being arranged in a Helmholtz configuration. The waveguide includes a microwave stub tuner for tuning the propagation and absorption of the microwave power in the plasma within the chamber to control the location and shape of the region in which the plasma is formed. A conduit provides a path for delivery of the plasma from one end of the chamber and is sized to be non-resonant with respect to propagation of the microwave energy. The magnetic field is controlled to cause the formation of the plasma with high absorption of microwave power occurring substantially within a columnar region centered on an axis of the chamber. The chamber has an insulative lining.

An 8-Element Dual-Band MIMO Antenna with Decoupling Stub for 5G Smartphone Applications

Abstract: An 8-element dual-band multiple-input–multiple-output (MIMO) antenna operating in the 5G New Radio band n77 (3300–4200 MHz) and 5 GHz band (4800–5000 MHz) in mobile handsets is presented. The 8-element MIMO antenna is formed by employing four sets of dual-antenna arrays (DAAs) that are symmetrically printed along the two long side–edge frames of the smartphone. Each DAA is composed of two double-branch monopoles and a T-shaped decoupling stub, in which good mutual coupling reduction can be realized via the decoupling structures. Furthermore, the decoupling structures can also aid in improving the impedance matching of the array units for achieving wideband operation.