Stub (electronics)

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

A Novel Dual-Band MIMO Antenna Array With Low Mutual Coupling for Portable Wireless Devices

Abstract: In this letter, a dual-band multiple-input-multiple-output (MIMO) antenna array is proposed for portable wireless devices. The MIMO antenna array consists of two back-to-back monopoles elements with an edge-to-edge distance of 0.096 λ -(λ is the free-space wavelength at 2.4 GHz). A shorting strip and an isolation stub are designed to reduce the mutual coupling between the two elements. The MIMO antenna array has a volume of 15 × 50 × 0.8 mm3. It can cover the WLAN 2.4- and 5.8-GHz bands. The measured isolation values (S21) are lower than - 25 and - 20 dB at the 2.45- and 5.8-GHz bands, respectively. The key design parameters are presented, and the parametric study is performed.

Steel moment resisting frame beam-to-column connections

Abstract: Steel moment resisting frame (SMRF) connections between vertical columns (14) and horizontal beams (19) are for both original and retrofit building construction. The SMRF connection is a column tree assembly (13) consisting of primary trunk assembly (17) engaging secondary branch assembly (18). Primary trunk assembly (17) has vertical parallel gusset plates (25, 26) secured to vertical column (14) with flanges (27) at each beam-to-column joint location, and base plates (28) at one end of the column and a splice (33) at the other end. Secondary branch assembly (18) is secured normal to primary trunk assembly (17) between parallel gusset plates (25, 26). Secondary branch assembly (18) includes stub beam section (30) fitted with shear transfer plates (32) secured to the web of stub beam section (30) and to parallel gusset plates (25, 26). Plate (28) is secured to each flange of the stub beam (30) and parallel gusset plates (25, 26) to bridge the gap (31). Vertical shear tab plate (32) is secured to the web of stub beam (30).

Fano resonances in a single defect nanocavity coupled with a plasmonic waveguide

Abstract: Two Fano resonances are theoretically predicted in a single defect nanocavity, consisting of a rectangular cavity with a small stub defect, side-coupled with a plasmonic waveguide. These two Fano resonances are found to originate from two different mechanisms. One is caused by the excitation of a high-order resonant mode in the rectangular cavity owing to the structural breaking, and the other is attributed to the inherent resonant mode in the small stub defect. The narrow high-order mode and inherent mode couple with the broad low-order resonant mode in the rectangular cavity, giving rise to two Fano resonances. Because of the different origins, these two Fano resonances exhibit quite different responses to the variations of the structural dimensions. This has important applications in highly sensitive and multiparameter sensing in the complicated environments.

New compact six-band internal antenna

Abstract: A novel compact six-band internal handset antenna for covering the GSM (890-960 MHz), GPS (1575 MHz), DCS (1710-1880 MHz), PCS (1880-1990 MHz), UMTS (1900-2200 MHz), and ISM (2400-2480 MHz) bands is presented. The proposed antenna consists of two layer patches and a folded stub and occupies a total volume of 36/spl times/17/spl times/8 mm/sup 3/. Details of the antenna as well as the measured results are presented.

Compact Dual Band Bandpass Filter Using Novel E-Type Resonators With Controllable Bandwidths

Abstract: A compact microstrip dual band bandpass filter (BPF) using novel E-type resonators is presented in this letter. The E-type resonator is a short-circuited stub loaded hairpin resonator, two passband frequencies of which can be regulated by adjusting the characteristic impedance and electrical length of the hairpin and the stub. By combining pseudo-interdigital coupling structure, the coupling coefficients of two bands can be adjusted to a desired value in a relatively wide range. In addition, hook feed line is introduced to obtain desired external coupling degrees for two bands. Thus, controllable fractional bandwidths (FBWs) can be achieved. Two two-order 2.45/5.25 GHz dual band BPFs with 3 dB FBW 7%/7% and 5%/5%, respectively, are designed. The measured result agrees well with the simulation.