Stub (electronics)

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

Modeling of Shielded CPW Discontinuities Using the Space Domain Integral Equation Method (SDIE)

Abstract: This paper describes a rigorous numerical approach for characterizing coplanar waveguide (CPW) discontinuities. This approach develops an integral equation for the unknown electric field distribution on the slot apertures and then solves it numerically in the space domain using the method of moments (SDIE). As a demonstration, this method is applied to derive frequency dependent equivalent circuits for the case of a short-end slotline, a short- and an open-end CPW. In addition, the S-parameters of a CPW stub are computed as a demonstration of a two port discontinuity. It is shown that a shorted slotline and a shorted coplanar waveguide always behave as inductive loads. However, in the case of an open-end coplanar waveguide the even and odd excitations create different effects. Specifically, the even excitation corresponds to an inductive load while the odd excitation to a capacitive one. The results derived by the SDIE method have been extensively studied for numerical convergence and have been compared t...

Compact Dual-Polarized Continuous Transverse Stub Array With 2-D Beam Scanning

Abstract: A dual-polarized (DP) flat antenna array with passive 2-D beam-scanning capability is presented in this paper. The array consists of a DP continuous transverse stub (CTS) array, a flat Risley prism (FRP), and a line source generator. Two sets of CTSs, being constituted by the substrate-integrated waveguide (SIW), share a common aperture and are arranged orthogonally for the DP operation. A novel compact long line source is proposed for exciting this DP-CTS array. The FRP is realized by two linear phase progression phase-shifting surfaces (LPP-PSSs) and is placed above the DP-CTS array. The beam-scanning capability in the azimuth and in the elevation can be realized by rotating simultaneously the two LPP-PSSs in the same and in the opposite directions, respectively. A six-element array prototype is simulated and fabricated. According to the measured results, beam-scanning ranges of 40° in the elevation and 360° in the azimuth are achieved with the maximum gain of 17.8 dBi. The novel contributions from this paper include: 1) a novel compact long line source and 2) the first passive DP 2-D beam-scanning flat antenna array. This array can be extended easily to a higher gain or a circular polarization application.

A Novel Quad-Band Bandpass Filter Using Short Stub Loaded E-Shaped Resonators

Abstract: In this letter, a novel quad-band bandpass filter (BPF) using short stub loaded E-Type resonators is proposed. Two sets of resonators are utilized and respectively designed to realize Filter 1, operating at 2.4 and 3.5 GHz, and Filter 2 with two very closely spaced passbands, operating at 5.2 and 5.8 GHz. Then the two dual-band BPFs are combined by common feed lines with interdigital capacitance structure for quad-band responses, and two more transmission zeros (TZs) are achieved by strengthening the source-load coupling. The measured result of the fabricated filter agrees well with the simulation, which shows that the proposed structure is a good candidate for quad-band BPF designs and validates the proposed design flow well.

System for terminating optical fibers in a fiber optic connector

Abstract: A fiber optic connector assembly includes an outer housing (16) having an interior cavity (18). A termination module (20) is insertable into the cavity and includes a ferrule (24) for terminating a distal end of at least one optical fiber stub. A base (26) is attached to the ferrule and includes a channel for splicing a proximal end of the optical fiber stub to a fiber end of a fiber optic cable. A cover (34, 36) is positionable onto the base for holding the fiber stub and fiber end in the channel. A clamp (38) is provided for holding the cover onto the base. A latch (38c) is provided between the clamp and the outer housing for holding the termination module in the cavity of the housing.

Permanent magnet rotor construction wherein relative movement between components is prevented

Abstract: A rotor construction may comprise a rotor with a centrally located permanent magnet section having aligned magnet segments and having a central hole throughout its length. A thin rod of magnetic steel is located in this central hole to support the permanent magnets from within. At each end of the rod are located threaded sections for attachment to supporting end stubs. A high strength steel sleeve is interference fit over both the magnets and the end stubs to provide a mechanical link from stub to stub. The guide rod insures that the end stubs and central magnet are concentric during initial processing, prevents relative motion between the rotor components and provides support for the magnet once the sleeve is installed.