Stub (electronics)

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

Multi-band internal antenna of symmetry structure having stub

Abstract: Provided is a multi-band internal antenna of a symmetry structure having stub, in which a size of the internal antenna can be reduced by stacking loop antennas, a broadband characteristic can be obtained in a high frequency band by connecting the stub to a top patch of the antenna, and a reduced SAR and an omni-directional radiation pattern can be obtained by configuring an antenna patch in a symmetry structure. The multi-band internal antenna includes: a top patch disposed in an upper portion of the antenna, the top patch being formed in a loop shape of which one end is opened; a stub connected to the top patch to expand a bandwidth of a high frequency band in an operating frequency of the antenna; a bottom patch connected to a ground part through a feeder part and a shorting part, the bottom patch being formed in a loop shape of which one end and another end are opened; a connecting part connecting the top patch to the bottom patch to transmit a signal from the bottom patch to the top patch; an intermediate part formed between the top patch and the bottom patch to a predetermined thickness; the feeder part for feeding power to the bottom patch; and the shorting part for grounding the bottom patch. The multi- band internal antenna is used in wireless communication fields.

Power supply system

Abstract: 1. A structure for the poWer supply of buildings, residences, offices, apartments, shops or the like, the power supply lines being passed from a connection or central (7) having overcurrent of fault current circuit breakers to individual power outlets (9) such as sockets, light or wall outlets or the like which are at least partially controllable or switchable by power switching points (10), for instance light or lighting fixture switches, each power switching point (10) being provided with one each signalling circuit (11) and the controllable or switchable power outlets (9) having one each signal receiving circuit (13), at least one, preferably two or more, control line(s) (1, 2) for weak current signals connecting the power switching points (10) at least with the controllable or switchable power outlets (9), the control lines (1, 2) serving for the transmission of coded switch signals from the power switching points (10) to the power outlets (9) for the actuation of power switching means (15), for instance relays, thyristors, triacs, in the power outlets (9) and the power supply lines (R, S, T, 0) being laid together with the control line(s) (1,2) in the form of an optionally not closed ring circuit and stub lines emanating therefrom, characterized in that the ring circuit and the stub lines are formed of flat lines (30) of optionally trapezoidal cross section and comprising the power supply lines (R, S, T), a zero conductor (0), a ground wire (E) and the control lines (1, 2), that the individual portions of the flat line (30) are connected to one another by connecting and/or branching elements (5, 8, 35, 36) containing conductors extending the power and control lines, that the flat lines (30) are connectable to the terminals of wall boxes (27) adapted to the flat lines and having continuous conductor tracks (32) of preferably determined position for the power and control lines, that modules insertable or pluggable into the wall boxes (27) are provided, the modules being formed as power outlets (9) with the signal receiving circuit (13) and/or as power switching point (10) with the signalling circuit (11) and having contact means (31, 151, 166) for picking up power and control signals connectable in the course of insertion of the module with the conductor tracks (32) for power or control signals continuing in the wall blox (32), that, in particular in the case of a reduction of the cross section of the power conductors, the controllable or switchable power outlets (9) and the power outlets (9') with free power supply in the stub line leading to the power outlet (9) in the wall box (27) each have an electronic overcurrent monitoring circuit (16) and that a cut-off signal appearing at the respective outlet of the monitoring circuit in the event of a current flow exceeding a predetermined value is feedable to a control circuit (14) of the power switching means (15) and/or via the control line(s) (1, 2) of the flat line (30) to the central (7) for actuating the fault current and/or overcurrent circuit breakers provided in the central.

High-Selective Compact UWB Bandpass Filter With Dual Notch Bands

Abstract: In this letter, a novel high selective UWB band pass filter (BPF) with dual notch bands is presented. UWB BPF is realized using open stub and short stub loaded resonator (SLR). The resonators are realized to incorporate four resonating modes in the UWB passband extending from 3.14 to 10.53 GHz. Two transmission zeroes at 3.01 and 10.68 GHz, near to the UWB passband, increases the selectivity of the filter. Half wavelength long spiral resonators as slots are implemented in ground plane to achieve notch band at 5.13 GHz and an inward folded resonator is placed near to the open SLR to achieve notch at 8.0 GHz. Measured passband insertion loss is within 1.5 dB. The prototype of the proposed UWB BPF is fabricated and measured. Simulated response of the designed BPF agrees well with the measured result.

Multi-mode microwave cavity feed system

Abstract: A feed port arrangement for a multi-mode cavity is described. Such arrangement includes a plurality of waveguide extensions which project into the interior of the cavity. Each of such extensions includes an elbow within the interior of the cavity which angles an end stub on the extension obliquely with respect to the portion of such extension extending through the cavity wall. Each of the feed ports further includes an adjustable impedance matching iris at the free end of the waveguide extension for coupling energy from the extension into the multimode cavity.