Stub (electronics)

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

Method of making an optical fiber by laser cleaving

Abstract: A field-installable connector includes a connector housing and a ferrule having front and rear opposed faces and at least one fiber bore defined longitudinally therethrough. A laser processed stub optical fiber is disposed within the one fiber bore of the ferrule and extends a predetermined distance beyond the rear face of the ferrule. An alignment feature is operable for self-centering the stub optical fiber and a field optical fiber to perform a mechanical splice using a camming means. A method of laser processing a stub optical fiber includes rotating the stub optical fiber and sweeping a laser beam directed at a desired angle back and forth across a surface of the optical fiber. An oscillating motion of the laser is driven by an intermittent sinusoidal signal that results in two deposits of energy onto the stub optical fiber followed by a cooling period before subsequent deposits of energy occur.

Miniature Coplanar-Fed Folded Patch for Metal Mountable UHF RFID Tag

Abstract: A folded patch, which is centrally fed by a coplanar feedline, is proposed for designing a miniature UHF tag antenna for mounting on metal surfaces. The tag is designed using a flexible polyethylene terephthalate substrate with a very compact size of 25 $\text {mm} \times 40\,\,\text {mm} \times 3$ mm ( $0.0767\lambda \times 0.123\lambda \times 0.0092\lambda$ ). Conjugate match is attainable between the antenna and the microchip and it is able to achieve a maximum read distance of 10.7 m at the effective isotropic radiated power of 4 W. In the design, two notches have been incorporated with an inductive stub for tuning of the tag’s resonance over a larger frequency range. Also, a simple equivalent circuit has been derived to characterize the impedance of the tag antenna. The resonant frequency of the proposed tag antenna is found to be insensitive to various sizes of the backing metal object, which is a very desirable feature for tag design. The proposed tag can achieve a read distance of greater than 10 m when placed on metal. It is able to be read beyond 5 m when it is placed on dielectrics with permittivity in the range of 1–5.8.

Compact Dual-Band Differential Bandpass Filter Using Quadruple-Mode Stepped-Impedance Square Ring Loaded Resonators

Abstract: In this paper, a new quadruple-mode stepped-impedance square ring loaded resonator (SI-SRLR) is proposed, and a high-performance dual-band differential bandpass filter (BPF) is developed. Resonant characteristics of the SI-SRLR are investigated by the even-/odd-mode method and simulation techniques. Two differential-modes (DMs) of the SI-SRLR are used to form the dual differential passbands. The admittance ratio $K$ of the SI-SRLR is chosen appropriately to prevent the common-mode (CM) interference with DM operations. Moreover, an open-circuited stub is added to enhance the CM suppression, while a source-load coupling is introduced to produce multiple transmission zeros and improve significantly the frequency selectivity of DM passbands. Finally, a dual-band differential BPF is designed, fabricated, and measured. Good agreement between the simulated and measured results verifies well the proposed structure and design method.

Trapezoid UWB antenna with dual band-notched characteristics for WiMAX/WLAN bands

Abstract: A trapezoid monopole antenna with dual band-notched characteristics for UWB is presented. The antenna consists of a trapezoid patch and a rectangular ground plane. To realise dual notched-band characteristics, a U-shaped stub and a T-shaped stub are embedded in two trapezoid slots of the radiation patch, respectively. The measured results show that the proposed dual notched-bands planar has an impedance bandwidth of 3-11 GHz for VSWR <; 2, except two frequency notched bands of 3.3-3.7 GHz (WiMAX band) and 5.15-5.825 GHz (WLAN band). Both the measured and simulated results of the proposed antenna are presented, indicating that the antenna is a good candidate for UWB applications.

Combination frame-supported box receiver and self-stabilizing bed extension

Abstract: The present invention makes beneficial use of a vehicle's single point box receiver hitch by transferring an underlying frame mount of the box receiver both outward and adjustably upward simultaneously for load transfer at to a load-supporting cross beam in order to provide a two-axis, cantilevered extension for a pickup truck. The extension apparatus when viewed from above is T-shaped and includes two pieces constructed from box iron. One piece is a longitudinal-running box beam welded at an upward cantilever angle to a short stub section. The second piece is T-shaped when viewed from above and it includes a single adjustment telescoping transition beam which serves as the transition from the longitudinal box beam to the load-supporting cross beam that is transversely oriented relative to the longitudinal beam. A second stub is rigidly connected to the cross beam and it is adjustable by being telescoped over the first angled stub.