Stub (electronics)

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

Compression Tests of Cold-Reduced High Strength Steel Sections. I: Stub Columns

Abstract: This paper describes a series of compression tests performed on stub columns fabricated from cold-formed high strength steel plates with nominal yield stress of 550MPa. The steel is classified as G550 to Australia Standard AS1397. The test results presented in this paper are the first stage of an Australian Research Council research project entitled “Compression stability of high strength steel sections with low strain-hardening.” The tests include lipped-square and hexagonal sections, including 94 box-shaped fix-ended stub columns. The purpose of these tests was to determine the influence of low strain hardening of G550 steel on the compressive section capacities of the column members. The results of the successful stub column tests have been compared with the design procedures in the Australian/New Zealand Standard for Cold-Formed Steel Structures and recent (1999) amendments to the American Iron and Steel Institute Specification. As expected, the greatest effect of low strain hardening was for the stoc...

CPW-Fed UWB antenna with sharp and high rejection multiple notched bands using stub loaded meander line resonator

Abstract: This paper presents a CPW-fed UWB filter-antenna with sharp and high rejection multiple band notches for band-notched UWB communication applications. The band notch operation is achieved by employing a sharp bandstop filter (BSF) with multiple reject bands using only one element meander line resonator at the bottom layer through theoretical calculations and parametric studies. The adjustment of the notched bands is successfully accomplished by loading the meander line with open ended stubs to modify the harmonic frequencies to the desired bands. The structure of the proposed BSF is simple and compact so that the proposed filter-antenna is achieved with the same size of the reference UWB antenna without an extra area. Measurement results show that the proposed filter-antenna has two notches at the WiMAX systems operating in the 5.8 GHz (5.725–5.85 GHz) and at the international telecommunication union (ITU) operating in the 8.2 GHz (8.025–8.4 GHz). Also, it has sharp rejection characteristics at the edges of the federal communication commission (FCC) band for UWB communications. The experimental measurements are in good agreement with theoretical and simulation results for the BSF and the filter-antenna. Moreover, the filter-antenna exhibits stable omnidirectional radiation patterns except at the notched bands.

Miniaturized Dual-Band Bandpass Filter using Short Stub-Loaded Dual-Mode Resonators

Abstract: A novel miniaturized dual-band bandpass filter using two sets of short stub-loaded dual-mode resonators (SSLDMRs) is presented in this paper. It has been implemented with two parallel transmission paths for two specific passbands, which is convenient to design single-band independently. Each of them using the proposed SSLDMR results in respective passband. Meanwhile, it is easy to control the bandwidth of each passband by changing even-mode resonant frequency of the corresponding SSLDMR. Moreover, one set of SSLDMRs is embedded inside of the other one for the size compactness, which can further miniaturize the dimensions of the overall structure. To improve the selectivity and achieve a high out-of-band rejection, the source-load coupling is utilized to create four transmission zeros on either side of both passbands. The simulated and measured results are presented and show good agreement.

Radio device and electronic apparatus

Abstract: The invention provides a radio device in which multi-resonance promotion and impedance adjustment can be readily performed and a restriction in a mounting space can be dissolved, and an electronic apparatus having the same installed therein. Provision of a stub ( 123 ) having a large area and serving as a frequency matching portion as well in a folded monopole antenna ( 120 ) results in that a conductor area can be increased, and a resonance frequency can be shifted to lower frequencies. In addition, a frequency of a radio communication antenna can be readily adjusted because the resonance frequency is adjusted by cutting the stub ( 123 ).

Tunable filtering balun with enhanced stopband rejection

Abstract: For the first time a tunable balun with bandpass response by loading tunable capacitors in the split ring resonators is proposed. By tuning the capacitors’ values, the operating frequency of the balun can be tuned continuously. A shunt stub is employed to realise an additional transmission zero in the higher stopband without any influence on the bandpass response. Theoretical analysis of the filtering balun is conducted and presented. The fabricated balun indicates that the frequency-tuned range of the passband is more than 400 MHz with acceptable insertion loss, and the differences between the two output ports is 180°±5° in phase and within 0.5 dB in magnitude in this tuning range.