GaAsSb/InP type-II transistors have been fabricated with fT > 325 GHz and fMAX > 275 GHz. This work will examine the layer structure design criteria allowing the fT to improve from 244 GHz to 358 GHz and the effects this has on the corresponding fMAX. Additionally, the process improvements to control the undercut into the active region during the base contact isolation etch will be discussed. T...

Polybutylene succinate (PBS) has become a potential candidate, similar to polypropylene (PP) and acrylonitrile butadiene styrene (ABS), for use as an organic plastic material due to its outstanding mechanical properties as well as high thermal deformation characteristics. A new composition of silica aerogel nanoparticles extracted from rice waste with PBS is proposed for use as a dielectric (εr...

Based on the radio light curves in 22 GHz and 37 GHz from the Metsahovi monitoring program and the optical light curves in BVRI bands from previously published results and the “Whole Earth Blazar Telescope” (WEBT) archives, we analyze the time delay among 22 GHz, 37 GHz and optical bands (B, V, R, I) of BL Lacertae by means of discrete correlation method. The results suggest there exist strong ...

In this paper, the design, fabrication and measurement of a microstrip patch antenna is reported which can be operated at four frequencies – 5.215 GHz, 5.5 GHz, 5.69 GHz and 6.16 GHz. The simulation is done using IE3D software.

Context. The nature and evolutionary properties of the faint radio population, responsible for the steepening observed in the 1.4 GHz source counts below 1 milliJy, are not yet entirely clear. Radio spectral indices may help to constrain the origin of the radio emission in such faint radio sources and may be fundamental in understanding eventual links to the optical light. Aims. We study the sp...

Th is paper presents Ansoft HFSS based parametric analysis and design of UWB b icone antenna. The design frequency of proposed antenna is 2.4 GHz. Th is antenna covers the 1.3 ~ 17.5 GHz frequency band with Return loss less than -10 dB. The bandwidth has been achieved by making a simple and easy modification in the design parameter of the bicone antenna. The voltage standing wave ratio (VSW R) ...