This article proposes a quad band patch antenna for mobile communication. The design requirements are to meet the 0.9 GHz, 1.8 GHz, 2.1 GHz and 2.45 GHz bands. The proposed antenna consists of a rectangular patch monopole printed antenna in which slotting technique is used to achieve multi band resonance. The Patch with three slotted lines generates four resonating frequencies to cover 0.9 GHz ...

Since the FCC has announced to allow the unlicensed use of the industrial, scientific, and medical (ISM) frequency band by any potential users, wireless communications community has provided enormous opportunities for driving many wireless systems that can be communicated over short distances. For example, some practical applications are operated at the internationally available unlicensed ISM ...

We report on the detection with the Infrared Space Observatory (ISO) of a molecular band at 57.5 μm (174 cm) in carbon-rich evolved stars and in Sgr B2. Taking into account the chemistry of these objects the most likelihood carrier is a carbon chain. We tentatively assign the band to the ν5 bending mode of C4 for which a wavenumber of 170-172.4 cm has been derived in matrix experiments (Withey ...

Context. Studying the composition of dust in the interstellar medium (ISM) is crucial for understanding the cycle of dust in our galaxy. Aims. The mid-infrared spectral signature of amorphous silicates, the most abundant dust species in the ISM, is studied in different lines-of-sight through the Galactic plane, thus probing different conditions in the ISM. Methods. We have analysed ten spectra ...

the rotation curves of a sample of 46 low- and high-surface brightness galaxies are considered in the context of milgrom's modi_ed dynamics (mond) to test a new interpolating function proposed by zhao et al. (2010) [1] and compare with the results of simple interpolating function. the predicted rotation curves are calculated from the total baryonic matter based on the b-band surface photometry,...

it is inferred from the symmetrical and luminous x-ray emission of fossil groups that they are mature, relaxed galaxy systems. cosmological simulations and observations focusing on their dark halo and inter-galactic medium properties confirm their early formation. recent photometric observations suggest that, unlike the majority of non-fossil brightest group galaxies (bggs), the central early-t...

Background Ofcom is currently examining the potential uses of the 2300 – 2400 MHz frequency band that is being released by the Ministry of Defence in the United Kingdom. Given the rising demand for broadband communications, one possible use is to support LTE systems in a time division duplex (TDD) arrangement. The band is directly adjacent to the unlicensed 2.4 GHz industrial, scientific and me...

The H II region W40 harbors a small group of young, hot stars behind roughly 9 magnitudes of visual extinction. We have detected gaseous carbon monoxide (CO) and diatomic carbon (C2) in absorption toward the star W 40 IRS 1a. The 2-0 R0, R1, and R2 lines of 12CO at 2.3 μm were measured using the CSHELL on the NASA IR Telescope Facility (with upper limits placed on R3, R4, and R5) yielding an NC...

We report the spectrum of Orion-BN/KL between 5.3 and 7.2 mm observed with the Short Wavelength Spectrometer (SWS) on board the Infrared Space Observatory. H2O lines of the –0 bending mode with l ! n 5 1 2 6.3 mm (the R-branch) are observed in absorption, while lines with l 1 6.3 mm (the P-branch) are observed in emission. Radiative transfer models including the (0, 0, 0), (0, 1, 0), and (0, 0,...