Abstract-An advanced aspheric and asymmetric large aperture dielectric lens antenna is proposed firstly here for high resolution at Wband frequency. Large aperture and aspheric lens provides minimum focusing error and high resolution in millimeter wave quasi-optics application. To the best of the authors' knowledge we design first time 500 mm large aperture lens for W-band quasi optics application. Near field radiation pattern, beam size and focal length of the lens are obtained theoretically and experimentally as well. Dielectric rod waveguide antenna is also designed and employed as a source antenna for the lens. The measured and simulated results of the DRW antenna also show very good performance at W-band frequency, and it has 15.3 dB gain with −22.5 dB sidelobe levels at 94 GHz.

No abstract

ABSTRACT:A novel compact microstrip patch antenna is proposed for quad band, GSM850, GSM900, GPS (L1-1575 and L2-1227)

No abstract

grating separation, and birefringence can be measured simultaneously. In application, the multiplexed sensors can be employed by using the changes in Bragg wavelength, birefringence, and dip separation between two gratings. The distributed sensors by using more gratings along the sensing fiber are also available. Furthermore, the use of simultaneous and multiplexed sensing measurements for the strain and birefringence related parameter is plausible, while the self calibration between them is available.ABSTRACT: Modification in tapered dielectric rod waveguide antenna is achieved by the implementation of step change in width in metallic waveguide transition. The proposed antenna has circular symmetric radiation pattern and gain about 15.3 dB with improved return loss and side lobes level at W-band. It has 10 dB beamwidth 53.2 and 48.6 in the E-and H-plane. Proposed antenna can be used for a millimeter wave quasi-optics feed array design in W-band imaging radiometer design.