Broad dual-band asymmetric transmission of circular polarized waves in near-infrared communication band

Refractive Dual Band Infrared Imager Optical Design

Infrared imagers are important for reorganization and monitoring. This paper discusses the design of an infrared imager. Optical design in medium wavelength infrared (MWIR) and long wavelength infrared (LWIR) bands is different and needs distinct detectors and materials. Reflective systems are not suitable due to their small field of view (FOV) and vignetting. Refractive dual band optical syste...

Dual Band Dual Polarized Slot Cut modified Circular Microstrip Antenna

A new broadband and dual band circular slot cut modified circular microstrip antenna is analyzed and proposed. The parametric study to analyze the effects of circular slot which realizes broader bandwidth is presented. The circular slot creates two additional resonant modes near the fundamental TM11 mode resonance frequency of the equivalent circular patch and yields bandwidth of 202 MHz (8%). ...

Broad-band frequency references in the near-infrared: Accurate dual comb spectroscopy of methane and acetylene

The Doppler-limited spectra of methane between 176 THz and 184 THz (5870–6130 cm ) and acetylene between 193 THz and 199 THz (6430–6630 cm ) are acquired via combtooth resolved dual comb spectroscopy with frequency accuracy traceable to atomic standards. A least squares analysis of the measured absorbance and phase line shapes provides line center frequencies with absolute accuracy of 0.2 MHz, ...

Dual band complementary metamaterial absorber in near infrared region

Dual Band Slotted Patch Antenna for On/Off-body Communication

Body Centric Wireless Communication (BCWC) has been topic of much research in recent years. In this manuscript, a novel low-cost microstrip patch antenna is designed for on-/off-body communication with a dual-band operation. The proposed structure exhibits a monopole-like radiation pattern at 2.45 GHz and a broadside radiation at 4.8 GHz, simultaneously. Lateral dimensions of 42 mm × 46 mm and ...