We report an electronically switchable dielectric leaky wave antenna. The main beam angle can be electronically steered using p-i-n diodes. The diodes are used as switches to control the radiation from two sets of gratings with different periods, thereby switching the main beam angle. Beam steering is achieved at a single fixed frequency; no frequency sweeping is necessary. A microwave prototyp...

acute leukemia which is the most common cancer in children is a heterogeneous group of clonal malignancies. the conversion of the leukemic cell lineage during the course of the disease or later is termed lineage switch. it has been rarely reported in the literature. in leukemia lineage switch, conversions from lymphoblastic leukemia to myeloid leukemia or vice versa are reported. herein, we rep...

the environmental scanning electron microscopy (esem) is a new development in the field of electron microscopy. in this study esem has been used to study the structure of veal semimembranosus muscle. four treatments, raw (control), conventional heating, domestic and industrial microwave heating, were observed using esem. the temperature used in conventional heating was 163 0c. frequency app...

We theoretically investigate programming the functionality of photonic crystals (PCs) by reconfiguring the random location of defects. It is shown, via numerical finite-difference timedomain simulations, that the random spatial location of defects, implemented as identical changes in refractive index with respect to the host lattice, has the potential to enable realizing a large number of funct...

The Army Research Laboratory (ARL), in collaboration with the Air Force Phillips Laboratory, has been developing the fabrication process for lateral topology, highpower photoconductive semiconductor switches (PCSS) used in phased-array, ultrawideband (UWB) sources. This work presents issues associated with the development of these switches. First-generation devices (1.0 em gap spacing) have bee...

The design and test of microstrip slot antenna array for 3D microwave imaging for the structural assessment of concrete structure is presented in this paper. The array contains 16 antenna elements and uses microstrip feed network for the ease in the design. It also adopts commercially available PIN diodes as switches to control the sequence of turning on or off microstrip slot antenna elements....

This paper reviews the recent progress in MEMS for radio frequency (RF) applications from a device perspective. RF MEMS devices reviewed include switches and relays, tunable capacitors, integrated inductors, mechanical resonators and filters, and some representative microwave and millimetre-wave components. Important device parameters are highlighted, as they have significant contributions to t...

Centaurus (Cen) A represents one of the best candidates for an isolated, compact, highly polarized source that is bright at typical cosmic microwave background (CMB) experiment frequencies. We present measurements of the 4× 2 region centered on Cen A with QUaD, a CMB polarimeter whose absolute polarization angle is known to 0.5. Simulations are performed to assess the effect of misestimation of...

Recent studies show that high-power cross-technology interference is becoming a major problem in today’s 802.11 networks. Devices like baby monitors and cordless phones can cause a wireless LAN to lose connectivity. The existing approach for dealing with such high-power interferers makes the 802.11 network switch to a different channel; yet the ISM band is becoming increasingly crowded with div...

Coaxial switches are commonly used in applications where RF signal routing is required between one or more locations, via some form of switch driving hardware (to power the switch) and software/firmware (to navigate the various switch paths). Depending on the complexity of the switching matrix, a considerable amount of setup and configuration will be required. With the advent of USB, widely rec...