Yogesh K. Verma

Structural conservation of residues in BH1 and BH2 domains of Bcl-2 family proteins

The sequence of Bcl‐2 homology domains, BH1 and BH2, is known to be conserved among anti‐ and pro‐apoptotic members of Bcl‐2 family proteins. But structural conservation of these domains with respect to functionally active residues playing role in heterodimerization‐mediated regulation of apoptosis has never been elucidated. Here, we have suggested the formation of an active site by structurally conserved residues in BH1 (glycine, arginine) and BH2 (tryptophan) domains of Bcl‐2 family members, which also accounts for the functional effect of known mutations in BH1 (G145A, G145E) and BH2 (W188A) domains of Bcl‐2.

Large gain linear series-fed microstrip antenna arrays at Ka and C bands

In this paper, the design of a series-fed microstrip antenna array is discussed and its design challenge of limited gain is explained. It discusses that the phase between the patches of the array plays a significant role in overcoming the challenge. A 23 element series fed linear array at Ka-band gives gain of 19dBi with beam in broadside direction and has SLL better than -15dB. A scaled down version at C-band has been designed and fabricated. A 7-element series fed antenna array yielded measured gain of 15.1 dBi at 5.79 GHz. This design can be extended for planar antenna arrays to obtain higher gain.

Compact waveguide monopulse comparator at Ka-band for monopulse tracking

In this paper, a compact waveguide monopulse comparator at Ka-band for monopulse tracking is presented. Simulated results show a bandwidth of nearly 6% for a return loss of better than 10 dB, an isolation of better than 40 dB between the ports, and a null depth better than 40 dB. There is an imbalance of +0.1/-0.8 dB and 1° in magnitude and phase respectively at the output ports.