Results 81 to 90 of about 803,088 (203)

Dual-Band Omnidirectional Circularly Polarized Antenna

IEEE Transactions on Antennas and Propagation, 2013
A dual-band omnidirectional circularly polarized antenna is proposed. The antenna comprises back-to-back microstrip patches fed by a coplanar waveguide. A very low frequency ratio of 1.182 has been achieved, which can be easily tuned by adjusting four lumped capacitors incorporated into the antenna.
Narbudowicz, Adam, Bao, Xiulong, Ammann, Max   +2 more
openaire   +5 more sources

Multi-frequency fine resolution imaging radar instrumentation and data acquisition [PDF]

Development of a dual polarized L-band radar imaging system to be used in conjunction with the present dual polarized X-band radar is described. The technique used called for heterodyning the transmitted frequency from X-band to L-band and again ...
Champagne, E. B., Ferris, J. E., Liskow, C. L., Marks, J. M., Rendleman, R. A., Salmer, R. J.   +5 more
core   +1 more source

A Left/Right-Handed Dual Circularly-Polarized Antenna With Duplexing and Filtering Performance

IEEE Access, 2019
A shared-radiator dual-band dual-sense circularly-polarized (CP) microstrip antenna with duplexing and filtering functions is presented. For each band, there is a coupling network, which consists of a hairpin resonator, a straight slot, and a U-slot, and
Jian-Feng Li, Duo-Long Wu, Gary Zhang, Yan-Jie Wu, Chun-Xu Mao   +4 more
doaj   +1 more source

A Holographic Flat Band

, 2011
We describe a novel implementation of non-relativistic fermions in AdS/CFT by imposing Lorentz violating boundary conditions for a Dirac spinor in AdS4.
Laia, João N., Tong, David
core   +1 more source

Dual-Band Power Divider with Wide Suppression Band

ARO-The Scientific Journal of Koya University
In this paper, a planar dual-band Wilkinson power divider (DWPD) with a triangular-shaped resonator is designed. This work stands out from existing designs by addressing key limitations in conventional power dividers, i.e., physical size, harmonic ...
Salman Karimi, Golshan Mohamadpour, Saeed Roshani   +2 more
doaj   +1 more source

A Novel Concentric Annular-Ring Slot Dual-Band Circularly Polarized Microstrip Antenna

International Journal of Antennas and Propagation, 2018
A simple structure concentric annular-ring slot dual-band circularly polarized (CP) microstrip antenna operating at ISM band (2.45 GHz) and 5G band (3.5 GHz) is proposed in this paper.
Yong Cheng, Hui Liu
doaj   +1 more source

Cost-effective aperture arrays for SKA Phase 1: single or dual-band?

, 2012
An important design decision for the first phase of the Square Kilometre Array is whether the low frequency component (SKA1-low) should be implemented as a single or dual-band aperture array; that is, using one or two antenna element designs to observe ...
Colegate, T. M., Gunst, A. W., Hall, P. J.   +2 more
core  

Holographic duality between $(2+1)$-d quantum anomalous Hall state and $(3+1)$-d topological insulators

, 2016
In this paper, we study $(2+1)$-dimensional quantum anomalous Hall states, i.e. band insulators with quantized Hall conductance, using the exact holographic mapping.
Cho, Gil Young, Gu, Yingfei, Lee, Ching Hua, Qi, Xiao-Liang, Ryu, Shinsei, Wen, Xueda   +5 more
core   +1 more source

Dual-band switched beam array fed by dual-band Butler matrix

Electronics Letters, 2011
A two layer dual-band switched beam system operating at two separate frequency bands is proposed. This system consists of a dual-band 4×4 Butler matrix at the bottom layer and a dual-band microstrip antenna array at the top layer. The antenna array is fed by a Butler matrix to produce four beams that can be tilted in different four directions.
J.K. Lee, K. Chang
openaire   +1 more source

Spectral control of broadband light through random media by wavefront shaping

, 2012
A random medium can serve as a controllable arbitrary spectral filter with spectral resolution determined by the inverse of the interaction time of the light in the medium.
Aulbach, Conkey, Eran Small, Fink, Freund, Freund, Katz, Katz, Kohlgraf-Owens, Lemoult, Lerosey, McCabe, Mosk, Ori Katz, Popoff, Popoff, Small, Svensson, van Beijnum, Vellekoop, Vellekoop, Yaqoob, Yaron Silberberg, Yefeng Guan   +23 more
core   +1 more source