Anisotropic dielectric response occurs naturally due to the presence of gradation, like in functionally graded materials or graded biological cells. However, these materials with locally anisotropic dielectric responses can have macroscopically isotropic responses. In treating graded particles of anisotropic materials, traditional isotropic gradation methods need to be modified. In this work, w...

In this paper, we demonstrate three-dimensional estimation of target positions with borehole radar in single borehole. We developed array type borehole radar having four dipole antennas with optical modulators. Experiment at a model site was done using the developed radar system. In the site, one borehole, in which there is no fluid, and one cave exist. Receiving dipole antennas and a transmitt...

This paper proposes to transform microwaves for snow melting, which slightly leaking from the slotted waveguide, into electric power using a wireless transmission technique effective use. A combination of left-handed and right-handed waveguides is method melt evenly over large area microwaves. The however, has loss because stubs. In order evaluate effect waveguide’s loss, this analyzed efficien...

Close agreement between the measured and predicted insertion loss between dipole antennas above a conducting ground plane has produced a calculable standard dipole antenna. Antenna factors of dipole antennas in the frequency range 30 MHz to 500 MHz have been determined to an uncertainty of 0.1 dB. Though the design of the dipole is not new, the key achievements are: the use of a large standard ...

A compact series-fed, omnidirectional printed dipole array for millimeter-wave (mm-wave) bands n257, n259, and n261 is proposed. series feed technique with microstrip to grounded-co-planar waveguide (CPW) transition was used the antenna. The prototype fabricated measured range from 27.25 28.5 GHz. peak gain 10.3 dBi a maximum azimuthal ripple of 4.4 dB.

the possibility of terahertz generation has been investigated from a photoconductive switch based on gaas, gated by a femtosecond laser. the emission properties of photoconductive antenna (pca) with low-temperature-grown (lt) gaas have been studied. in such gaas materials presence of the charged defects induces a redistribution of the electric field between the antenna electrodes. this effect h...

This paper proposes a dual-polarization dipole antenna for cylindrical phased array working in Ku-band. The is double-layer structured and composed of two orthogonal butterfly shaped radiators, ground co-planar waveguide (GCPW) feeding structures vias. Each the shape butterfly. patch grooved triangularly one side it bent into an N shape, which effectively expands frequency band antenna. structu...

Abstract We propose a metasurface antenna capable of real-time holographic beam steering. An array reconfigurable dipoles can generate on-demand far-field patterns radiation through the specific encoding meta-atomic states i.e., configuration each dipole. Suitable for generation desired be identified using iteration, but this is very slow and needs to done pattern. Here, we present deep-learnin...

1. Abstract In this design, the dual band dipole antenna feed network with wide bandwidth tapered microstrip balun is studied. The design and experimental results of low profile embedded microstrip dipole antenna with tapered microstrip balun shows fairly good performances. The feed network of the design with wider bandwidth and lower power loss tapered microstrip line to overlap coplanar strip...

─ A novel loop-loaded printed dipole (LLPD) with a wideband balun structure is presented for aiming a dual-band antenna operation at 3.0/5.5 GHz bands. The proposed balun structure alone demonstrates VSWR<1.5 performance over a 3:1 bandwidth. As the loop elements placed on the antenna aperture provides dual-band operation with at least 15% impedance bandwidths, the wideband balun/feed allows fo...