Foldedand multiple-slot antennas have been used for quasi-optical arrays. However, there is lack of information of these antennas, especially on finite substrates. In this paper, CPW-fed foldedand multiple-slot antennas are analyzed using FDTD technique with improved absorbing boundary condition (PML method). The effects on the effective dielectric constant and input impedance due to substrate ...

We developed curved spiral antennas for use in underwater (freshwater) communications. Specifically, these antennas will be integrated in so-called mussel backpacks. Backpacks are compact electronics that incorporate sensors and a small radio that operate around 300 MHz. Researchers attach these backpacks in their freshwater mussel related research. The antennas must be small, lightweight, and ...

Microstrip antennas are widely employed in communication system and seekers. Microstrip antennas posse's attractive features such as low profile, flexible, light weight, small volume and low production cost. In addition, the benefit of a compact low cost feed network is attained by integrating the RF frontend with the radiating elements on the same substrate. Microstrip antennas are widely pres...

Biomedical industry is in continuous growth in the last few years. Compact antennas are crucial in the development of biomedical systems on human body. The interaction between printed antennas and human body has been investigated in this paper. Antennas electrical performance is altered significantly in vicinity to human body. This paper presents the performance of several printed antennas as a...

The concept of optical antennas in physical optics is still evolving. Like the antennas used in the radio frequency (RF) regime, the aspiration of optical antennas is to localize the free propagating radiation energy, and vice versa. For this purpose, optical antennas utilize the distinctive properties of metal nanostructures, which are strong plasmonic coupling elements at the optical regime. ...

S i n c e N o v e m b e r 7 , 1996, (he Ga/i/eo orbifa/ tour of Jupjfer and jts m o o n s (Ganymede, Callisto, and Europa) is routinely supporied by a massive array of large antennas: two 70-meter antennas in GDSCC2 (California) and CDSCC3 (Australia), a 64meter antenna at Parkes (Australia), and addifiona/ 34-reefer antennas at CDSCC. The scope of this array is unprecedented it operates daily ...

This paper investigate some methods for converting single band antennas to multiband antennas so that all single band antennas convert in multiband antennas and gives multiband facility without increasing the cost of manufacturing. Simulation is performing on Ansoft HFSS and corresponding result are shown by figures. Impedance bandwidth, VSWR and Return loss are observed for the proposed antenn...

The investigations on U-slot loaded and V-slot loaded proximity coupled microstrip antennas are reported. The performances of two antennas are investigated in frequency band of high performance wireless local area network (HIPERLAN/2) using IE3D software and the computed results are verified by measurement. Results show that the antennas have wide bandwidth and moderate gain and may be used as ...

We determine the sensitivities of the EVLA and VLA antennas over their full tuning ranges through analysis of the correlation coefficients. Interim EVLA antennas can tune over the full range of 940 through 2200 MHz. The prototype L-band OMT shows good performance over its design frequency range. The betterperforming interim EVLA antennas meet the Project Book sensitivity requirements above ∼115...