Two-dimensional beam steering using an electrically tunable impedance surface

2003 ◽  
Vol 51 (10) ◽  
pp. 2713-2722 ◽  
Author(s):  
D.F. Sievenpiper ◽  
J.H. Schaffner ◽  
H.J. Song ◽  
R.Y. Loo ◽  
G. Tangonan
Keyword(s):  
Beam Steering ◽  
Two Dimensional ◽  
Impédance Surface ◽  
Impedance Surface ◽  
Tunable Impedance

Reflection Property of the Two-Dimensional High Impedance Surface

2013 ◽  
Vol 312 ◽  
pp. 635-638
Author(s):  
Su Ling Wang ◽  
Xiao Bang Yang ◽  
Ya Ning Liu
Keyword(s):  
Radiation Pattern ◽  
Dipole Antenna ◽  
Two Dimensional ◽  
Impédance Surface ◽  
Impedance Surface ◽  
High Impedance ◽  
Reflecting Surface ◽  
High Impedance Surface ◽  
Reflection Plane ◽  
Number Of Cells

One of the properties of high impedance surface is that the phase of the reflection wave by the surface is zero.A high impedance surface was used as antenna reflecting surface. A dipole antenna was designed as radiation source. Simulation demonstrated that when the patches number of surface changed the radiation pattern changed and the gain varied also. The distance between antenna and the reflection face varied the radiation pattern also changed. Controlling the number of cells or distance between antennas from reflection plane the gain of antenna can be improved.

scholarly journals Impedance Enhancement of Textile Grounded Loop Antenna Using High-Impedance Surface (HIS) for Healthcare Applications

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3809
Author(s):  
Mohammed M. Bait-Suwailam ◽  
Isidoro I. Labiano ◽  
Akram Alomainy
Keyword(s):  
Impedance Matching ◽  
Loop Antenna ◽  
Healthcare Applications ◽  
Impédance Surface ◽  
Antenna Structure ◽  
Impedance Surface ◽  
High Impedance ◽  
Low Profile ◽  
Close Proximity ◽  
High Impedance Surface

In this paper, impedance matching enhancement of a grounded wearable low-profile loop antenna is investigated using a high-impedance surface (HIS) structure. The wearable loop antenna along with the HIS structure is maintained low-profile, making it a suitable candidate for healthcare applications. The paper starts with investigating, both numerically and experimentally, the effects of several textile parameters on the performance of the wearable loop antenna. The application of impedance enhancement of wearable grounded loop antenna with HIS structure is then demonstrated. Numerical full-wave simulations are presented and validated with measured results. Unlike the grounded wearable loop antenna alone with its degraded performance, the wearable loop antenna with HIS structure showed better matching performance improvement at the 2.45 GHz-band. The computed overall far-field properties of the wearable loop antenna with HIS structure shows good performance, with a maximum gain of 6.19 dBi. The effects of bending the wearable loop antenna structure with and without HIS structure as well as when in close proximity to a modeled human arm are also investigated, where good performance was achieved for the case of the wearable antenna with the HIS structure.

scholarly journals Reducing a Class of Two-Dimensional Integrals to One-Dimension with an Application to Gaussian Transforms

Atoms ◽  
2020 ◽  
Vol 8 (3) ◽  
pp. 53
Author(s):  
Jack C. Straton
Keyword(s):  
Quantum Theory ◽  
Arbitrary Function ◽  
Plane Waves ◽  
Wave Functions ◽  
One Dimension ◽  
Two Dimensional ◽  
Transition Amplitudes ◽  
Multidimensional Integrals ◽  
Coulomb Potentials

Quantum theory is awash in multidimensional integrals that contain exponentials in the integration variables, their inverses, and inverse polynomials of those variables. The present paper introduces a means to reduce pairs of such integrals to one dimension when the integrand contains powers multiplied by an arbitrary function of xy/(x+y) multiplying various combinations of exponentials. In some cases these exponentials arise directly from transition-amplitudes involving products of plane waves, hydrogenic wave functions, and Yukawa and/or Coulomb potentials. In other cases these exponentials arise from Gaussian transforms of such functions.

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