technologies used to implement near-field focused antennas at the microwave frequency band up to a few tens of GHz: arrays of microstrip patches and printed dipoles, arrays of dielectric resonator antennas, reflectarrays, transmitarrays, Fresnel zone plate lenses, leaky-wave antennas, and waveguide ...
The ability to dynamically focus (or, on the contrary, homogenize) the beam at any point within the near-field region of the metasurface would make the proposed system suitable for a number of emerging applications, such as microwave absorbers, able to protect sensitive antennas or electronics ...
In this paper, RISs are realized by the near-field focused antennas (NFF). A near-field channel gain model of RIS-assisted wireless communications is developed for an NFF reflectarray antenna based on the physics and electromagnetic nature of the RISs. The developed model entails t...
Impact of amplitude weights on power focusing for near‐field‐focused planar arrays This paper provides a review spanning different technologies used to implement near-field focused antennas at the microwave frequency band up to a few tens... W Wang,H Gao,Y Wu,... - 《International Journal ...
The world is populated increasingly by wireless, radar, satellite uplink and other microwave radiating systems. Regulatory bodies now require equipment designers to test electronic equipment for electromagnetic susceptibility at progressively higher field strengths. NEXRAD Doppler radars are an example of so...
However, the single microstrip planar antenna essentially provides low field intensity in the near-field region. To address this challenge, a near-field focused microstrip array antenna operating at 2.45 GHz is proposed for maximizing the power transmission efficiency between two antennas30. However, ...
An NFC (near-field communication) based wireless power transfer system design with miniaturized receiver coil for optogenetic implants. in 2018 Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS). 2018. IEEE 104. Kim, Choong Yeon, et al. “Soft subdermal implant capable of ...
Smiths Interconnect (SI), a provider of electronic components, subsystems, microwave, optical and radio frequency (RF) products, has introduced RF Solution Services for custom product requirements. With decades of experience and multitudes of proven RF filter solutions, many customers can identify Smit...
Bulk density and moisture in wheat predicted from near-field, free-space measurement at 5.8 GHz with a pair of inexpensive microstrip antennas are compared to those predicted from measurement in the far field with a pair of sophisticated focused-beam, horn/lens antennas. Results of five different...
For spatial modulations, the fabricated DCPM was measured in a near-field microwave anechoic chamber. Figure S1 presents a photograph of the measuring environment. In the procedure of measuring the near fields, the DCPM was placed on a wood platform and a waveguide probe was positioned 600 mm...