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This paper presents a wideband Archimedean spiral antenna under superstrate loading and backed by a 3D printed novel shape ground structure which provides directional radiation pattern with acceptable axial ratio and gain characteristics.
Currently, the next generation (5G) mobile communication system has been actively investigated all over the world, in order to satisfy the future expected requirements, such as super high bit rate. Here, one of the approaches is to utilize the high-SHF (over 6 GHz) and EHF (mainly 30 – 100 GHz) bands. Here, in order to determine the carrier frequency bands for 5G, frequency dependency of path loss...
We experimentally demonstrate a photonic RF sampling system that utilizes chirp processing of ultrafast laser pulses to achieve all-optical high-rate pseudorandom patterning and inner product integration for compressed sensing measurement. We successfully acquire multi-tone sparse radio frequency (RF) signals at arbitrary offsets from the reconstruction basis frequencies in an 11.95 GHz bandwidth...
Currently, the next generation (5G) mobile communication system has been actively investigated all over the world, in order to satisfy the future expected requirements, such as super high bit rate. Here, one of the approaches is to utilize the high-SHF (above 6 GHz) and EHF (mainly 30 – 60 GHz) bands. These bands are very attractive because wider frequency bandwidth is relatively easily obtained....
We demonstrate 119.2-GSample/s compressive microwave frequency detection using spectrally-encoded ultrafast laser pulses. We sense sparse tones over > 35-GHz instantaneous bandwidth with 2-MHz accuracy using < 300 consecutive compressive measurements acquired at a 400-MHz rate.
A 120∶1 frequency divider in 65-nm CMOS process is proposed. As a critical part of a 12.6 GHz PLL, the divider circuit divides the 12.6 GHz signal by a factor of 120 to achieve a 105 MHz reference signal. The design includes an 8∶1 analog common mode logic (CML) divider followed by a 15∶1 digital frequency divider. The measurement results show that it achieves a low phase noise of −109 dBc/Hz at 1...
This paper presents outdoor wideband 8×8 multiple-input multiple-output (MIMO) channel measurements using dual-polarized antennas at 11 GHz. The measurements were conducted in the urban and residential areas of Ishigaki city, Okinawa, Japan. The differences in polarization for MIMO capacity and efficiency are discussed with respect to the dependency on local propagation environments. The MIMO capacity...
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