Systems that can operate over wide frequency ranges with agile beam scanning and frequency hopping are receiving increased attention due to recent trends within communication, radar and EW applications. In addition to requiring wideband apertures, T/R modules, beamforming and beam shaping, a wideband multifunction antenna system must also be able to instantaneously reconfigure the array to the ...

This article presents a low-power fully-differential 3.5GHz wideband complementary metal oxide semiconductor (CMOS) lownoise amplifier (LNA) based on the LC-ladder match network approach. To have low power consumption and high power gain, two commonsource stages are cascaded for reusing the bias current. To have wideband low noise figure, the gate width of the input transistor is determined fro...

Applying numerical modeling coupled with experiments, we investigate the properties of wideband resonant reflectors under fully conical light incidence. We show that the wave vectors pertinent to resonant first-order diffraction under fully conical mounting vary less with incident angle than those associated with reflectors in classical mounting. Therefore, as the evanescent diffracted waves dr...

A new dual-polarized antenna loading frequency-selective surface (FSS) is proposed for 5G wireless local networks (WLANs) application. The antenna consists of two orthogonal bow-tie dipoles and a ground plane. A new wideband FSS is designed comprising ring-slot connecting rectangular slots. The reflection coefficient of wideband FSS is less than 0.9 from 4–6.5GHz. The phase of reflection coeffi...

Inverse scattering refers the retrieval of the unknown constitutive parameters from measured scattered wave fields, and has many applications such as ultrasound imaging, optics, T-ray imaging, radar, and etc. Two distinct imaging strategies have been commonly used: narrow band inverse scattering approaches using a large number of transmitters and receivers, or wideband imaging approaches with s...

during the last two decades, maximum likelihood estimation (ml) has been used to determine direction of arrival (doa) and signals propagated by the sources, using narrowband array signals. the algorithm fails in the case of wideband signals. as an attempt by the present study to overcome the problem, the array outputs are transformed into narrowband frequency bins, using short time fourier tran...

This paper presents an ultra-wideband (UWB) low noise amplifier (LNA) using two stage cascading topology to obtain high gain. Inductive degeneration and peaking inductor techniques are used to obtain wideband matching and flatness of gain. The proposed UWB LNA is implemented by using 180nm based CMOS TSMC technology using Advanced Design System (ADS) software.LNA achieves maximum gain of 15.5dB...

In this paper hexagonal patch shape with hexagonal slot, ultra wideband antenna is proposed. The total dimensions of antenna are 55×43.5mm. Sides of hexagonal patch are taken 13mm each and hexagonal slot sides are taken as 3mm each. The antenna resonates at two frequencies in ultra wideband range (UWB). There is enhancement in BW in upper range ultra wideband frequency from 6.2 GHz to 8.2GHz du...

The measurement results of the wideband wireless multiple-input multiple-output (MIMO) channels in outdoor environments are presented. Our wideband wireless MIMO channel sounder consists of four transmitters and eight receivers, and operates at a carrier frequency of 1.8 GHz with a bandwidth of 2.5 MHz. After obtaining the multipath delay profiles from the data collected in non-line-of-sight (N...

In this paper, a simple DFT-domain pitch-scaling technique is used to extend the audio bandwidth of wideband speech (50Hz – 7 kHz) to the super-wideband range (50Hz – 12 kHz). Therefore, the higher frequencies of the wideband signal (6 – 7 kHz) are pitch-scaled with a scaling factor of four and the resulting, scaled signal is inserted into the 8 – 12 kHz band. A subjective listening test has be...