An optimal beamforming strategy is proposed for performing large-field surveys with dual-polarized phased-array-fed reflector antennas. This uses signal-processing algorithms that maximize the beam sensitivity and continuity of a field view (FOV) formed by multiple closely overlapping beams. A mathematical framework newly developed numerical approach are described to analyze optimize phased array feed (PAF) system. The modeling has been applied an experimental PAF system (APERTIF prototype)...

The present-day ocean remote sensing instruments that operate at low microwave frequencies are limited in spatial resolution and do not allow for monitoring of the coastal waters. This is due to difficulties employing a large reflector antenna on satellite platform, generating high-quality pencil beams multiple frequencies. Recent advances digital beamforming focal-plane arrays (FPAs) have been exploited this paper overcome above problems. A holistic design procedure such novel multibeam...

A reduced-order model for large arrays of microstrip-fed tapered slot antennas (TSAs) is presented. The currents on the antenna conductors are modeled by a relatively small number physics-based macro-domain basis functions through technique which known as characteristic function method (CBFM). array treated metal-only structure, while wideband microstrip feeds separately using quasi-static circuit models. It demonstrated that, even though dielectric-supported non-shielded and therefore form...

Calibrating for the radiation pattern of a multi-beam Phased array feed (PAF) based radio telescope largely depends on accuracy model, and availability suitable reference sources to solve unknown parameters in model. It is shown how efficiency this calibration PAF antennas can be improved by conforming beamformed far field patterns two-parameter physics-based analytic model through use linearly constrained minimum variance (LCMV) beamformer. Through approach, which requires only few...

A K-band slot antenna element with an integrated gallium nitride power amplifier (PA) is presented. It has been optimized through a circuit-electromagnetic codesign methodology to directly match the transistor drain output its optimal load impedance (ℤ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">opt</sub> = 17 + j46 Ω), while accounting for over-the-air coupling effects in vicinity of transition between PA and antenna. This obviates need...

A phased-array fed reflector antenna system is presented which can be used for mm-wave base station applications. The proposed designed to support massive-multi-input–multi-output (MIMO) scenarios within a wide coverage ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\pm 30^\circ $ </tex-math></inline-formula> ) in the azimuth plane and limited at elevation plane. design characterization methodology has...

This paper investigates practical implementation aspects of a novel hybrid chamber concept that has been recently introduced for over-the-air testing wireless devices.The allows to synthesize spectrum plane waves (PWs) incident on device under test from wide range anglesof-arrival (AoAs) through exploiting multiple field scattering inside the overmoded waveguide chamber.An optimal design approach wave generator (PWSG) array is presented considering: (i) antenna impedance matching desired...

A single planar inverted F-antenna is proposed employing two input ports to optimally power-combine the output signals of nonlinear power amplifiers inside metal-only low-loss antenna structure. High power-added efficiency (PAE) at back-off levels reached through a Doherty combiner architecture, where optimal combination seen generally require synthesis nonsymmetric impedance matrix. The dual-fed compact and exhibits close single-mode radiation properties; it has relatively stable gain...

An approach for designing a beam-steering active phased array of antenna elements with integrated power amplifiers (PAs) is presented. It based on an amplifying unit cell (AiUC) concept, where the AiUC comprises radiating slot element, GaN high-electron-mobility transistor (HEMT), its input matching, and dc biasing/feeding circuitry. The HEMT embedded in being directly impedance-matched to HEMT's drain output, i.e., without using any intermediate potentially lossy impedance matching network....

This paper reports on the off-axis beam performance of reflector antennas fed by Focal Plane Arrays (FPAs). The FPAs are comprised many electrically small (< 0.5lambda) elements that can be used to generate multiple closely overlapping beams sky. As a result, both size and continuity telescope's Field Of View (FOV) substantially improved with respect conventional systems single-horn or cluster feeds in one-horn-per-beam configuration. FOV, combination system sensitivity instantaneous...

Novel antenna architectures for real aperture multi-beam radiometers providing high resolution and sensitivity accurate sea surface temperature (SST) ocean vector wind (OVW) measurements are investigated. On the basis of radiometer requirements set future SST/OVW missions, conical scanners push-broom antennas compared. The comparison will cover reflector optics focal plane array configuration.

A joint design approach for cointegrated antenna and power amplifier (PA), employing a high-efficiency Doherty PA (DPA) architecture including bandpass RF filter, is proposed. This realized through the optimally distributed balanced multiport feeding of cavity-backed patch element that provides desired (unique) loading conditions main auxiliary branches tailored combining. novelty advantage this solution each pair points forms virtual common center radiating element; as result, radiation...

Performance of a dense focal plane array feeding an offset toroidal reflector antenna system is studied and discussed in the context potential application multi-beam radiometers for ocean surveillance. We present preliminary design feed 5-m diameter at X-band. This optimized to realize high beam efficiency (∼ 95%) over wide scan range (±20°) with very low side-lobe cross-polarization levels.

Several electrically large Phased Array Feed (PAF) reflector systems are modeled to examine the mechanism of multiple reflections between parabolic reflectors and low-and highscattering feeds giving rise frequency-dependent patterns impedance ripples.The PAF current is expanded in physics-based macro domain basis functions (CBFs), while employs Physical Optics (PO) equivalent current.The reflector-feed coupling systematically accounted for through a multiscattering Jacobi approach.An FFT...

A novel type of hybrid measurement facility comprising a chamber antenna array (CAA) inside an overmoded waveguide (WG) is proposed and analyzed numerically. The reflecting walls the metal rectangular WG are used in conjunction with CAA to synthesize obliquely incident plane-wave (PW) fields at device under test (DUT). This enables increased flexibility emulating almost any PW multipath testing conditions without high cost complexity classical anechoic systems employing relatively large...

Krylov subspace iterative techniques consist of finding the solution a scattering problem as linear combination "generating vectors" obtained through successive matrix-vector multiplications. This letter extends this approach to domain-decomposition. Here, on each subdomain, is by constructing segments generating vector associated with subdomain and weighting these independently, which provides more degrees freedom. The method tested for sphere rectangular plate, well radiation from...

We investigate the use of a hybrid over-the-air (OTA) measurement chamber to emulate far-field testing conditions. The focus has been on generation plane wave arriving at an arbitrary angle-of-arrival (AoA) device-under-test (DUT) without mechanical steering. consists oversized waveguide (WG) and planar array antenna with adaptive beamforming. A modified linear constrained minimum variance (LCMV) beamforming algorithm is used form quiet zone (QZ) in DUT region by using reflections from WG's...

This paper describes a numerical approach for the analysis of reflector antenna system which is fed by Phased Array Feed. takes mutual interaction effects into account between array and low noise amplifiers in evaluation sensitivity optimization beamformer weights, can be used when several signal sources are present on sky, ground, inside itself. The described methodology has been applied to practical PAF (comprising 144 tapered slot antennas operating from 1 1.75 GHz) installed at 25-m...

Existing passive microwave radiometers that are used for ocean observations limited in spatial resolution and geographic coverage, due to the limitations of traditional antenna technologies using mechanically-scanning reflectors horn-type feeds. Future observation missions call new solutions, such as digitally-beamforming array feeds (DBAFs) well stationary more complex reflectors. Our studies demonstrate DBAFs can overcome physically fundamental horn feeds, capable meeting all challenging...

The manufacturing industry is connecting people and equipment with new digital technologies, enabling a more continuous stream of data to represent processes. With things connected, the interest in connectivity solution that can support communication high reliability availability will increase. fifth generation telecommunication, i.e., 5G has promising features deliver this, but factory environment introduces challenges ensure reliable radio coverage. This require efficient ways plan Factory...

Initial optimization results for the wide-band Eleven antenna and Quadruple-Ridged Flared Horn (QRFH), designed to operate as reflector feeds at 350 - 1050 MHz, are presented discussed in context of next generation radio telescope Square Kilometer Array (SKA). First, we describe procedure that has been developed carry out time-efficient multiple optics configurations system level (so maximize antenna-receiver sensitivity), then cross-compare two feed types by assessing main characteristics...