Results 11 to 20 of about 206 (155)

Three‐state pattern reconfigurable active antenna integrated with Gunn oscillator and switched‐line phase shifter

Electronics Letters, Volume 59, Issue 12, June 2023., 2023
In this paper, a novel active integrated array antenna (AIAA) is introduced for the purpose of enabling pattern switchable functionality. Abstract In this paper, a novel active integrated array antenna (AIAA) is introduced for the purpose of enabling pattern switchable functionality.
Maodudul Hasan, Eisuke Nishiyama, Takayuki Tanaka, Ichihiko Toyoda   +3 more
wiley   +1 more source

A first‐harmonic push–push oscillator based active integrated dual‐beam switchable array antenna

Electronics Letters, Volume 59, Issue 5, March 2023., 2023
Conceptual diagram of the proposed beam switchable AIAA. The proposed AIAA comprises a first‐harmonic push–push oscillator, four linearly polarized microstrip antennas, and a switchable feed network. By using the switchable feed network, the main beam direction of the radiation pattern can be switched between two states.
Maodudul Hasan, Eisuke Nishiyama, Takayuki Tanaka, Ichihiko Toyoda   +3 more
wiley   +1 more source

The Development of Planar Gunn Diodes for the realisation of MMIC Oscillators [PDF]

1st Annual Active and Passive RF Devices Seminar, 2013
This review presents the development of planar Gunn diodes over the last few years for the implementation of millimetre-wave sources. The fabrication procedure incorporates electron beam lithography and the oscillation frequency is determined by the anode-to-cathode distance.
Papageorgiou, V., Khalid, A., Li, C., Dunn, G. M., Cumming, D. R. S.   +4 more
openaire   +1 more source

SIGNAL FORMATION AND PROCESSING FEATURES FROM AUTODYNE RADAR WITH A WIDE FREQUENCY MODULATION BAND. (РART 1)

Radio Physics and Radio Astronomy, 2022
Subject and Purpose. In Part 1 of the paper, a mathematical model of an autodyne self-oscillator with frequency tuning by varactor capacitance varying is built and thoroughly analyzed for the features of signal formation in autodyne radar with a wide ...
G. P. Ermak, A. S. Vasilev, A. V. Varavin, Balaban, A. V. Fateev, V. N. Zheltov   +5 more
doaj   +1 more source

Over seven decades of solar microwave data obtained with Toyokawa and Nobeyama Radio Polarimeters

Geoscience Data Journal, Volume 10, Issue 1, Page 114-129, January 2023., 2023
Upper left: Toyokawa Radio Polarimeter (ToRP: Behnde) and 8‐element solar grating array (Front). Upper Right: Nobeyama Radio Polarimeter (NoRP). Lower: Long‐term variation of microwave fluxes (colors) and sunspot (black) from the 1950s to 2021. Abstract Monitoring observations of solar microwave fluxes and their polarization began in Japan during the ...
Masumi Shimojo, Kazumasa Iwai
wiley   +1 more source

Graphene‐Based Microwave Circuits: A Review

Advanced Materials, Volume 34, Issue 48, December 1, 2022., 2022
A comprehensive review on the employment of graphene in microwave circuits is presented. The review starts with methods of the growth and transfer of graphene followed by different graphene‐based devices. Thenceforth, exploiting these devices in different circuits is discussed.
Mohamed Saeed, Paula Palacios, Muh‐Dey Wei, Eyyub Baskent, Chun‐Yu Fan, Burkay Uzlu, Kun‐Ta Wang, Andreas Hemmetter, Zhenxing Wang, Daniel Neumaier, Max C. Lemme, Renato Negra   +11 more
wiley   +1 more source

THE RESONANT SYSTEM OF A SUB-TERAHERTZ LOCAL OSCILLATOR

Radio Physics and Radio Astronomy, 2022
Purpose. The excitation efficiency is investigated of the first higher-order axially asymmetric oscillation mode (TEM10q) excited in a hemispherical open resonator (OR) at the frequencies of the fundamental and second-order harmonics of the Gunn diode in
I. K. KUZMICHEV, B. I. MUZYCHISHIN, А. Yu. POPKOV, Аlexander V. MAY, Alexey V. MAY   +4 more
doaj   +1 more source

Profiling of Plant Derived Natural Constituents by Using Magnetic Resonance Techniques

Concepts in Magnetic Resonance Part A, Volume 2022, Issue 1, 2022., 2022
Plants are reservoirs of naturally occurring chemical constituents with a wide range of structural diversity. These biological compounds can be derived from different parts of plants such as leaves, barks, seeds, seed coats, flowers, and roots. A broad array of secondary metabolic compounds is present in the plants such as antibiotics, alkaloids ...
Anupama Anand, Anshu Sharma, Harpreet Kaur Saini, Somesh Sharma, Ruchi Sharma, Chahat Thakur, Priyanka, Maria Atanassova, Gianluca Caruso, Ardalan Pasdaran, Emre Erdem   +10 more
wiley   +1 more source

Evaluation of Manganese Cubanoid Clusters for Water Oxidation Catalysis: From Well‐Defined Molecular Coordination Complexes to Catalytically Active Amorphous Films

ChemSusChem, Volume 14, Issue 21, Page 4741-4751, November 4, 2021., 2021
Film star: Cubanoid tetranuclear and octanuclear manganese complexes are synthesized and electrodeposited on an active surface to compare their electrocatalytic activity for the water oxidation reaction. A simple, direct relationship is derived between the manganese content in the precursor and the oxygen evolution activity of the deposited films ...
Soosan Hosseinmardi, Andreas Scheurer, Frank W. Heinemann, Karsten Kuepper, Laura Senft, Pablo Waldschmidt, Ivana Ivanović‐Burmazović, Karsten Meyer   +7 more
wiley   +1 more source

Dinuclear Zn Complex: Phenoxyl Radical Formation Driven by Superoxide Coordination

Zeitschrift für anorganische und allgemeine Chemie, Volume 647, Issue 8, Page 809-814, April 26, 2021., 2021
Abstract The dinuclear zinc complex Zn2L2 (HL=2‐{[[di(2‐pyridyl)methyl](methyl)amino]methyl}phenol) has been synthesized and isolated as colorless crystals. The interaction of the compound with superoxide in anhydrous organic solvents has been evaluated by CV, stopped‐flow Uv‐vis, EPR and ESI‐MS suggesting the binding and the activation of the ...
Andrea Squarcina, Dominik Fehn, Laura Senft, Jens Langer, Ivana Ivanović‐Burmazović   +4 more
wiley   +1 more source