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Articles 1 - 6 of 6
Full-Text Articles in Electromagnetics and Photonics
Comparison Of Grid Array And Microstrip Patch Array Antennas At 28 Ghz, Zeeshan Ahmed, Patrick Mcevoy, Max Ammann
Comparison Of Grid Array And Microstrip Patch Array Antennas At 28 Ghz, Zeeshan Ahmed, Patrick Mcevoy, Max Ammann
Conference papers
A millimeter wave Grid Array Antenna for fifth generation (5G) communications is presented. The 20 cell, nearly-rhombic, 40×40 mm2 Grid Array Antenna structure is simulated and fabricated on a Rogers RT/Duroid 5880 substrate with thickness of 0.25 mm. The grid array has |S11|
Sol-Gel Silica Coated Optical Fiber Sensor For Ammonia Gas Detection, Dejun Liu, Arun Mallik, Wei Han, Qiang Wu
Sol-Gel Silica Coated Optical Fiber Sensor For Ammonia Gas Detection, Dejun Liu, Arun Mallik, Wei Han, Qiang Wu
Conference papers
A high sensitivity ammonia gas sensor based on a tapered small core single-mode fiber (SCSMF) structure for measurement of ammonia gas concentration is reported. The proposed tapered SCSMF fiber structure has a waist diameter of 13.5 μm and it is fabricated using a customized microheater brushing technique. The silica based material prepared by sol-gel method is used as a coating applied to the surface of tapered fiber structures. Experimental results show that sensor is very sensitive to ammonia. The best measurement resolution of the ammonia concentration is estimated to be 16 ppb for gas concentrations of 0.5 ppm to 2.5 …
Planar Dual-Mode Mimo Antenna With Enhanced Bandwidth, Adam Narbudowicz, Slawomir Koziel, Max Ammann, Dirk Heberling
Planar Dual-Mode Mimo Antenna With Enhanced Bandwidth, Adam Narbudowicz, Slawomir Koziel, Max Ammann, Dirk Heberling
Conference papers
The paper proposes a dual-port pa MIMO applications, optimized using optimization techniques. The antenna uses two (TM100 and TM200) to generate two indep patterns. To enhance the bandwidth of TM200 ground plane was realized as a meshed surfac approach provides 97 MHz of bandwidth, while profile of 1.5 mm between the patch and the g 3.5). The numerical optimization involved 12 adj parameters.
Towards Circularly Polarized Reconfigurable Huygens Source, Adam Narbudowicz, Max Ammann, Dirk Heberling
Towards Circularly Polarized Reconfigurable Huygens Source, Adam Narbudowicz, Max Ammann, Dirk Heberling
Conference papers
The paper investigates an array of two reconfigurable circularly-polarized antennas with omnidirectional radiation pattern. The results are based on a previously reported antenna, which offers a steerable dipolelike radiation pattern. Its capabilities allow reception of a signal from practically any direction with steering realized by rotation of the pattern around a single axis. In this paper we propose to extend this functionality by forming an array of two such antennas oriented as a Huygens source. Simulations demonstrate six distinctive radiation patterns, each illuminating a different sector of the surrounding sphere. This allows increased antenna gain and simplification of the steering …
On Pattern Reconfigurable Antennas Steered By Modulation Scheme, Adam Narbudowicz, Max Ammann, Dirk Heberling
On Pattern Reconfigurable Antennas Steered By Modulation Scheme, Adam Narbudowicz, Max Ammann, Dirk Heberling
Conference papers
The paper demonstrates how a modulation constellation can be used to steer the radiation pattern of a reconfigurable omnidirectional circularly polarized antenna. The proposed approach offers the benefit of digital beamforming while using a single antenna: the steering can be executed by low frequency electronics and independently for each frequency channel. In the proposed study, the antenna is excited by a signal generated by two I/Q modulators. By appropriately changing the I and Q components, a phase shift is generated which effectively steers the radiation pattern. The results were achieved using cosimulation between CST Microwave Studio and CST Design Studio.
Shaping The Axial-Ratio Footprint Of Crossed-Dipole Antennas, Adam Narbudowicz, Max J. Ammann, Janusz Przewocki
Shaping The Axial-Ratio Footprint Of Crossed-Dipole Antennas, Adam Narbudowicz, Max J. Ammann, Janusz Przewocki
Conference papers
A method is proposed to adaptively change the axial-ratio beam of simple circularly-polarized antennas. It is shown, that by varying the phase shift between two orthogonal elements the axial-ratio beam shape can be dynamically adjusted. This allows control of the direction of minimum axial-ratio and the ability to increase or decrease the beamwidth in one of two planes. The method is intended for satellite navigation systems: it can improve the rejection of reflected signals in varying propagation conditions (e.g. urban canyons), while using simple and low-cost circularly-polarized antennas.