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Full-Text Articles in Systems and Communications
A Simple Polarization Reconfigurable Printed Monopole Antenna, Afshin Panahi, Xiulong Bao, Kansheng Yang, Oisin O'Conchubhair, Max Ammann
A Simple Polarization Reconfigurable Printed Monopole Antenna, Afshin Panahi, Xiulong Bao, Kansheng Yang, Oisin O'Conchubhair, Max Ammann
Articles
A simple polarization reconfigurable printed monopole antenna is proposed for wireless applications. Conducting strips are used to connect to the ground plane providing the necessary additional modes for circular-polarization. Linear-polarization, right hand or left hand circular-polarization can be realized using only two PIN diodes, which connect to the ground plane, minimizing their effect on radiation characteristics. The mechanism is described, and key antenna parameters are studied and optimized. The antenna is prototyped and tested for all polarization configurations.
Design Method For Wideband Circularly Polarized Slot Antennas, Adam Narbudowicz, Matthias John, Vit Sipal, Xiulong Bao, Max Ammann
Design Method For Wideband Circularly Polarized Slot Antennas, Adam Narbudowicz, Matthias John, Vit Sipal, Xiulong Bao, Max Ammann
Articles
A compact ultrawideband (UWB) circularly polarized (CP) slot antenna is proposed with a methodology for automated reoptimization for packaging with proprietary devices. The slot structure employs a dual-feed with an integrated compact UWB phase shifter. The design process involves an advanced optimization algorithm and demonstrates the use of spline curves for generation of CP signals. These allow easy optimization, while preserving phase coherency across a wideband. The prototyped antennahas a CP bandwidth of 54% (from 3.2 to 6.1 GHz).
Folded Meander Line Antenna For Wireless M-Bus In The Vhf And Uhf Bands, Abraham Loutridis, Matthias John, Max Ammann
Folded Meander Line Antenna For Wireless M-Bus In The Vhf And Uhf Bands, Abraham Loutridis, Matthias John, Max Ammann
Articles
The first dual-band printed monopole antenna for Wireless M-Bus and M2M applications with operation in the VHF and lower UHF band is presented. The antenna operates at 169 MHz and 433 MHz. The miniaturisation of the proposed compact antenna is based on a double-sided meandering structure offering an easily controlled large frequency-ratio. The antenna provides high total efficiency and gain in both bands. Measured and simulated results are reported.
Omnidirectional Circularly Polarized Antennas – A Small Antenna Perspective, Adam Narbudowicz, Max Ammann
Omnidirectional Circularly Polarized Antennas – A Small Antenna Perspective, Adam Narbudowicz, Max Ammann
Articles
The paper discusses recent developments and challenges in the design of small omnidirectional
circularly-polarized (CP) antennas. Although omnidirectional CP coverage is easily achievable using antenna arrays, it is just recently that small and low-cost antennas delivered this functionality.
The paper addresses practical design problems for these antennas, not reported in previous publications.
This includes selection of the omnidirectional plane relative to the ground plane and measurement challenges. Future perspectives on how these antennas can provide electronically steerable beams are investigated using simulated results.
A Dual Band Lte Pifa Antenna For M2m Applications, Abraham Loutridis, Matthias John, Max Ammann
A Dual Band Lte Pifa Antenna For M2m Applications, Abraham Loutridis, Matthias John, Max Ammann
Articles
A dual Planar Inverted-F-Antenna for M2M applications, is proposed. The antenna covers the lower LTE band (690-960 MHz) and partially the upper LTE band (1670-2067 MHz). The antenna is low cost with omni-directional radiation characteristics. The measured total efficiency and gain are better than 58% and 0.8 dBi across the operational frequency range. A parametric study of key geometrical parameters is made.
A Printed Triangular Monopole With Wideband Circular Polarization, Afshin Panahi, Xiulong Bao, Giuseppe Ruvio, Max Ammann
A Printed Triangular Monopole With Wideband Circular Polarization, Afshin Panahi, Xiulong Bao, Giuseppe Ruvio, Max Ammann
Articles
A printed triangular monopole antenna with wideband circular polarization is presented. The wideband circular polarization is achieved by asymmetrical excitation of a triangular ground plane and planar triangular monopole. The combined radiation provides a wide axial-ratio bandwidth spanning from 1.42 to 2.7 GHz (62%). A parametric study of key geometric parameters is given for clear understanding of the radiation mechanism.