HF spectrum occupancy and antennas

2009-06-01
Casimiro, Antonio
Azevedo, Joaquim
Economou, Lefteris
Haralambous, Haris
Tulunay, Ersin
Tulunay, Yurdanur
Bahadirlar, Yildirim
Turk, A. Serdar
Warrington, E. Michael
This paper deals with the research made during the COST 296 action in the WG2, WP 2.3 in the antennas and HF spectrum management fields, focusing the Mitigation of Ionospheric Effects on Radio Systems as the subject of this COST action.
ANNALS OF GEOPHYSICS

Suggestions

Pattern reconfigurable antenna designs insub-6 ghz band for 5g applications
Çelik, Feza Turgay; Aydın Çivi, Hatice Özlem; Alatan, Lale; Department of Aerospace Engineering (2021-2-08)
In this thesis, design,simulations,fabrication, and radiation pattern measurementsof reconfigurable antennas for sub-6GHz application of 5G protocol are presented. Modeanalysis techniquesand array theory areemployed to have anunderstanding ofthe pattern reconfigurability conceptof the designs.As a first step, adual-fed rectangular patch antenna is designed,simulated,fabricated,and then measured. Even and odd mode definitions onthe rectangular patch antennas are employed in the design pr...
Theoretical investigation and design of wideband dielectric resonator antennas
Yüksel, Yılmaz Çağrı; Alatan, Lale; Department of Electrical and Electronics Engineering (2015)
The aim of this thesis is to utilize Dielectric Resonator Antennas (DRA) as array elements due to their advantages over other conventional antenna elements such as dipoles and microstrip patches. Depending on both the excitation mechanisms and the antenna shape, a Dielectric Resonator Antenna (DRA) provides its designer multiple independent degrees of freedom. In this thesis three antenna shapes, namely hemispherical, cylindrical and rectangular DRAs, are investigated. The cylindrical and the rectangular sh...
Development of multiband microstrip antennas for GPS applications
Önder, Mustafa Caner; Aydın Çivi, Hatice Özlem; Department of Electrical and Electronics Engineering (2019)
In this thesis study, the design, fabrication and measurements of dualband and triband circularly polarized microstrip antennas for GPS applications are presented. Characteristic mode analysis technique is applied to get an insight into circularly polarized patch antennas. A design flow is presented for a circularly polarized L1 GPS band microstrip antenna by using characteristic mode analysis. A single fed L1/L2 GPS band right hand circularly polarized four-slotted patch antenna is designed by using reacti...
Beam Steerable Traveling Wave Meander Line Antenna Using Varactor Diode for X-Band Applications
Gokalp, Nihan; Aydın Çivi, Hatice Özlem (2008-07-11)
This paper presents a novel beam steerable meander line antenna with varactor diode for X-band applications. Beam steering has been achieved by loading the arms of the meander line antenna with varactor diodes. The capacitances of the varactor diodes have been controlled by DC bias voltage. Instead of varactor diodes, RF-MEMS variable capacitances can be used to scan the beam. Since the insertion loss of MEMS capacitances are small compared to loss of varactor diodes, use of MEMS capacitors will increase th...
Dual frequency bi-orthogonally polarized antenna for GPS applications
Alatan, Lale; Mahale, A; Balasubramanian, A; Olin, RP (2000-01-01)
Design, fabrication and testing of dual frequency bi-orthogonally polarized microstrip patch antenna structures for GPS receivers are studied. The considered configurations include orthogonally placed coplanar rectangular patches, orthogonally stacked rectangular patches and stacked square patches. Designed antennas are fabricated according to the optimized parameters, tuned in the presence of radomes and then measured for their bandwidth, input matching, radiation pattern, gain, and polarization characteri...
Citation Formats
A. Casimiro et al., “HF spectrum occupancy and antennas,” ANNALS OF GEOPHYSICS, pp. 339–357, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52972.