Pattern reconfigurable antenna designs insub-6 ghz band for 5g applications

Çelik, Feza Turgay
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 process. Designed antenna has a shorting plane located at its middle section. This shorting planedividesthe antenna into two sub-elementsthat are independent ofeach other.As each sub-element has its own excitationport, it is possibleto scan the main radiation direction of the antenna by applying phase differences between the ports. Designed antennascans from-400to +400in the elevation plane, which is orthogonal to shorting plane.Another printed antenna is designed based on the excitation of different modes ofdifferent resonators.Circularpatch and ring-shaped resonators are employed to create different radiation patterns. The cavity model isusedto analyze and design radiators. The radiators are arranged so that they operate atdifferent modes of cavity model. The ring is fed by two ports opposite to each other while the circular patch is parasitically excited. The applied phase difference between ports determines which radiator is excited more dominantly. Designedantenna also performsbeam scanningfrom-400to +400in the elevation plane along the feeding ports.To miniaturize, the antenna is loaded by capacitors. Antenna is fabricated,and design is validated by measurements.Arectangular patch antennathat includes four triangular sub-antenna elements is designed. This antenna employs the parasitic elements to steer its radiation direction. However, the phenomenon that resultsin beam scanning isnot limited tothe contributions of the parasitic elements. As the antenna consists of four independently excitedelements, operation with multiple elements also effectivelysteer the radiation beam. This design is capable of steeringthe radiated beam from -400to +400in elevation plane.


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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...
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There are a number of different parallel arm feed topologies which give the same radiation pattern characteristics. On the of her hand, noise temperature and efficiency of those feed structures will possibly, be not the same. In this wort parallel arm feed structures are studied for their noise and efficiency performance using the noise equivalent line length method and an optimum number of antenna elements for a sub-array is obtained by comparing noise temperature and efficiencies of the structures.
Diversity performance of microstrip patch antennas placed on human body at ISM and MBAN frequencies
Ozturk, Mehmet Ali; Tamer, Ufuk; Yılmaz, Ali Özgür; Ozdemir, Tayfun; KAYA, İSMAİL (2017-03-18)
In this study, the diversity performance of microstrip patch antennas mounted on the chest and the back of a person is investigated in static and dynamic indoor environments at ISM (2.4-2.5 GHz) and medical body area network (2.36-2.4 GHz) bands. Power received by the radios worn by the person while standing and walking is recorded and compared. In addition, antennas are simulated on a human body to study the effect of the human body. The work was done as part of a remote patient monitoring project, and hen...
Three Dimensional Microfabricated Broadband Patch and Multifunction Reconfigurable Antennae for 60 GHz Applications
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In this paper we present two antenna designs capable of covering the IEEE 802.11ad (WiGig) frequency band (57-66 GHz and 59-66 GHz respectively). The work below reports the design, microfabrication and characterization of a broadband patch antenna along with the design and microfabrication of multifunction reconfigurable antenna (MRA) in its static form excluding active switching. The first design is a patch antenna where the energy is coupled with a conductor-backed (CB) coplanar waveguide (CPW)-fed loop s...
HF spectrum occupancy and antennas
Casimiro, Antonio; Azevedo, Joaquim; Economou, Lefteris; Haralambous, Haris; Tulunay, Ersin; Tulunay, Yurdanur; Bahadirlar, Yildirim; Turk, A. Serdar; Warrington, E. Michael (2009-06-01)
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.
Citation Formats
F. T. Çelik, “Pattern reconfigurable antenna designs insub-6 ghz band for 5g applications,” M.S. - Master of Science, Middle East Technical University, 2021.