Microwave Heating Pattern Beamforming Using Cylindrical Phased-Array of Antennas ıa 1 Adriana P´ erez Garc´ omez Tornero 2 o Cabrera 3 Jos´ e Luis G´ Juan Monz´ 1 Telecommunication Engineering Student(UPCT) 2 Information and Communication Technology Department (UPCT) 3 General Director of Universities in Murcia 28 July 2016 widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 1 / 25
Content Introduction 1 Proposed System 2 Cylindrical Microwave Oven with Cylindrical Sample Coaxial Monopole Antenna S parameters Simulation Structure Results 3 A single antenna Combination of Antennas Conclusions 4 References 5 widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 2 / 25
Introduction Introduction 1 Proposed System 2 Cylindrical Microwave Oven with Cylindrical Sample Coaxial Monopole Antenna S parameters Simulation Structure Results 3 A single antenna Combination of Antennas Conclusions 4 References 5 widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 3 / 25
Introduction Synthesis of heating patters is still a challenging objetive. Uniform heating or the creation of heating patterns is a desirable capability of any modern microwave heating system.[8] Phased-Array of Antennas has been proposed to synthesize near-field focused patterns by exciting each radiator amplitude and phase.[2]-[3] Leaky-wave antennas (LWAs) are a promising radiator technology to consider in future. Simulation tools as CAD software CST and MATLAB have been used to obtain this results. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 4 / 25
Introduction Synthesis of heating patters is still a challenging objetive. Uniform heating or the creation of heating patterns is a desirable capability of any modern microwave heating system.[8] Phased-Array of Antennas has been proposed to synthesize near-field focused patterns by exciting each radiator amplitude and phase.[2]-[3] Leaky-wave antennas (LWAs) are a promising radiator technology to consider in future. Simulation tools as CAD software CST and MATLAB have been used to obtain this results. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 4 / 25
Introduction Synthesis of heating patters is still a challenging objetive. Uniform heating or the creation of heating patterns is a desirable capability of any modern microwave heating system.[8] Phased-Array of Antennas has been proposed to synthesize near-field focused patterns by exciting each radiator amplitude and phase.[2]-[3] Leaky-wave antennas (LWAs) are a promising radiator technology to consider in future. Simulation tools as CAD software CST and MATLAB have been used to obtain this results. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 4 / 25
Introduction Synthesis of heating patters is still a challenging objetive. Uniform heating or the creation of heating patterns is a desirable capability of any modern microwave heating system.[8] Phased-Array of Antennas has been proposed to synthesize near-field focused patterns by exciting each radiator amplitude and phase.[2]-[3] Leaky-wave antennas (LWAs) are a promising radiator technology to consider in future. Simulation tools as CAD software CST and MATLAB have been used to obtain this results. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 4 / 25
Introduction Synthesis of heating patters is still a challenging objetive. Uniform heating or the creation of heating patterns is a desirable capability of any modern microwave heating system.[8] Phased-Array of Antennas has been proposed to synthesize near-field focused patterns by exciting each radiator amplitude and phase.[2]-[3] Leaky-wave antennas (LWAs) are a promising radiator technology to consider in future. Simulation tools as CAD software CST and MATLAB have been used to obtain this results. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 4 / 25
Proposed System Introduction 1 Proposed System 2 Cylindrical Microwave Oven with Cylindrical Sample Coaxial Monopole Antenna S parameters Simulation Structure Results 3 A single antenna Combination of Antennas Conclusions 4 References 5 widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 5 / 25
Cylindrical Microwave Oven with Cylindrical Sample Figura: Cylindrical cavity and cylindrical wet-clay sample. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 6 / 25
Cylindrical Microwave Oven D OVEN = 65.12 cm H OVEN = 6.17 cm f 0 =2.45 GHz. Resonance Frequency in Microwave Heating . . Figura: Cylindrical metallic cavity. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 7 / 25
Cylindrical Sample D SAMPLE = 10 cm H SAMPLE = 2 cm Wet Clay ε r = 30 ′′ ε r = 5 tg δ = 5 30 = 1 6 = 0 , 16 Figura: Cylindrical wet clay sample. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 8 / 25
Coaxial Monopole Antenna A standard BNC connector determines the coaxial feeding size. D COAX = 2 cm d COAX = 0.2 cm ε r COAX = 1 H COAX = 1.265 cm H DOWN = 1.065 cm H MONOPOLE = 0.2 cm d MONOPOLE = 3.56 cm Figura: Coaxial Antenna. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 9 / 25
S parameters Input matching of a single monopole antenna inside the cavity + sample. H MONOPOLE and d MONOPOLE have been optimized. No coupling can occur with other antennas’s waveports. Return losses below -60dB. Good coupling to the cavity and efficient transfer of energy to the lossy sample. Figura: S parameters widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 10 / 25
Simulation Structure Figura: CST simulation structure. Figura: Matlab Structure. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 11 / 25
Results Introduction 1 Proposed System 2 Cylindrical Microwave Oven with Cylindrical Sample Coaxial Monopole Antenna S parameters Simulation Structure Results 3 A single antenna Combination of Antennas Conclusions 4 References 5 widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 12 / 25
Results 1 The electric fields created by each antenna is obtained with CST, and extracted to be processed with MATLAB. 2 The z-component of the electric field propagates and reaches the sample. 3 Using the following equation [8], the power loss inside the sample can be computed. Power Loss Density Equation ′′ r ε 0 | E z SAMPLE ( x , y ) | 2 P LOSS ( x , y ) = ωε (4.1) widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 13 / 25
Results 1 The electric fields created by each antenna is obtained with CST, and extracted to be processed with MATLAB. 2 The z-component of the electric field propagates and reaches the sample. 3 Using the following equation [8], the power loss inside the sample can be computed. Power Loss Density Equation ′′ r ε 0 | E z SAMPLE ( x , y ) | 2 P LOSS ( x , y ) = ωε (4.1) widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 13 / 25
Results. A single Antenna NOTE The results obtained with CST and MATLAB are almost identical. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 14 / 25
Results. A single Antenna Example Comparison of the power loss density in Antenna1 with CST and Matlab. Figura: P LOSS in Antenna 1 with Figura: P LOSS in Antenna 1 with CST. MATLAB. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 14 / 25
Results. A single Antenna NOTE The results obtained with CST and MATLAB are almost identical. (a) Transverse E-Field E t (b) Normal E-Field E z (c) Power Loss Density in the region of sample Figura: Field intensity pattern when only antenna 1 is excited. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 14 / 25
Results. A single Antenna (a) Antenna 2 position (b) Antenna 8 position (c) Antenna 12 position (d) Antenna 2 (e) Antenna 8 (f) Antenna 12 Figura: Normalized Power Loss pattern obtained when exciting different antennas. widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 15 / 25
Results. A single Antenna Example Different heating spatial distributions inside the sample are obtained due to rotation created by the azimuthal symmetry of the antennas location, and the oven and sample cylindrical shapes. (a) Antenna 1 (b) Antenna 8 widthwidth A. P´ erez, J.L. Tornero, J. Monz´ o (UPCT) 3GCMEA Cartagena(Spain),25-29 July 15 / 25 Figura: Comparison between Antenna 1 and Antenna 8.
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