Sband Patch Antenna Design for CINEMA Chungju Kim

S-band Patch Antenna Design for CINEMA Chungju Kim kimcj@khu. ac. kr Wireless Lab. , University Kyung Hee University Wireless Technology Lab. , Technology Kyung Hee

Design Goal - S-Band Patch Antenna Size 80 X 80 mm Bandwidth 60 MHz (2. 185~2. 245 GHz) Antenna Polarization Right Hand Circular Polarization (RHCP) RHCP Gain Over 5 d. Bic Axial Ratio Below 3 d. B Wireless Technology Lab. , Kyung Hee University

Antenna Polarization(1) - What is the Antenna Polarization The polarization of an antenna is the direction of the electric field (E-plane) of the radio wave with respect to the Earth's surface and is determined by the physical structure of the antenna and by its direction. Vertical Polarization Horizontal Polarization LH Circular Polarization Wireless Technology Lab. , Kyung Hee University RH Circular Polarization

Antenna Polarization(2) - Why use the CP antenna for CINEMA? Space communication has forced the use of Circular polarization. The fundamental advantage of circular polarization is that all reflections change the direction of polarization, precluding the usual addition or subtraction of main and reflected signals. Therefore there is far less fading and flutter when circular polarization is used at each end of the link. Wireless Technology Lab. , Kyung Hee University

Antenna Polarization(3) Wireless Technology Lab. , Kyung Hee University

Rectangular Patch antenna(1) - Geometry Wireless Technology Lab. , Kyung Hee University

Rectangular Patch antenna(2) - S-parameter - Bandwidth(-10 d. B) EM Meas. 69 MHz (2. 187~2. 256 GHz) 130 MHz (2. 119~2. 249 GHz) Wireless Technology Lab. , Kyung Hee University

Rectangular Patch antenna(3) - Axial Ratio(Meas. ) <xz-plane> <yz-plane> - Axial Ratio below the 3 d. B xz-plane 24 MHz (2. 145~2. 169 GHz) yz-plane 21 MHz (2. 155~2. 176 GHz) Wireless Technology Lab. , Kyung Hee University

Rectangular Patch antenna(4) - Radiation Pattern(Meas. ) <xz-plane> - Max. CP Gain at 2. 160 GHz <yz-plane> - Max. CP Gain at 2. 160 GHz RHCP Gain 6. 056 d. Bic RHCP Gain 5. 94 d. Bic LHCP Gain -14. 03 d. Bic LHCP Gain -12. 52 d. Bic Wireless Technology Lab. , Kyung Hee University

Double layer Patch antenna(1) - Geometry <First Layer> <Second Layer> Wireless Technology Lab. , Kyung Hee University

Double layer Patch antenna(2) - S-parameter - Bandwidth(-10 d. B) EM Meas. 71. 2 MHz (2. 164~2. 236 GHz) 123. 8 MHz (2. 131~2. 254 GHz) Wireless Technology Lab. , Kyung Hee University

Double layer Patch antenna(3) - Axial Ratio(Meas. ) <xz-plane> <yz-plane> - Axial Ratio below the 3 d. B xz-plane Out of range yz-plane Out of range Wireless Technology Lab. , Kyung Hee University

Double layer Patch antenna(4) - Radiation Pattern(Meas. ) <xz-plane> - Max. CP Gain at 2. 205 GHz <yz-plane> - Max. CP Gain at 2. 205 GHz RHCP Gain 6. 447 d. Bic RHCP Gain 6. 273 d. Bic LHCP Gain -1. 931 d. Bic LHCP Gain -8. 186 d. Bic Wireless Technology Lab. , Kyung Hee University

Double-fed Patch antenna(1) - Geometry <First Layer> <Second Layer> Wireless Technology Lab. , Kyung Hee University

Double-fed Patch antenna(2) - S-parameter(EM Simulation) - Bandwidth(-10 d. B) EM 70 MHz (2. 19~2. 26 GHz) Wireless Technology Lab. , Kyung Hee University

Double-fed Patch antenna(3) - Radiation Pattern(EM Simulation) <xz-plane> - Max. CP Gain at 2. 2 GHz <yz-plane> - Max. CP Gain at 2. 2 GHz RHCP Gain 7. 49 d. Bic LHCP Gain -13. 542 d. Bic Wireless Technology Lab. , Kyung Hee University

SUMMARY Rectangular Patch Double layer Patch Double-fed Patch Antenna EM Meas. EM 2. 211 2. 184 2. 20 2. 192 2. 225 GHz GHz GHz Reflection coefficient 69 130 71. 2 123. 8 bandwidth MHz MHz Polarization type RHCP 7. 26 d. Bic 6. 00 d. Bic 1. 52 d. B Center Frequency Circular Polarization Gain Minimum Axial Ratio (Frequency) Meas. - 70 MHz - RHCP - 7. 45 d. Bic 6. 36 d. Bic 7. 49 d. Bic - 1. 73 d. B 0. 932 d. B 3. 34 d. B 0. 82 (2. 215 (2. 16 (2. 215 (2. 205 (2. 2 GHz) GHz) - Wireless Technology Lab. , Kyung Hee University