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

2. Wireless Technology Lab., Kyung Hee University Design Goal -S-Band Patch Antenna Size80 X 80 mm Bandwidth60 MHz (2.185~2.245 GHz) Antenna Polarization Right Hand Circular Polarization (RHCP) RHCP GainOver 5 dB ic Axial RatioBelow 3 dB

3. 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 RH Circular Polarization

4. Wireless Technology Lab., Kyung Hee University 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.

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

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

7. Wireless Technology Lab., Kyung Hee University Rectangular Patch antenna(2) -S-parameter - Bandwidth(-10 dB) EM69 MHz (2.187~2.256 GHz) Meas.130 MHz (2.119~2.249 GHz)

8. Wireless Technology Lab., Kyung Hee University Rectangular Patch antenna(3) -Axial Ratio(Meas.) xz-plane24 MHz (2.145~2.169 GHz) yz-plane21 MHz (2.155~2.176 GHz) - Axial Ratio below the 3 dB

9. Wireless Technology Lab., Kyung Hee University Rectangular Patch antenna(4) -Radiation Pattern(Meas.) RHCP Gain6.056 dB ic LHCP Gain-14.03 dB ic - Max. CP Gain at 2.160 GHz RHCP Gain5.94 dB ic LHCP Gain-12.52 dB ic - Max. CP Gain at 2.160 GHz

10. Wireless Technology Lab., Kyung Hee University Double layer Patch antenna(1) -Geometry

11. Wireless Technology Lab., Kyung Hee University -S-parameter Double layer Patch antenna(2) - Bandwidth(-10 dB) EM71.2 MHz (2.164~2.236 GHz) Meas.123.8 MHz (2.131~2.254 GHz)

12. Wireless Technology Lab., Kyung Hee University Double layer Patch antenna(3) -Axial Ratio(Meas.) xz-planeOut of range yz-planeOut of range - Axial Ratio below the 3 dB

13. Wireless Technology Lab., Kyung Hee University Double layer Patch antenna(4) -Radiation Pattern(Meas.) RHCP Gain6.447 dB ic LHCP Gain-1.931 dB ic - Max. CP Gain at 2.205 GHz RHCP Gain6.273 dB ic LHCP Gain-8.186 dB ic - Max. CP Gain at 2.205 GHz

14. Wireless Technology Lab., Kyung Hee University Double-fed Patch antenna(1) -Geometry

15. Wireless Technology Lab., Kyung Hee University -S-parameter(EM Simulation) Double-fed Patch antenna(2) - Bandwidth(-10 dB) EM70 MHz (2.19~2.26 GHz)

16. Wireless Technology Lab., Kyung Hee University Double-fed Patch antenna(3) -Radiation Pattern(EM Simulation) RHCP Gain7.49 dB ic LHCP Gain-13.542 dB ic - Max. CP Gain at 2.2 GHz RHCP Gain7.49 dB ic LHCP Gain-13.542 dB ic - Max. CP Gain at 2.2 GHz

17. Wireless Technology Lab., Kyung Hee University SUMMARY Rectangular Patch Antenna Double layer Patch Antenna Double-fed Patch Antenna EMMeas.EMMeas.EMMeas. Center Frequency 2.211 GHz 2.184 GHz 2.20 GHz 2.192 GHz 2.225 GHz - Reflection coefficient bandwidth 69 MHz 130 MHz 71.2 MHz 123.8 MHz 70MHz- Polarization type RHCP - Circular Polarization Gain 7.26dB ic 6.00dB ic 7.45dB ic 6.36dB ic 7.49dB ic - Minimum Axial Ratio (Frequency) 1.52dB (2.215 GHz) 1.73dB (2.16 GHz) 0.932dB (2.215 GHz) 3.34dB (2.205 GHz) 0.82 (2.2 GHz) -