ANTENG APPENDIXsal041206

ANTENG APPENDIXsal041206 - 1 APPENDIX APPENDIX A Little Bit...

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Unformatted text preview: 1 APPENDIX APPENDIX A Little Bit of A Little Bit of Many Things Many Things ECE 5318/6352 ECE 5318/6352 Antenna Engineering Antenna Engineering Dr. Stuart Long Dr. Stuart Long 2 ¡ LOOP ANTENNAS LOOP ANTENNAS (Ch. 5) (Ch. 5) Small constant current loops UHF-TV λ << r Loops comparable to a wavelength 3 ¡ LOOP ANTENNAS LOOP ANTENNAS ( ) ( ) ' ' ' , , 4 dl R e z y x z y, x, jkR ' − ∫ = c I A π μ λ 1 . = C λ 5 = C 4 ¡ LOOP ANTENNAS LOOP ANTENNAS Ferrite-loaded multi-turn loops (AM radio) To increase antenna efficiency Increase circumference of loop or Insert a ferrite core within the circumference Multi-turn loop 5 ¡ LOOP ANTENNAS LOOP ANTENNAS C1 6 ¡ ARRAYS ARRAYS (Chs. 6 (Chs. 6 – 7 7 - 8) 8) Retro directive (Van Atta) Adaptive Arrays Signal processing Complex weighting Null adjusting 7 ¡ ARRAYS ARRAYS Distributions: Taylor, triangular, Continuous distributions Superdirectivity 2 cos cos, 8 ¡ ARRAYS ARRAYS Planar arrays Circular arrays 9 ¡ ARRAYS ARRAYS Dipole Self impedance ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − = = ' max 2 sin 2 z l k I J a I z z π ( ) ( ) ' ' 2 / 2 / ' 2 max , , 1 dz z z a E z z a I I Z z z m = = = = − = ∫ − ρ ρ A A 10 ¡ ARRAYS ARRAYS Dipole Mutual impedance Configuration of two identical elements Configuration of two identical elements...
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This note was uploaded on 09/09/2010 for the course ECE 4436 taught by Professor Staff during the Spring '08 term at University of Houston.

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ANTENG APPENDIXsal041206 - 1 APPENDIX APPENDIX A Little Bit...

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