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Published June 7, 2006
From: Devendra Chitguppa, BEL Bangalore
What is the relation between CW (unmodulated carrier power) and modulated carrier power in the case of BPSK, QPSK, 16QAM, 32QAM, 64QAM, 128QAM and 256QAM?
From: Jean Almira, Eudyna Devices Asia
My inquiry is regarding balun design. In the papers I've read, they often mention power dividers/combiners at the same time. However, I'm not sure what the relation is between a balun and power divider. How does one relate to both issues? What are the similarities or differences between the two?
From: Maria Siddiqua
I am desiging a passive crossover using ADS software. I did it by cascading two 90 degree hybrids. According to theory, the signal applied at port 1 should appear diagonally at the output port, but I am not sure about the phase. Should there be any phase difference between i/p and o/p? What should the phase difference be between the o/p ports?
From: Ramaraju Biruduraju, HELA
We have been trying to realize an SP6T switch using one SPDT and two SP3T MMIC switches in the frequency range from 6 to 18 GHz. The combined insertion loss is coming out to be about 6 dB, which is very expensive for us. Could you suggest a direct SP6T switch in a MMIC version, if available?
From: Gao Wei, the University of Electronics and Technology of China
What kind of antenna should I utilize for a unit of array operating at better than 35 GHz? Could you direct me to any references regarding this topic?
From: Manoj Das, Student
How does the driver for operating the PIN diode switch work?
From: Joseph Moreno, University of Glamorgan - School of Electronics
I am an MSc student in mobile communications and currently researching some information regarding beam steering systems for mobile phones (3G and 4G) as well as wireless LAN applications. Could you assist me with some references?
Harlan Howe, Jr. received his BS degree in optics from the University of Rochester in 1957. He has been actively engaged in the microwave industry for 48 years, first as a design engineer and then as an engineering manager. In 1990 he became the publisher/editor of Microwave Journal. He retired as publisher in 2001, but remains the editor. He is a Life Fellow of IEEE, past president of MTT-S and the recipient of an IEEE Third Millennium Medal in 2000 and the MTT-S Distinguished Service Award in 2005.
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