Published May 30, 2006
From: Trevor Baker, Coffey
I need a device that can transmit and receive information data. This device would be installed inside a house but needs to be able to transmit multiple miles. Is there such a device? Would a relay point extend the transmittable distance? Can this device be integrated with a computer?
From: Panagiotis Mourtopallas, Student
I'm trying to find a book pertaining to the theory of injection locked oscillators. Could you provide any guidance? It's for my diploma thesis. Thank you.
Dear Panagiotis, The definitive paper on injection locking is "Injection Locking of Microwave Solid-State Oscillators" by K. Kurokawa, Proc. IEEE, Vol. 61, October 1973, pp. 1386-1410.
From: Jesse Sheinwald, The Aerospace Corp.
Years ago I designed waveguide systems utilizing 'choke' flanges. Today, I am faced with a new waveguide design problem and before I blindly use choke flanges I want a little more theoretical basis on how they work. Unfortunately, I have found little information in the literature. Do you know any good sources on the operation and effectiveness of choke waveguide flanges?
From: Paul Calvert, Radiance
Is it possible to encode radar waveforms at X-band in such a way that: At the (bi-static) receiver they can be mixed down to IF, the IF be converted to digital, then match the filter to the data with a 'transformed' code? I don't see how I can match-filter an X-band signal (digitally due to A/D difficulties at 10 GHz), nor do I see how CMDA PN codes can be match-filtered in the analog realm. However, I am thinking codes can be chosen at X-band such that once mixed down to IF, coding will still be present, although perhaps a radically different code than the original. Or am I missing something? I'm totally new to the RF/radar world, so please excuse any 'obvious' questions.
From: Tan HB, NTU
I am interested in passive component design for microwave communication systems. I have some rough ideas of designing a Lange coupler. How do I optimize a 3 dB 90 degree Lange coupler to achieve a broadband design?
From: Rajendran N S, United Microwaves P Ltd.
In a 1 GHz monopulse Rx, with a required bandwidth of 10 MHz, I have low noise amplifiers and filters meeting the required noise figure and selectivity. Why do I have to go superheterodyne, when the current log amplifers go well beyond 1 GHz?
Dear N S,
From: Rupreet S., EIL
In your opinion, what are the best book(s) for understanding RF and microwave basics?
From: Matthew Hathaway
I am relatively new to the field of microwave technologies. Could you suggest a good list of available references for self-study?
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.