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I'm trying to stretch the desing to the limit 20%BW. My freqs are inside the 200-400 Mhz band. Any suggestion to stretching the limit on patch BW?? again thanks, f

Thanks Higgler, Will do.. Frank

I'm looking to design a sysetm that will let me feed four patch antennas out of phase. First one, 0 degress, then 90 degrees, 180 and 270 degrees. Question is where can i find a design for a rat-race type hybrid, OR is there a way i can use a number of hybrids to accompolish this? Power is 20...

Thanks. I'll look into it. Last question: what if i need a material that has to make a close fit and actually touch the elements like a vaccum sealed bag? Any suggestions? Thx again, Frank

Does anyone know of a material such as cotton or nylon type, that i can place an antenna inside of without degrading the antennas performance? Ideally, i'd like to create a waterproof bag to place an antenna inside? Thanks in advance,

Thanks for the web link. I looking into a vector network analyzer now. Probably a bit easier. Frank

I have an older HP-8711B Network Analyzer and am trying to plot the output data into a smith chart for matching. The problem is this analyzer does not provide polar coordinates. How can i use the data from my analyzer (either LogMag/LinMag/SWR) to plot on a smith chart?? Thank you. Frank

logbook, thanks for help really appreaciate it. I did call HP about the analyzer and they let me know its one of thier lower-end models. Again much appreaciated. best regards, Frank

Logbook, sorry for the confusion. I applied voltage to both amplifiers (30dB gain each) for a total of 60 db (with an input signal of -80dBm). Its then when the noise floor jumps up. I was told that this may be a function of the video resolution BW on my signal generator also, and i'm going to...

I have cascaded two LNA's and when i apply voltage to both amplifers the floor on my spectrum analyzer increases 20dB to about (-50dB). When i apply voltage to just one amplifer, the specturm analyzer's noise floor(?) stays at (-75dB). Is that normal? or a product of the cascaded amplifer...

FriendlyBen, Can you tell me about your progress on the 433 MHz antenna. Did you get a working design with good gain? Thx.. f