These are good ideas -much appreciated.
Ref the term "dynamic range"...apologies if i have mis-used it...i am taking it as meaning the decibel difference between the peak of the pattern and the lowest point of the pattern.
Thanks for your reply,
The cables are phase matched. We used the VNA to compare the phases at the end of the cables and kept minutely adjusting cable lengths until we got a good phase match.
The pattern problem is worse at the highest frequency (17GHz).
I suspect the solder blobs must be...
Dear Engineers,
I have recently been pattern testing six separate dipole arrays in a remote part of Queensland. All these arrays are of the same design. The arrays are for use over 7 to 17GHz.
My problem is that strangely, different arrays have given different patterns. That is, some have...
Thanks guys, -I am certain that a cavity-backed spiral is basically the only antenna choice available to me.
-I need circular polarisation because I dont know what
polarity the incoming radio waves will be.
-Also I do need hemispherical coverage.
-Incoming radio waves could be anywhere over...
Ddear Engineers,
I am trying to design a planar circular spiral antenna with a certain (pretty wide) beamwidth.This will mean I have to sacrifice gain –however, I don’t know from what direction the radio waves will come from so I need the wide beamwidth.
The maths for a spiral seems easy. –One...
Dear Engineers,
Whilst pattern testing various antennas in a very remote part of Ireland, it has been noticed that the pattern often has a “glitch” on boresight (i.e. the glitch position corresponds to when the antennas are "peaking" to each other -pointing into each others boresight). The...
Hello Sir,
I would be very grateful if engineers could offer any explanations as to why I have found that the received_power versus frequency graph of “standard gain horns” is very jagged indeed. –It is not anything like a straight line (not even a curved line). –Rather, this graph is...
I am worried that I may be suffering from significant ground-reflections in my Antenna Patterns. -I am Pattern testing horn antennas at around 1GHz. The source horn has a fairly broad beamwidth. (so too do the Horn_Under_Test). I am Pattern Testing in my back garden in Rural Cumberland (very...
