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Ahhh ...yes, that makes sense. I hadn't thought of that at all. "Thieving" ... got it! Thanks very much.
Yes, my designs have caused consternation too, just like you've experienced, but with a decent process you can still get non-thermally-relieved things to "take" and the company hasn't gone...
Hello
For RF designs I have always specified a "solid" copper flood for ground and power planes, with sparing use of thermal reliefs if necessary (and avoided them for RF!).
However, I note that a lot of consumer/professional PCBs have planes like this:
**broken link removed**...
I'd certainly be interested to see screenshots and to hear how the instrument performs, and what it's like to use.
The problem with lower cost instruments *can* tend to be:
i - the sweep speed is usually quite slow - not easy to do real-time tuning of e.g. filters or antennas
ii - the dynamic...
I too evaluated an Aaronia spectrum analyser (RSA9000). It had more in common with a comb generator than any form of signal measuring instrument. It is without doubt the worst-performance instrument I have ever encountered. The dynamic range s unusable and it never achieves the sweep rate...
I've got some photographs of the insides: please also see this PDF which has some shots **broken link removed**
https://obrazki.elektroda.pl/5784763300_1460583643.jpg
https://obrazki.elektroda.pl/6018375600_1460583646.jpg
https://obrazki.elektroda.pl/6076684300_1460583647.jpg...
I own a Copper Mountain Technologies (CMT) TR1300/1 (website shows cost = $US2750) and it is superb. You can read all about its performance specs on their website, but see below for a summary. I have tested it against a mainframe HP VNA and it meets the same performance criteria and displays the...
Biff44 - thanks. It makes sense; I'm not sure why I couldn't understand my own thoughts, but I did indeed muddle myself up. Yes, considering the "journey" which a wavefront has to make from a source to a load then back again, it's a two-way transit time so the round-trip is two lots of...
The ADK does give several options for monopoles, not just planar: my approach would be to design a true monopole antenna at 3.4GHz comprising of a cylindrical or square cross-section rod protruding up from a ground plane which is several lambda in diameter. Once that is working I would then clad...
Allow me to add to Dave's excellent summary by mentioning 4NEC2 (a Win32 application) - a free front-end for NEC2 code, and also xnec2c which is linux GUI orientated, and finally nec2c which is a terminal linux application. All freeware.
Your best bet is to get hold of the Ansys website and download their Antenna Design Kit. It's a free download; in it you will find several worked examples and monopole antennas are included. You can then specify the antenna parameters (ground plane dimensions, centre frequency of 3.4GHz etc.)...
Hello
Short version: Please could someone explain how would I implement a phase offset to an existing s1p data file I have captured in order to effect a lambda/4 transformation for every data point? Do I just add "90" to the "degrees" column?
background: I've measured the input Z of a...
Hello
I would like to do finite element analysis of an air-cored solenoid - the coil's diameter is approx 100mm, its length (height) is approx. 500mm and it is wound to have a single layer of 1500 turns - copper wire is approx.0.3mm diameter. The length of conductor wound upon the cylinder...
Mark - thanks for the feedback. I'll scale the helix former's length and diameter and also scale the conductor length therein
Dave - agreed; the conductor diameter will tend to dominate antenna Joule losses and would best be left as large as possible.
What I should perhaps have mentioned is...
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