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Type: Posts; User: alftel

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  1. Closed: Re: NFC Antenna Design to radiate strong field strength

    I am not exactly "expert" in this field, but I would try a few protoypes based on PCB design. The good starting point will be AN2866 application note from ST Microelectronics "How to design a 13.56...
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    Closed: Re: Toothed log periodic antenna design

    I designed a dual-band LPA such as it formed two segments - one for 2.4-2.5 GHz and another 5.0 - 6.0 GHz with average gain of >8dBi. It was tested by Kent Britain ( http://www.wa5vjb.com/ ) and yhou...
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    Closed: Re: Functionl Generator 600 MHz

    You may take a look how to utilize SDR as a signal generator - see the following as an example - https://www.rtl-sdr.com/tag/signal-generator/
  4. Closed: SignalHound SA124B and SG124A for RF Testing

    I was looking at affordable yet a good quality spectrum analyzer with tracking generator that can perform in 0.4 - 6.0 GHz range and has a decent ability to produce reports and graphs. After a...
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    Closed: Re: 12-way resistive splitter layout

    Thanks Volker! Danke Schön! I didn't know that vias and their respective spacing contribute to this calculation - always learn something.... I am a dumb person more or less when it comes to topics...
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    Closed: Re: 12-way resistive splitter layout

    Fantastic! The only thing that hunts me is that any CPWG Ground calculator that I punch this data in does not produce 50 Ohm impedance (i.e. 0.51mm substrate height, 0.65mm trace width, 0.15mm gap,...
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    Closed: Re: 12-way resistive splitter layout

    On the other hand, I just had a lengthy chat with my "RF reference" Kent Britain, and he reminded me that FR4 has 4.6 Err measured (usually) at 100 MHz, and at 6GHz it is more likely 3.8-3.9. When we...
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    Closed: Re: 12-way resistive splitter layout

    Thanks a lot again Volker! I guess data is good enough to try it on PCB (I am looking at https://www.edn.com/electronics-blogs/all-aboard-/4430355/How-much-return-loss-is-too-much--Rule-of-Thumb--12...
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    Closed: Re: 12-way resistive splitter layout

    Volker - it's awsome! Thanks a LOT! To my humble opinion charts looks fantastic - I didn't expect them to be that good. It will be interesting to see these charts up-to 6GHz where looks like the most...
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    Closed: Re: High gain wideband antenna

    Anil, thnaks a lot for pointing at your book! Great source. Not attempting to hijack this thread, but I glanced at book content through Google view in hope to find prescriptive formulas for printed...
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    Closed: Re: 12-way resistive splitter layout

    Here is gerbers archive, Saturn PCB screenshot, and TXLine screenshot. PCB is FR4, 0.6mm, two layer, 1oz copper, traces 0.65mm, gap 0.2mm, MMCX connectors rated 6GHZ and over. Dying to see simulation...
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    Closed: Re: 12-way resistive splitter layout

    Correct, it is FR4, 0.6mm, 2-layer. I will generate gerbers later today, and will post Saturn PCB output showing CPWG calculation. Thanks a bunch for offering help! It will be really cool to see what...
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    Closed: Re: 12-way resistive splitter layout

    Unfortunately I do not have simulation soft at my disposal - it will be nice indeed to simulate it first and see what simulated results will be. The only thing that I can do is to create a PCB,...
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    Closed: Re: 12-way resistive splitter layout

    Something like this - 0402 resistors, 0.6mm two layer PCB (FR4), 1oz copper, 0.65mm traces, 0.2mm gap for CPWG, MMCX connectors. Should it be ok for 2GHz - 6GHz, I guess?

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    Closed: Re: 12-way resistive splitter layout

    How this one looks like for 1:8 resistive splitter (with 0402 "merge" and MMCX connectors). Of course it will be CPWG with ground stitching in a final. Any opinion/advice?

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    Closed: Re: 12-way resistive splitter layout

    Thanks a lot Volker for the article reference - I remember seeing it a while ago (didn't save it though - now I will) and concluded that 0201 packaging should work fine at 6GHz. I will try to layout...
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    Closed: Re: 12-way resistive splitter layout

    "Merging" resistors is an interesting idea - didn't think about it. l will certainly try this approach and will report results - shouldn't take a long time to implement the prototype. Thanks! Which...
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    Closed: Re: 12-way resistive splitter layout

    Cascaded design is exactly what I did for 1:8 splitter (similar to shown by Volker), but as I noted above, it was not a start configuration, but cascaded one. This approach gives 6dB port-to-port...
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    Closed: Re: 12-way resistive splitter layout

    Low power (1W will be more then sufficient), just a resistive splitter. We already tested 2-way and 3-way that I designed myself (402 package resistors), and they perform as expected (well, minus...
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    Closed: Re: High gain wideband antenna

    Designing a good quality antenna is a challenge by itself, an before diving into formulas/calculations and articles I would take a look at what is available (and inexpensive). Take a look at what...
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    Closed: 12-way resistive splitter layout

    I know that this topic was discussed somewhat in a past, but here is a challenge that I am facing right now - I am in a need to design 12-way RF resistive splitter for 2GHz - 6GHz band. In a recent...
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