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Recent content by alftel

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    CST and/or HFSS software to design LPDA

    I know this article (the one that you did show picture from) - we attempted to replicate this design in a past in order to see if it does work. I can tell you right now that design as it explained in this article just does not work and there is no way it would demonstrate S11 and SWR as claimed...
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    CST and/or HFSS software to design LPDA

    It should be designed with 250 MHz - 10 GHz coverage, possible use of bowtie dipoles as last elements to minimize size.
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    CST and/or HFSS software to design LPDA

    Hello guys (and gals), I wonder what it will take money wise to task any of you who owns or have an access to licensed CST and HFSS software to design, simulate/adjust Log Periodic Dipole Array (LPDA) antenna based on our specification, such as maximum size, Err and frequency range. We can...
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    Using filter(s) as RF splitter/combiner

    Thanks to everyone for valuable input! We will experiment with both - middle band single stage Wilkinson and will try 3-4 order Chebyshev calculated as 100/50 Ohm. It will be interesting to see how filters will perform - I probably will just cook up a small eval board.
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    Using filter(s) as RF splitter/combiner

    Hello my brothers in arms! I wonder if it is feasible to utilize filters instead of RF splitter/combiner and if anybody had this kind of experience in a past. As an example, assume that target application has intended frequency of operation as 1 GHz - 1.5 GHz and I can easily design LPF and/or...
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    RF Amplifier Power Limiter Stage

    Hello my brothers in arms! I do have a specific issue with RF amplifier that I developed for one of my users - it is a VLW (very low frequency) power amp that supposed to take as an input signal not exceeding 0dBm, otherwise output signal is distorted/saturated. User is going to use a variety...
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    Gold Plated vs Nickel Plated SMA connectors

    Hello, I am using high frequency (6GHz-8GHz rated) SMA connectors in my new design, and Digikey has exactly what I needed for 1.0mm PCB, but here is the thing - they have two suitable connectors manufactured by Taolgas and while they look the same from spec stand point, body finishing is...
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    Copper finishing for printed antenna

    I designed printed PCB antenna for dual-band WiFi application, and while initial FR4 and ENIG based design produced decent results I decided to take to the next level and try RO4003C material. Results are excellent, but since I choose (after a small research) silver immersion finishing I do face...
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    RF Amplifier impedance matching technique question

    LNA is Internally matched to 50 Ohms - Minicircuits GALI-39+ Forget about 0dB - will something like 0.1-0.2 dB attenuator with 50 Ohm impedance make any sense in this case? Will LNA "see" 50 Ohm regardless to mismatch beyond attenuator?
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    RF Amplifier impedance matching technique question

    So what you are saying is that this concept does not make any sense? It looks like is based on what I read here : Techniques for Improving Impedance Mismatch . I would be shy to use attenuation before LNA in my design. I guess better design and better cables will be the best approach. Thnaks to...
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    SMA pigtail cable and impedance measurements

    Thnaks a bunch to everyone for reply! Unfortunately my RF person is away together with equipment and AAI N1201SA indeed has nothing but a simple interface (such as Z, SVWR, S11, X), no Smith chart. The only thing that I attempted to compare was side-by-side cables from three different...
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    RF Amplifier impedance matching technique question

    Thanks Valker and FvM! The reason why I was thinking to implement 0dB attenuator is to present a perfect 50 Ohm matching component on both sides of LNA (Susumu part is 0dB and 50Ohm impedance on both sides with frequency range 0-10GHz). Ideas was as following: Am I wrong with this concept? I...
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    RF Amplifier impedance matching technique question

    We have design which includes LNA as an input point, and there is a possibility of impedance mismatch on both sides (RF input and load). One of the accepted techniques for impedance matching is to implement 50 Ohm attenuation. 1) Is it ok to implement 50 Ohm 0dB attenuator before input DC...
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    SMA pigtail cable and impedance measurements

    Need community opinion. We have a supplier in China (Voton Machinery, voton.net.cn or rf-connectors.com) who we used in a past to procure SMA and RP-SMA connectors. This time we required SMA pigtails with UFL connector. After receiving cables and attching them to our device we noticed some sort...
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    Engineer Finger Test

    I have RF design (three section Wilkinson splitter) that performs overall ok, but recently I acquired a small and very performant impedance and SWR measurement gadget that I am using not to test my antennas. I decided to try my splitter with this gadget, and to my surprise (it is 1:4 splitter...
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