Questions tagged [rf]
Short for Radio Frequency, i.e. frequencies at which radiation (intentional or not) plays a role. Typically associated with wireless communications, but also relevant for high-speed PCB design.
4,259 questions
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How does this anti-theft antenna/reflector device work
The foil in the image below is, I think, an anti theft device inside a cheap clothing tag at a retailer.
[image: snapshot of purchased product, own work]
Wondering how it works (reflects? resonates? ...
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High speed communication data link system [closed]
I need a high-speed (150~200Mbps) wireless digital communication design.
I was thinking about something like this (shown for the TX):
data -> FPGA -> RF transceiver -> PA -> ANT
I choose ...
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Sweep Generator Design [duplicate]
How do I design a wideband (>100 MHz) sweep frequency generator in UHF frequency range? I'm working on PLL frequency synthesizer incorporating a VCO, programmable divider, PFD and loop filter. I've ...
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How to control three battery-powered LED strings and two LED candles with one remote (very small 433 MHz receivers needed) [closed]
I want to control several small decorative lights in my room with one single remote.
I have:
three battery-powered LED string lights (each uses 2×AA batteries, on/off slide switch)
two small LED ...
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Advice needed: Low-power mobile uplink detection system design (RF beginner) [closed]
For a university project, I am trying to design a system capable of locating uplink signals emitted by mobile phones.
The Constraints: I need to scan different frequency bands corresponding to various ...
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Can a magnetic loop antenna be used to communicate through a perfect metal container?
I understand that in the near field of a loop antenna the magnetic field dominates, before it has formed a radiative propagating EM wave. Based on this, and the fact that magnetic fields can penetrate ...
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Looking for Feedback on My 4-Layer PCB Design With Chip Antenna (Screenshots Attached)
I'm working on a 4-layer PCB that uses this 2.4 GHz chip antenna, and I'd appreciate some expert opinions or comments on the layout. This board will be used for Wi-Fi/BLE, and I want to ensure good RF ...
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Advice on S Band RF GaN transistor with MWO libraries
I'm designing a microwave class F power amplifier, and I'd need a transistor in the 2.7-2.9 GHz range with at least 10 dB gain (16 dB would be ideal, but feel free to advice anything above that ...
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SMA Edge Mount Connector Placement
I would like to measure the input/output impedance of some circuits from 1 MHz-200 MHz using a nanoVNA.
PCB stackup is Sig/GND/GND/+5V, Sig does not have a ground pour on the same layer.
Trace width ...
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Modeling RF Impedance Matching PCB Geometry
I am designing RF amplifiers, and I often use LDMOS transistors with unmatched inputs and outputs. My goal is to learn how to model and simulate PCB impedance-matching geometry on a computer before ...
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How to layout a transmission line for impedance matching when using a chip antenna
I will be designing a PCB layout for a LoRa module very similar to this one, but with a chip antenna instead of a U.FL connector.
It seems that this one has a pi matching network for matching the ...
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433.92 TX 12V Prototype Review
I have been using 433 RF TX ICs that work well at 3.3V however I wanted to try and test out a 12v 433 TX circuit. Only digital AM ASK/OOK used.
I'm running my circuit on a LiPo battery so I though the ...
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Choice of PCB Material for HF RF circuit
I am currently designing an FM Radio (88MHz - 108MHz) and have gotten to a point in the design where I am beginning the layout plan / make some general design decisions about manufacturing.
I plan to ...
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Purpose and selection of inductor for RF power amplifier that has a VCC pin (MAX2616)
I am currently building an RF amplifier PCB for around ~2.4 GHz using the MAX2616, which is a broadband RF amplifier for 40 MHz to 4000 MHz.
Looking at the datasheet, I am confused about the purpose ...
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Very low RF-DC conversion efficiency in ADS (SMS7630 & HSMS-282E)
Simulating RF rectifier in ADS (2.45 GHz, 5 dBm). Using HSMS-282E gives 11% PCE, SMS7630 gives 20% PCE. Matching is correct (good S11). Using SPICE models from datasheets. Load = 2 kΩ. Using HB with ...
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