antenna

Hi everyone, I’m facing issues with my nRF52 BLE design due to a solder mask thickness change and grounding approach. I’d appreciate expert guidance on retuning the Pi filter, recalculating impedance, and resolving grounding concerns. Issues Faced: Solder Mask Thickness Change: Ref NRF52 DK...

In this proximity coupled antenna, is it necessary to solder a ground connection directly beneath the antenna? Or can the ground plane be connected to ground point elsewhere on the ground plane, far away from the antenna? Assume the patch substrate and ground plane are several wavelengths...

"A surface wave antenna operating in the 2.4 GHz band and efficient for launching surface electromagnetic waves at metal/dielectric interfaces is presented. The antenna operation is based on the strong field enhancement at the antenna tip, which results in efficient excitation of surface waves...

I'm trying to make an RFID chessboard, but using one reader underneath each square would be expensive. So, after some research, I found in a lot of places people using RFID antennas underneath each square and only one reader, but they don't provide a lot of details about it. So, how can I design...

Please can someone help me understand what type of antenna is in the attached pictures, and what it's characteristics might be (as a receiver)? (I'm afraid I'm very new to the world of RF, but want to learn!) The total height of the vertical part is 80 cm. The bottom part (containing the...

I have used my small loop antenna (which has a main loop and a coupling loop that can be tuned using a variable capacitor) with an AM radio receiver to receive MW broadcasts. However, the small loop antenna which was made by me was not working properly but when I connected a ferrite rod loop...

Hello everyone Could please someone explain to me why there are such big area vias and such a wide conductor connecting it? When i say "big area" i mean comparing to face side narrow conductor Kind regards Alex

Hi to all, I am undertaking a project to extend the remote control range for pergola louvers controlled by AC304-02 modules, which are generic roller shutter controllers operating at 433.92 MHz. These modules utilize a CMT2210LB RF chip and are paired with a standard Dooya 15-channel remote...

Hi all :) I have a straight piece of 3/4 inch (~10mm) diameter copper tubing that is around 40cm long. It’s being used as an antenna as part of a Theremin circuit I’m building; essentially this means that this copper antenna is acting as a capacitor to ground, and has its own (tiny) capacitance...

I'm looking for an antenna (PCB or chip), which I'd like to install in an environment that can exceed 110°C. Here are my questions : Should I trust the temperature ranges given for antennas? The temperature ranges are actually present in the filters on websites (e.g. Mouser), but rarely in...

Hello! I am working at an university and we want to built a new RF lab. For a free space measurement setup we are searching for a suitable company to buy horn antennas with dielectric lenses for frequencies up to 26.5 GHz. Has anyone here made some good experiences with a specific company for a...

Hi, Current project is to move from a 1/4 wave whip antenna to a ceramic chip type (e.g. Johanson 1575AT43A0040). I have a pi matching network on the pcb and can look 'into' the antenna with my vector network analyser and get the conjugate impedance. I have tried to simply match that to 50...

So I purchased this : (HanRongDa HDR-831) HanRongDa HDR-831 It's working great but the practical range is about 15 meters. I'm looking to upgrade this. The thing is, I know very little about radio frequencies and antennas. Can something like this work ? Ebay Amplifier The device I purchased...

I have an RF Explorer to use to scan what RF's are around me. I am curious as I'm am just getting in learning about wireless transmission and propagation. However I can't explain these power levels of -10 dbm all the way to -0. The RF Explorer does seem to be working correctly just based off of...

Hello, I have two questions about this circuit. 1- What is the efficiency of the circuit and how to find it? 2- What is the purpose of connecting two transistors in parallel? Thank you for your time.

I need Tips and recommendations on how to design a PCB with multiple RF circuits. In my case, the PCB includes a GPS receiver, 802.15.4 2.4GHz, and 433 MHz transceivers. I plan to use a GPS module with a patch antenna. The 433 MHz transceivers will have a PCB or ceramic antenna. an external...

Hi, I am using LORA. Is there any multiband antenna that can support these two frequencies? or I would need an antenna with the same footprint for 915MHz and 433MHz. Technically, as the frequency reduces antenna length increases. I am wondering with advancements in technology if at all...

Hello! I am currently doing a school project where we are going to design a direction finding system using antennas and an automated robot arm to adjust to angle. From what we have read the most reasonable choice of antenna is either a yagi or parabolic antenna. The robor arm is fairly small...

We know that conductive surfaces reflect the radar signals very well and the radar sees the surface. Why this is not like that when the antenna is circularly polarized?

Hello. I have bought a ham radio kit. The instructions tell me to connect it to a 50ohm 7Mhz antenna. I've searched how to make one but there are only blurry schemes of antennas I can't understand. I would appreciate if someone that knew about this topic explained to me how to make one and...