Patch Antenna Soldering SMA 20200207

Soldering SMA connector to the microstrip antenna's transmission line feed. Port impedance is 50 ohm (theoretical).

[@Vibranium603]

Helpful. Gave me clarity on something new to me!

[@JuanMarioShalvarez]

Did this soldering cause way too more impedance mismatch than simulated? Can you please provide simulated and actual(if you've made a measurement) S₁₁ parameters for resonant frequency? Thank you.

[@Pidro__]

Thanks.(Like)

[@dilekuzer4892]

Thanks for your video. I' d like to ask why you use a Male SMA connector.

[@dukiesengineering]

The TV box in which the antenna is going to be installed is a female connector.

[@ahmedalmasry1143]

Please, what is the diameter (inner and outer) of the SMA connector? And can I used for coaxial probe feed?

[@dukiesengineering]

Yes, you can because the inner conductor is cylindrical. I bought them here www.ebay.co.uk/itm/353063050858.

[@dukiesengineering]

However, I would pay for more expensive probes just to compare performance if you are using them for PhD study.

[@raven9965]

what material are you covering the ground plan with? can i use kapton tape?

[@dukiesengineering]

Why would you want to cover the ground plane?

[@raven9965]

@@dukiesengineering as a temporary fix. The ground plan acts like a huge heat sink, when Your trying to solder To it. Someone once told me you could use tape to help. With the tape, you would cover the whole ground plane expect the spot your soldering. Kapton tape is heat resistant.

[@dukiesengineering]

@@raven9965 Oh I see, I use that tape for sublimation of mug

[@dukiesengineering]

I will try next time and put a video up if successful. Thanks again for this.

[@krisraps]

can you make similar antenna for ham frequencies? like 3mhz to 40 mhz?

[@dukiesengineering]

Yes, but it will be very large. The width is lamda by 2 so the FR4 would be quite large. Also, HAM radio probably uses a different port impedance and connectors, so the transmission line will need to be recalculated to match the port impedance. Easy to do on electromagnetic simulation or analytical formula, but Yagi would be my take when it comes to low frequencies operation.

[@glaura1581]

i think it's really helpful for me and i will recommend this video to my friends.and have you ever used SMA connectors in elelcbee from China? thanks!

[@dukiesengineering]

I buy all my SMA connectors from China via Ebay. All good so far.

[@korhanerkan6731]

How did you turn your female sma to male header ?

[@dukiesengineering]

Use a Male to Male adaptor.

[@krisraps]

it would be much easier if you cut the pins before you solder it on i think, good video btw

[@dukiesengineering]

In truth, I now leave the pins on to provide rigidity when connecting and disconnecting the antenna from a device.

[@314neel]

Hello What kind of feeding technique is it?

[@peterdale6060]

i think its coaxial

[@dukiesengineering]

It is called an inset fed. On the edge of patch, the impedance is about 300 ohms. The SMA connector is 50 ohms, so I used the double sided FR4 substrate and microstrip line to feed to the inset edge of the antenna to match the 50 ohm impedance.

[@dukiesengineering]

More details can be found in Peter Hall's book Microstrip Antenna Handbook.

[@mouwll]

Is that Male SMA?

[@dukiesengineering]

Yes, more expensive than female ones, but since my portable VNA has female, so calibration reference point is good if I have a male SMA, otherwise I will have to add an adaptor which may have small reflection due to discontinuity or mismatched.

[@brunodemelo4154]

lol just cut the unused pins before!

[@dukiesengineering]

The reasons I don't cut it before is that it helps the SMA connector from moving about when the soldering tip touches it.