Hi Dave,
I build a 28 x 30 cm and 5cm off the ground plane. I measure 60 MHz BW for 20 dB return loss. We tested with a transmitter-receiver and got very good directivity. We are building 5 others and we will tested at the museum.
I said that the I had 2 feet deep but in fact I have only...
...but do you know a program that calculates the dimensions?
I am a consultant. I can't afford big software for specific application. PCAAD is affordable and I can do a lot with Eagleware (now Agilent) linear and the EM 2D + 3D simulator which work very well for patches.
One day I might put...
I simulated the 2 x 7 and I found the probe location with little iteration for 50 ohms. Good!
Now, I did lots of search to find a program that calculate the dimensions, and no success. It is easy to find a simulator but not easy to find a program that calculates different types of patches...
OK, it's like a short stub transmission line.
So the 2 inches is the width and 7 in is the lenght of the half wave or the lenght of 3.5 but shorted at the cut will be quarter wave...and this is feasible only when the thichness is small. OK, I learn something new today. I will Google some of...
Here I need more info (limited knowledge with patches):
What is a quarter wave shorted patch or half wave standard patch in relation with the program that calculate the impedance?
If I enter 2 x 4 x 62 mils rectangular patch in the software and if I select Probe fed, the software calculate the...
Regarding the 2 x 4 patch 62 mils with dielectric of 4;
I enter these values in PCAAD. It calculate 0 +J 1.5 of impedance at 433 MHz? I tried different location from the edge.
How did you calculate the matching?
www.FrancoisMethotCV.com
Thank you for your input.
The program estimated the directivity to 8.5 and this is why I build this one. I will test to see if it is true.
I will definitively look at array...so you say that I can build a 2 x 4 on FR4 60mils...where do I place the probe?
www.FrancoisMethotCV.com
This is my first patch design and build.
The 31% was calculated from PCAAD 5.0.
Yes I build it. I got 10 dB return loss +/- 60 MHz centered at 433 MHz. The 4 pF in series provide a good 25 dB return loss +/- 10 MHz.
This is to install inside the floor of a museum. They install a TXRX unit...
I buid it. I loaded the S11 file generated by PCAAD into a Eagleware linear simulator and got a perfect match with a 4 pF in series. I install a 4 pF between the probe and the patch. I mesure the S11 and got 25 dB return loss at 433 MHz!
Is there a way to build it smaller a get 8 dB of...
I have to build a patch antenna at 433 MHz with 8 dB of directivity.
Using PCAAD, I end up with a patch 28 x 30 cm at 5 cm from the ground plane using air. The probe is at 7 cm from the edge and the program calculated 8.5 dB and the BW is 31%. I like the 31% BW because it mean that it will be...
