PCB Antenna for 2.4GHz

 

PCB Antenna for 2.4GHz

 

Designing Schematics

Here we are scheming the 2.4 GHz antenna for the ESP8255 Mini board, so below is the circuit diagram for the identical. We may also build the complete PCB from this circuit diagram within the next article.

To design a proper schematic like this, we're going to use the ESP8285 layout manual furnished via espressif, but additionally, after I googled the hardware layout manual for ESP8285,  I became encountered the subsequent message:

So, I at once downloaded the hardware design manual for ESP8266, and on this documentation, I was capable of discovering the whole hardware design manual.

In the Hardware layout guide, there are some key design requirements that I want to factor out that are the Analog electricity delivery & Digital Power Supply for the ESP. Both the elements will be defined in detail later while we design the complete PCB for ESP8285 board, here we are able to most effective cognizance on designing the Antenna

2.Four GHz PCB Antenna Design

The antenna segment is made in order that it may be switched between the PCB antenna and a whip antenna.

The inductors L3 and L4 are simply there as a contingency plan.

The Board Layout

The above photo indicates you a totally laid board.

There are two fundamental sections of the PCB that we want to consider, first is the Antenna Section, 2nd is the Crystal Oscillator section. Again we can best focus on the Antenna phase.

The Antenna Section

Laying out the antenna segment is the maximum tough part of this undertaking,

First, we need to vicinity all the necessary headers and connectors,

Next, we want to locate the antenna, U.FL connector, programming header, transfer for the GPIO0, and the microcontroller; I just did that, as you could see inside the above image.

Next, course the antenna trace; for that, I am going to apply the Polygon device in Eagle PCB.

One keynote to don't forget before routing the hint is that the trace impedance has to be 50 ohms because it acts as a high-frequency transmission line, and these 50 ohms closely relies upon upon the dielectric cloth and the thickness of the board. So, we essential to calculate that first to plot the appropriate trace.

For we're going to use an internet-based device called the Mantaro.

To calculate the trace width, position all the required parameters; a lot of these parameters you may find on the producer's website

First is the hint width, which I physically entered & it's 70 mils.

The second is the Suggestion Thickness, its 1oz or 1.Four mils.

The third is Dielectric thickness, which is the thickness of the board that's 39.3701 or 1.6mm.

And fourth is Relative dielectric constants that may be found on the manufacturer internet site, and it varies from producer to producer.

Now, if I hit the analyze button, I am exactly getting a 50 ohms impedance.

Note! The impedance, in most cases, relies upon the trace width (w) & dielectric thickness (h).

So, the last routing looks like the above photo, and now it is just a count number of producing, programming, and trying out the board.

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