Design and key points of PCB board antenna

The antenna costs less but performs slightly worse. There are also several forms of PCB antenna.

A, plane inverted F antenna, abbreviation is PIFA

The following one is a variant of the PCB board antenna with plane inverted F, which is distorted due to a lack of space.

What should be paid attention to in the PCB design of this inverted F antenna? The first thing we need to know about radiofrequency, and we’ve written an article before, is that for radio frequency, any copper foil, a wire can’t be thought of as a simple wire, it’s an equivalent circuit made up of lots of resistance-capacitance circuits, you see a short circuit, it’s not a short circuit for radiofrequency. In this way, we look at the PCB design of the inverted F antenna.

There are six things to watch out for

1, the inverted F antenna, not just draw, there is a special online library of this kind of antenna, take it, put it up as required. If space is not enough, it is through their own simulation to make their own special antenna. Original today headline: Wolong IT technology

2, RF feed point here led to the line impedance must be 50ohm

3, grounding feed point must be firmly grounded

4, the plane must play more holes, the hole spacing is appropriate, we have written an article before, you can look for it

5, antenna here all layers of copper foil must clearance.

6. The antenna must be placed in the corner of the PCB board, and three sides should be empty, as shown in figure 2

The antenna on the mobile phone is called plane inverted F antenna, in principle is connected with a plane a grounding plane feed point, and RF feed point composition

From the bottom left, the RF feed point, the arrow, is an inverted F.The inverted F structure is the same, but the antenna in the mobile phone USES a plane structure, this inverted F antenna will have much better performance than PCB board antenna, so the space is less and the cost is low, which is the best choice for the mobile phone antenna.

In fact, there are many shapes of this plane for different mobile phones. The principle is plane inverted F structure. On this plane, one is to connect RF, and the other is to connect the ground feed point to form plane inverted F antenna.

These are different phone antennas. Their principle is flat inverted F antenna, is not long knowledge, remember thumb up.

B, inverted l-shaped PCB board mounted antenna

A variant of the inverted l-shaped antenna, also due to lack of space, twisted a bit to match the frequency

This inverted L shape needs to pay attention to the problem is almost no longer explained above, inverted L antenna is not inverted F antenna effect better because inverted F antenna has a grounding feed point, can effectively adjust the frequency point.

There are many PCB antennas in the market, mainly the above two kinds

From:http://www.hj-antenna.com/design-key-points-pcb-board-antenna/