The model of the dipole antenna consists of a source and two separated wires. The electrons flow alternatively in the wires, generating electromagnetic waves. However, in practice, I found that even when the two separated wires were connected, it can also work. The material of the wire is commonly used metal.
As shown in the figure. Both two structures of antenna works and the chip can be read. I had also trying to simulate the 'single wire dipole antenna' as shown in the figure but the S parameter is nearly 0 dB. However, in practice, the chip can be read at a 30 cm distance with a 4W EIRP RFID reader.
If the resistance of C RC=0 (assuming perfect conductor), the source is supposed to be shorted and no electrons will flow in A and B, right?
The length of C is around 3-4 mm.
Dear Ll Lee ,
By connecting the two poles of the antenna by a short metallic wire, then you make more or less short circuit between the terminals of the oscillator especially at relatively low frequencies.
Only the voltage induced at the shorting wire will act as an exciter for the antenna.
So, this arrangement will radiate but with much smaller radiation density.
Best wishes
let us consider the old analog radio at home. transmitter at broadcasting station is a single wire system and the antenna of your radio set is a si,gle telescopic wire. in short, there is a mirror antenna wire provided a conductive plan (the earth surface). of sure the yield of such antenna is less than a true dipole.
in this case,you have a ring antenna and if the two chips are close each other, high coupling gives good transmission. to go further a diagram of the hardware implementation is welcome.
Dear Ll Lee ,
By connecting the two poles of the antenna by a short metallic wire, then you make more or less short circuit between the terminals of the oscillator especially at relatively low frequencies.
Only the voltage induced at the shorting wire will act as an exciter for the antenna.
So, this arrangement will radiate but with much smaller radiation density.
Best wishes
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