Radiofrequency transmission device

A radiofrequency transmission device (D′) comprising:

• a transmission unit (10) for transmitting a pulsed voltage signal (S) at a predetermined fundamental frequency (fF), generating parasitic voltage signals at frequencies which are multiples of the predetermined fundamental frequency (fF),
• a radiofrequency antenna (A),
• matching means (M1′) for matching the transmission frequency of the antenna (A) to the value of the predetermined fundamental frequency (fF),
• filtering means (30′) for filtering the parasitic voltage signals,
• a voltage source (Vcc), connected to the matching means (M1) and supplying voltage to the transmission unit (10),
• wherein:
• the filtering means (30′) are electrically connected to the transmission unit (10), and to the matching means (M1′), and
• said filtering means (30′) comprise:
• a number “n” of coils (B1, B2, Bi . . . Bn), electrically connected in series with each other, of which (n−1) coils (B2, B3, B4, . . . Bn) have a natural resonance frequency (fRLi) such that:
• fRLi=i×fF
• where
• fRLi is the natural resonance frequency of the i-th coil (Bi) ,
• i is a number varying from 2 to n,
• fF is the predetermined fundamental frequency.
• each having an inductance (Li) such that, at the predetermined fundamental frequency (fF):
• LTOT=L1+L2+ . . . Li+ . . . Ln=ZTOT=Z1+Z2+ . . . Zi+ . . . Zn
• and
• Li=Zi
• where
• LTOT is the total inductance of the “n” coils,
• Li is the inductance of the i-th coil (Bi),
• ZTOT is the total impedance of the “n” coils,
• Zi is the impedance of the “i-th” coil (Bi),
• n is an integer greater than zero.