Patent ID: 8610529

Claim:
An impedance transformer operating in the VHF and UHF frequency bands, the impedance transformer comprising: a parallel low-impedance access Eb and a serial high-impedance access Eh, both intended to be connected to a printed circuit; and a multilayer circuit comprising: a long side for its connection to the printed circuit; at least three layers; a first outer layer separated from a second outer layer (Ce 2 ) of the same thickness by at least one inner layer of thickness at least four times greater than the thickness of the outer layers, each outer layer having two metalized faces to form electrical conductors; an internal face including an internal electrical conductor; an external face including an external electrical conductor facing the internal electrical conductor to form a microstrip line on each of the two outer layers, the two microstrip lines being symmetrical with respect to a central plane of the multilayer circuit parallel to the external faces; at two facing ends of the microstrip lines, a respective electrical connection between the end of the internal conductor of one microstrip line and the end of the external conductor of the other microstrip line to produce the parallel low-impedance access Eb; and at the facing other two ends of said microstrip lines, another electrical connection between the ends of the internal electrical conductors of the two microstrip lines, to produce the serial high-impedance access Eh, wherein both ends of the microstrip lines, respectively including the parallel low-impedance access Eb and the serial high-impedance access Eh, being on the long side of the multilayer circuit and close to each other to limit the area of connection with the printed circuit.