Differential dipole antenna system with a coplanar radiating structure and transceiver device
A differential dipole antenna system includes, on a same surface of a dielectric substrate, a first half of a thick radiating dipole, a first conducting strip of a bi-strip line for supplying a differential signal, the first conducting strip being connected to the first half of the thick radiating dipole, a second half of a thick radiating dipole and a second conducting strip of the bi-strip supply line, the second conducting strip being connected to the second half of the thick radiating dipole. The system further includes, on the same surface, an additional conducting strip defining a short circuit connecting the first half and the second half of the thick dipole, and a differential resonating filtering device having a bandwidth adapted so as to be combined with the resonance generated by the short circuit so as to generate an antenna impedance matching.
1. A differential dipole antenna system that comprises, on a same surface of a dielectric substrate, a first half of a thick radiating dipole, a first conducting strip of a bi-strip line for supplying a differential signal, said first conducting strip being connected to the first half of the thick radiating dipole, a second half of a thick radiating dipole and a second conducting strip of the bi-strip supply line, said second conducting strip being connected to the second half of the thick radiating dipole, wherein said differential dipole antenna system further comprises:
on said same surface an additional conducting strip defining a short circuit connecting the first half and the second half of the thick dipole, and
a differential resonating filtering device having a bandwidth adapted so as to be combined with the resonance generated by the short circuit so as to generate an antenna impedance matching.
2. The differential dipole antenna system according to claim 1 , wherein the additional conducting strip is rectilinear and arranged in a direction orthogonal to the main direction of the supply line.
3. The differential dipole antenna system according to claim 1 or 2 , wherein the additional conducting strip is arranged at a predetermined distance from a supply point of the two halves of the radiating dipole by the bi-strip supply line, said distance being chosen sufficiently small to shift towards low frequencies a resonance generated by the short circuit on the radiating dipole.
4. The differential dipole antenna system according to claim 1 , wherein the first and second halves of the thick radiating dipole are of elliptic or semi elliptic shape.
5. The differential dipole antenna system according to claim 1 , wherein the first and second halves of the thick radiating dipole are of triangular shape.
6. The differential dipole antenna system according to claim 1 , wherein the differential resonating filtering device comprises a pair of coupled resonators arranged on said same surface, each resonator comprising two conducting strips positioned in a symmetrical manner in relation to an axis of said same surface, said two conducting strips being connected respectively to two conductors of a bi-strip port for connection to a bi-strip line for transmission of a differential signal.
7. The differential dipole antenna system according to claim 6 , wherein each conducting strip of each resonator is folded over itself so as to form capacitive coupling between its two ends.
8. The differential dipole antenna system according to claim 1 , comprising a quarter wavelength line with two coplanar conducting strips arranged so as to connect, in impedance matching, the bi-strip line for supplying the antenna to the filtering device, said quarter wavelength line being adapted in the form of printed circuit to exhibit discontinuities of structure generating at least one impedance jump and at least one capacitive coupling between its two conducting strips so as to reproduce a quarter wave phase difference.
9. A device for transmitting and/or receiving a wide bandwidth signal, comprising an antenna system that comprises, on a same surface of a dielectric substrate, a first half of a thick radiating dipole, a first conducting strip of a bi-strip line for supplying a differential signal, said first conducting strip being connected to the first half of the thick radiating dipole, a second half of a thick radiating dipole and a second conducting strip of the bi-strip supply line, said second conducting strip being connected to the second half of the thick radiating dipole, wherein said differential dipole antenna system further comprises:
on said same surface an additional conducting strip defining a short circuit connecting the first half and the second half of the thick dipole, and
a differential resonating filtering device having a bandwidth adapted so as to be combined with the resonance generated by the short circuit so as to generate an antenna impedance matching.
10. A differential dipole antenna, comprising, on a same surface of a dielectric substrate, a first half of a thick radiating dipole, a first conducting strip of a bi-strip line supplying a differential signal, said first conducting strip being connected to the first half of the thick radiating dipole, a second half of the thick radiating dipole and a second conducting strip of the bi-strip supply line, said second conducting strip being connected to the second half of the thick radiating dipole, wherein said antenna system further comprises on said same surface an additional conducting strip forming a short circuit connecting the first half and the second half of the thick dipole, and wherein said antenna system is configured to be connected to a differential resonating filtering device to form an antenna system.