摘要:
The invention relates to a transmission method in a wireless network comprising at least a node. In order to increase the transmission speed, the method comprises the following steps: - transmission by the node over at least one first physical channel of at least one request to send (402), - reception by the node of at least one agreement to send (403) data over at least one second physical channel using at least one frequency band belonging to the extremely high frequencies, and the first and second physical channels being different, - data transmission after reception. The invention also relates to a communication management method.
摘要:
The present invention relates to a multiband planar antenna consisting of at least one resonator (20) formed of an element having a closed shape made on a substrate and dimensioned so as to operate in its fundamental mode at the resonant frequency of the lowest band. The resonator is fed by a feed line (21) in such a way as to operate in all the higher modes. The resonator comprises means (22a, 22b, 23a, 23b, 23c, 23d) for modifying the resonant frequencies of the various modes in such a way as to cover the bands concerned. The invention applies in particular in wireless networks.
摘要:
The invention relates to a transmission method in a wireless network comprising at least a node. In order to increase the transmission speed, the method comprises the following steps: - transmission by the node over at least one first physical channel of at least one request to send (402), - reception by the node of at least one agreement to send (403) data over at least one second physical channel using at least one frequency band belonging to the extremely high frequencies, and the first and second physical channels being different, - data transmission after reception. The invention also relates to a communication management method.
摘要:
The present invention relates to a FINLINE type microwave band-pass filter comprising a waveguide 203 provided with an insulating substrate 204 placed in an E plane of the guide and comprising on at least one of the surfaces, conductive inserts 205 electrically connected to the internal surfaces of the guide which support the substrate and which determine by their dimensions and their positioning on the substrate a Chebyshev type filter response curve. The filter includes at least one cavity 207 in perpendicular short circuit to the substrate, the positioning and the dimensions of the cavity determining a transmission zero on the filter response curve for attenuating the frequencies situated around this zero. Such a filter is used in particular in transmission terminals operating in the Ka band.
摘要:
The antenna has concentric outer and inner annular slots (60, 62), each comprising two rectangular protrusions (61, 63) on its outer and inner rim, respectively. The slots are supplied through two accesses by two common supply lines (64, 65) that cut across the slots in the directions of the respective protrusions. The slots allow an operating frequency of two sub-bands to be modified.
摘要:
The present invention relates to a multiband planar antenna consisting of at least one resonator formed of an element having a closed shape made on a substrate and dimensioned so as to operate in its fundamental mode at the resonant frequency of the lowest band. The resonator is fed by a feed line in such a way as to operate in all the higher modes. The resonator comprises means for modifying the resonant frequencies of the various modes in such a way as to cover the bands concerned.
摘要:
The invention relates to a dual-band planar antenna formed by at least one slot of closed shape fabricated on a printed substrate having a perimeter equal to kλ f , and two supply lines supplying power to the slot via two accesses separated by (2m+1)λ f /4, where λ f is the guided wavelength in the slot and k and m integers greater than 0, the slot comprising means modifying the operating frequency, one of the supply lines being situated on the said means. The invention is especially applicable to antennas used in domestic wireless networks (IEEE802-11a or Hyperlan 2 standards).