摘要:
The invention discloses a repeater antenna for use in point-to-point applications in telecommunications systems in the microwave range, intended for connecting transmissions from a first radio unit at a first site to a second radio unit at a second site. The repeater antenna is essentially plane, and is designed as a traveling wave antenna with at least a first and a second antenna beam, so that the first beam can be used for transmissions to and from said first radio unit, and the second beam can be used for transmissions to and from said second radio unit.
摘要:
A system and method for a single site beacon transceiver including an omnidirectional transceiver, a plurality of directional receiving antennas for receiving a signal, and a digital receiver for processing the signal to determine an azimuth to the source of the received signal. The digital receiver includes a plurality of receiver channels that are calibrated periodically and at least one processor that estimates a coarse signal azimuth for the signal by calculating an amplitude monopulse ratio for the signal using the two directional receiving antennas receiving the highest amplitude signal, and estimates a final signal azimuth for the signal using an interferometer baseline between the two directional receiving antennas or, alternately, subtracts the complex ratio of the measurements from the complex ratio of the antenna array RF model to determine the angle corresponding to the minimum of the absolute value of the difference.
摘要:
L'antenne est constituée par une pluralité de sous-réseaux (a7, a6, ..., a1, a′1, a′2, ..., a′7) linéaires identiques, parallèles et symétriques. Les centres de symétrie (b7, b6, ..., b1, b′1, b′2, ..., b′7) des sous-réseaux (a7 à a′7) sont alignés sur une ligne (c) perpendiculaire à leur direction et sont alimentés en phase. Chaque sous-réseau est constitué par une pluralité d'éléments rayonnants en nombre pair disposés à intervalles réguliers et qui rayonnent des champs déphasés de 180° d'un élément rayonnant au suivant. Le pas du sous-réseau est approximativement égal à une longueur d'onde guidée sur le substrat du circuit imprimé. Chaque élément rayonnant est une surface carrée conductrice dont le côté est approximativement égal à la moitié de la longueur d'onde guidée, avec un coin relié galvaniquement à la ligne d'alimentation. L'orientation des surfaces changent d'un élément au suivant.
摘要:
An antenna for a communication device, and also an RFID reader incorporating the said antenna, are disclosed. The antenna has a structure comprising a ground portion and a radiating component. The radiating component has a first side, and a second side that is spaced apart from the first side. The first side has a ground edge portion which is in contact with the ground portion, and the first side extends, from its ground edge portion, away from a surface on one side of the ground portion. The second side also has a ground edge portion which is in contact with the ground portion, and the second side also extends, from its ground edge portion, away from a surface on said one side of the ground portion. The radiating component also has a joining portion which is spaced apart from the ground portion on said one side of the ground portion, and the joining portion extends between the first side and the second side, such that there is a region of space defined between the first side and the second side and between the joining portion and the ground portion. At least one of the first side and the second side has a slot therein.
摘要:
An active antenna apparatus comprises a connection for receiving a signal that is to be transmitted and an antenna for producing a radio signal on the basis of the signal that is to be transmitted. The active antenna apparatus additionally comprises a controller that is configured to control the antenna on the basis of intended properties of the radio signal. The active antenna apparatus has a coupler between the connection and the antenna, which is designed to couple out a signal component from the signal that is to be transmitted. The active antenna apparatus additionally has an energy converter that is connected between the coupler and the controller and is designed to provide a power signal for operation of the controller on the basis of the coupled-out signal component.
摘要:
Antenna system wherein the separate transmit and receive microstrip antennas each has respective arrays of radiating patch elements. Each of the antennas is fed from a single end thereof so that each antenna creates four beams. Beam pitch angles are introduced into each antenna so as to reduce the coupling between adjacent lines to allow the gap within each connected line pair to be reduced. This gap reduction provides room for the antennas to be interleaved within a common rectangular aperture so that the separate feeds are at opposite ends of the aperture. Each antenna then utilizes the entire aperture. Isolation means are provided between the lines of the transmit and receive antennas so as to reduce the mutual coupling therebetween and maintain the minimum required sixty dB isolation.
摘要:
A composite cable (4) houses a plurality of leaky coaxial cables having mutually different radiation characteristics. The leaky coaxial cable (2a, 2b) includes therein an inner conductor and an outer conductor, and has a plurality of leakage slots. The plurality of leakage slots have different slot periods relative to the axial direction or arranged in different slot patterns. The digital wireless communication device feeds a high-frequency signal from an end of the composite cable (4) and performs MIMO (multiple-input multiple-output) communication.
摘要:
The invention discloses a repeater antenna for use in point-to-point applications in telecommunications systems in the microwave range, intended for connecting transmissions from a first radio unit at a first site to a second radio unit at a second site. The repeater antenna is essentially plane, and is designed as a traveling wave antenna with at least a first and a second antenna beam, so that the first beam can be used for transmissions to and from said first radio unit, and the second beam can be used for transmissions to and from said second radio unit.