摘要:
A diversity antenna for the meter and decimeter wave ranges installed on a conductively framed dielectric surface in the body of a motor vehicle and substantially assembled from rectangular part surfaces, for example in a roof cutout or trunk with a dielectric trunk lid. A substantially wire-shaped antenna conductor is installed parallel with the conductive frame and spaced from a part thereof of the dielectric surface less than one fourth of the width of the dielectric surface. The wire-shaped antenna conductor has an interruption site which define a pair of antenna connection terminals. A two-pole, electronically controllable impedance network is incorporated in series in at least one additional interruption site. The position of the interruption site with the pair of antenna connection terminals, and the position of the additional interruption site are selected so that the antenna signals available at the different settings of the controllable impedance network are adequately decoupled in terms of diversity.
摘要:
Transportable, autonomously operating equipment as a network node between networks for transmitting analog, digital and/or pulse-modulated signals in communication connections between a satellite and exchanges for extension stations and/or terminal stations with antennas, modules, walls, doors and/or vent openings, as well as a method for establishing the communication connections by automatically leveling the equipment and calculating the data for controlling the satellite antenna and the north-south position of the equipment.
摘要:
In a monopole antenna, an antenna element is fitted into a dielectric body having a predetermined relative dielectric constant. A wavelength of a propagation wave is shortened by the shortening coefficient of wavelength which corresponds to the predetermined relative dielectric constant of the dielectric body. In this case, the antenna length of the antenna element can be shortened, so as to be equal to the shortened wavelength of 1/n of the shortened wavelength, “n” being integer. Thus the monopole antenna is small-sized.
摘要:
In order to transmit a signal received in a GPS antenna (20) to a GPS receiver body (30) through a glass plate (40), a signal transmission circuit (10) is divided into first and second signal transmission parts (11, 12). The first signal transmission part (11) is for transmitting a high frequency signal from an output terminal (20out) of the GPS antenna (20) to a first surface (41) of the glass plate (40). The second signal transmission part (12) is for transmitting the high frequency signal from a second surface (42) of the glass plate (40) to an input terminal (30in) of the GPS receiver body (30). The first signal transmission part (11) includes a first coaxial cable (111), a first electrode pair (112), a first balanced line (113), and a first balun (114). The second signal transmission part (12) includes a second coaxial cable (121), a second electrode pair (122), a second balanced line (123), and a second balun (124).
摘要:
A vehicle antenna mounting system whereby the antenna, associated antenna electronics (e.g., LNA) and RF and DC coupling are provided in an integral antenna assembly for installation on the exterior of a vehicle. The integral antenna assembly comprises a base section enclosing the associated antenna electronics and RF and DC coupling devices, and an antenna section pivotably mounted on the base section comprising the antenna. Two or more antennas are provided in the integral antenna assembly for SDARS reception on at least one satellite channel and a terrestrial channel. Another satellite channel can be provided for diversity purposes, or a global positioning system (GPS) satellite receiver for performing location services, among others, for the vehicle.
摘要:
The device comprises an antenna mounted within an external rear view mirror of the motor vehicle. This antenna is a helical antenna preferably a four-wire helical antenna.
摘要:
A road vehicle antenna includes a slot defined by an aperture in an electrically-conductive structure of the vehicle body and a further conductive structure disposed in the aperture, and a plurality of antenna feeds positioned so that the slot is excited in a first mode and simultaneously in at least one higher-order mode. The feeds are combined such that the antenna exhibits a diversity of radiation patterns in excess of the number of feeds. The antenna may be formed by a conductive area of a window and the surrounding window frame.
摘要:
The electronic circuit which is intended to feed a magnetic field sending coil has a first input terminal (1) for receiving a power-supply voltage (Uhat), a second input terminal (2) for receiving a periodic control signal (SC) within a predefined frequency range, an output terminal (4) for generating an output current (I) in sending coil (L) connected between the output terminal (4) and earth (M), in such a way as to convert the periodic control signal into a periodic magnetic field sent out by a coil. In this electronic circuit, a series RLC circuit (RLCI) is connected between the output terminal (4) and earth in order to form a tuned antenna with the sending coil (L). Such a configuration makes it possible to send out magnetic field according to an extended pattern so that a receiver unit has a better sensitivity.
摘要:
A dual polarization antenna for receiving and transmitting high frequency signals in conjunction with a substantially horizontal conducting vehicle panel defining a ground plane comprises three electrically conductive radiative elements, each radiative element being generally linear and extending between a proximal end and a distal end, and an electrically conducting mount (insulated from the vehicle panel) for securing the proximal ends together at a common point and in electrical circuit relation with one another for connection to a transceiver in the vehicle. The radiative elements extend vertically upwardly and outwardly from the common point whereby to form an imaginary cone with the proximal ends forming the apex of the cone. The radiative elements are of different lengths and disposed at an angle relative to the ground plane to provide horizontal and vertical polarization in a first, second and third frequency band.
摘要:
With the object of a single worker being able to mount an automobile antenna, side plates of a board bracket 9 with fixing plate are inserted into a rectangular hole formed in the base portion 3 so that [the side plates] are located on the opposite side surfaces of a rectangular projecting portion projecting from the bottom surface of the base portion 3. Spring pieces 4a are formed on these side plates. When the cylindrical projecting portion 13 extending from the rectangular projecting portion is inserted in the mounting hole formed in the roof panel, the spring pieces 4a formed on the side plates pass through the mounting hole and engage with the back side thereof. The antenna body is thereby temporarily fixed to the roof panel and a worker can remove his or her hands from the antenna body. The worker then goes within the vehicle body, screws the fixing nut 2 onto the cylindrical projecting portion 13, and can thereby fix the automobile antenna on the roof panel.