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THE LOW PROFILE CAR TRANSCEIVER ANTENNA SYSTEM OF MOBILE RADIO ACCESS
Timur A. Gainutdinov, MTUCI, Moscow, Russia, tedia@mtuci.ru
Natalia M. Fedoseeva, MTUCI, Moscow, Russia
Abstract
Car antennas are one of the most common antennas in the HF and VHF bands. Typically, these antennas are used for reception of radio broadcasting signals or for departmental radio communication in a narrow frequency range. The paper offers the original design of transciever antennas that support the system of mobile radio access in the frequency range 140-160 MHz. Modifications of loop vibrators grounded on the roof of the car with a height of not more than 30 cm are investigated at the location in different places of the roof. Discusses how vertical location of the antenna, and sloping. It is shown that the location of the vertical vibrator at the end of the roof is an unsuccessful variant of the antenna location, while the inclined vibrator has a better agreement with the same vertical size as the vertical vibrator. In this case, the energy gain in matching in sloping vibrator substantially more gain loss compared to the vertical counterpart. The location of the modified loop vibrators in the center of the roof provides the best characteristics of the antenna, but the energy gain compared to the inclined version located at the end of the roof does not exceed 0.5 dB at the same vertical size of the antennas. For coordination of modifications of loop vibrators the composite scheme of coordination consisting of the parallel contour connected in parallel to an input of the antenna and the transforming L-circuit was used. It is shown that such antennas have VSWR not worse than 2-3 when using simple matching circuits and the minimum gain in the horizontal plane not less than -5 dB.
Keywords:monopole, grounded loop monopole, grounded dual loop monopole, grounded quadruple monopole, two unit matching circuit.
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Information about authors:
Timur A. Gainutdinov, Assistant professor, Cathedra of Technical Electrodynamics and Antennas, MTUCI, Moscow, Russia
Natalia M. Fedoseeva, undergraduate, Cathedra of Technical Electrodynamics and Antennas, MTUCI, Moscow, Russia