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Satellite digital audio radio service (SDARS) has been introduced in North America since 2001. Performance degradation occurs mainly due to the weak satellite signals in rural environment particular underneath dense foliage. Antenna diversity technique at the receiver is a suitable approach in order to overcome the problem of performance degradation. In order to analyze and optimize an antenna diversity...
In automotive application there is a strong need for compact multifunctional microwave antennas for example for cellular phones, GPS and, in the USA, satellite radio. The mutual coupling between the antennas leads to alterations in the antenna pattern which, in particular with the antenna for the SDARS- satellite system, is not accepted by the providers. In this paper it is shown how the impact of...
An antenna diversity for satellite digital audio radio systems (SDARS) was implemented as a first hardware demonstrator and tested. Proof is shown that for critical reception scenarios for example underneath dense foliage or in multipath situations between high buildings the antenna diversity yields a significant reduction of the bit error rate (BER). Full diversity function is achieved with no additional...
SDARS antennas must meet the very strict specifications of the two providers Sirius and XM and many automotive aspects in addition. With some car producers the base of the antenna is coplanar with the roof, in other cases the antenna is mounted on a cast. The cast changes the antenna pattern considerably. For example at high elevation angles with a 9 mm cast the antenna gain is reduced by 2 dB in...
In this paper a receiving antenna is presented which meets both the SDARS-specifications and the requirements for SDARS-antenna diversity application due to multipath reception even with satellite signals. The design principle allows in a further up-grading multi-band application for cellular phone e.g. GSM or UMTS
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