Why is the Thuraya terminal antenna thickness larger than the normal GSM satellite phone antenna?

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Why is the Thuraya terminal antenna thickness larger than the normal GSM satellite phone antenna?

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The Thuraya satellite phone user terminal operates on a dual frequency of GSM 900 MHz and satellite at a 1.6/1.5 GHz range and therefore requires additional hardware for such dual band operations. The Thuraya satellite phone uses a Quadrifilar helical L-band antenna consisting of helices wound on a cylinder, which give it a larger in size compared to normal GSM antennas.

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