u-blox ZED-F9P Integration Manual page 88

ZED-F9P - Integration Manual
The absolute best performance will be obtained with the antenna in the center of the roof and not
tilted at any large angle. However the placement of automotive antenna in a mass production vehicle
will probably be compromised.
The antenna cannot be placed under a dashboard, in a rear view mirror or on the rear parcel shelf. It
needs to have very good signal levels and the wide as possible view of the sky.
Low cost L1 + L2 stacked patch antenna must have a minimum band pass performance from their
patch elements and the required internal SAW filtering. An example of the actual measured Band
pass characteristics of a low cost L1 + L2 antenna is shown below.
Figure 58: Low cost L1/L2 antenna Band characteristics
UBX-18010802 - R02 8 Design Page 88 of 114
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