Specifications

L70 Hardware Design
L70_HD_V1.0 - 24 -
4. Antenna interface
The L70 module receives L1 band signal from GPS satellites at a nominal frequency of 1575.42MHz.
The RF signal is connected to the RF_IN pin. Customer should use a controlled impedance
transmission line of 50 Ohm to connect to RF_IN.
4.1. Antenna
L70 module can be connected to passive or active antenna.
Table 11: Antenna specification for L70 module
4.2. Antenna supply
4.2.1. Passive antenna with external LNA
Typically a design using a passive antenna requires more attention regarding the layout of the RF
section. An external LNA between the passive antenna and the L70 module is strongly recommended
to add for improving receiver sensitivity. It is always beneficial to reserve a П or L passive matching
network between the passive antenna and the LNA. Figure14 is the rough reference design. For more
details, please refer to document [3].
Antenna type
Specification
Passive antenna
Center frequency: 1575.42 MHz
Band Width: >20 MHz
Gain: >0 dBi
Polarization: RHCP or Linear
Active antenna
Center frequency: 1575.42 MHz
Band Width: >5 MHz
Minimum gain: 15-20dB(compensate signal loss in RF cable)
Maximum noise figure: 1.5dB
Maximum gain: 50dB
Polarization: RHCP or Linear
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