Specifications

LEON-G100/G200 - System Integration Manual
GSM.G1-HW-09002-C Preliminary Design-In
Page 63 of 75
Figure 42 and 43: |S
11
| and |S
21
| comparison between a 900 MHz tuned half wavelength dipole and a penta-band internal
antenna, if |S
21
| like in marker 3 area are similar the target antenna performances are good
Figure 44 and 45: |S
11
| and |S
21
| comparison between a 900 MHz tuned half wavelength dipole and a wideband commercial
antenna, if |S
21
| like in marker 1/2 area are similar 5 dB better in the dipole case, so the wideband antenna radiation is
considerably less
For good antenna radiation performance antenna dimensions should be comparable to a quarter of the
wavelength. Different types of antenna that can be used for the module, many of them (e.g. patch
antennas, monopole) are based on a resonating element that works in combination with a ground plane.
The ground plane, ideally infinite, can be reduced down to a minimum size that must be similar to the
quarter of the wavelength of the minimum frequency that has to be radiated (transmitted/received).
Numerical sample: frequency 1 GHz  wavelength 30 cm  minimum ground plane (or antenna size) 7.5
cm. Below this size, the antenna efficiency is reduced.