MaxTech NXP-16 Spezifikationen PDF herunterladen (Seite 63)

LEON-G100/G200 - System Integration Manual

GSM.G1-HW-09002-C Preliminary Design-In

Page 63 of 75

Figure 42 and 43: |S

| and |S

| comparison between a 900 MHz tuned half wavelength dipole and a penta-band internal

antenna, if |S

| like in marker 3 area are similar the target antenna performances are good

Figure 44 and 45: |S

| and |S

| comparison between a 900 MHz tuned half wavelength dipole and a wideband commercial

antenna, if |S

| 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.

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MaxTech NXP-16 Spezifikationen Seite 63