Page 275 - System on Package_ Miniaturization of the Entire System

Mixed-Signal (SOP) Design 249

9.3 cm

Microstrip line

SMA
connector 4.7 cm

Termination: 46 ohms
1.5 cm resistor, connected to
reference plane

FIGURE 4.102 Top view of test vehicle.

be seen in the figure. Test vehicles 1 and 2 behave as common microstrip lines, due to
the solid reference plane underneath.
Far-field measurements have also been done for the test vehicles. The far-field
measurements were carried out using the Anritsu MG3642A RF signal generator
(bandwidth: 125 kHz to 2080 MHz), Agilent E4440A spectrum analyzer (bandwidth:
3 kHz to 26.5 GHz, and the antenna in anechoic chamber. Figure 4.104a shows the
measurement setup for the far-field measurements. Since the RF signal generator works
properly up to 2 GHz, the far-field measurements were also done up to 2 GHz. The
distance between the equipment under test (EUT) and antenna was 3 m in this case. The
RF signal generator was connected to the EUT as a source, and the spectrum analyzer,
which was connected to the antenna, recorded the field intensity from the surface of the
test vehicles. In this measurement, the radiation intensity from test vehicle 2 is the
maximum among three test vehicles, as shown in Figure 4.104b, and test vehicles 1 and
3 showed almost the same radiation intensity because a solid plane was used as a
reference plane for these two test vehicles.

Amps/Meter
13
12
10
0.7
7.2
5.8
4.3
2.9
1.4
0.0
(a) (b)
FIGURE 4.103 Simulation result for test vehicle 2: (a) 300 MHz and (b) 2.7 GHz.