User's Manual

AN-D-212 SC14CVMDECT_SFxx_DB External Antenna Design and Leveraging Modular Approval

3.1.1 Printed Antenna Design Details

The printed antenna physical design is shown in Figure

2 (noting the 0.5mm grid in the picture).

Figure 2 Printed Antenna Physical Structure

The simulated radiation pattern is depicted in the fol-

lowing plot (with no 0402 component in Figure 2):

Figure 3 Simulated Radiation Pattern

The S11 plot of the SC14CVMDECT_SFxx_DB has

been measured (with no 0402 component in Figure 2)

and is depicted in the following figure:

Figure 4 S11 measurement plot of printed antenna

3.1.2 Tuning Components

For KDECT operation, the frequency band is centered

around 1.8GHz, whereas the default printed antenna

design configuration is designed to be centered

around1.9GHz. The printed antenna design holds a

provision for this shift in operating frequency. Please

refer to Figure 2. If a 100pF capacitor (0402 footprint) is

placed across the gap indicated by the green ellipse

indicated in Figure 2, then effectively the antenna

length is increased resulting in resonant frequency of

1.8GHz (without the 100pF 0402 components, the

antenna’s resonant frequency remains at 1.9GHz for

other DECT operation). No other tuning components

are required.

Figure 5 Printed Antenna Design S11 plot in

KDECT mode

The S11 plot (measured on the actual SC14CVM-

DECT_SFxx_DB Reference Design HW) with the

printed antenna design configured in KDECT mode