SI4706 Просмотр технического описания (PDF) - Silicon Laboratories

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SI4706

Si47XX ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES

Silicon Laboratories 

AN383

Electrically Short Vertical Monopole Antenna over an Infinitely Large

Ground Plane

The model of an electrically short vertical monopole antenna over an infinitely large ground plane is shown in

Figure 37. The term "electrically short" describes an antenna much shorter than one wavelength. Our focus will be

on antennas 6 to 15 cm long, whereas at 100 MHz a wavelength is approximately 3 m.

XANT

IANT

RANT

Antenna Model

Figure 37. Model of an Electrically Short Vertical Monopole Antenna over an Infinitely Large

Ground Plane

XANT = Antenna Reactance

RANT = Antenna Radiation Resistance

IANT = Antenna Current

The antenna radiation resistance models the antenna power dissipating element and is given as:

RANT = 202-----c---f--L-- 2

, where L = meters, c = 3 x 108 m/s

The radiated power is given as:

PANT

=

I2RANT

=

I220





2------c--f--L--

2

, where L = meters, c = 3 x 108 m/s

56

Rev. 0.8

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