__CFA
Characteristics__

The
CFA, as a very compact antenna, much less than the minimum height approved by
the FCC, has solved the problems of huge size and heights of conventional
antennas, which are related to the wavelength (Lamda/2
mast antenna) which reaches hundreds of meters. , associated with high voltages
and very large earthing copper net, which needs
hundreds of acres of land, adding to high enormous extending near field and
fading problems and interference with neighbor stations , so reducing their
power at night time or completely shut down.

BUT
the CFA has very little plate voltage, with no extending induction field or sky
waves., and 24 hours service at full power , because no interference with other
stations at night time .

The
near field of the CFA is 1/ R dependence, i.e. the near field is directly
proportional to distance, which is a very important unique fact of the CFA,
confirming the near field radiation.

**Briefly the CFA Characteristics are: **

**Frequency Band: Medium & Long Wave.****Horizontal Pattern: OMNI directional.****Vertical Pattern: Close to the Mast Antenna.****Input Impedance: 50 ohms ( or any desired Value)****Sideband VSWR: 1.2 :1****Antenna Height: 1-2% of wavelength.****Location: On the roof of the transmitter building or on the ground.****Phasing Unit: Mobile operating room, or stationary.****Site area needed: Less than 0.25% of the site area of mast antenna.****Radiation Efficiency: More than 90%.****Bandwidth: Broader than mast antenna., more than 30 % , good for DRM****Antenna Plate Voltages: Very low compared to base voltage of mast antenna.****Near induction field: Very little companied with tower antenna.****Gain: 5 - 7 dB uv /m more than the quarter antenna.****Good for Data Broadcasting & DRM.****NO FADING.****24 hours full power service****No interference with other stations****No sky wave****No frequency distortion**

__CFA Theory :__

**The CFA is a model for the far field radiation of the master high
antenna. The twin feeder Crossed Field Antenna is a near field radiator,
working by splitting the transmitter power into two equal powers (through a
phasing unit) into the plates of the CFA antenna. The CFA plates generating
separately electric field E and magnetic field H , in
time phase , whose ratio E/H matching space impedance , so radiation starts
from the near field to free space to infinity . **

**The input impedance of the CFA is pure resistance adjustable to
any value ( normally 50 Ohms ) , with zero reactance which means no stored
energy in the near field , only radiating field , with zero induction field ,as
very low Q antenna .The CFA is a very low profile antenna. The CFA was fed with
10 Kw DRM power (very broad bandwidth).**

** The near field of the CFA is 1/ R dependence, i.e. the near field
is directly proportional to distance, which is a very important unique fact of
the CFA, confirming the near field radiation., i.e
confirming Synthesizing the Poynting Vectors from the near field of the CFA **.

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