reflector

Reflector antennas are devices that reflects electromagnetic waves. They focus a beam signal into one point (called focal point) or directs a radiating signal into a beam. They are used when high gain (more than 30dBi is common) is required, typically for earth to space communication or microwave point-to-point links.

For theory see:

Orphanids, S: Electromagnetic Waves and Antennas, 2004-10, chapter 14: http://www.ece.rutgers.edu/~orfanidi/ewa/ch20.pdf
Kraus, J.D., Marhefka, R.J.: Antennas for all applications, Mc Graw Hill 2003, chapter: Slot, Patch and Horn antennas (9)

Simulations - Cassegrain reflector:

	Cassegrain reflector antenna, surface current distribution.
	Cassegrain reflector antenna, electric field (absolute value) at the cut.
	Cassegrain reflector antenna, electric field animation at the cut.
	3D radiation pattern of the Cassegrain antenna.

Simulations - Offset reflector:

	Offset reflector antenna, distribution of the electric field at the surface.
	Offset reflector antenna, distribution of the surface electric current.
	Offset reflector antenna, radiation pattern.
	Offset reflector antenna, animation of the electric current.
	Offset reflector antenna, animation of the electric field. Note the main physical effect of the reflector: transformation of the spherical waves emanating from the horn to "plane" waves.

Gallery:

[Show thumbnails]

OLYMPUS DIGITAL CAMERA

118-1862_IMG

118-1863_IMG

120-2030_IMG

ant3

$Some of reflector antennas are not used as reflector antennas itself but as a passive reflectors for different use. This is an example of passive mirror – reflector for measurement in antenna anechoic chamber. Using one or more such mirrors we are able to make a ray of the antenna beam longer. Such mirror – or let say “passive reflectors” have a longer focus (very flat reflector with f/D more then 1. To avoid to the diffraction on the edges, the special fluent transition over the edge is usually made, in some cases also absorbers can be used to absorb these parasitic currents. The method of measurement using this additional mirrors is known as CATR – compact antenna test range.$

$Some of reflector antennas are not used as reflector antennas itself but as a passive reflectors for different use. This is an example of passive mirror – reflector for measurement in antenna anechoic chamber. Using one or more such mirrors we are able to make a ray of the antenna beam longer. Such mirror – or let say “passive reflectors” have a longer focus (very flat reflector with f/D more then 1. To avoid to the diffraction on the edges, the special fluent transition over the edge is usually made, in some cases also absorbers can be used to absorb these parasitic currents. The method of measurement using this additional mirrors is known as CATR – compact antenna test range.$

$Some of reflector antennas are not used as reflector antennas itself but as a passive reflectors for different use. This is an example of passive mirror – reflector for measurement in antenna anechoic chamber. Using one or more such mirrors we are able to make a ray of the antenna beam longer. Such mirror – or let say “passive reflectors” have a longer focus (very flat reflector with f/D more then 1. To avoid to the diffraction on the edges, the special fluent transition over the edge is usually made, in some cases also absorbers can be used to absorb these parasitic currents. The method of measurement using this additional mirrors is known as CATR – compact antenna test range.$

$Some of reflector antennas are not used as reflector antennas itself but as a passive reflectors for different use. This is an example of passive mirror – reflector for measurement in antenna anechoic chamber. Using one or more such mirrors we are able to make a ray of the antenna beam longer. Such mirror – or let say “passive reflectors” have a longer focus (very flat reflector with f/D more then 1. To avoid to the diffraction on the edges, the special fluent transition over the edge is usually made, in some cases also absorbers can be used to absorb these parasitic currents. The method of measurement using this additional mirrors is known as CATR – compact antenna test range.$

$Some of reflector antennas are not used as reflector antennas itself but as a passive reflectors for different use. This is an example of passive mirror – reflector for measurement in antenna anechoic chamber. Using one or more such mirrors we are able to make a ray of the antenna beam longer. Such mirror – or let say “passive reflectors” have a longer focus (very flat reflector with f/D more then 1. To avoid to the diffraction on the edges, the special fluent transition over the edge is usually made, in some cases also absorbers can be used to absorb these parasitic currents. The method of measurement using this additional mirrors is known as CATR – compact antenna test range.$

ASTRA7

20151201_133227_HDR

Dual_band_feed7

BackwardFeed

OLYMPUS DIGITAL CAMERA

OLYMPUS DIGITAL CAMERA

Dual_band_feed5

Dual_band_feed4

Dual_band_feed3

Dual_band_feed1

23cm_septum_feed_Italy_a

Betzdorf-antenna-park-arial

BTZ_07

BTZ_23

BTZ_31

BTZ_36