Kathrein antenna benefitscompared to
Patch antenna
plane creates the electrical field lines
©Kathrein Kohl 02/09
Cross polar ratio (+/- 45° polarization)
Cross polar ratio describes the correlation between two orthogonal polarizations measured in the farfield (accurate +/- 45°)
Ratio between the co-polar and the cross-polar signal
(identical compared to opposite polarization)
orthogonal polarizations
dipole element (patent pending)
sector +/- 60 degree >10 dB
Antenna 800 10305 : Xpol Panel 806-960 65° 17 dBi 0°- 8° T
Antenna 742 215 : Xpol Panel 1710-2170 65° 18 dBi 0°- 10° T
measured CPR values of Kathrein antennas :
Since they have no seperate structures for plus and minus system, good CPR values are often hard to achieve with patch structures
Tabelle1
Frequency 870 MHz
Frequency 2110 MHz
High isolation
required because both terminations of a Xpol antenna are used for Rx and Tx
Dipole versus Patch structures High isolation
Due to patented decoupling elements Kathrein antennas
provide an isolation of > 30 dB between
- the different polarizations
- the frequency bands
Decoupling elements usually not usable on PCB
-45° +45°
Low intermodulation products
> -150 dBc for 3rd order products at 2 x 20 W (43 dBm)
Dipole versus Patch structures Low intermodulation
research on intermodulation
since 15 years
bad PCB material
©Kathrein Kohl 02/09
The low loss cable harness enables to reduce the
antenna height by about 20% compared to
printed circuit harnesses
Cable
feeding
Smaller length is smaller windload
Higher internal losses have to be compensated by additional stacking of radiators
Tabelle1
Dipole versus Patch structures Environment
Kathrein antennas :
significantly effect the
*
Due to the slim structure of dipoles and small surface (e.g. compared to patches), the created additional capacitance is relatively low
Dipole versus Patch structures Environment
Patch design
dipole design
Rain, snow or ice create a load on the radiating elements; this additional capacitance depends on the surface area of the radiators
34.bin
Dipole technique provides:
High isolation with special elements
Low intermodulation products
Low internal losses
Conclusion:
PCBs are no „bad“ technology but should be used where appropriate
Kathrein Indoor Panel with PCB feeding
DT-60°-50°-40°-30°-20°-10°0°10°20°30°40°50°60°
Tilt 018,622,422,922,522,723,324,827,332,460,928,921,416,4
Tilt 220,322,721,621,121,221,923,425,730,145,33021,716,7
Tilt 424,924,521,820,720,921,62325,229,137,6302217,1
Tilt 631,624,821,520,620,821,823,325,629,232,326,820,616,1
Tilt 832,523,120,620,220,822,123,926,32928,323,518,814,7
DT-60°-50°-40°-30°-20°-10°0°10°20°30°40°50°60°
Tilt 017,722,424,12321,921,421,321,72221,619,316,213,3
Tilt 213,115,717,919,921,422,423,324,526,228,627,122,218,4
Tilt 410,913,115,117,119,321,523,726,329,635,333,326,622,1
Tilt 610,612,51415,517,319,221,223,42628,628,425,723
Tilt 813,815,216,4182022,525,328,632,335,43430,224,5
Tilt 1012,615,817,219,120,92426,227,83336,534,23225
length 1296mmlength 1936mmlength 1302mm
65°/15dBi/6°DT65° 16.5dBi 65°/18dBi