Diplexer And Antenna Interface; General Description; Rf-Coupler; Interface To Antenna Feeder System - Non Integrated Antennas - Nera Evolution Series Technical Description

5.5.

Diplexer and Antenna Interface

5.5.1.

General description

The diplexer determines the ODU sub-band coverage and duplex spacing. Most frequency bands are
divided into only two sub-bands. See APPENDIX 1 for details. ODU transmit and receive frequency can
be set to any frequency within the given pass-band range.
5.5.2.

RF-Coupler

The additional loss for RF-Coupler is given in Table 5-16. The RF-Coupler is used in protected
configurations and single polarised 2+0 systems.
Transmission loss [dB]
Tx or Rx
5.5.3. Interface to Antenna feeder system – non integrated antennas
The interface between the ODU-Diplexer (1+0 configuration) or HSB-coupler (HSB configuration) and
the antenna feeder system is rectangular waveguide. The ODU-Diplexer and HSB-coupler flange types
and corresponding waveguides to be used (if remote mount) is shown in Table 5-17. The ODU-Diplexer
and HSB-coupler aluminium flanges are protected by chromate coating.
Frequency band
[GHz]
Waveguide
(remote mount)
ODU-Diplexer and
HSB-Coupler
Flange types
NGP\00329 Rev. C 23-06-2006
Symmetrical RF-
Coupler
Nom Max
3.4 3.8
Table 5-16 RF-Coupler loss
L6/U6 7/8
R70 /
R84 /
WR112
WR137
PDR70 CBR84
Table 5-17 ODU flanges and waveguide
Evolution Series - XPAND
Asymmetrical RF-Coupler
Main
Nom Max
1.5 2
11 13
R100 / R120 /
WR90 WR75
CBR100 CBR120
Protection
Nom Max
6.5 7
15 18/23/26
R140 / R220 /
WR62 WR42
CBR140 CBR220
32/38
R320 /
WR28
CBR320
33