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Front-end characteristics• Frequency bands :

• 1) 324-348 GHz (without H2O line 321 GHz)

• 2) 321-348 GHz (including H2O line).

• Expected receiver temp : 1500K(DSB) - 3300K(SSB)

• Fixed tuning : integrated design

• Schottky diodes mixer & HBV diodes tripler at ambient Temp.

2 different scenario

possibles

Bri

gthn

ess

tem

pera

ture

(K

)

Fol1Fol2 Fol3Fol3bis

Frequency (GHz)

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1st architecture scenario

• a single channel receiver head

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2nd architecture scenario

• a dual channel receiver head

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coupler

HornSubharmonic

mixerLNA

Triplerharmonic

mixer

LO source(Gunn)

PLL ReferenceOscillator

IF signal

Sp

ectr

al a

nal

ysis

mod

ule

An

ten

na

Coupler

Generic architecture of a channel

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Mixer design possibilities

• 1st design (400GHz UVa design) • 2nd design (MIRO-like type)

Subharmonic mixer cell using planar Schottky diodes pair (Univ. of Virginia)

planar diode (UVa) :

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Tripler design possibilities

• design (290 GHz tripler-like) • Preliminary values :

• Freq. In : 56 GHz

• Freq. Out : 168 GHz

• Pin = 100-150 mW

• Pout = 10-15 mW

• n = 10%

HVB diodes (InP based) tripler cell (IEMN- Lille)

HBV diodes (8 barriers) :

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Expected performances• single channel receiver

• dual channel receiverScenario 2 Typ Min Max CommentsRF band (GHz) 321,00 348,00 To (K) = 298IF band (GHz) 1,40 7,60LNA NF (dB) 1,4 1,20 - could be optimized to 1,2LNA gain (dB) 34 - - Ampli LNA : MiteqLNA band (GHz) 0,10 8,00 AFS4-00100800-14-10P-4Mixer SSB temperature (K) 2398,00 2398,00 2698,00Mixer eq. DBS temp. (K) 1050,00 1050,00 1200,00 Hypothetic valuesConv. losses DSB (dB) 7,00 7,00 8,00 Hypothetic valuesConv. losses eq. SSB (dB) 10,00 10,00 11,00 Eq. in lower & upper SBSystem temp. DSB (K) 1618,12 1525,33 1915,22System temp. SSB (K) 3531,55 3346,41 4125,05

Scenario 1 Typ Min Max CommentsRF band (GHz) 321,00 348,00 To (K) = 298IF band (GHz) 1,6 (resp 2,4) 13 (resp 14)LNA NF (dB) 2,40 - -LNA gain (dB) 32,00 - - Ampli : MITEQLNA band (GHz) 2,00 18,00 AFS6-02001800-24-10P-6Mixer SSB temperature (K) 2398,00 - 2698,00Mixer eq. DBS temp. (K) 1050,00 - 1200,00 Hypothetic valuesConv. losses DSB (dB) 7,00 - 8,00 Hypothetic valuesConv. losses eq. SSB (dB) 10,00 - 11,00 Eq. in lower & upper SBSystem temp. DSB (K) 2151,93 - 2587,25System temp. SSB (K) 4596,65 - 5465,93

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Sensitivity results• single channel receiver

• dual channel receiver

System temp. SSB (K) : 4596,65 Typical caseBandwidth Integration time (s) Comments

(MHz) 1 9 50 1200,1 14,54 4,85 2,06 1,33 Spectrometer0,2 10,28 3,43 1,45 0,94 Spectrometer0,5 6,50 2,17 0,92 0,59 Spectrometer

1 4,60 1,53 0,65 0,42 Spectrometer2 3,25 1,08 0,46 0,30 Spectrometer

50 0,65 0,22 0,09 0,06 Filter (center of line)100 0,46 0,15 0,07 0,04 Filter (border of line)200 0,33 0,11 0,05 0,03 Filter (border of line)800 0,16 0,05 0,02 0,01 Filter (window channel)

System temp. SSB (K) : 3346,41 Minimal caseBandwidth Integration time (s) Comments

(MHz) 1 9 50 1200,1 10,58 3,53 1,50 0,97 Spectrometer0,2 7,48 2,49 1,06 0,68 Spectrometer0,5 4,73 1,58 0,67 0,43 Spectrometer

1 3,35 1,12 0,47 0,31 Spectrometer2 2,37 0,79 0,33 0,22 Spectrometer

50 0,47 0,16 0,07 0,04 Filter (center of line)100 0,33 0,11 0,05 0,03 Filter (border of line)200 0,24 0,08 0,03 0,02 Filter (border of line)800 0,12 0,04 0,02 0,01 Filter (window channel)

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Comparison between single/dual channel design

• Advantages of dual channel• Better SSB receiver noise,

• Redundancy of the front-end (in case of failure).

• Drawbacks• weight, space, power supply (price ?) increased

• Quasi-optical alignment more complex

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Realisation context

• Baseline :• Mixer development : Obs - Astrium - Virginia

diodes

• Multiplier : Obs - IEMN - Astrium

• Low Noise Amplifier : Miteq, Chalmers• LO source :

• Gunn : RPG - Farran

• PLL : Omnisys, Farran

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Frontend-Mixer Schedule