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Loads (1.5kW to 3kW, Convection and Watercooled)

We offer a range of Low Power and Sliding load terminations has been designed to offer optimum Return Loss Performance. Sliding loads The standard sliding loads are assembled in the... Read full description

SKU: loads

Categories: Waveguides

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Description

We offer a range of Low Power and Sliding load terminations has been designed to offer optimum Return Loss Performance.

Sliding loads

Sliding load diagram

The standard sliding loads are assembled in the same way as the standard fixed loads using selected waveguide tube and precise positioning of the flange interface. Operation of the sliding element is by a push/pull mechanism and a locking screw is provided for repetitive measurements.

Standard Rectangular

Specification:
V.S.W.R: See table (based on spot frequency operation)
Material: Brass
Load material: Iron loaded resin
Finish: Blue paint

Operating Frequency Band (GHz)	Waveguide Designation			Max V.S.W.R.	Max Power Watts C.W.	Overall Length “A” (mm)
Operating Frequency Band (GHz)	UK WG	IEC R	E.I.A. WR	Max V.S.W.R.	Max Power Watts C.W.	Overall Length “A” (mm)
2.60 – 3.95	10	32	284	1.01	3	790
3.30 – 4.90	11A	40	229	1.01	2	526
3.95 – 5.85	12	48	187	1.01	2	414
4.90 – 7.05	13	58	159	1.01	2	332
5.85 – 8.20	14	70	137	1.01	1	336
7.05 – 10.0	15	84	112	1.01	1	323
8.20 – 12.40	16	100	90	1.01	0.8	331
10.0 – 15.0	17	120	75	1.01	0.8	321
12.4 – 18.0	18	140	62	1.01	0.6	321
15.0 – 22.0	19	180	51	1.02	0.6	225
18.0 – 26.5	20	220	42	1.02	0.6	107
22.0 – 33.0	21	260	34	1.02	0.6	107
26.5 – 40.0	22	320	28	1.035	0.5	100

Fixed Loads

The waveguide loads devices are manufactured from selected waveguide tube. The flange interface is precisely controlled to offer the optimum performance.

Standard Rectangular

Specification:
Material: Brass
Load material: Iron loaded resin
Finish: Blue paint

Calibration quality fixed loads

Operating Frequency Band (GHz)	Waveguide Designation			Max V.S.W.R.	Max Power Watts C.W.	Overall Length “A” (mm)
Operating Frequency Band (GHz)	UK WG	IEC R	E.I.A. WR	Max V.S.W.R.	Max Power Watts C.W.	Overall Length “A” (mm)
2.60 – 3.95	10	32	284	1.02	5	310
3.30 – 4.90	11A	40	229	1.02	4	225
3.95 – 5.85	12	48	187	1.02	3.5	235
4.90 – 7.05	13	58	159	1.02	3.5	190
5.85 – 8.20	14	70	137	1.02	2	185
7.05 – 10.0	15	84	112	1.02	2	143
8.20 – 12.40	16	100	90	1.02	1.3	138
10.0 – 15.0	17	120	75	1.02	1.3	127
12.4 – 18.0	18	140	62	1.02	1	86
15.0 – 22.0	19	180	51	1.025	1	79
17.7 – 26.5	20	220	42	1.035	0.8	94
22.0 – 33.0	21	260	34	1.035	0.8	67
26.5 – 40.0	22	320	28	1.05	0.6	66

Double Ridge

Specification:
Material: Aluminium
Load material: Iron loaded resin
Finish: Blue paint, iridited flanges

Operating Frequency Band (GHz)	Waveguide Designation	TWS Part Number Max V.S.W.R.	Max Power Watts C.W.	Overall Length “A” (mm)
4.75 – 11.0	WRD475 D24	1.04	11	386
5.8 – 16.0	WRD580 D28	1.04	8	300
6.5 – 18.0	WRD650 D28	1.05	7	252
7.5 – 18.0	WRD750 D24	1.05	7	237
18.0 – 40.0	WRD180 C24	1.06	5	128

High Power Loads

High and medium power loads are based on silicon carbide elements for optimum thermal efficiency. Several sizes of loads per waveguide size may be available depending on the power requirement.

The range of high power waveguide loads is continually being expanded. The power rating depends on the waveguide size, ambient temperatures and the fin area available, (e.g. the two WG17 loads shown below have power ratings of 800W and 500W and the WG10 load 2000W), but for very high power requirements, either multiple load elements and internal power splitters or a custom load element is designed in house for optimum heat distribution. Special designs are available for requirements with extremely high peak powers.

All load elements are made from silicon carbide which is thermally bonded to the heatsink and have a match better than 1.1:1.

The majority of loads have optimum heat dissipation when mounted horizontally, but fin arrangements are also available for vertical mounting - if necessary (at extra cost). Please consult the factory for higher power ratings and support bracketry.

Load sizes vary enormously depending on power dissipation and if forced air or convection is used - but as a very rough guide, the approximate size of a 1kW load using convection would be 220 x 220 x 300mm and a 2kW load 255 x 255 x 550mm

Designs are available for waveguide sizes WG10 to WG22 in various power ratings. Please contact the factory with the waveguide size, power dissipation and frequency range needed (it is often possible to optimise performance over a particular frequency range when very high power loads are needed).

Ordering information

Example: FL 16 S Q Z 402 B

FA
- Product code:
  FL = fixed load
  SL = sliding load
16
- Waveguide size:
  British WG size for rectangular waveguide or MIL spec. WRD size for double ridge waveguide
  e.g. 16 = WG16; 750 = WRD750
S
- Type:
  S = standard
  H = high power
Q
- Paint:
  Z = unpainted (standard)
  Q = TWS blue (preferred)
  B = black
  G grey
Z
- Finish:
  Z = unplated (standard for brass)
  M = passivate (option for brass)
  F = Iridite (preferred for aluminium)
  H = chromate
  A = tin
  B = silver
402
- Flange type
  Last 3 digits from the flange part no.
  e.g. 402 = UBR flange
B
- Material:
  A = aluminium (standard for double ridge)
  B = brass (standard for rectangular)