Double Ridge Waveguide Terminations

Frontgrade offers a wide range of precision double ridge waveguide terminations to absorb energy and prevent signal loss within your designs.

With a variety of models supporting virtually all waveguide applications, Frontgrade Waveguide Terminations provide best-in-class VSWR performance and support a variety of frequency ranges.

Frontgrade's Double Ridge Terminations portfolio includes low power terminations (precision and short length); low-medium power terminations; medium power terminations and high powered terminations (air cooled and water cooled). We also offer mismatched high power terminations for double ridge waveguides.

Low Power Precision Terminations

Frontgrade's Low Power Precision Terminations are constructed of 6061 aluminum bodies and flanges. They use custom machined load elements for optimum electrical performance. VSWR is less than 1.05 for most models.

Model Number	Waveguide Size	Frequency Range (GHz)	Power (Watts)	Dimension A
PLPT180	WRD - 180C24	18.00 - 40.00	2	4.00
PLPT110	WRD - 110C24	11.00 - 26.50	2	6.00
PLPT750	WRD - 750D24	7.50 - 18.00	5	8.80
PLPT650	WRD - 650D28	6.50 - 18.00	5	8.80
PLPT580	WRD - 580D28	5.80 - 16.00	5	8.80
PLPT475	WRD - 475D24	4.75 - 11.00	5	12.80
PLPT350	WRD - 350D24	3.50 - 8.20	10	13.80
PLPT250	WRD - 250D30	2.60 - 7.80	10	15.00

Low-Medium Power Terminations

Frontgrade's Low-Medium Power Terminations feature aluminum bodies and flanges while using custom machined load elements for optimum electrical performance. This series of terminations is designed for low-medium power inputs, with typical VSWR of less than 1.15.

Model Number	Waveguide Size	Frequency Range (GHz)	PWR.Max (Watts-CW):A	PWR.Max (Watts-CW):B	Air Flow (CFM)	Dimension A
LMPT180	WRD - 180C24	18.00 - 40.00	57	113.00	35	4.50
LMPT110	WRD - 110C24	11.00 - 26.50	82	165.00	35	6.63
LMPT750	WRD - 750D24	7.50 - 18.00	125	250.00	35	9.50
LMPT650	WRD - 650D28	6.50 - 18.00	127	250.00	35	9.50
LMPT580	WRD - 580D28	5.80 - 16.00	149	273.00	35	9.50
LMPT475	WRD - 475D24	4.75 - 11.00	326	652.00	70	12.25
LMPT350	WRD - 350D24	3.50 - 8.20	484	938.00	70	13.75
LMPT250	WRD - 250D30	2.60 - 7.80	519	1005.00	70	13.75

Medium Power Terminations

Frontgrade's Medium Power Terminations are manufactured with heavy wall 6061 waveguide and extruded heat sink material. The load material is custom ground silicon carbide tapered for optimum VSWR response of less than 1.15 while maintaining moderate power handling characteristics.

Model Number	Waveguide Size	Frequency Range (GHz)	PWR.Max (Watts-CW):A	PWR.Max (Watts-CW):B	Air Flow (CFM)	Dimension:A	Dimension:B	Dimension:C
MPT180	WRD - 180C24	18.00 - 40.00	65	124	35	4.50	0.88	1.14
MPT110	WRD - 110C24	11.00 - 26.50	92	176	35	6.63	1.11	1.37
MPT750	WRD - 750D24	7.50 - 18.00	250	480	35	9.50	1.45	2.43
MPT650	WRD - 650D28	6.50 - 18.00	254	480	35	9.50	1.45	2.43
MPT580	WRD - 580D28	5.80 - 16.00	263	500	35	9.50	1.45	2.48
MPT475	WRD - 475D24	4.75 - 11.00	441	833	70	12.25	1.94	3.63
MPT350	WRD - 350D24	3.50 - 8.20	517	1000	70	13.75	2.77	4.35
MPT250	WRD - 250D30	2.60 - 7.80	682	1364	70	13.75	2.77	4.38

High Power Terminations

Frontgrade's High Power Terminations utilize heavy wall 6061 aluminum and extruded heat sink material construction. The load element is custom ground silicon carbide shaped for optimum power handling and heat transfer while maintaining 1.15 maximum VSWR.

Model Number	Waveguide Size	Frequency Range (GHz)	PWR.Max (Watts-CW):A	PWR.Max (Watts-CW):B	Air Flow (CFM)	Dimension:A	Dimension:B	Dimension:C
HPT180	WRD - 180C24	18.00 - 40.00	90	128	35	4.50	2.24	2.08
HPT110	WRD - 110C24	11.00 - 26.50	128	232	35	6.63	2.72	2.67
HPT750	WRD - 750D24	7.50 - 18.00	350	595	35	9.50	3.8	3.43
HPT650	WRD - 650D28	6.50 - 18.00	357	595	35	9.50	3.83	3.43
HPT580	WRD - 580D28	5.80 - 16.00	366	595	35	9.50	3.89	3.48
HPT475	WRD - 475D24	4.75 - 11.00	625	1062	70	12.25	4.65	4.08
HPT350	WRD - 350D24	3.50 - 8.20	789	1500	70	13.75	5.38	4.59
HPT250	WRD - 250D30	2.60 - 7.80	1000	1500	70	13.75	5.56	4.62

High Power Air Cooled Terminations

Frontgrade's High Power Air Cooled Terminations are composed of heavy wall 6061 aluminum and extruded heat sink material. The load element is custom ground silicon carbide shaped for optimum power handling and heat transfer while maintaining 1.15 maximum VSWR. This series of terminations is designed with a cooling fan to enhance heat dissipation and increase power handling performance.

Model Number	Waveguide Size	Frequency Range (GHz)	Air Flow (CFM)	PWR.Max (Watts-CW)	Dimension:A	Dimension:B	Dimension:C
HPTAC180	WRD - 180C24	18.00 - 40.00	35	128	7.5	3.14	3.14
HPTAC110	WRD - 110C24	11.00 - 26.50	35	232	9.63	3.14	3.14
HPTAC750	WRD - 750D24	7.50 - 18.00	35	595	12.5	3.80	3.43
HPTAC650	WRD - 650D28	6.50 - 18.00	35	595	12.5	3.83	3.43
HPTAC580	WRD - 580D28	5.80 - 16.00	35	595	12.5	3.89	3.48
HPTAC475	WRD - 475D24	4.75 - 11.00	70	1062	15.85	4.69	4.69
HPTAC350	WRD - 350D24	3.50 - 8.20	70	1500	17.35	5.38	4.69
HPTAC250	WRD - 250D30	2.60 - 7.80	70	1500	17.35	5.56	4.69

High Power Water Cooled Terminations

Frontgrade's High Power Water Cooled Terminations are comprised of aluminum bodies and flanges and use custom machined silicon carbide load elements shaped for optimum power handling and heat transfer. VSWR is maintained at 1.15 maximum. This series of terminations is designed with input/output ports for water circulation, to enhance heat dissipation and increase power handling performance.

Model Number	Waveguide Size	Frequency Range (GHz)	PWR.Max (Watts-CW)	Dimension:A	Dimension:B	Dimension:C	Dimension:D
HPTW180	WRD - 180C24	18.00 - 40.00	168	4.50	1.40	1.00	0.50
HPTW110	WRD - 110C24	11.00 - 26.50	300	6.63	1.40	1.25	0.50
HPTW750	WRD - 750D24	7.50 - 18.00	675	9.50	1.75	1.25	0.50
HPTW650	WRD - 650D28	6.50 - 18.00	675	9.50	1.75	1.25	0.50
HPTW580	WRD - 580D28	5.80 - 16.00	675	9.50	1.75	1.25	0.50
HPTW475	WRD - 475D24	4.75 - 11.00	938	12.25	1.75	1.25	1.00
HPTW350	WRD - 350D24	3.50 - 8.20	1000	13.75	2.00	1.25	1.00
HPTW250	WRD - 250D30	2.60 - 7.80	1000	13.75	2.00	1.25	1.00

High Power Mismatched Terminations

Frontgrade's High Power Mismatched Terminations feature constructed aluminum waveguide and extruded heat sink material. The load element is custom machined for optimum electrical performance. These units are designed for ultra-flat return loss and are available in four standard configurations.

Model Number	Waveguide Size	Frequency Range (GHz)	Air Flow (CFM)	PWR.Max (Watts-CW):A	PWR.Max (Watts-CW):B	Dimension:A	Dimension:B	Dimension:C
HPM180	WRD - 180C24	18.00 - 40.00	35	90	128	4.50	2.24	2.08
HPM110	WRD - 110C24	11.00 - 26.50	35	128	232	6.63	2.72	2.67
HPM750	WRD - 750D24	7.50 - 18.00	35	350	595	9.50	3.80	3.43
HPM650	WRD - 650D28	6.50 - 18.00	35	357	595	9.50	3.83	3.43
HPM580	WRD - 580D28	5.80 - 16.00	35	366	595	9.50	3.89	3.48
HPM475	WRD - 475D24	4.75 - 11.00	70	625	1062	12.25	4.65	4.08
HPM350	WRD - 350D24	3.50 - 8.20	70	789	1500	13.75	5.38	4.59
HPM250	WRD - 250D30	2.60 - 7.80	70	1000	1500	13.75	5.56	4.62