PACIFIC MILLIMETER PRODUCTS

BROADBAND DETECTORS

These waveguide bandwidth detectors use silicon beam lead diodes on a planar stripline circuit to obtain an extremely rugged and compact device. Most millimeter wave broadband detectors have very poor VSWR due to the difficulty in obtaining a good wideband impedance match to the diode. To overcome this problem, these detectors utilize two diodes and an internal matched termination and 3 dB hybrid as shown below. This circuit allows a VSWR of 2.0 or better over a full waveguide bandwidth for most of these detectors. Detectors for waveguides WR-8 and smalleruse a single zero bias GaAs diode. The high sensitivity zero bias GaAs diodes can also be special ordered for use at lower frequencies when highest sensitivity is required.

SPECIFICATIONS

MODEL	FREQUENCY (GHz)	SENSITIVITY (mV/mW)min*	WAVEGUIDE	FLANGE COMPATIBILITY	DIM. (INCHES)	FLATNESS (+/- dB max)	VSWR (MAX)
KaD	26.5-40	1000	WR-28	UG-599/U	.8x.16x.24	2	2
QD	33-50	750	WR-22	UG-383/U	1.125x1.225x.2	2	2
UD	40-60	750	WR-19	UG-383/U (MOD)	1.125x1.125x.2	2	2
VD VDH	50-75	450	WR-15	UG-385/U	.8x1.1x.2 .8x1.1x.3	2	2
ED	60-90	250	WR-12	UG-387/U	.75x.1.0x.2	2	2
WD WDH	75-110	250	WR-10	UG-387/U (MOD)	.75x.98x.2 75x.98x.31	2	2.5
FD**	90-140	1100 (TYP)	WR-8	UG-387/U (MOD)	.75x.75x.2
DD**	110-170	900 (TYP)	WR-6	UG-387/U (MOD)	.75x.75x.2
GD**	140-220	250 (TYP, estimated)	WR-5	UG-387/U (MOD)	.75x.85x.2
YD**	170-260	200 (TYP, estimated)	WR-4	UG-387/U (MOD)	.75x.75x.2
HD**	220-325	150 (TYP, estimated)	WR-3	UG-387/U (MOD)	.75x.75x.2

^{Maxumum RF input power 100 mW.}
¹ Models VDH and WDH are ruggedized, gold plated detectors.

* Detector sensitivity is measured into 1 Megohm load and is measured in the square law region.

** These detectors are single diode detectors using a zero bias GaAs planar doped barrier diode. Sensitivities are estimated above 140 GHz due to lack of calibrated power sensors above 140 GHz.

A detector adapter (model DA) is available to match these detectors to the square law saturation characteristics of the Wiltron 560 and 562 Scalar Network Analyzers. These detectors also can be used with HP 8757 scalar network analyzers utilizing HP 85025C detector adapters.