Version 07.00 February 2005 Attenuators and Matching Pads, Terminations 175 mW to 1000 W / DC to 18 GHz Data sheet Attenuators As a rule, the reflection coefficient of ¸DNF (1 W/2 W) ple termination. The power applied can commercial signal generators or test be accurately determined from the pow- receivers is about 20 %. This value may Small attenuation error, largely frequency- er measured at the test output and from be too high for precise measurements. independent attenuation and low VSWR the known attenuation. Moreover, a fre- To improve matching, an attenuator are special features of the Attenuators quency counter or analyzer can be con- should be inserted after the signal ¸DNF. They are sturdy, immune to nected to the test output. generator output and another one ahead vibration (complying with MIL-A-3933), of the receiver input. In this way, the only slightly temperature-dependent reflection coefficients of both the gen- and resistant to short-term overloading. ¸RBU (50 W/100 W) erator and the receiver will be reduced. The Attenuators ¸DNF are equipped with N connectors (male, female) and The High-Power Attenuators ¸RBU Signal generators often do not have a are available with 3/6/10/20/30 dB with 3/6/10/20/30 dB attenuation are defined source impedance. In these attenuation. ideal for applications in the frequency cases, it is advisable to insert a 16 dB range up to 2 GHz, which is of particular (10 dB + 6 dB) attenuator. The internal interest for mobile radio measurements. reflection coefficient of such a signal High-power attenuators The attenuators are characterized by source is thus reduced to about 3 %, low VSWR and a small attenuation error which is small enough for accurate High-power attenuators are used as throughout the entire frequency range. measurements. dummy loads for transmitters and am- Due to the large-area heat sink, the plifiers in the frequency range 0 Hz to attenuator surface temperature does not Attenuators can also be used as refer- 6 GHz. Their constant attenuation per- rise above 75 °C (at 25 °C ambient tem- ence standards for attenuation and gain mits harmonics measurements to be perature) even under full load. measurements in line with the substitu- allows on transmitters, TV transposers tion method, for precise voltage division, and other equipment. Thus, the high- and as buffers to isolate test circuits. power attenuator is superior to a sim- ¸DNF ¸RBU100 ¸RBU50 20 dB 0 1 GHz 2 ¸RBU50 Typical attenuation (top) and VSWR (bottom) characteristics of the ¸RBU100 1 Attenuators ¸RBU 50 and ¸RBU 1000 (attenuation 20 dB) 0 1.5 GHz 2 2 Attenuators, Matching Pads, Terminations 0.2 dB/div 0.2 dB/div ¸RDL 50 (50 W) The High-Power Attenuator ¸RDL 50 is suitable for the frequency range up to 6 GHz. A special feature is its con- stant low attenuation over the entire ¸RDL 50, 50 W frequency range. ¸RBS 1000 (1000 W) The Attenuator ¸RBS 1000 is of planar design using special manufac- turing techniques. The energy-absorb- ing thin-film layer is deposited on a ceramic substrate, so the heat generated can directly dissipate without having to penetrate any heat-insulating air layer. The result is a considerable reduc- tion in size while maintaining the same power-handling capacity as conventional attenuators. ¸RBS 1000, 1000 W 25°C 1000 160 ¸RBS1000 ¸RBS1000 55°C 800 120 80°C 600 80 400 40 20 0 0 0 200 400 600 800 1000 0 200 400 600 800 1000 Frequency in MHz Power in W Power handling capacity as a function of frequency and ambient Overtemperature as a function of the power applied temperature Attenuators, Matching Pads, Terminations 3 Power in W Temperature in °C Terminations ¸RNA and ¸RNB (1 W) The 75 Ω and the 50 Ω Terminations ¸RNA and ¸RNB are versatile line terminations used in 3/7 mm coaxi- al line systems. A special feature is their very low reflection over a wide frequen- cy range. The use of high-grade metal- film resistors provides a continuous pow- er-handling capacity of 1 W. ¸RNB ¸RNA The Precision Termination ¸RNA features extremely low VSWR over the ¸RNB entire frequency range from DC to 3 GHz 1.20 and is, therefore, ideal for measurement Limit value 1.15 applications. The Termination ¸RNB is for general use in the frequency range Typical 1.10 characteristic DC to 4 GHz. 1.05 1 0 1 2 3 4 Frequency in GHz Limit value and typical VSWR characteristics of the ¸RNB ¸RAU (100 W) The Termination ¸RAU is mainly used as a dummy antenna for mobile and stationary transmitters. Its low VSWR makes it also suitable for TV equipment. ¸RAU 4 Attenuators, Matching Pads, Terminations VSWR Feedthrough Terminations, Matching Pads For the precise measurement of inser- Voltage transformation is defined as the The unidirectional Matching Pad tion loss and phase shift, the signal gen- ratio in dB of the voltages at the con- ¸RAZ is particularly suitable for the erator, DUT and receiver must be well nectors: matching of signal generators. Signal matched to one another. Matching pads and sweep generators have in most V 50Ω allow systems of different characteristic cases a source impedance of 50 Ω. They A =20⋅lg =4dB 50Ω→75Ω V impedance to be connected without in- 75Ω can be adapted to feed 75 Ω systems by volving costly retrofits. means of the Matching Pad ¸RAZ V 75Ω A =20⋅lg =7.5dB involving extremely low power loss. The 75Ω→50Ω V 50Ω output voltage displayed on the gen- erator is also valid for the 75 Ω system Feedthrough Terminations without requiring correction. ¸RAD (500 mW), Power attenuation is the same in both ¸RAD 50 directions: 2 V ⋅50Ω 75Ω The Feedthrough Terminations A =10⋅lg =5.72dB p 2 ¸RAD are used for 75Ω⋅V 50Ω matching 50 Ω lines to measuring equipment of Signal generator ¸RAM DUT ¸RAM Receiver high input impedance (e.g. V g oscilloscopes or tuners Z Z s rec V rec 50 Ω 43.3 Ω 43.3 Ω 50 Ω with 1 MΩ input imped- ance). The feedthrough ter- minations must be plugged 50 Ω : 75 Ω 75 Ω 75 Ω : 5 0 Ω directly onto the input con- Two Matching Pads ¸RAM to match a 75 Ω DUT to a signal generator and nector of the measuring receiver, each having a characteristic impedance of 50 Ω device to ensure optimum matching. Signal generator Cable of desired length ¸RAZ V g Z s Z = 75 Ω 50 Ω 25 Ω s Matching Pads ¸RAM and ¸RAZ (2 W) 50 Ω The bidirectional By connecting a Matching Pad ¸RAZ consisting of a 25 Ω series resistor, a signal generator with a 50 Ω output has an output impedance of 75 Ω Matching Pad ¸RAM provides the match be- tween 50 Ω and 75 Ω 5.87 impedance systems in 5.85 both directions up to 5.80 2.7 GHz, causing minimum attenuation. Care should Typical characteristic 5.75 be taken that ports with the same characteristic 5.70 impedances be connected 5.67 to one another. 0 0.5 1 1.5 2 2.5 2.7 Frequency in GHz Frequency response and error limits of power attenuation of the Matching Pad ¸RAM Attenuators, Matching Pads, Terminations 5 Attenuation in dB 86.6 Ω 86.6 Ω 6 Attenuators, Matching Pads, Terminations Specifications/Ordering information Type Characteristic Power rating Nominal attenuation Frequency range VSWR Attenuation Max. peak Connectors Dimensions, weight Order No. impedance (N = nominal value) pulse voltage ¸DNF 1) 2) 272.4010.50 50 Ω 2 W 3 dB 0 Hz to 12.4 GHz ≤1.1 (up to 4 GHz) N ±0.3 dB to 8 GHz N male, N female 20.5 mm ∅ × 55 mm, 2) ≤1.2 (up to 10 GHz) N ±0.5 dB to 12.4 GHz 69 g 272.4110.50 6 dB ≤1.25 (up to 12.4 GHz) 1) 2) 272.4210.50 1 W 10 dB N ±0.3 dB to 8 GHz 2) N ±0.6 dB to 12.4 GHz 2) 272.4310.50 20 dB N ±0.5 dB to 4 GHz 2) N ±0.6 dB to 8 GHz 2) N ±0.8 dB to 12.4 GHz 2) 272.4410.50 30 dB N ±1 dB to 12.4 GHz ¸RBU 50 3) 4) 1073.8895.03 50 Ω 50 W 3 dB 0 Hz to 2 GHz ≤1.1 N ±0.5 dB 5 kW/5 µs N male, N female to 180 mm × 77 mm × 90 mm, MIL-STD-348 A 0.8 kg 1073.8895.06 6 dB 1073.8895.10 10 dB 1073.8895.20 20 dB 1073.8895.30 30 dB ¸RBU 100 5) 4) 1073.8820.03 50 Ω 100 W 3 dB 0 Hz to 2 GHz ≤1.1 N ±0.5 dB to 1.5 GHz 5 kW/5 µs N male, N female to 236 mm × 140 mm × 4) N ±0.75 dB to 2 GHz MIL-STD-348 A 141 mm, 2.8 kg 1073.8820.06 6 dB 1073.8820.10 10 dB 1073.8820.20 20 dB 1073.8820.30 30 dB ¸RDL 50 1035.1700.52 50 Ω 50 W (input), 20 dB 0 Hz to 6 GHz ≤1.15 (up to 2 GHz) N ±0.5 dB 2 kW/5 µs N male, N female 114 mm × 89 mm × 68 mm, 1) 10 W (output) ≤1.25 (up to 6 GHz) 0.5 kg ≤1.4 (up to 6 GHz) ¸RBS 1000 6) 207.4010.55 50 Ω 1000 W 40 dB 0 Hz to 0.4 (1) GHz ≤1.2 input N ±1 dB 10 kW/1 µs N female 500 mm × 285 mm × see Fig. on page 3 see Fig. on page 3 152 mm, 12 kg High-Power Attenuators Attenuators Attenuators, Matching Pads, Terminations 7 Type Characteristic Power rating Nominal attenuation Frequency range VSWR Attenuation Max. peak Connectors Dimensions, weight Order No. impedance (N = nominal value) pulse voltage ¸RNA 1) 1028.4994.72 75 Ω 1 W 0 Hz to 3 GHz ≤1.02 N male 21 mm ∅ × 46 mm, 65 g ¸RNB 1) 272.4910.50 50 Ω 1 W , 0 Hz to 4 GHz ≤1.05 (up to 1 GHz) N male 20.5 mm ∅ × 35 mm, 2 W peak ≤1.1 (up to 2 GHz) 36 g ≤1.2 (up to 4 GHz) ¸RAU 7) 200.0019.55 50 Ω 100 W 0 Hz to 2 GHz ≤1.05 (0 Hz to 1 GHz) 2 kV N female 95 mm × 152 mm × 235 mm, ≤1.1 (1 Hz to 1.5 GHz) 2 kg ≤1.4 (1.5 Hz to 2 GHz) ¸RAD 8) 9) 289.8966.00 50 Ω 500 mW 0 Hz to 1 GHz ≤1.05 (up to 0.1 GHz) BNC male, BNC female 14.5 mm ∅ × 50.5 mm, ≤1.1 (up to 0.5 GHz) 22 g ≤1.2 (up to 1 GHz) ¸RAD 50 8) 9) 844.9352.02 50 Ω ±0.1 % 2 W 0 Hz to 500 MHz ≤1.1 (up to 200 MHz) BNC male, BNC female 15.3 mm ∅ × 50.5 mm, 9) ≤1.25 (up to 500 MHz) 22 g ¸RAM 10) 358.5414.02 50 Ω → 75 Ω 2 W 5.72 dB 0 Hz to 2.7 GHz ≤1.06 (up to 2 GHz) 5.72 dB +0.15/–0.05 dB N male, N female 21 mm ∅ × 73 mm, ≤1.2 (up to 2.7 GHz), at 75 Ω end 105 g both terminals ¸RAZ 10) 358.5714.02 50 Ω → 75 Ω 2 W 1.76 dB 0 Hz to 2.7 GHz ≤1.06 (up to 2 GHz) 1.76 dB ±0.2 dB N male, N female 21 mm ∅ × 73 mm, ≤1.2 (up to 2.7 GHz), at 75 Ω end 105 g at 75 Ω end 1) At a max. ambient temperature of 30 °C; decreasing linearly to 0 W at 130 °C (¸RDL 50: 125 °C). 2) Attenuation change at a temperature change of 1 K: ≤0.0001 dB/dB. At a load change of 1 W: ≤0.001 dB/dB. 3) Input overload capacity up to 150 W at 20 °C ambient temperature (max. 10 min); output overload capacity up to 20 W. 4) Attenuation change at a temperature change of 1 K: ≤0.0004 dB/dB. At a load change of 1 W: ≤0.0001 dB/dB. 5) Input overload capacity up to 250 W at 20 °C ambient temperature (max. 10 min); output overload capacity up to 20 W. 6) The frequency response of the attenuation is specified on a label on the ¸RBS 1000 with a measurement accuracy of 0.1 dB. 7) Overload capacity 100 % (max. 5 s). 8) Continuous power rating up to a maximum ambient temperature of 70 °C; decreasing linearly to 0 W at 130 °C. 9) Measured with open-circuit output. 10) Ambient temperature 25 °C. Matching Pads Feedthrough Terminations Terminations Certified Quality System Certified Environmental System ISO 9001 ISO 14001 DQS REG. NO 1954 QM DQS REG. NO 1954 UM www.rohde-schwarz.com Europe: Tel. +49 1805 12 4242, e-mail: customersupport@rohde-schwarz.com · North America: Tel. +1 410-910-7988, e-mail: customer.support@rsa.rohde-schwarz.com Asia: Tel. +65 68463710, e-mail: customer-service@rssg.rohde-schwarz.com ¸is a registered trademark of Rohde & Schwarz GmbH & Co. KG · Trade names are trademarks of the owners · Printed in Germany (Pe sk/ch) PD 0758.1906.32 · Attenuators and Matching Pads, Terminations · Version 07.00 · February 2005 · Data without tolerance limits is not binding · Subject to change