Attachment

Multiple-channel measurements

Figure 33. 2 and 4-port PIN switches

85331B 1P2T PIN switch (0.045 to 50 GHz)

85332B 1P4T PIN switch (0.045 to 50 GHz)

Note

The 85331B and 85332B do not contain a switch control unit. If your system is configured with an 85330A multiple channel controller, the switch control unit must be ordered separately

(Agilent part number 85331-60061).

The 85331B and 85332B PIN switches offer the ability to switch between test channels quickly. These high-performance PIN switches have 90 dB of isolation, low loss, and a

45 MHz to 50 GHz bandwidth. They are absorptive, providing a good impedance match, which is key to achieving accurate measurements. The switches are small in size and weather resistant. Figure 34 shows a typical configuration with the PIN switches connected to the source antenna and AUT.

Customer supplied

V

Source antenna

Antenna under test

Switch control unit

H

1P2T

PIN switch

1P4T

PIN switch

Switch control unit

From transmit source

To receiver

Figure 34. A typical multiple-channel, multiple-frequency system configuration.

Customer supplied

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Application flexibility

Far-field antenna measurements

These products are ideally suited for antennas with multiple test ports, or applications that require measuring the co- and cross-polarization response. One PIN switch can switch transmit polarization, and a second PIN switch can switch between the separate test ports of the antenna. With this technique, the co- and cross-polarization response of each test port can be measured in one rotation of the antenna.

Near-field antenna measurements

For near-field applications, both the co- and cross-polarized response of an antenna can be measured at multiple frequencies in a single scan across the antenna. For the dual polarized response, a PIN switch can be used to rapidly switch between the two probe polarizations.

Radar cross-section measurements

For Radar cross-section (RCS) applications, the ability to rapidly switch transmit and receive polarization allows full polarimetric RCS measurements to be made quickly and easily.

Complex switch configurations

Complex PIN switch trees with multiple outputs can be easily configured. Figure 35 shows conceptually how multiple PIN switches can be configured. Configurations such as these are used in making phased-array antenna measurements.

Figure 35. Example 1P16T switch configuration constructed from modular components

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Switch specifications

Table 13. 85331/32B specifications

Model number

85331B

1P2T

85332B

1P4T

Frequency ON S21 OFF S21 OFF S22 ON S22 ON S11 Max power range (GHz) (db) (db) (db) (db) (db) (dBm)

0.045 to 0.5

–2.0

0.5 to 18 –4.5

18 to 26.5

26.5 to 40

–6.0

–10.0

–85

–90

–90

–85

–19.0

–19.0

–12.5

–10.0

–10.0

–10.0

–6.0

–6.0

–10.0

+27

–10.0

+27

–5.5

–4.5

+27

+27

0.045 to 0.5

–2.0

0.5 to 18 –4.5

18 to 26.5

26.5 to 40

–7.0

–12.0

–85

–90

–90

–85

–19.0

–19.0

–12.5

–10.0

–9.0

–9.0

–5.0

–4.5

–10.0

+27

–10.0

+27

–5.5

–4.0

+27

+27

On S11

On S21

Off S21

On

Off

Off

Off

On S22

Off S22

Figure 36. Switch port match definitions for switch on/off states

Other information

Connectors on PIN switch

All RF ports are 2.4 mm female (a 2.4 mm male to 3.5 mm female adapter is provided for all RF ports). The bias connector mates with LEMO 7 pin plug #FGG.1K.307.CLAC60.

Drive levels

Refer to Figure 37 for pin locations. Note the notch and red mark on the bias connector outer ring are used for reference.

To turn ON a port, supply a –7VDC (± 0.35V) bias voltage. Current is approximately 41 mA.

To turn OFF a port, supply a +6.3VDC (± 0.32V) bias voltage. Current is approximately 95 mA.

Only one port can be turned on at a time, or all ports can be off.

The total current is approximately 400 mA for 85332B, 200 mA for 85331B with all ports off.

Pin 7

Pin 1 Pin 6

Pin 2

Pin 5

Pin 3 Pin 4

Note

Agilent channel partners can provide the control, interface and timing required for these

PIN switches.

Figure 37. Bias connector pin locations (enlarged)

Pin 1 = Port 1 on/off bias

Pin 2 = Port 2 on/off bias

Pin 3 = Port 3 on/off bias (not connected for 85331B)

Pin 4 = Port 4 on/off bias (not connected for 85331B)

Pin 5 = Common/ground (0VDC)

Pins 6,7 = Not Connected

Size and weight

65 mm (2.6 in) x 70 mm (2.75 in) x 70 mm (2.75 in)

Approximately 0.35 kg (0.7 lbs)

Environmental

Operating conditions

Temperature –20 to 55 °C (–4 to 131 °F)

Humidity 5 to 95% at 40 °C or less (non-condensing)

Non-operating conditions

Temperature –40 to 70 °C (–40 to 158 °F)

Humidity 5 to 95% at 65 °C or less (non-condensing)

Power

Supplied by external controller

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