Measurement (Probe) Antennas

The measurement antenna paired with the device under test (DUT) creates the over-the-air path for the wireless device. In The Howland Company's distributed axis systems, the measurement antenna mounts on the theta boom and is connected via RF cables to the power measurement device(s) and/or base station simulator.

Desirable characteristics for the measurement antenna include:

  • Dual linear polarization
  • Light weight
  • Good port-to-port isolation
  • Low cross polarization
  • Low return loss
  • Smooth, predictable main lobe performance

Three different models are available. All are dual polarized quad-ridged designs have low cross polarization, low return loss and good port to port isolation.

  QR-1 guad-ridge horn probe antenna in a Model 4100 Wireless Test Lab

QR Series Broadband Horn Antennas

The Model QR-1 is a broadband, dual polarized quad-ridged horn. It operates from 700 MHz to 10 GHz. It is compatible with all models of Howland Wireless test Labs with the exception of the Model 2100.

The Model QR-3A is similar to the Model QR-1 but is designed to operate from 6 GHz down to 400 MHz. It can be used as the measurement antenna in the Model 4100 and Model 4800  Wireless Test Labs.

The Model QR-4 is very similar to the QR-1 but it has been optimized for small size and light weight. The return loss is slightly higher than the QR-1 and its pattern is not quite as directive. However, it achieves performance that is very close to that of the Model QR-1 in a much smaller package. It is compatible with all models of Howland Wireless Test Labs.

  QR-1 with QR-4 and QR-3 broadband horn antennas.
QR-1 (center) with QR-4 (left) and QR-3 broadband
horn antennas.
QR Series Specifications

Characteristic

QR-1

QR-3A

QR-4

Typical

Specified

Typical

Specified

Typical

Specified

Frequency Range (MHz)

700-10000

700-10000

400-6000

400-6000

700-10000

700-10000

Gain

6dBi

Not specified

6dBi

Not specified

6 dBi

Not specified

Efficiency

75%

Not specified

75%

Not specified

75%

Not specified

Cross Polarization Isolation

>20dB

>20dB

>20dB

>20dB

>20dB

>20dB

Return Loss

>10dB

>5dB

>10dB

>5dB

>10dB

>5dB

Length

12 in
(30cm)

Not specified

12.6 in
(32cm)

Not specified

8 in(20cm)

Not specified

Weight

5 lbs
(2.3 kg)

Not specified

10.5 lbs
(4.8 kg)

Not specified

3 lbs
(1.4 kg)

Not specified

Additional Information:

Download PDF Model QR-1 Reference Document
Download PDF Model QR-1 Data Sheet
Download PDF Model QR-3A Data Sheet
Download PDF Model QR-4 Data Sheet