Measurement(Probe)AntennasQR-4测量(探针)天线

Measurement (Probe) Antennas QR-4测量(探针)天线
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 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.