After my first antenna design project I was motivated to expand my skills by learning new tools. Thus, I chose to design a simple patch array for L-band weather satellite reception using CST and Keysight ADS.

L-band patch array

I started by designing a single patch antenna in CST (and actually also HFSS, but they provided similar results), and optimized the dimensions and feed inset for my desired frequency of operation.

Feed network design in ADS

Next, I designed a feed network in ADS where I incorporated quater wave transformer sections for optimal return loss at the input of the network.

The patches and feed network were then combined in a complete model in CST, where I checked that the antenna was still tuned properly.

Design in CST

I manufactured the antenna using PCBWay, and once I received it, I compared the simulated and measured radiation pattern and return loss. Both results can be seen below.

Return loss comparison

Radiation pattern comparison

Finally, I tested the antenna using a Nooelec GOES+ SAWbird LNA and my Airspy mini SDR.

Array in-use

Below, the reception of HRPT from NOAA-18 can be seen. The carrier is strong, but the sidebands is right on the limit of being decodable.

NOAA-18 reception

I look forward to using Keysight ADS in more RF projects in the future!