For further information and resources we suggest these sites, but there are of course many more great places to find information about RF development and measurement techniques.
A review and comparison of the MegiQ VNA-0440, Rohde & Schwarz ZVL6 and MiniVNA. Same in Chinese: 低价网络分析仪的时代来临了.
Extensive explanation of antenna types and theory.
This is free software to calculate higher order matching circuits for antennas. Simply export the measurements from our VNA software in TouchStone format and have Aytune calculate wideband matching circuits.
Calculators, series about microwaves and antennas.
A comprehensive listing of RF design, news, products, manufacturers and other information.
Harald Naumann has written an excellent 'cookbook' on how to develop wireless -IOT- devices and antennas.
This website has a all kind of information about circuits and design. This link leads you to the RF page.
Website with industry links that may be of interest.