Here is a look at the most popular technical articles (by number of page views) for 2016. About half are cover stories but several are older, classic articles from many years ago (including #1).

1. On the Direct Conversion Receiver -- A Tutorial
   Ashkan Mashhour, William Domino, Norman Beamish
    
2. Comparing Microstrip and Grounded Coplanar Waveguide
   John Coonrod, Rogers Corporation
    
3. A General Design Procedure for Bandpass Filters Derived from Low Pass Prototype Elements
   K.V. Puglia 
    
4. History of Wireless Communications
   Pat Hindle, Editor, Microwave Journal 
    
5. The 5G mmWave Radio Revolution       
    Amitava Ghosh, Nokia Bell Labs
    
6. Get Your GaN Here: RF GaN Foundry Survey       
   Pat Hindle, Gary Lerude and Richard Mumford
    
7. Basic Rules for Anechoic Chamber Design, Part One: RF Absorber Approximations
   Vince Rodriguez
    
8. Design of a Planar Microstrip Balun at S-band
    Jwo-Shiun Sun, Tsung-Lin Lee 
    
9. Axial Ratio Measurements of Single Circularly Polarized Antennas
   Robert Gunnels 
    
10. Eye on 802.11ax: What It Is and How to Overcome the Design and Test Challenges It Creates
    Michael Wohlert, Sang-Kyo Shin and Xiang Feng, Keysight Technologies
     
11. 3D Integration and Packaging of mmWave Circuits and Antennas: Opportunities and Challenges
     Ossama El Bouayadi, Yann Lamy, Laurent Dussopt and Gilles Simon, CEA-Leti
     
12. Going Green: High Efficiency GaN Amplifiers
     Patrick Hindle
     
13. Metamaterial Advances for Radar and Communications
    Eli Brookner, Raytheon Co. (Retired) 
     
14. A Practical Guide to the Design of Microstrip Antenna Arrays
    Roger Hill 
     
15. DC to 110 GHz Measurements in Coax Using the 1 mm Connector
    Keith Howell and Ken Wong