There are some old articles in the following list that can't be read at this moment.
Thank you for understanding.

Date
Subject of Article
Link to
Jun.,19, 2019 If we understand Impedance and Resonance, we can press Points of Antenna Design.
Website
May,19, 2019 If we understand Ground, we can understand Antenna and Noise well.
Website
Apr.,19, 2019 It doesn't seem to be the only Electromagnetism to reconsider the Behavior of Radio Waves.
Website
Apr.,17, 2019 Gadget 5G/IoT System
Website
Dec.,14, 2018 Small Antenna Design
Website
Mar.,15, 2018 Progress of Antenna Design
Website
Aug.,24, 2017 Antenna Design for Automotive
Website
Mar.,8, 2017 Electrodynamics is NOT so difficult.
Website
Jan. 25, 2016 The Trick to learn how to Design the Antenna.
Website
Sep.,18, 2015 Vol. 6(Final), How to measure Characteristics of Antennas
Website
Aug.,19, 2015 Vol. 5, Spiral Ring Antenna and UWB Antennas
Website
Jul.,17, 2015 Vol. 4, How to design a Patch Antenna on a PCB
Website
Jun.,19, 2015 Vol. 3, How to tune Antenna
Website
Jun.,10, 2015 The Maxwell's equation is not difficult.
Website
Jun.,1, 2015 The interest to 'Basis' was re-recognized.
Website
May 27, 2015 Easy to understand 'Complex Plane' and 'Eulerian Description' Website
May 21, 2015 Easy to understand 'Electromagnetism' Website
May 19, 2015 Vol. 2, Propagation and Antenna Technical Term Website
Apr. 19, 2015 Vol. 1, Basic Electromagnetism for RF Engineers Website
Jun. 25, 2012 #9 : Excellent Wireless Engineer Website
Jun. 18, 2012 #8 : (13) Certification --- (16) Mass Production Website
Jun. 11, 2012 #7 : (9) Detail Design --- (12) Pre Production Website
Jun. 4, 2012 #6 : (5) Simulation --- (8) Evaluation Website
May 28, 2012 #5 : (4) Design Each Block (2) Website
May 21, 2012 #4 : (4) Design Each Block (1) Website
May 14, 2012 #3 : (3) Level Diagram Website
May 7, 2012 #2 : (1) Product Planning --- (2) Outline Design Website
Apr. 30, 2012 #1 : 16 Processes of Producing Wireless Equipment Website
Apr. 30, 2012 16 Processes of Producing Wireless Equipment Website
Feb. 9, 2011 Human Body Communication Website
May 12, 2011 Allergy of Electricity-and-magnetism ? Website
Sep. 17, 2009 Human Body Communication AMPLET developed a Prototype for Health Care Application Website
Jun. 17, 2009 Human Body Communication Application Medical Treatment and Health Care Application with High Expectation Website
Apr. 13, 2009 Without IC Card, AMPLET developed HBC ID System Prototype Website
Apr. 7, 2009 Starting up "Human Body Communication" (2) Website
Apr. 6, 2009 Human Body Communication Technology Website
Apr. 6, 2009 Starting up "Human Body Communication" (1) Website
Apr. 2, 2009 'Human Body Communication' What can we do with the HBC Technology ? Website
Mar. 30, 2009 'Human Body Communication' AMPLET developed HBC Telemetory System Prototype Website
Mar. 9, 2009 'Human Body Communication' We must know Human Body Characteristic Website
Mar. 3, 2009 New Antenna Technology (2) Website
Mar. 2, 2009 New Antenna Technology (1) --- What is the MIMO ? Website
Oct. 3, 2008 New Standards of Wireless Communications Website
Oct. 2, 2007 【CEATEC Report】 Human Body Communication Website
Jun. 15, 2007 Overview of Wireless Business Website