Diaper

A diaper including a wetness reporting pad, said wetness reporting pad including:

• a piece of substrate with a major surface and an electric circuit on said major surface,
• a sensor connected with said electric circuit for measuring the electrical resistance of said electric circuit, and
• a data transmitter for receiving results of said measuring from said sensor for wireless transmission,
• wherein said sensor and said data transmitter are comprised in an integrated circuit (IC),
• further including a third terminal connecting with said second electrically conductive line via a calibration conductive line, allowing electrical resistance of said electric circuit to be measured for calibration purpose.

A diaper including a wetness reporting pad, said wetness reporting pad including:

• a piece of substrate with a major surface and an electric circuit on said major surface,
• a sensor connected with said electric circuit for measuring the electrical resistance of said electric circuit, and
• a data transmitter for receiving results of said measuring from said sensor for wireless transmission,
• wherein said sensor and said data transmitter are comprised in an integrated circuit (IC),
• wherein said IC is comprised in a sensor module which is releasably engageable with said substrate,
• wherein said sensor module includes a plurality of waterproof spring-loaded pogo pins which, when said sensor module is engaged with said substrate, electrically connect with said electric circuit on said major surface of said substrate, and
• wherein said sensor is adapted to measure the electrical resistance of each of said waterproof spring-loaded pogo pins.

A diaper including a wetness reporting pad, said wetness reporting pad including:

• a piece of substrate with a major surface and an electric circuit on said major surface,
• a sensor connected with said electric circuit for measuring the electrical resistance of said electric circuit, and
• a data transmitter for receiving results of said measuring from said sensor for wireless transmission,
• wherein said sensor and said data transmitter are comprised in an integrated circuit (IC), and
• wherein said sensor is adapted to measure the electrical resistance of said electric circuit in a pulsed manner.

A wetness reporting system including at least one diaper including at least one wetness reporting pad, at least one RFID reader and at least one antenna,

• wherein said wetness reporting pad includes:
• a piece of substrate with a major surface and an electric circuit on said major surface,
• a sensor connected with said electric circuit for measuring the electrical resistance of said electric circuit, and
• a data transmitter for receiving results of said measuring from said sensor for wireless transmission,
• wherein said antenna has a leaky wave traveling wave mechanism,
• wherein radio frequency wave leaks out from a top surface of a parallel plate traveling wave waveguide of said antenna,
• wherein said top surface comprises a crossed mesh of conductive aluminum material, and
• wherein said parallel plate traveling wave waveguide of said antenna has at its excitation a sideway approaching coaxial cable with an external connector grounded to a metal back of said antenna.

A method of reporting wetness of a subject, including steps:

• (a) positioning an electric circuit beneath said subject,
• (b) measuring the electric resistance of said electric circuit,
• (c) wirelessly transmitting data indicative of the electrical resistance of said electric circuit,
• (d) determining, on the basis of said data, whether the subject is wet, and
• (e) sensing and storing the time at which a sensor module is detached from a wetness reporting pad of a diaper and the time at which said sensor module is attached to a medical pad of a diaper.

A method of calibrating a wetness reporting pad of a diaper:

• wherein said wetness reporting pad includes a piece of substrate with a major surface and an electric circuit on said major surface, a sensor connected with said electric circuit for measuring the electrical resistance of said electric circuit, and a data transmitter for receiving results of said measuring from said sensor for wireless transmission,
• wherein said electric circuit includes a first electrically conductive line with a first terminal and a second electrically conductive line with a second terminal, each said electrically conductive line being in the shape of a comb and interlocking with each other, and
• wherein said electric circuit further includes a third terminal connecting with said second electrically conductive line via a calibration conductive line,
• said method including a step (r) of measuring the electrical resistance of said calibration conductive line.