Abstract: In order to confirm an activity state of a pelvic floor muscle during practice of a pelvic floor muscle exercise, a sensor sheet is attached to a region of an abdomen corresponding to a transverse abdominal muscle, and acquires an electromyogram of the transverse abdominal muscle in which a cooperative contraction with the pelvic floor muscle occurs. Here, even when the transverse abdominal muscle is contracted, the pelvic floor muscle is not necessarily contracted, so that the activity state of the pelvic floor muscle is confirmed by an echo. More specifically, an ultrasound sensor is pressed against the abdomen so that the ultrasound probe is brought into contact with the sensor sheet, and an image (M-mode image) of an ultrasound echo indicating an activity state of a bottom of a bladder that can be regarded as the contraction of the pelvic floor muscle is acquired.

Abstract: A millimeter-wave radar cover housing a millimeter-wave radar including an antenna and an electronic circuit configured to drive the antenna includes: a first site provided in front of the millimeter-wave radar to protect the millimeter-wave radar and transmit millimeter waves emitted from the antenna; and a second site including a housing space in which the antenna and the electronic circuit except for the first site are housed. The first site is made of a stacked structural body obtained by stacking at least one layer of a first constituent material having a negative relative permittivity in the frequency band of the millimeter waves and a second constituent material having a positive relative permittivity in the frequency band of the millimeter waves, and the stacked structural body is curved in a convex shape in a direction centered at an emission source of the millimeter electromagnetic waves and departing from the emission source.

Abstract: A millimeter-wave radar cover housing a millimeter-wave radar including an antenna and an electronic circuit configured to drive the antenna includes: a first site provided in front of the millimeter-wave radar to protect the millimeter-wave radar and transmit millimeter waves emitted from the antenna; and a second site including a housing space in which the antenna and the electronic circuit except for the first site are housed. The first site is made of a stacked structural body obtained by stacking at least one layer of a first constituent material having a negative relative permittivity in the frequency band of the millimeter waves and a second constituent material having a positive relative permittivity in the frequency band of the millimeter waves, and the stacked structural body is curved in a convex shape in a direction centered at an emission source of the millimeter electromagnetic waves and departing from the emission source.