Antenna apparatus, communication apparatus, and image capturing system

A communication apparatus comprising:

• an antenna apparatus for generating or detecting an electromagnetic wave that comprises:
• a first active antenna including a first oscillator and a first antenna;
• a second active antenna including a second oscillator and a second antenna;
• a coupling wire configured to couple the first antenna and the second antenna;
• a first terminal configured to accept a signal for controlling a first oscillation frequency of the first oscillator before synchronization by the coupling wire;
• and
• a second terminal configured to accept a signal for controlling, independently of the first oscillation frequency, a second oscillation frequency of the second oscillator before synchronization by the coupling wire;
• a transmission unit configured to emit an electromagnetic wave;
• and
• a reception unit configured to detect the electromagnetic wave.

An image capturing system comprising:

• an antenna apparatus for generating or detecting an electromagnetic wave that comprises:
• a first active antenna including a first oscillator and a first antenna;
• a second active antenna including a second oscillator and a second antenna;
• a coupling wire configured to couple the first antenna and the second antenna;
• a first terminal configured to accept a signal for controlling a first oscillation frequency of the first oscillator before synchronization by the coupling wire;
• and
• a second terminal configured to accept a signal for controlling, independently of the first oscillation frequency, a second oscillation frequency of the second oscillator before synchronization by the coupling wire;
• a transmission unit configured to emit an electromagnetic wave to an object;
• and
• a detection unit configured to detect the electromagnetic wave reflected by the object.