Multi-band helical antenna

A multi-band helical antenna comprising:

• a dielectric body including at least a plurality of first dielectric sheets of a first thickness tl and a plurality of second dielectric sheets of a second thickness t2 that is different from t1, the dielectric sheets being stacked in a predetermined order;
• and
• at least a first metallic pattern section and a second metallic pattern section provided in the first dielectric sheets and the second dielectric sheets, respectively, the first metallic pattern section including a plurality of first partially opened metallic loop patterns spaced apart from each other by a first distance and a plurality of first connection elements connecting the respective adjacent first metallic loop patterns to form a first spiral structure, and the second metallic pattern section including a plurality of second partially opened metallic loop patterns spaced apart from each other by a second distance different from the first distance and a plurality of second connection elements connecting the respective adjacent second metallic loop patterns to form a second spiral structure.

A multi-band helical antenna comprising:

• a dielectric body including a plurality of dielectric sheets of a predetermined thickness, the dielectric sheets being stacked in a predetermined order;
• and
• at least a first metallic pattern section and a second metallic pattern section provided in the dielectric body, the first metallic pattern section including a plurality of first partially opened metallic loop patterns having a first radius r1 and a plurality of first connection elements connecting the respective adjacent first partially opened metallic loop patterns to form a first spiral structure, and the second metallic pattern section including a plurality of second partially opened metallic loop patterns having a second radius r2 that is different from r1 and a plurality of second connection elements connecting the respective adjacent second partially opened metallic loop patterns to form a second spiral structure.

A multi-band helical antenna comprising:

• a dielectric body including a plurality of dielectric sheets of a predetermined thickness, the dielectric sheets being stacked in a predetermined order;
• at least a first metallic pattern section and a second metallic pattern section provided in the dielectric body, the first metallic pattern section including a plurality of first partially opened metallic loop patterns having a first entire length l1 and a plurality of first connection elements connecting the respective adjacent first partially opened metallic loop patterns to form a first spiral structure, and the second metallic pattern section including a plurality of second partially opened metallic loop patterns having a second entire length l2 different from l1 and a plurality of second connection elements connecting the respective adjacent second partially opened metallic loop patterns to form a second spiral structure.