| 摘要 |
<p>A compact and rugged antenna system (10) particularly suited to direction finding includes a plurality of antenna arrays (12, 14 and 16) for receiving respective frequency bands and colocated on a mast (15) with separation between antenna arrays (12, 14 and 16) along the mast (15). The mast includes a coil (18) wound of an insulator (24) and functioning as a loaded inductor (18) to shift the mast (15) resonance out of the frequency band of the antenna system (10). A VHF dipole array (12) having elements shaped to reduce scattering to UHF and SHF arrays (14 and 16) is supported on movable arms (29) which allow retraction that reduces height and provides mechanical protection to one or more other arrays as well as damping against vibration by contacting the mast (15) with shaped portions of the dipole elements (12).</p> |
