| 摘要 |
AN ANTENNA FOR SMALL MOBILE DEVICES COMPRISES AN ANTENNA ROD (1) RETRACTABLE IN AN ANTENNA COVER (2) , THE ROD HAVING EITHER AN EXTENDED POSITION, WHEN THE DEVICE OPERATES IN AN ACTIVE MODE, OR A RETRACTED POSITION, WHEN THE DEVICE OPERATES IN A PASSIVE MODE. THE ELECTRICAL LENGTH OF THE ANTENNA IS DIFFERENT IN THE RESPECTIVE MODES. FURTHER, THE ANTENNA ROD (1) COMPRISES AN UPPER SECTION (3) AND A LOWER SECTION (4), SEPARATED FROM EACH OTHER BY AN INTERMEDIATED ELECTRICALLY INSULATING PART (7), WHEREIN THE UPPER SECTION (3) FORMS AN ANTENNA IN A PASSIVE MODE AND THE TWO SECTIONS (3, 4) IN THE ACTIVE MODE.(FIG. 1)
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