TH18557B - Antenna assembly for wireless communication devices - Google Patents

Abstract

Retractable antenna assemblies (206, 900) provide impedance. A paired antenna to the radio telephone pairing circuit (712) (200), whether the retractable antenna assembly is in a fixed or retracted position. In the form, one part (304, 312) of the capacitor (714) is built into the upper part of the Retractable aerial assembly (206), in which, when in the retractable position, the capacitor (714) provides the combined air impedance.In other ways, a capacitor (1302) is built into the lower portion of the piece. Retractable aerial part (900)

Claims (10)

1. Retractable antenna assembly for wireless communication devices: A retractable antenna assembly has fixed and retracted positions related to the wireless communication device and has antenna impedance related to each position. The wireless communication device has feed point contacts. The retractable antenna assembly consists of a helical radiation device and a linear radiation device, with the top part electrically in contact with the helical radiation device. When the antenna assembly is in the retracted position, a capacitor is created between the linear radiation device and the feed point contact. The capacitor affects the antenna impedance at the feed point contact in such a way that it makes the antenna impedance relatively equal at the feed point contact when the antenna assembly is in the extended position. 2. The retractable antenna assembly of Pledge 1 is subsequently constructed with a coating covering the top portion, where in the retracted position the feed contacts are in direct electrical contact with the coating; thus, a capacitor is created by the top portion, the coating and the feed contacts, which create a capacitive connection between the top portion and the feed contacts. 3. The retractable antenna assembly of Claim 1 is further comprised of a coating covering the top portion and at least partial shielding of the lead end enclosing that coating; thus, the capacitor is created by the top portion, the coating, and the lead end shielding. 4. The retractable antenna assembly of claim 3, where in the retracted position the lead end is in direct electrical contact with the feed contact, creating a capacitive connection between the upper part and the feed contact. 5. The retractable antenna assembly of Pledge 1, the linear radiating device, will also have a bottom section, which the retractable antenna assembly further comprises with a coating covering the bottom section and a bottom lead end shielding that encloses at least part of the coating covering the bottom section. Thus, the capacitor is created by that bottom section, the coating and the bottom lead end shielding. 6. The retractable antenna assembly of claim 5, a wireless communication device, also has end contacts where, in the retractable position, the lower conductive sheath makes direct electrical contact with those end contacts, creating a capacitive connection between the lower part and those end contacts. 7. The retractable antenna assembly of claim 5, where in the extended position, the end covering and the lower conductor are in direct electrical contact with the feed contacts, thus creating a capacitive connection between the lower part and the feed contacts. 8. The retractable antenna assembly of Pledge 1 is a wireless communication device that still has a ground point and end contacts electrically connected to the ground point; a linear radiation device that still has an electrical length of approximately one-quarter wavelength; and a lower part that is electrically connected to the end contacts in the retracted position, which creates an electrical connection between the lower part and the ground point in the retracted position. 9. The retractable antenna assembly of claim 8, a wireless communication device that will also have a ground plane, where in the retracted position the linear propagation device is close to the ground plane, thus the linear propagation device will have transmission characteristics in the retracted position. 10. The retractable antenna assembly of Pledge 1 is a wireless communication device that will also have a ground point and segments which at least some parts consist of conductive material and are electrically connected to the ground point, in the retracted position of which a linear propagation device is inserted into the segments, thus the linear propagation device and segments will have coaxial characteristics.