US 5,212,491 AGranted

Antenna arrangement for a portable transceiver

AssigneeAT&T Bell Laboratories

InventorsMelissa C. Chin, James G. Evans, Denis P. Orlando

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Abstract

An arrangement for increasing the level of radiated and received energy in a telescoping antenna while the antenna is in a collapsed position. The increase in energy is obtained through use of a sliding member which projects from the base of the antenna and contacts antenna matching circuitry for making changes to this circuitry when the antenna is collapsed. Initially tuned for resonating signals for transmission and reception with the antenna in an extended position, the antenna matching circuitry is retuned by a switching action provided by the sliding member for more effective resonating of these signals with the shorter length antenna. The switching action of the sliding member also activates gain control circuitry which increases the signal levels in both an associated transmitter and receiver when the antenna is in the collapsed position.

Claims2

Dependent claims

An arrangement for providing matching resonating circuitry for increasing the level of radiated energy in a telescoping antenna while the antenna is in a collapsed position and maintaining a maximum permitted level of radiated energy while the antenna is in an extended position, the arrangement comprising:

contact means for providing an electrical activation signal indication when the antenna is in the extended position and
antenna tuning means including first antenna tuning circuitry for resonating with the antenna at a selected frequency when the antenna is in the collapsed position and second antenna tuning circuitry for resonating with the antenna at said selected frequency when the antenna is in the extended position, the tuning means connecting the first antenna tuning circuitry to the antenna when said contact means indicates that the antenna is in the extended position and said tuning means connecting the second antenna tuning circuitry to the antenna when said contact means indicates that the antenna is in the collapsed position, each of said first antenna tuning circuitry and second antenna tuning circuitry providing a resonating inductance level wherein the resonating inductance level of the said first antenna tuning circuitry is greater than the resonating inductance level of said second antenna tuning circuitry.

Dependencies are inferred from the claim text.