Abstract: A dual frequency band antenna has a first section with a dielectric material separating parallel first and second conductive layers. An electrical shunt extends between the first and second electrically conductive layers. A second section includes an inverted F element electrically connected to the second electrically conductive layer. A transmission medium carries signals between the antenna assembly and a communication circuit and has a first electrical conductor connected to the first electrically conductive layer and a second electrical conductor connected to the inverted F element.

Abstract: A dual frequency band antenna has a first section with a dielectric material separating parallel first and second conductive layers. An electrical shunt extends between the first and second electrically conductive layers. A second section includes an inverted F element electrically connected to the second electrically conductive layer. A transmission medium carries signals between the antenna assembly and a communication circuit and has a first electrical conductor connected to the first electrically conductive layer and a second electrical conductor connected to the inverted F element.

Abstract: An antenna assembly has a pair of disk-shaped antennae each tuned to a different frequency band thereby enabling the same antenna to be used to different types of communication equipment, such as cellular and PCS telephones. The first antenna has a first substrate with first and second conductive layers applied to its major surfaces, and the second antenna has a second substrate with third and fourth conductive layers applied to its major surfaces. A primary shunt extends between the first and second conductive layers to tune the first antenna, and a secondary shunt extends between the third and fourth conductive layers to tune the second antenna. The first and second antennae abut with the first conductive layer contacting the fourth conductive layer. A pair of electrical conductors are connected to different ones of the second and third conductive layers to carry communication signals to the antenna assembly.

Abstract: An antenna assembly has a first antenna with a planar dielectric first substrate and electrically conductive layers on opposing major surfaces of the first substrate. One or more hollow electrical shunts extend between the conductive layers and separate conductors are connected to the geometric centers of each conductive layer to carry communication signals to and from the first antenna. A second antenna abuts the first antenna and has a second planar substrate of dielectric material with a conductive radiating pattern on one surface. In an active version of the second antenna, a low noise amplifier is mounted on the second substrate. Another conductor extends through the hollow electrical shunt and is connected to the conductive pattern.

Abstract: A telescopic antenna assembly provides pairs of arms (210, 220, 230 and 240) on an elongated dielectric tube (260). A hot conductor (273) and a ground conductor (275) of a group of exciters couple energy between the arms and a feed line (250). The hot and ground conductors (273) and (275) slide within the tube (260) between extended and retracted positions while maintaining efficient electromagnetic coupling to the arms.

Abstract: Arms (310, 320, 330, 340) of an antenna element are connected to a balanced-unbalanced conversion network (510) at a feed point of excitation to provide an antenna assembly. Characteristics such as size of the antenna assembly are improved by providing a tuning element near connections (610, 620) to a feed point of excitation. The tuning element (410) is electrically connected to one of the arms (330) but is disposed with a gap between a neighboring arm (320). A gap may also be provided between the tuning element (410) and a feed point of excitation. The arms and tuning element are preferably thin metallic arms formed on an elongated dielectric tube (210) in the preferred construction of the invention. The balanced-unbalanced conversion network (510) may also be disposed within the elongated dielectric tube (210) according to the preferred construction.

Abstract: A dual function antenna structure transceives in first and second modes. A first feed (120) feeds a primary antenna element (110) for operation in the first mode. A second feed (240) connects to the first feed (120). An upper choke (150) and a metal layer (160) are tuned to a wavelength of the radio frequency energy to be transceived in the second mode. The primary antenna element (110) and the metal layer (160) thus realize a secondary antenna element for operation in the second mode. In a portable radio, dual function operation is thus possible by a compact structure by the first and second feeds (120, 140).

Abstract: A dual function antenna structure transceives in first and second modes. A first feed (120) feeds a primary antenna element (110) for operation in the first mode. A second feed (140) couples via a coupling element (130) to a portion of the first feed (120) or the primary antenna element (110) to realize a secondary antenna element. In a portable radio, dual function operation is thus possible by a compact structure by the first and second feeds (120, 140).

Abstract: Two coils (10, 20) couple energy to and from an antenna element (30). The lengths of the hot arm coil (10) and the ground arm coil (20) are different to cause a matched input for coupling to the resulting antenna structure. In a portable radio the two coils (10) and (20) efficiently couple to the antenna element (30) without inducing currents on the housing of the portable radio.