초록 ▼

A portable radiotelephone unit is provided with an internal antenna in a space between an internal, electrically conductive enclosure for electrical apparatus of the unit and an external, electrically nonconductive housing of the unit. The antenna is a microstrip, folded-slot, edge-congruent device

A portable radiotelephone unit is provided with an internal antenna in a space between an internal, electrically conductive enclosure for electrical apparatus of the unit and an external, electrically nonconductive housing of the unit. The antenna is a microstrip, folded-slot, edge-congruent device comprising a stack of alternate, electrically conductive layers and dielectric layers. A high frequency band antenna module and a low frequency band antenna module are included in the antenna, and all layers of that antenna are dimensioned to determine, at least in part, the frequency characteristics of the antenna. Perpendicular and parallel attachments are shown for a feed cable extending, via a hole in the enclosure, between the antenna and radiotelephone unit electrical apparatus within the enclosure.

대표청구항 ▼

A portable radio communication unit comprising: a housing formed of an electrically nonconductive material; a microstrip, folded-slot antenna secured to a wall of said housing, said antenna having a width dimension oriented substantially parallel to said wall, having a depth dimension substantially

A portable radio communication unit comprising: a housing formed of an electrically nonconductive material; a microstrip, folded-slot antenna secured to a wall of said housing, said antenna having a width dimension oriented substantially parallel to said wall, having a depth dimension substantially perpendicular to said wall, and having a ratio of antenna width to antenna depth selected to fix a predetermined frequency bandwidth characteristic for said antenna; said antenna comprising two folded-slot, antenna modules in a stack for predetermined high and low frequency bands, respectively, corresponding to portable, cellular, radiotelephone, receive and transmit bands, respectively; said housing has a predetermined inside width; said stack has a depth which is substantially less than the width thereof in any direction in a plane of congruent edges of a major surface of a low frequency band module of said stack; said low frequency band module has a width dimension which substantially fills an otherwise unoccupied portion of said inside width of said housing; said low frequency band module includes a layer of dielectric material of predetermined thickness and dielectric constant, said thickness and dielectric constant being determined in relation to the width of said low frequency band module to establish an operating bandwidth spanning at least said cellular radiotelephone transmit band; electrical apparatus contained within an electrically conductive enclosure secured within said housing; means for securing said antenna to an exterior wall of said conductive enclosure in electrical contact with said conductive enclosure exterior wall and between said housing and said conductive enclosure; means for electrically connecting said antenna with said apparatus, said connecting means comprising at least two electrical conductors extending between said antenna and said apparatus, at least one of said conductors being insulated; a drive point on said antenna at a point of at least approximate impedance match for said conductors and a hole through said stack at said drive point and through which said insulated conductor is extended, parallel to said depth of said stack and perpendicular to said plane of congruent edges, for connection one of said modules which is an exterior module of said stack; means connecting a second one of said conductors to another one of said modules which is an exterior module of said stack; a groove in one of said modules from an edge thereof to said hole at said drive point, said groove being of sufficient depth and width to accommodate a section of said insulated conductor, and a pass-through hole in said conductive enclosure adjacent to an end of said groove at an edge of said stack for passing said conductors between said antenna and said apparatus.