Abstract:
Waveguide-to-transmission line transitions are provided for broadband, high performance coupling of power at microwave and millimeter wave frequencies. In one aspect, a transition apparatus (10) includes a transition housing (11) comprising a rectangular waveguide channel (C) and an aperture (13) formed through a broad wall (11a) of the rectangular waveguide channel (C), a substrate ( 12) having a first surface and a second surface opposite the first surface, mid a planar transmission line (12a) and a planar probe (12b) formed on the first surface, wherein the planar transmission line (12a) comprises a first conductive strip and a second conductive strip, wherein the planar probe (12b) is connected to, and extends from, an end of the first conductive strip, and wherein an end of the second conductive strip is terminated by a stub and wherein the substrate (22) is positioned in the aperture (13) such that the printed probe (12b) protrudes into the rectangular waveguide channel (C) at an offset from a center of the broad wall (11a) and wherein the ends of the first and second conductive strip are aligned to an inner surface of the broad wail (11a) of the rectangular waveguide channel (C).
Abstract:
Apparatus and methods are provided for integrally packaging semiconductor IC (integrated circuit) chips and antenna devices which are integrally constructed from package frame structures (e.g., lead frame, package carrier, package core, etc.), to thereby form compact integrated radio/wireless communications systems for millimeter wave applications. For example, an electronic apparatus (30) includes a package frame (11) having an antenna (12) that is integrally formed as part of the package frame (11), an IC (integrated circuit) chip (13) mounted to the package frame (11), interconnects (19) that provide electrical connections to the IC chip (13) and the antenna (12), and a package cover (15).
Abstract:
Circuits and methods are provided for implementing highly efficient switch-mode power amplifiers using BJTs (bipolar junction transistors) as active switching devices at millimeter- wave frequencies. For example, a power amplifier circuit (100) includes an active switch device comprising a BJT (bipolar junction transistor) (Tl) and an input network (105), (106) coupled to a base of the BJT (Tl) to drive the active switch device to achieve highly efficient switch-mode (e.g., Class E) operation at millimeter wave frequencies (e.g., 60 GHz). The input network (105), (106), which may be a passive or active driver network, is designed to provide optimal driving conditions. For instance, the input network (105), (106) is designed to present a real input impedance in a range of about 7 Ohms to about 15 Ohms as seen from the base of the active switch device (Tl). Another optimal driving condition includes the input network (105), (106) being designed to provide an asymmetrical drive current to the base of the active switch device (Tl), wherein the negative peak base current exceeds the positive peak base current. Further, the input network is designed to provide an asymmetrical drive base current to the active switch device (Tl) such that the base voltage has a swing that does not exceed about 400 mVpp (millivolts peak-to-peak).