Abstract: Coaxial-to-microstrip transitions may include a microstrip line and coaxial-line assembly. The microstrip line includes a first dielectric having an aperture, a conductive strip disposed on one primary face of the first dielectric, and a ground plane disposed on the opposite primary face of the first dielectric. The coaxial-line assembly includes an outer conductor and an inner conductor. In some examples, the ground plane extends between the outer conductor and the inner conductor on a first side of the coaxial-line assembly proximate the conductive strip and an aperture cross section extends beyond the outer conductor on a second side of the coaxial-line assembly distal the conductive strip. In some examples, the ground plane has a non-circular aperture. In some examples, the outer conductor encloses an area that is less than an area of the aperture. In some examples, the enclosed area has a width that is less than a corresponding width of the first aperture.

Abstract: Coaxial-to-microstrip transitions may include a microstrip line and coaxial-line assembly. The microstrip line includes a first dielectric having an aperture, a conductive strip disposed on one primary face of the first dielectric, and a ground plane disposed on the opposite primary face of the first dielectric. The coaxial-line assembly includes an outer conductor and an inner conductor. In some examples, the ground plane extends between the outer conductor and the inner conductor on a first side of the coaxial-line assembly proximate the conductive strip and an aperture cross section extends beyond the outer conductor on a second side of the coaxial-line assembly distal the conductive strip. In some examples, the ground plane has a non-circular aperture. In some examples, the outer conductor encloses an area that is less than an area of the aperture. In some examples, the enclosed area has a width that is less than a corresponding width of the first aperture.

Abstract: Coaxial-to-microstrip transitions may include a microstrip line and coaxial-line assembly. The microstrip line includes a first dielectric having an aperture, a conductive strip disposed on one primary face of the first dielectric, and a ground plane disposed on the opposite primary face of the first dielectric. The coaxial-line assembly includes an outer conductor and an inner conductor. In some examples, the ground plane extends between the outer conductor and the inner conductor on a first side of the coaxial-line assembly proximate the conductive strip and an aperture cross section extends beyond the outer conductor on a second side of the coaxial-line assembly distal the conductive strip. In some examples, the ground plane has a non-circular aperture. In some examples, the outer conductor encloses an area that is less than an area of the aperture. In some examples, the enclosed area has a width that is less than a corresponding width of the first aperture.

Abstract: Coaxial-to-microstrip transitions may include a microstrip line and coaxial-line assembly. The microstrip line includes a first dielectric having an aperture, a conductive strip disposed on one primary face of the first dielectric, and a ground plane disposed on the opposite primary face of the first dielectric. The coaxial-line assembly includes an outer conductor and an inner conductor. In some examples, the ground plane extends between the outer conductor and the inner conductor on a first side of the coaxial-line assembly proximate the conductive strip and an aperture cross section extends beyond the outer conductor on a second side of the coaxial-line assembly distal the conductive strip. In some examples, the ground plane has a non-circular aperture. In some examples, the outer conductor encloses an area that is less than an area of the aperture. In some examples, the enclosed area has a width that is less than a corresponding width of the first aperture.

Abstract: First and second spaced-apart planar circuit ground conductors are formed on a base substrate. Multiple stages of an amplifier each have a field effect transistor (FET) flip mounted onto the substrate. A signal-return line couples the sources of the FETs together and functions as a radio frequency (RF) grounds for the amplifier. Direct-current-blocking coplanar couplers couple the amplifier input and output to external circuits. A single voltage supply applies a bias voltage to the drains of the FETs. A source resistance device couples each source terminal to circuit ground. The source resistance devices may be formed of two series-connected resistors. The gate of each FET is coupled to one of the circuit ground conductors through one of the source resistors. The other source resistor thereby provides a gate-to-source voltage for biasing the FET.

Abstract: Two or three conductor coplanar transmission lines and lossy coplanar resistive films are formed on a surface of a substrate. The resistive film dimensions and resistivity are selected to suppress various spurious electromagnetic modes within and around the substrate. The resistive films may be positioned along the outer edges of the transmission lines or between the transmission line conductors. The resistive film may have regular spaced openings for producing an average resistivity different than that of a continuous resistive film. In one embodiment, a signal conductor has a serpentine shape and resistive film elements are positioned between adjacent sections of the signal conductor. In another embodiment, interdigitated resistive film elements extend between transmission line conductors.

Abstract: Mixers assemblies including mixer cells, baluns, quadrature mixers and image reject mixers, etc. The mixer cell may contain CPW strip RF input and slot line strip LO input. LO signal return is provided through a flip-chip mounted to a mixer contact area and the CPW RF input is preferably coupled to the contact area through a distributed or flip-chip mounted capacitor. The use of two mixer cells in novel embodiments of quadrature and image reject mixers is disclosed. CPW to slot line power dividing baluns for use within and without such mixers are also disclosed.

Abstract: An amplifier including an amplifying transistor flip-mounted on a coplanar waveguide pattern. Elements of stability and/or matching circuits are provided at least in part under the flip-mounted transistor to facilitate compact design and to improve component performance. A serial resistor-shunt inductor pair is provided with the resistor coupled proximate the transistor input and/or output and preferably configured within the CPW center conductor to provided more consistent component values. Embodiments of the present invention include a two-stage amplifier having a transmission segment formed between the two stages which serves to rotate the output impedance of the first stage toward a low noise match with the second stage and to rotate the input impedance of the second stage toward a high gain match with the first stage. The transmission segment may include a capacitive element for providing series capacitance and DC blocking. Adjustable impedance matching means are also taught.