Microwave reflectiion amplifiers having increased bandwidth
AssigneeRaytheon Company
InventorsThomas K. Arthur, Michael H. Cobb, James W. McClymonds
Life of this patent
Estimating the term…
Abstract
A four diode reflection amplifier having a relatively wide bandwidth of at least 5 percent over the frequency range of 43.5 to 45.5 GHz includes three magic Ts arranged to provide a 4-way passive power combiner. The 4-way passive power combiner symmetrically couples each of the four diode amplifiers to an input/output port of the reflection amplifier. To provide the improved bandwidth performance, a perturbation impedance in the form of a single shunt capacitance is inserted at the input/output port of the reflection amplifier to provide a selected perturbation in the load impedance and hence the reflection characteristic seen by the reflection amplifier over a selected band of operation of the amplifier.
Claims12
A microwave circuit comprising:
- a pair of negative resistance diode amplifiers each having an input/output port;
- means, having an input/output port and having a pair of ports, for passively combining said input/output ports of said pair of negative resistance diode amplifiers;
- and
- means disposed in said input/output port of said combining means for providing selected, equal perturbations in load impedance at the input/output poet of each one of said pair of diode amplifiers.
A microwave reflection amplifier circuit, comprising:
- first and second magic T's each having a pair of colinear arms, an E-plane arm, and an H-plane arm;
- first and second pairs of IMPATT diode modules coupled to the colinear arms of said respective first and second magic T's, with a first one of E-plane arms and H-plane arms of said first and second magic T's being terminated in a characteristic impedance;
- a third magic T having a pair of colinear arms, an E-plane arm and an H-plane arm, with said pair of colinear arms of the third magic T being coupled to a second one of the E-plane arms and H-plane arms of the first and second magic T's, with a first one of the E-plane arms and H-plane arms of the third magic T being terminated in a characteristic impedance and the second one of the E-plane arms and H-plane arms disposed as the input/output port of the circuit;
- and
- means disposed disposed in the input/output port of the third magic T for providing a small impedance perturbation in the output port to increase the gain flatness of the circuit.
Dependencies are inferred from the claim text.