Composite amplifier with divider/combiner
First Claim
1. A power combiner for combining a plurality of microwave input signals comprising:
- a plurality of input terminals adapted for coupling to said microwave input signals,each said input terminal coupled to a first end of a respective transmission line and to a first end of a respective resistor,the second ends of said transmission lines coupled together to combine the input signals at an output terminal,each second end of said resistors coupled through one or more coupling circuits to said second end of said remaining resistors to provide electrical isolation between said input terminals.
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Accused Products
Abstract
A power combiner has been described incorporating N transmission lines each having a quarter wavelength or multiple thereof for a frequency within a predetermined frequency range where the input of each transmission line has a resistor coupled thereto with the other ends of the resistors coupled together using inductance and capacitance to compensate for the distances between the resistors to provide a floating node which is low impedance in the predetermined frequency range. A composite amplifier is described on gallium arsenide wherein a power divider and power combiner are coupled to a plurality of MESFET'"'"'s and wherein each input and output of the power combiner and power divider have a resistive load with respect to the MESFET while including a matching circuit and wherein each input of the combiner has a resistor coupled to a first floating node and each output of the divider has a resistor coupled to a second floating node. The invention overcomes the problem of a composite amplifier where many elemental amplifiers must be driven and their output signals combined at frequencies where the physical layout would provide phase differences such as in a layout of parallel cells on a flat surface of a substrate.
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Citations
16 Claims
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1. A power combiner for combining a plurality of microwave input signals comprising:
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a plurality of input terminals adapted for coupling to said microwave input signals, each said input terminal coupled to a first end of a respective transmission line and to a first end of a respective resistor, the second ends of said transmission lines coupled together to combine the input signals at an output terminal, each second end of said resistors coupled through one or more coupling circuits to said second end of said remaining resistors to provide electrical isolation between said input terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A composite amplifier for amplifying signals comprising,
an input terminal, a plurality of first transmission lines having a first end coupled to said input terminal and a second end coupled to the input of a respective elemental amplifier and to a first end of a respective first resistor, each second end of said first resistors coupled through one or more first coupling circuits to said second end of said remaining resistors to provide electrical isolation between said inputs of said elemental amplifiers, and means for combining the outputs of said plurality of elemental amplifiers.
Specification