Capacitive compensation of cascaded directional couplers
First Claim
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1. A cascaded directional couplers circuit comprising:
- a first directional coupler having an input port electrically connected to an output port through a first coupling element and a coupled port connected to an isolated port through a second coupling element, the first coupling element to pass a first RF signal having a frequency of a first frequency band, the second coupling element to couple the first RF signal passed by the first coupling element; and
a second directional coupler having an input port electrically connected to an output port through a first coupling element and a coupled port connected to an isolated port through a second coupling element, the first coupling element to pass a second RF signal having a frequency of a second frequency band, the second coupling element to couple the second RF signal passed by the first coupling element of the second directional coupler, the first directional coupler being capacitively connected to the second directional coupler through a capacitor connected between the coupled port of the first directional coupler and the isolated port of the second directional coupler.
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Abstract
A cascaded directional couplers circuit having capacitive compensation such that the directivity of a resistively terminated one of the cascaded couplers is not degraded by an inductance of the other one of the cascaded directional couplers.
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Citations
20 Claims
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1. A cascaded directional couplers circuit comprising:
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a first directional coupler having an input port electrically connected to an output port through a first coupling element and a coupled port connected to an isolated port through a second coupling element, the first coupling element to pass a first RF signal having a frequency of a first frequency band, the second coupling element to couple the first RF signal passed by the first coupling element; and a second directional coupler having an input port electrically connected to an output port through a first coupling element and a coupled port connected to an isolated port through a second coupling element, the first coupling element to pass a second RF signal having a frequency of a second frequency band, the second coupling element to couple the second RF signal passed by the first coupling element of the second directional coupler, the first directional coupler being capacitively connected to the second directional coupler through a capacitor connected between the coupled port of the first directional coupler and the isolated port of the second directional coupler. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A mobile terminal for operating in multiple radio frequency (RF) frequency bands, the mobile terminal comprising:
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an antenna; a receiver coupled to the antenna; and a transmitter coupled to the antenna, the transmitter comprising; a first RF power amplifier for amplifying a first RF signal having a frequency of a first frequency band within which the mobile terminal transmits; a second RF power amplifier for amplifying a second RF signal having a frequency of a second frequency band within which the mobile terminal transmits; a cascaded directional couplers circuit with a first directional coupler having an input port electrically connected to an output port through a first coupling element and a coupled port connected to an isolated port through a second coupling element, the first coupling element to pass the first RF signal having a frequency of the first frequency band, the second coupling element to couple the first RF signal passed by the first coupling element, and a second directional coupler having an input port electrically connected to an output port through a first coupling element and a coupled port connected to an isolated port through a second coupling element, the first coupling element to pass the second RF signal having a frequency of the second frequency band, the second coupling element to couple the second RF signal passed by the first coupling element of the second directional coupler, the first directional coupler being capacitively connected to the second directional coupler through a capacitor connected between the coupled port of the first directional coupler and the isolated port of the second directional coupler. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A cascaded directional couplers circuit comprising:
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an integrated circuit substrate; a first directional coupler integrated into the integrated circuit substrate, the first directional coupler having an input port electrically connected to an output port through a first coupling element and a coupled port connected to an isolated port through a second coupling element, the first coupling element to pass a first RF signal having a frequency of a first frequency band, the second coupling element to couple the first RF signal passed by the first coupling element; and a second directional coupler integrated into the integrated circuit substrate, the second directional coupler having an input port electrically connected to an output port through a first coupling element and a coupled port connected to an isolated port through a second coupling element, the first coupling element to pass a second RF signal having a frequency of a second frequency band, the second coupling element to couple the second RF signal passed by the first coupling element of the second directional coupler, the first directional coupler being capacitively connected to the second directional coupler through a capacitor connected between the coupled port of the first directional coupler and the isolated port of the second directional coupler. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification