RF module using mode converting structure having short-circuiting waveguides and connecting windows
First Claim
1. An RF module, comprising:
- a first waveguide having a ground electrode and a line-shaped conductor portion for propagating electromagnetic waves in a TEM mode; and
a second waveguide connected to the first waveguide, for propagating electromagnetic waves in another mode different from the TEM mode,wherein the second waveguide has a region surrounded by at least two ground electrodes stacked in a vertical direction so as to face each other and conductors for bringing the at least two ground electrodes into conduction, wherein electromagnetic waves in said another mode propagate in the region, and a connecting window is provided in one of the at least two ground electrodes,the first waveguide extends in a stacking direction of the at least two ground electrodes of the second waveguide, an end of the first waveguide is short-circuited and conductively connected to the one of the at least two ground electrodes of the second waveguide at a periphery of the connecting window, andmagnetic fields of the first and second waveguides are coupled in an H plane of the second waveguide so that the direction of the magnetic field of electromagnetic waves propagated in the first waveguide and the direction of the magnetic field of electromagnetic waves propagated in the second waveguide match with each other.
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Abstract
The present invention is directed to enable mode conversion between a TEM mode and another mode to be performed among a plurality of waveguides. An RF module comprises: a TEM waveguide as a first waveguide for propagating electromagnetic waves in a TEM mode; and a waveguide having a multilayer structure as a second waveguide connected to the first waveguide, for propagating electromagnetic waves in another mode different from the TEM mode. An end of the first waveguide is directly conductively connected to one of ground electrodes of the second waveguide from the stacking direction side of the ground electrodes. Since magnetic fields are coupled so that the direction of the magnetic field of the first waveguide and that of the magnetic field of the second waveguide match with each other in the H plane, mode conversion between the TEM mode and another mode can be excellently performed between the waveguides.
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Citations
5 Claims
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1. An RF module, comprising:
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a first waveguide having a ground electrode and a line-shaped conductor portion for propagating electromagnetic waves in a TEM mode; and a second waveguide connected to the first waveguide, for propagating electromagnetic waves in another mode different from the TEM mode, wherein the second waveguide has a region surrounded by at least two ground electrodes stacked in a vertical direction so as to face each other and conductors for bringing the at least two ground electrodes into conduction, wherein electromagnetic waves in said another mode propagate in the region, and a connecting window is provided in one of the at least two ground electrodes, the first waveguide extends in a stacking direction of the at least two ground electrodes of the second waveguide, an end of the first waveguide is short-circuited and conductively connected to the one of the at least two ground electrodes of the second waveguide at a periphery of the connecting window, and magnetic fields of the first and second waveguides are coupled in an H plane of the second waveguide so that the direction of the magnetic field of electromagnetic waves propagated in the first waveguide and the direction of the magnetic field of electromagnetic waves propagated in the second waveguide match with each other. - View Dependent Claims (2, 3, 4, 5)
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Specification