Compact dual-band metamaterial-based hybrid ring coupler
First Claim
Patent Images
1. An apparatus comprising:
- a substrate;
a transmission line in the form of a ring, the transmission line comprising right-handed and left-handed characteristics;
a plurality of ports spaced along said transmission line; and
a plurality of lumped elements disposed between the plurality of sections of the transmission line between ports.
6 Assignments
0 Petitions
Accused Products
Abstract
A compact multi-band hybrid ring (rat-race) coupler utilizing a ring of composite right-handed and left-handed (CRLH) transmission lines (TLs) and multiple ports, provides miniaturization and the ability to operate at arbitrary frequency bands unlike conventional couplers. The hybrid ring is made compact, such as by constraining phase delay contributions |φ1|, |φ2|≦270°. The coupler can be used in many applications, for example as a mode decoupling network in a dual-band front-end MIMO system. The inclusion of a CRLH delay line is also described which alters the phase relationship of the signals and is particularly well suited for extending pattern diversity in response to frequency.
13 Citations
20 Claims
-
1. An apparatus comprising:
-
a substrate; a transmission line in the form of a ring, the transmission line comprising right-handed and left-handed characteristics; a plurality of ports spaced along said transmission line; and a plurality of lumped elements disposed between the plurality of sections of the transmission line between ports. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
-
-
12. A transmitter/receiver coupling apparatus, comprising:
-
a transmission line arranged in a ring formation and configured to have right-handed and left-handed characteristics, the transmission line configured to operate in at least two frequency bands; a plurality of lumped elements disposed in segments of the transmission line, the plurality of lumped elements comprising inductances and capacitances configured to form the left-handed portions of the transmission line; a plurality of ports coupled to said transmission line along a periphery of said ring, said ports including a first input/output port and a second input/output port; a multiple-input multiple-output antenna array coupled to said transmission line and having a first antenna element coupled to the first input/output port, and a second antenna element coupled to the second input/output port. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
-
Specification