A circulator (10, 100) comprising: a first port (30, 150) having a first port impedance matching circuit defining an impedance of the first port (30, 150); a second port (32, 152) having a second port impedance matching circuit defining an impedance of the second port (32, 152); and a third port (34, 154) having a third port impedance matching circuit defining an impedance of the third port (34, 154), wherein the impedance of the first port (30, 150) is provided to match an impedance of a first external circuit, the impedance of the second port (32, 152) is provided to match an impedance of a second external circuit, and the impedance of the third port (34, 154) is provided to match an impedance of a third external circuit, wherein the impedance of the third port (34, 154) is different than the impedance of the first port (30, 150), wherein the first port impedance matching circuit comprises a first upper dielectric material and a first lower dielectric material disposed on opposing sides of a first transformer, wherein the second port impedance matching circuit comprises a second upper dielectric material and a second lower dielectric material disposed on opposing sides of a second transformer, and wherein the third port impedance matching circuit comprises a third upper dielectric material and a third lower dielectric material disposed on opposing sides of a third transformer, wherein the first upper dielectric material is different than the third upper dielectric material, wherein the first lower dielectric material is different than the third lower dielectric material, and wherein dimensions of the first, second and third transformers (130, 132, 134) are substantially the same. a first port (30, 150) having a first port impedance matching circuit defining an impedance of the first port (30, 150); a second port (32, 152) having a second port impedance matching circuit defining an impedance of the second port (32, 152); and a third port (34, 154) having a third port impedance matching circuit defining an impedance of the third port (34, 154), wherein the impedance of the first port (30, 150) is provided to match an impedance of a first external circuit, the impedance of the second port (32, 152) is provided to match an impedance of a second external circuit, and the impedance of the third port (34, 154) is provided to match an impedance of a third external circuit, wherein the impedance of the third port (34, 154) is different than the impedance of the first port (30, 150), wherein the first port impedance matching circuit comprises a first upper dielectric material and a first lower dielectric material disposed on opposing sides of a first transformer, wherein the second port impedance matching circuit comprises a second upper dielectric material and a second lower dielectric material disposed on opposing sides of a second transformer, and wherein the third port impedance matching circuit comprises a third upper dielectric material and a third lower dielectric material disposed on opposing sides of a third transformer, wherein the first upper dielectric material is different than the third upper dielectric material, wherein the first lower dielectric material is different than the third lower dielectric material, and wherein dimensions of the first, second and third transformers (130, 132, 134) are substantially the same.