TY - GEN
T1 - Balanced low-loss Ka-band μ-coaxial hybrids
AU - Vanhille, Kenneth
AU - Filipović, Dejan
AU - Nichols, Christopher
AU - Fontaine, Daniel
AU - Wilkins, Wendy
AU - Daniel, Erik
AU - Popović, Zoya
PY - 2007
Y1 - 2007
N2 - Miniature hybrid couplers are designed in an air-filled microfabricated rectangular coaxial line technology for operation near 36 GHz. The size of the couplers is less than 2.7 mm by 2.7 mm in area and 420 μm in height Air-filled copper μ-coaxial cable provides less than 0.3dB/cm loss at Ka-band. Coaxial-to-CPW probe transitions on the ports provide means to perform 4-port VNA measurements with an external SOLT calibration. After implementing a de-embedding procedure, measurements show return loss and isolation better than 20 dB, with output amplitudes of 3.2 dB ±0.1 dB, and output phase differences of 90° ±2.0° from 34.5 to 36.5 GHz. The return loss and isolation minima are shifted in frequency as compared to the optimal output amplitude and phase frequency. This frequency difference is 1.5 GHz near 36 GHz with this technology, however branch line couplers using branch-length and reactive tee-junction compensation methods are presented. The improvement is experimentally verified; the frequency differences are 0.5 and 0.2 GHz for the two compensated designs.
AB - Miniature hybrid couplers are designed in an air-filled microfabricated rectangular coaxial line technology for operation near 36 GHz. The size of the couplers is less than 2.7 mm by 2.7 mm in area and 420 μm in height Air-filled copper μ-coaxial cable provides less than 0.3dB/cm loss at Ka-band. Coaxial-to-CPW probe transitions on the ports provide means to perform 4-port VNA measurements with an external SOLT calibration. After implementing a de-embedding procedure, measurements show return loss and isolation better than 20 dB, with output amplitudes of 3.2 dB ±0.1 dB, and output phase differences of 90° ±2.0° from 34.5 to 36.5 GHz. The return loss and isolation minima are shifted in frequency as compared to the optimal output amplitude and phase frequency. This frequency difference is 1.5 GHz near 36 GHz with this technology, however branch line couplers using branch-length and reactive tee-junction compensation methods are presented. The improvement is experimentally verified; the frequency differences are 0.5 and 0.2 GHz for the two compensated designs.
KW - Coaxial couplers
KW - Millimeter wave devices
KW - Photolithography
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U2 - 10.1109/MWSYM.2007.380335
DO - 10.1109/MWSYM.2007.380335
M3 - Conference contribution
AN - SCOPUS:34748898405
SN - 1424406889
SN - 9781424406883
T3 - IEEE MTT-S International Microwave Symposium Digest
SP - 1157
EP - 1160
BT - 2007 IEEE MTT-S International Microwave Symposium Digest
T2 - 2007 IEEE MTT-S International Microwave Symposium, IMS 2007
Y2 - 3 June 2007 through 8 June 2007
ER -