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CAD of a six‐port junction using miniature hybrid microwave‐integrated circuit technology (MHMIC) is presented. Frequency compensation of the q/s points is introduced and studied. The design is suited for use in swept frequency measurements covering a relatively wide frequency band. The junction incorporates three branch‐line couplers, an edge‐line coupler, a Wilkinson power divider, and a 3‐dB attenuator. The physical dimensions of the junction are 2 m × 1.5 cm. The practical operating frequency of the six‐port junction is measured to be 6–12 GHz in spite of a 3‐dB bandwidth limitation of about 20% for the branch line couplers. Some interesting applications of MHMIC/MMIC six‐port junctions are suggested. © 1993 John Wiley & Sons, Inc.

This paper presents the design of monolithic six-port module MSPM with resistive bridges. It shows how these simple structures may act as directional resistive couplers. Final MMIC circuit includes six-port junction and matched MESFET detectors covering an area of 1.2 mm2 in the frequency range 100 MHz to 3 GHz. The MSPM was bonded in a MIC structure with output coaxial connectors. Experimental results obtained using a commercial network analyzer and our measurement system are in good agreement. The magnitude and the phase variation between the two measurement systems are equal to .2dB and 2 degrees for respective modulus values of 0, 6, 12 dB. For a nominal 20 dB return loss load, the differences are respectively equal to 0.5dB and 5 degrees in the operational frequency band. In a second step, the measurement system was integrated inside the tips of a probe station and experimental results will be available at the ARFTG session.

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