Microwave Measurement using Wheatstone's Bridges

Huyart, B.; Wiedmann, Frank; Jallet, L.; Bergeault, E.; Benelbar, R.; Bosisio, R.G.

doi:10.1109/euma.1994.337332

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…1), this is why the structure shown in Fig. 4 [4] was used for the diode detectors. The two capacitors and at the input serve to isolate the SPR from the direct currents present in the detector.…”

Section: Realization In Mmic Technologymentioning

confidence: 99%

New structure for a six-port reflectometer in monolithic microwave integrated-circuit technology

Wiedmann

Huyart

Bergeault

et al. 1997

IEEE Trans. Instrum. Meas.

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Abstract-This paper presents a new structure for a six-port reflectometer which due to its simplicity can be implemented very easily in monolithic microwave integrated-circuit (MMIC) technology. It uses nonmatched diode detectors with a high input impedance which are placed around a phase shifter in conjunction with a power divider for the reference detector. The circuit has been fabricated using the F20 GaAs process of the GEC-Marconi foundry and operates between 1.3 GHz and 3.0 GHz.Index Terms-Diode detector, integrated circuit, monolithic microwave integrated-circuit (MMIC), phase shifter, power divider, six-port reflectometer, S-parameter measurement.

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Section: Realization In Mmic Technologymentioning

confidence: 99%

New structure for a six-port reflectometer in monolithic microwave integrated-circuit technology

Wiedmann

Huyart

Bergeault

et al. 1997

IEEE Trans. Instrum. Meas.

Self Cite

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“…3) [5] acts like a directional coupler: if the source, the DUT, a reactance ( or ), and the power detector are connected to four ports designated by 1 to 4, respectively, then ports 1 and 4 are isolated from each other, as well as ports 2 and 3. However, a signal coming from the DUT reaches the detector (port 2 to 4) and a signal from the source is reflected by the reactance (port 1 to 3) with a specific phase shift and, thereafter, reaches the detector (port 3 to 4), too.…”

Section: The Reflectometer Structuresmentioning

confidence: 99%

“…In this paper, the concept of lumped reflectors is extended to cover larger bandwidths. The lumped element reflector bridges for every detector [5] are separated by transmission lines giving an additional phase shift and resulting in a bandwidth enlarged by about a decade. Furthermore, one of the new SPR's contains no explicit reference detector, this is taken into account by a special mathematical algorithm.…”

Section: Introductionmentioning

confidence: 99%

Two new six-port reflectometers covering very large bandwidths

Hesselbarth

Wiedmann

Huyart

1997

IEEE Trans. Instrum. Meas.

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Abstract-This paper presents two new structures for six-port reflectometers with very large operating bandwidths of more than three decades, using a combination of lumped reflectors and transmission lines. Circuits working over a range of 2 MHz to 1300 MHz and 2 MHz to 2200 MHz have been built using inexpensive passive surface mount elements and Schottky detector diodes. Comparing results obtained from the new proposed structures with those obtained from a commercial network analyzer showed a worst case absolute value of 0.020 for the complex difference between the measured reflection coefficients. A convenient calibration procedure, for the entire band, is proposed using three standards and four approximately known loads.

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Six‐Port Networks

Bosisio

2005

Encyclopedia of RF and Microwave Engineering

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Software‐defined radio (SDR) has been identified as a potential method to enhance flexible wireless communication systems. The operation speed of an analog/digital converter (ADC) and processing ability of digital signal processing (DSP) chips are key factors in the development of SDR for useful commercial applications. More recent advances in semiconductor processing technology and the development of reconfigurable devices such as digital signal processors and field‐programmable gate arrays (FPGAs) reduce the development time of commercial products. SDR in conjunction with six‐port receivers has promising applications for use in wireless LANs, audio and television broadcasting, and interoperability between different radio services, as seen by new studies on the use of six‐port technology in various design aspects of a new SDR receiver. The objective is to realize an application of SDR to provide a multichannel, multimode wireless direct digital receiver. The combination of SDR and six‐port technology provides great flexibility in system configuration; significant reduction in hardware cost, particularly at millimeter‐wave frequencies; and potential for software reuse. The six‐port receiver approach offers wideband accommodation to ever‐changing communication specifications required in a SDR as much of its functionality is defined in software. Different types of six‐port circuits have been designed, with center frequencies at 2.4, 5.8, 24, and 28 GHz, operating over wide frequency bands. Some six‐port circuits are based on microstrip structures and are fabricated with hybrid microwave integrated circuit (MHMIC) or monolithic microwave integrated circuit (MMIC) technology at both microwave and millimeter‐wave frequencies. Other circuits use a novel substrate‐integrated waveguide (SIW) structure allowing integration of planar integrated circuit structure with waveguide structure. The performances of these six‐port circuits in digital receivers are reported in relation to signal modulation schemes, noise performance analysis calibration, and coding. Bit error rate simulation and measurement results obtained with demodulation algorithms are given for QPSK and QAM‐16 signals under a variety of operating conditions. Initial results show promising applications of six‐port technology for direct digital conversion demodulation reception, needed in future low‐cost SDR communication systems. Measurement and simulated demodulation results obtained with coding algorithms are also given.

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Microwave Measurement using Wheatstone's Bridges

Cited by 7 publications

References 4 publications

New structure for a six-port reflectometer in monolithic microwave integrated-circuit technology

New structure for a six-port reflectometer in monolithic microwave integrated-circuit technology

Two new six-port reflectometers covering very large bandwidths

Six‐Port Networks

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