A Broad-Band Element for Microstrip Bias or Tuning Circuits (Short Papers)

Syrett, Barry

doi:10.1109/tmtt.1980.1130193

Cited by 41 publications

(12 citation statements)

References 4 publications

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“…THE RADIAL STUB Some simple expressions of the impedance at the input of a lossless, radial stub using normal etl conductors have been given by Ramo et ald [1] and used by Vinding [11], Syrett [12] and Atwater - [13]. Accuratp but more complicated expressions have been given by Giannini et al [141 and show very good agreement with experiments.…”

Section: The Supercondnucting Microstrip Linementioning

confidence: 99%

“…It uses effective dimensions to account for t fringing fields which are used along with the formulas given in Ref. [10], [1 ] and [12] Using the fonralism of Ref. [10] tnd [15], the impedance at the input of the radial stub, which is the ,connection plane between the radial stub and the microstrip line, is:…”

Section: The Supercondnucting Microstrip Linementioning

confidence: 99%

“…Zriai(r.) = jZ4(r~) No(-jy ri) J(& yro) -JO3 y r,) N(j yro) (12) N1(-j yri) J1(-j yr) -J1(-j yri) NQ (j yro) where the Jn and Nn are respectively the Bessel functions of the fist. and second kdnd of order n. jr and ro are respectively the internal and extenal radii of the stub (see figure 3).…”

Section: The Supercondnucting Microstrip Linementioning

confidence: 99%

“…4(r) and y are defined by equations (7), (8) and (10) where eeff must be replaced by 6r and weff by a r which is the equivalent "width" of the radial stub at radius r, a is the angle of the radial stub. One can notice that equation (12) reduces to the formulas of Ref- [10], [11] and [12] when losses are neglected for a normal metal radial stub. The internal radius ri is related to the width w of the micrdstripline by: sinlh where weff is the effective width corresponding to the width w of the line connected to the radial stub and is given by equation (9).…”

Section: The Supercondnucting Microstrip Linementioning

confidence: 99%

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Superconducting RF tuning circuits for low-noise submillimeter wave SIS receivers

Febvre

McGrath

Bumble

et al. 1994

24th European Microwave Conference, 1994

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Heterodyne receivers using SIS (Superconductor-Insulator-Superconductor) junctions are the most sensitive receivers for radioastronomy in the millimeter wave and submillimeter wave frequency range. These instruments use superconducting RF tuning circuits to resonate out the high shunt capacitance of the SIS junction in order to provide a good impedance match with the microwave envionment at the frequency of operation. An accurate model to detennine the electrical propeties of impedance matching circuits has been developed. An analysis of superconducting microstrip lines and radial stubs taking into account the fringing fields of the thick electrode, the step discontinuities, and the Mattis-Bardeen complex conductivity for the superconductor surface impedance is presented. This model is used to calculate the resonance frequencies of the matching circuit with the capacitively-'shunted SIS junction. Good agreement is found between calculated and experimentally measured resonance frequencies at 550-600 GHz. MRRDCrIONThe most -sensitive heterodyne receivers used for millimeter wave and submillimeter wave radioastronomy employ superconductor-insulator-superconductor (SIS) tunnel junctions as the nonlinear mixing element. A submillimeter wave SIS heterodyne receiver for 547 GHz based on a waveguide mixer has been designed, its performance has been reported elsewhere by Febvre et al [1].It uses high current density submicron Nb-AlO-Nb tunnel junctions. The large intrinsic capacitance of the junction which shunts the signal away from the nonlinear conductance at high fiequencies must be properly tuned for optimum performance. This is accomplished through the use of integrated superconducting Nb matching circuits to match the complex impedance of the junction to the available tuning range of the waveguide mixer mount. Microstrip technology has been chosen for the RF tuning circuits for its compatibility with the SIS junction fabrication process. Two different types of integrated RF circuits, a series transformer and a parallel inductance, have been designed. An example of each type of circuit designed for 547 GHz is shown in figure 1 and figure 2. Nb Ba Eectrode Nb B Elayo Nb Counts Eletrode S (b) (b) o nN JnJiuon R0 Ntub -Nb W69<)6u&u&29=XX&Xa Nb F 1: SlS am junefon wih an hd miastip fr c i egur 2:51$ tunnel junction with an integrated puarale mcostn tuning drcuht. (a) Top view showing Waeison Nu blmerar. aTop view showing transmission in. dimenios. (b) Cease seaSon view shoin ?m topology.b Cross secton view showing film topology. 1430

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Section: The Supercondnucting Microstrip Linementioning

confidence: 99%

Section: The Supercondnucting Microstrip Linementioning

confidence: 99%

Section: The Supercondnucting Microstrip Linementioning

confidence: 99%

Section: The Supercondnucting Microstrip Linementioning

confidence: 99%

See 2 more Smart Citations

Superconducting RF tuning circuits for low-noise submillimeter wave SIS receivers

Febvre

McGrath

Bumble

et al. 1994

24th European Microwave Conference, 1994

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“…Usually, radial stubs are used in bias-T as the band-stop resonator [2][3][4]. Conventional straight stubs are not desirable at higher frequencies and low characteristic impedances, since the bandwidth of lines become a fraction of wavelength, which in turn causes excitation of unwanted modes [5].…”

Section: Introductionmentioning

confidence: 99%

A new compact biasing circuit for active integrated antenna and MMIC applications

Dehbashi

Oskouei

Forooraghi

2006

2006 IEEE Antennas and Propagation Society International Symposium

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A Spoof Surface Plasmon Transmission Line Loaded with Varactors and Short‐Circuit Stubs and Its Application in Wilkinson Power Dividers

Zhang

Tang

Zhang

et al. 2018

Adv Materials Technologies

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A tunable spoof surface plasmon transmission line (SSP‐TL) is proposed and investigated, which is periodically loaded with varactors and short‐circuit stubs. Compared with the common SSP‐TL with open‐circuit stubs, the proposed SSP‐TL exhibits better compactness and higher tunability. The dispersion and impedance features are analyzed using the T‐matrix method. The proposed SSP‐TL can also be biased in a conventional microstrip bias circuit, and seamlessly integrated into microstrip circuits. As applications, a frequency‐reconfigurable and compact Wilkinson power divider is designed and fabricated using the proposed SSP‐TL as the λ/4 impedance transformer around 1 GHz, which is validated by both numerical and experimental results. It is shown that 35% (or 20%) frequency tunability is achieved in simulated (or measured) results, reducing the footprint to 46% of the conventional microstrip one.

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A Broad-Band Element for Microstrip Bias or Tuning Circuits (Short Papers)

Cited by 41 publications

References 4 publications

Superconducting RF tuning circuits for low-noise submillimeter wave SIS receivers

Superconducting RF tuning circuits for low-noise submillimeter wave SIS receivers

A new compact biasing circuit for active integrated antenna and MMIC applications

A Spoof Surface Plasmon Transmission Line Loaded with Varactors and Short‐Circuit Stubs and Its Application in Wilkinson Power Dividers

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