Analyzing Lossy Radial-Line Stubs (Short Papers)

March, S.L.

doi:10.1109/tmtt.1985.1132997

Cited by 46 publications

(18 citation statements)

References 2 publications

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“…Accuratp but more complicated expressions have been given by Giannini et al [141 and show very good agreement with experiments. Theoretical formulas fpr lossy radial stubs have been given by March [15] and Giannini et al [16]. The model given here is valid for superconducting as well as nornal metal radial stubs.…”

Section: The Supercondnucting Microstrip Linementioning

confidence: 95%

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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: 95%

“…[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%

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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“…In the case of small loss ( ), the Bessel functions in (1) can be evaluated approximately by [23] or (3) The -parameters of TCPW and TCPS are computed by the matrices in (2). Additional handling is required for the part TSLO, which denotes the aperture radially fanned out from the upper slot of ACPW to the open region with angle .…”

Section: A Equivalent-circuit Modelmentioning

confidence: 99%

Analysis of coplanar waveguide-to-coplanar stripline transitions

Mao

Hwang

et al. 2000

IEEE Trans. Microwave Theory Techn.

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Abstract-The coplanar waveguide (CPW)-to-coplanar stripline (CPS) transition is analyzed theoretically and experimentally in this paper. To characterize this transition in the lower frequency band, a simple equivalent-circuit model that consists of uniform and nonuniform transmission lines is established. The elements of this model can all be obtained by the closed-form formulas; hence, this model is suitable for computer-aided-design application. This model is then applied to design and analyze the CPW-to-CPS transitions with various structure parameters. In the higher frequency band, the partially prizm-gridded finite-difference time-domain (FDTD) method is employed to take into account the bond-wire effect as well as the surface-wave leakage and space-wave radiation associated with the transition. In this study, results based on equivalent-circuit model, FDTD simulation, and measurement are compared. Good agreement among these results supports the usefulness of the proposed equivalent-circuit model and also validates the FDTD method. By using the equivalent-circuit model to optimize the transition configuration, the CPW-to-CPS transition with broad bandwidth and low insertion loss may be achieved.

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“…It is adopted to remove undesired harmonics or spurious of the nonlinear circuits in RF front-end. Wide stopband and high stopband rejection are important for LPF to improve the linearity and signal over noise ratio especially in the high data rate and wideband communication systems [1][2][3][4][5][6][7][8][9][10][11][12]. A good LPF is needed to suppress the mixed frequency elements and leakages of radio frequency (RF) and local oscillator (LO) frequency from the mixer.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, defected ground structure (DGS) usage in the LPFs for wide stopband has been demonstrated [4][5][6]. A new low pass configuration using transformed radial stubs (TRS), formed by the coupled line transformer connected with a radial stub (the radial stub has intrinsic wide stopband characteristics [7,8]), is proposed in [9,10]. The implemented LPF with a planar configuration and free of lumped resistor-inductor-capacitor (R-L-C) elements demonstrates an ultra-wide stopband stopband rejection better than 25 dB up to 24 GHz (8 f c ).…”

Section: Introductionmentioning

confidence: 99%

Radial Loaded Transformed Radial Stub for LPF Stopband Extension

Ma¹,

Mou²,

Wang³

et al. 2012

PIER Letters

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Abstract-A low pass filter with ultra-wide band rejection and compact size using a proposed radial loaded transformed radial stubs is introduced and investigated. The implemented unite cell low pass filter with 1-dB cutoff frequency f c of 3.2 GHz demonstrates stopband rejection up to 11.8 f c , i.e., 38 GHz. The design is further extended to the high-order LPF through cell cascading. The implemented four-cell LPF with f c of 3.6 GHz demonstrated 35 dB rejection from 4.8 GHz to 39 GHz, 50 dB rejection from 5.4 GHz to 26 GHz (7.2 f c ) and 20 dB rejection from 4.4 GHz to 50 GHz (13.8 f c ). The measured passband insertion loss is less than 1.7 dB, and group delay is 0.45 ∼ 0.8 nS. The size of the four-cell low pass filter is only 0.33λ g × 0.135λ g , (λ g is the guide wavelength at center cutoff frequency) without using any lumped elements.

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Analyzing Lossy Radial-Line Stubs (Short Papers)

Cited by 46 publications

References 2 publications

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

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

Analysis of coplanar waveguide-to-coplanar stripline transitions

Radial Loaded Transformed Radial Stub for LPF Stopband Extension

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