| 1. |
- Carlsson, Erik F., 1968, et al.
(författare)
-
Conformal mapping of the field and charge distributions in multilayered substrate CPWs
- 1999
-
Ingår i: IEEE Transactions on Microwave Theory and Techniques. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9480 .- 1557-9670. ; 47:8, s. 1544 - 1552
-
Tidskriftsartikel (refereegranskat)abstract
- Conformal mapping (CM) and partial capacitance techniques are used for analytical evaluation of charge/current and electric- and magnetic-field distributions in a multilayered substrate coplanar waveguide (CPW) in the quasi-TEM approximation. The results, compared with finite-element method simulations, show that the magnetic wall assumed at the dielectric-dielectric interfaces in CM is a good approximation for many practical cases. The method is applied to a CPW with a thin ferroelectric film used in tunable microwave devices
|
|
| 2. |
- Gevorgian, Spartak, 1948, et al.
(författare)
-
CAD models for multilayered substrate interdigital capacitors
- 1996
-
Ingår i: IEEE Transactions on Microwave Theory and Techniques. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9480 .- 1557-9670. ; 44:6, s. 896 - 904
-
Tidskriftsartikel (refereegranskat)abstract
- Conformal mapping-based models are given for interdigital capacitors on substrates with a thin superstrate and/or covering dielectric film. The models are useful for a wide range of dielectric constants and layer thicknesses. Capacitors with finger numbers n⩾2 are discussed. The finger widths and spacing between them may be different. The results are compared with the available data and some examples are given to demonstrate the potential of the models
|
|
| 3. |
- Gevorgian, Spartak, 1948, et al.
(författare)
-
CAD Models for Shielded Multilayered CPW
- 1995
-
Ingår i: IEEE Transactions on Microwave Theory and Techniques. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9480 .- 1557-9670. ; 43:4, s. 772-779
-
Tidskriftsartikel (refereegranskat)abstract
- Conformal mapping technique is used to obtain CAD oriented closed form analytical expressions for characteristic impedance per unit length capacitance and relative effective dielectric permittivity of top and bottom shielded multilayered coplanar waveguides (CPW). Analytical expressions are deduced for a wide verity of CPW structures
|
|
| 4. |
- Gevorgian, Spartak, 1948, et al.
(författare)
-
Lower order modes of YBCO/STO/YBCO circular disk resonators
- 1996
-
Ingår i: IEEE Transactions on Microwave Theory and Techniques. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9480 .- 1557-9670. ; 44:10, s. 1738 - 1741
-
Tidskriftsartikel (refereegranskat)abstract
- Lower order modes in a single crystal strontium titanate (STO) circular disk resonator are studied experimentally. Superconducting epitaxial YBCO films form the parallel-plates of the resonator. Due to the extremely high dielectric constant of STO, the electric fields are concentrated between the plates, while there is a substantial magnetic fringing field which affects both the resonant frequencies, Q-factors, and tunability of all modes, especially the TM110 and TM210
|
|
| 5. |
- Räisänen, Antti, et al.
(författare)
-
A single barrier varactor quintupler at 170 GHz
- 1995
-
Ingår i: IEEE Transactions on Microwave Theory and Techniques. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9480 .- 1557-9670. ; 43:3, s. 685-688
-
Tidskriftsartikel (refereegranskat)abstract
- InGaAs-InAlAs single-barrier varactor (SBV) diodes are tested as frequency quintuplers. The diodes were tested in a crossed-waveguide structure and provided output frequencies between 148 and 187 GHz. The highest observed flange-to-flange efficiency was 0.78% at an output frequency of 172 GHz. This is nearly four times greater than the best quintupler efficiency obtained for previous SBV varactors made from the GaAs-AlGaAs materials system.
|
|
| 6. |
- Bruce, SPO, et al.
(författare)
-
Design and realization of a millimeter-wave Si/SiGe HBT frequency multiplier
- 1998
-
Ingår i: IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 0018-9480. ; 46:5, s. 695-700
-
Tidskriftsartikel (refereegranskat)abstract
- In this paper, the design of an active millimeterwave frequency doubler using an Si/SiGe heterojunction bipolar transistor (HBT) as the active device is studied. Simulations are made using a developed physics-based large-signal model for Si/SiGe HBT's, wh
|
|
| 7. |
- Sihvola, Ari, et al.
(författare)
-
Non-radiating sources in time-domain transmission-line theory
- 1997
-
Ingår i: IEEE Transactions on Microwave Theory and Techniques. - : Institute of Electrical and Electronics Engineers (IEEE). - 0018-9480. ; 45:12 Part 1, s. 2155-2159
-
Tidskriftsartikel (refereegranskat)abstract
- The concept of nonradiating (NR) sources is introduced to transmission lines in the time-domain analysis. A method is presented to construct localized voltage and current sources which do not produce any fields outside the source domain. These sources cannot, therefore, be detected by measurements made outside the source region. The importance of such sources for the uniqueness of the inverse-source problem is pointed out, and energy conditions for the uniqueness are discussed. The analysis can be advantageously used in the design and optimization of the electromagnetic compatibility (EMC) properties of transmission lines
|
|
