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- Kuylenstierna, Dan, 1976, et al.
(författare)
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BROADBAND SMALL SIZE BALUN BUILT WITH LUMPED COMPONENTS
- 2003
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Ingår i: Gigahertz 2003 Proceedings. - 0780383311
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper reports on a small size broadband lumped element balun suitable for integration in MMICs. The design is an extension of the well known lattice balun, which independent of frequency has 180 degrees phase difference between the output ports, but suffers from a narrow amplitude bandwidth. It is shown how the amplitude bandwidth of the lattice balun may be improved by replacing inductors with low-pass T-sections, and the capacitors with high-pass T-sections. Scalable closed-form design equations for various bandwidths are derived. To validate the concept a prototype operating at 1 GHz has been fabricated with SMT chip components soldered on a PTFE laminate. It exhibits amplitude balance better than +or-0.25 dB and phase balance better than +or-8 degrees , over more than one octave bandwidth. The effective chip-area is 7*9 mm/sup 2/
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- Kuylenstierna, Dan, 1976, et al.
(författare)
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Design of broad-band lumped-element baluns with inherent impedance transformation
- 2004
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Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480 .- 1557-9670. ; 52:12, s. 2739-45
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Tidskriftsartikel (refereegranskat)abstract
- This paper reports on a novel lumped balun topology, the second-order lattice balun, with broad-band performance. The design is based on synthetic transmission lines operating as impedance transformers. The characteristic impedance of the synthetic transmission lines may be chosen to obtain inherent impedance transformation. An analytical investigation results in closed formulas for optimum performance over a given bandwidth. It is shown that it is possible to design for equal ripple in amplitude balance and input reflection coefficient. The phase balance is theoretically perfect over the entire bandwidth. The concept is experimentally validated by a 1-GHz prototype fabricated with surface mounted chip components. It exhibits an amplitude balance better than 0.5 dB and a phase balance better than +or-8 degrees over an octave bandwidth. The effective area of the prototype is 7 * 9 mm/sup 2/
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- Kuylenstierna, Dan, 1976, et al.
(författare)
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Design of broadband lumped element baluns
- 2004
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Ingår i: 2004 IEEE MTT-S International Microwave Symposium Digest, 6-11 June 2004. - 0780383311 ; Vol.2, s. 899-902
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Konferensbidrag (refereegranskat)abstract
- This paper reports on a small size broadband lumped element balun suitable for integration in MMICs. The design is an extension of the well known lattice balun, which independent of frequency has 180 degrees phase difference between the output ports, but suffers from a narrow amplitude bandwidth. It is shown how the amplitude bandwidth of the lattice balun may be improved by replacing inductors with low-pass T-sections, and the capacitors with high-pass T-sections. Scalable closed-form design equations for various bandwidths are derived. To validate the concept a prototype operating at 1 GHz has been fabricated with SMT chip components soldered on a PTFE laminate. It exhibits amplitude balance better than +or-0.25 dB and phase balance better than +or-8 degrees , over more than one octave bandwidth. The effective chip-area is 7*9 mm/sup 2/
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- Kuylenstierna, Dan, 1976, et al.
(författare)
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Ferroelectrically tuneable delay lines
- 2004
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Ingår i: Conference Proceedings. 34th European Microwave Conference, 12-14 Oct. 2004. ; vol.1, s. 157-60
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Konferensbidrag (refereegranskat)abstract
- Ferroelectric (Ba/sub 0.25/Sr/sub 0.75/TiO/sub 3/) varactors are integrated on a Si substrate to form compact wideband true-time tuneable delay lines. The delay-line design is of the lumped element approach, implemented as a synthetic coplanar strip (CPS) line. The physical size of the delay lines is 2.0*0.33 mm/sup 2/. Up to 20 GHz, the measured delay time per unit length is approximately constant equal to 40 ps/mm (corresponding to a slow wave factor of 12) and the losses are about 0.049 dB/ps. The tuneability under 30 V DC-bias is 10%
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