A novel microwave periodic structure — the ladder microstrip line

Lancaster, M.J.

doi:10.1002/mop.4650090413

Cited by 12 publications

(7 citation statements)

References 7 publications

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“…However, to simplify the fabrication process and to maintain the low cost, the slow-wave structures with only a single-layer substrate are more preferable [9]- [20]. They can be realized on a single-layer substrate with a periodic dielectric constant [9], or they have the periodic perturbations on the signal and ground planes [10]- [20]. Nonetheless, they may not have a simple and efficient synthesis method so that the try and error procedure would be necessary for the prescribed characteristic impedance and slow-wave factor.…”

Section: Table I Comparison Of Microstrip Slow-wave Structuresmentioning

confidence: 99%

A High Slow-Wave Factor Microstrip Structure With Simple Design Formulas and Its Application to Microwave Circuit Design

Chang

2012

IEEE Trans. Microwave Theory Techn.

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This paper proposes a new microstrip slow-wave structure. The unit cell comprises a Schiffman section of meander line and a shunt open-circuited stub. No via-holes and ground-plane patterns are required. Simple design formulas can be used to obtain line parameters, such as the characteristic impedance and phase velocity. According to the analysis, the characteristic impedance and slow-wave factor of the proposed slow-wave line can be independently controlled by merely two layout parameters. The proposed uniplanar structure only requires a single-layer substrate and is simply constructed using the conventional printed circuit board manufacturing process. A branch-line and a rat-race coupler were designed and fabricated using the proposed structure to demonstrate its feasibility. Their sizes are only 8.49% and 4.87% of the conventional ones, respectively. This novel slow-wave structure should find wide applications in compact microwave circuits.

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Section: Table I Comparison Of Microstrip Slow-wave Structuresmentioning

confidence: 99%

A High Slow-Wave Factor Microstrip Structure With Simple Design Formulas and Its Application to Microwave Circuit Design

Chang

2012

IEEE Trans. Microwave Theory Techn.

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“…This is achieved by modifying electric and magnetic energy storage in the guided-wave media. A so-called ladder microstrip line, that has rectangular slots periodically cut along microstrip, was proposed in [5] and showed good size reduction. It was indicated that a smaller pitch and wider line can achieve further size reduction.…”

Section: Pbg Slow-wave Structure Designmentioning

confidence: 99%

“…However, this methodology is not suited for CMOS designs where fabrication limitations on metal lines width and space do not permit wide lines with narrow slots. Another reason why the approach in [5] is not suited for CMOS processes is because CMOS chipsets comprise of a thick-metal thin-substrate layer built upon a lossy silicon, and wider microstrip lines result in more coupling in the substrate and more transmission loss.…”

Section: Pbg Slow-wave Structure Designmentioning

confidence: 99%

“…Though mm-wave passive components have much smaller size due to the millimeter level guided wavelength at which they operate, yet in a modern transceiver system integrated passive components occupy most die area and take up the largest portion of the chip production cost. Some slow-wave structures such as PBG [2][3][4] and ladder microstrip lines [5] have been studied in microwave and mm-wave ranges to reduce passive dimensions. However, due to the lossy nature of the silicon, the thick-film thin-substrate metal layer stackup, and the stringent design rules of CMOS technology [6], implementing slow-wave structures to reduce passive size with minimal increased transmission loss on CMOS remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

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A novel slow-wave structure for millimeter-wave filter application on bulk CMOS

Yang

Skafidas

Evans

2011

2011 IEEE Radio and Wireless Symposium

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A novel slow-wave structure for microstrip lines is proposed. Unlike conventional slow-wave structures such as photonic bandgap (PBG) and ladder microstrip lines, which only deal with the substrate, ground plane or the signal line of a microstrip separately, the periodic patterns of this new slow-wave structure are etched in both the conductive metal strip and the ground plane of the proposed microstrip line. No extra drilling through the substrate is required. The designed slow-wave structure exhibits that size reduction and minimal loss increase can be achieved simultaneously. 2ndorder rectangular open-loop filters with and without implementing the proposed slow-wave structure have been designed and fabricated in the millimeter-wave (mm-wave) range on 65-nm bulk CMOS. Both simulations and measurements demonstrate the new design has a 52.7% size reduction with only 0.5 dB penalty in transmission loss. To author's best knowledge this compact filter is the first reported mm-wave filter using slow-wave structure on bulk CMOS. Index Terms -CMOS, filter, microstrip, millimeter wave, (photonic bandgap) PBG, slow-wave, 60 GHz. 1. The passband was measured with 1-dB bandwidth. 2. The passband was measured when the return loss is better than 15 dB. 3. The passband was measured with 3-dB bandwidth. 4. The passband was measured with 5-dB bandwidth.

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“…To make this filter applicable for cellular communications, Zhang designed this aligned parallelcoupled filter onto a special superconducting material [6]. Later, Hong and Lancaster proposed a new type of microstrip filter called Ladder microstrip line structures, which can reduce the size of half-wavelength resonator filter [7]. There are also many other various designs based on parallel-coupled line such as cascaded parallelcoupled, zig-zag parallel-coupled, hairpin-line, hairpincomb, etc.…”

Section: Introductionmentioning

confidence: 99%

A microstrip diplexer filter using stepped-impedance resonators

Puttadilok

Eungdamrong

Amornsaensak

2008

2008 SICE Annual Conference

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Parallel coupled-line filter covers odd and even wave coupling of transmission lines. Cascading parallel coupled-line sections gives rise to a bandpass filter structure. Since conventional parallel coupled-line filter has poor spurious response and isolation performance, step impedance technique is added to improve its performance. A new Zig-Zag diplexer filter using stepped-impedance resonators is proposed in this paper. This diplexer filter has a narrow-band bandwidth, high isolation between its terminals, and operates at 2.4 GHz and 5GHz, which are the frequencies for Wireless LAN applications. The simulation results show that this microstrip filter has excellent performance on return loss, insertion loss, and isolation.

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A novel microwave periodic structure — the ladder microstrip line

Cited by 12 publications

References 7 publications

A High Slow-Wave Factor Microstrip Structure With Simple Design Formulas and Its Application to Microwave Circuit Design

A High Slow-Wave Factor Microstrip Structure With Simple Design Formulas and Its Application to Microwave Circuit Design

A novel slow-wave structure for millimeter-wave filter application on bulk CMOS

A microstrip diplexer filter using stepped-impedance resonators

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