Microstrip line directional couplers with high directivity

Chun, Young-Hoon; Moon, Ju-Young; Yun, Sang‐Won; Rhee, Jin‐Koo

doi:10.1049/el:20040186

Cited by 40 publications

(31 citation statements)

References 2 publications

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“…The UWB filter is one of the essential components of a UWB system and presents new challenges for the design of filters for such systems, as the required fractional bandwidth is approximately 110%, which makes traditional filter design techniques inapplicable. Research in this area has increased in the recent past, and as a result, a number of planar filters with different geometries have been experimentally characterized [1,2]. However, in practical applications, UWB BPF designs still encounter many challenges.…”

Section: Discussionmentioning

confidence: 99%

A wide stopband microstrip bandpass filter with stepped coupled lines

Tang

Teng

2014

Micro & Optical Tech Letters

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This study develops a microstrip bandpass filter with a broader stopband. The proposed bandpass filter is constructed by cascading three stepped coupled lines and two short-circuited stubs. Moreover, quarter-wavelength electrical lengths and weak strong-weak couplings are adopted for the stepped coupled line. In this way, a compact circuit size and a wide stopband can be achieved readily. In addition, the short-circuited stubs connected to the input/output port can result in a steeper passband skirt and a broader passband. Finally, a design example is provided to show the availability of the proposed structure.

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Section: Discussionmentioning

confidence: 99%

A wide stopband microstrip bandpass filter with stepped coupled lines

Tang

Teng

2014

Micro & Optical Tech Letters

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“…Then the spacing ratio s/h can be found as   (8) where ε eff can be calculated using (9) as given in [14] …”

Section: Design Of Microstrip Couplermentioning

confidence: 99%

“…The Epsilon negative transmission line [7] was used but it needs more number of unit cells to improve the accuracy, which leads to fabrication difficulty. Delay lines [8] were used, but the coupler occupies more space than the conventional one. The Re-entrant mode structure [9], periodic metallic cylinders [10], and metamaterial [11] were also reported to improve the isolation, where the coupler construction is complex.…”

Section: Introductionmentioning

confidence: 99%

High Directivity Microstrip Coupler Using Variable Width Structure

Maheswari¹,

Jayanthy²

2014

IOSRJECE

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“…Although the formulas of Cristal are intended for homogeneous media, the low permittivity used for the substrate (Rogers Duroid 5880, r=2.2) causes only a small discrepancy with respect to the theoretical case. If a higher permittivity is employed, the coupler results in a poorer directivity, though optimization or compensation can still be performed [14]- [15].…”

Section: Microstrip Designmentioning

confidence: 99%

A novel reconfigurable coupler for intelligent SOP RF front-ends

Marcaccioli

Lugo²,

Tentzeris³

et al. 2005

2005 European Microwave Conference

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-A novel class of planar reconfigurable directional couplers for intelligent System on Package (SOP) RF front-ends is presented. Reconfigurability is obtained by modifying the electrical parameters of the coupled lines so as to tune the coupling ratio. RF switches such as MEMS or PIN diodes can be used to enable a wide range of reconfigurability in a very compact and low-loss device. The performance and the limitations of the coupler are discussed and design equations are provided. A hardwired prototype in microstrip technology has been manufactured. The novel concept introduced, however, is technology independent so that the reconfigurable coupler can be fabricated in microstrip, stripline or coplanar configurations.

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Microstrip line directional couplers with high directivity

Cited by 40 publications

References 2 publications

A wide stopband microstrip bandpass filter with stepped coupled lines

A wide stopband microstrip bandpass filter with stepped coupled lines

High Directivity Microstrip Coupler Using Variable Width Structure

A novel reconfigurable coupler for intelligent SOP RF front-ends

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