Design of Compact Directional Couplers for UWB Applications

Abbosh, Amin; Bialkowski, M.E.

doi:10.1109/tmtt.2006.889150

Cited by 209 publications

(161 citation statements)

References 13 publications

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“…Applying the same criteria, the bandwidth ratio for the proposed coupler will be approximately 3.2. This shows that the proposed coupler has a bandwidth comparable to [12] despite being a two-layer device. At the same time, the proposed coupler offers similar performance in terms of insertion loss, reflection coefficient and isolation.…”

Section: Resultsmentioning

confidence: 83%

“…The required spacing and tolerance can be difficult for practical implementation, especially when tight coupling is required for substrate with low dielectric constant. The bandwidth ratio for 10 dB ± 1.5 dB coupling coefficient of the three-layer broadside coupler in [12] is approximately 3.4. Applying the same criteria, the bandwidth ratio for the proposed coupler will be approximately 3.2.…”

Section: Resultsmentioning

confidence: 92%

“…The problem of narrow spacing can be alleviated by using broadside coupled structure [11][12][13]. However, these circuits require multilayer substrates which are inconvenient to manufacture.…”

Section: Introductionmentioning

confidence: 99%

“…Multilayer design is also sensitive to alignment error. Misalignment of the microstrip layers forming this type of coupler may lead to high insertion loss [12].…”

Section: Introductionmentioning

confidence: 99%

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A Semi-Elliptical Wideband Directional Coupler

Lo¹,

Chung²,

Lim³

2017

PIER C

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Abstract-A new design of wideband directional couplers using a semi-elliptical edge-coupled structure is presented. This structure consists of two semi-elliptical patches on the top layer and an elliptical defected ground plane on the bottom layer to increase the coupling coefficient and operating bandwidth. Even and odd mode analysis is performed, and sets of design graphs are formulated to facilitate the design of the coupler on substrate with dielectric constants of 2.2 and 3.38. The operating frequency and coupling are controlled by the dimensions of the elliptical patch and the size of the air gap. Compared to the conventional parallel-microstrip coupler which requires extremely narrow air gap to achieve tighter coupling factor, the semi-elliptical coupler allows for wider air gap to be used, and it reduces fabrication difficulty. Both simulation and measurement results show that the proposed design exhibits wideband characteristic with a bandwidth ratio of more than 2.4 with a coupling deviation of ±1 dB.

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Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

“…Multilayer design is also sensitive to alignment error. Misalignment of the microstrip layers forming this type of coupler may lead to high insertion loss [12].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Semi-Elliptical Wideband Directional Coupler

Lo¹,

Chung²,

Lim³

2017

PIER C

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show abstract

“…The input and output ports of these power dividers are coplanar. However, it is not suited to use in some fields, such as the six-port junction [13][14][15] including non-coplanar couplers [16][17][18]. In addition, the six-port technique is a suitable option as the ratio of complex amplitude measurements [19], and has been applied in many fields [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%