Broadband Direction-Finding Antenna Using Suspended Microstrip-Line Hybrid Coupler for Handheld Devices

Bulus, Umut; Kizilbey, Oguzhan; Aniktar, Hüseyin; Güneş, Ahmet

doi:10.1109/lawp.2013.2242840

Cited by 8 publications

(3 citation statements)

References 11 publications

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“…2. In this work, a ultra wideband and low loss 180 • hybrid coupler is used derived from wilkinson power divider where the output ports are combined with (λ/4) phase inverting and non-inverting suspended microstrip lines (SMLs) [7]. With this technique frequency sensitivity of the 180 • hybrid coupler was decreased.…”

Section: Realization Of the Balanced Pamentioning

confidence: 99%

3.5-3.8GHz class-E balanced GaN HEMT power amplifier with 20W Pout and 80% PAE

Kizilbey

Palamutcuogullari

Yarman³

2013

IEICE Electron. Express

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Abstract:In this study, balanced and single ended class-E power amplifiers (PAs) were designed and realized for 3.5-3.8 GHz band by using Gallium Nitride high electron mobility transistor (GaN HEMT). Realizations were made on low loss Rogers RT5880 dielectric material which has 0.254 mm thickness and 2.2 dielectric constant. Proposed balanced class-E PA has approximately 20 W (43 dBm) output power with 80% peak power added efficiency (PAE) and shows a very favorable combination of output power, PAE and suppressed even order harmonics compared to the single ended class-E PA prototype.

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Section: Realization Of the Balanced Pamentioning

confidence: 99%

3.5-3.8GHz class-E balanced GaN HEMT power amplifier with 20W Pout and 80% PAE

Kizilbey

Palamutcuogullari

Yarman³

2013

IEICE Electron. Express

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“…Microstrip rat‐race couplers (RRCs) are vital components used widely in many practical microwave/RF circuits, such as antenna array feeding networks , Butler matrixes , phase inverters , and others . A hybrid RRC realization offers an equal power splitting between the output ports with either 180° or 0° phase shift.…”

Section: Introductionmentioning

confidence: 99%

A compact microstrip rat-race coupler constituted by nonuniform transmission lines

Bekasiewicz

Kurgan

2014

Microw. Opt. Technol. Lett.

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In this work, a step‐by‐step development of a compact microstrip rat‐race coupler (RRC) has been presented and discussed. A high degree of miniaturization has been obtained by substituting six quarter‐wavelength uniform atomic building blocks of a RRC by their nonuniform counterparts. The miniaturization procedure has been realized in three progressive steps: (i) the first layout solution of a miniaturized RRC has been acquired using an accurate mathematical model of a nonuniform transmission line (NUTL); (ii) the second layout solution has been obtained by a manual refinement and electro‐magnetic (EM) fine‐tuning of the NUTL geometry aimed at the utilization of the interior of the RRC in a highly efficient manner; (iii) the final layout, occupying only 8.5% estate area in comparison to a conventional RRC, is the result of the EM optimization. The experimental results confirm the theoretical predictions, proving the vital usefulness of the approach. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:970–974, 2014

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“…Hybrid 90 • couplers are key components to divide or combine signals with a proper phase difference which are widely implemented in radio frequency (RF) devices, such as power amplifiers, mixers, and antenna systems [1][2][3][4]. As couplers are generally designed based on the electrical length of a desired fundamental signal, higher order harmonic signals from those nonlinear devices will degrade the quantity of the desired signal.…”

Section: Introductionmentioning

confidence: 99%

Bandwidth Improvement of a Compact Quadrature Hybrid Coupler With Harmonic Rejection Using Lumped Elements

Li²,

Gu³

et al. 2013

PIER C

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Abstract-A compact quadrature hybrid coupler with harmonic suppression using lumped-element band-stop resonator is proposed for bandwidth improvement. Conventionally, harmonic rejection is realized by three band-stop resonators in lumped hybrids. The using of three band-stop resonators realizes better harmonic suppression while exhibiting narrower frequency response. So as to improve operation bandwidth behavior, the number of band-stop resonator applied in the proposed topology is minimized to one. Trading off with acceptable reduction in harmonic rejection, the proposed hybrid enlarges working bandwidth with fewer numbers of lumped devices. Detailed design and theoretical analysis are presented and the expressions of lumped elements with dependence of rejected frequency are obtained. To validate the analysis, three 2.45 GHz couplers are fabricated on an FR-4 printed circuit board. The experimental results exhibit 27.3%, 26.9% and 23.3% operation bandwidth with better than 16 dB, 17 dB, and 21 dB harmonic suppressions at 4.9 GHz, 6.1 GHz, and 7.35 GHz, respectively. Less than 0.8 dB amplitude imbalance and 2 • phase error are achieved for all the three couplers, which are matched well with theoretical analysis.

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Broadband Direction-Finding Antenna Using Suspended Microstrip-Line Hybrid Coupler for Handheld Devices

Cited by 8 publications

References 11 publications

3.5-3.8GHz class-E balanced GaN HEMT power amplifier with 20W Pout and 80% PAE

3.5-3.8GHz class-E balanced GaN HEMT power amplifier with 20W Pout and 80% PAE

A compact microstrip rat-race coupler constituted by nonuniform transmission lines

Bandwidth Improvement of a Compact Quadrature Hybrid Coupler With Harmonic Rejection Using Lumped Elements

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