Development of low-loss broad-band planar baluns using multilayered organic thin films

IET Microwaves, Antennas & Propagation

et al. 2016

Abstract:In this paper, we present the design and development of a novel ultra-wideband coupled line balun on a multilayer Liquid Crystal Polymer (LCP) substrate. The balun is designed using a quarter wavelength (λ/4) asymmetric broadside coupled line. The defected ground structure (DGS) and a lumped phase compensation circuit are developed to achieve wide bandwidth performance for the balun. The balun has a measured bandwidth ratio of 23:1, from 80 MHz to 1860 MHz. Within the operating bandwidth, the experimental results demonstrate that the balun achieves an input return loss of better than 10 dB, an insertion loss of better than 1 dB, an amplitude imbalance of better than ±0.4 dB and a phase imbalance of better than ±10 degrees. The size of the balun is 40.64 mm x 40.64 mm or 0.22 λg x 0.22 λg, where λg is the guided-wavelength at the center frequency of 970 MHz.

Section: Balun Prototype Simulation and Measurement Resultsunclassified

Section: Introductionmentioning

confidence: 99%

23:1 Bandwidth ratio quasi‐lumped component balun on a multilayer organic substrate

IET Microwaves, Antennas & Propagation

et al. 2016

“…Figure shows 3D view, cross‐section, and circuit layout of the balun on three different metal layers on multilayered liquid crystal polymer (LCP) . The two LCP layers have thickness of h 1 = 1 mil and h 2 = 8 mil.…”

Section: Configuration and Theoretical Circuit Analysismentioning

confidence: 99%

Novel stacked‐defected ground structures for ultra‐wideband low loss balun designs

Micro & Optical Tech Letters

2019

A novel stacked‐defected ground structure (SDGS) for ultra‐wideband and low‐loss balun design was developed. The balun implements an inductive compensation method on a multilayer liquid crystal polymer (LCP) substrate to control phase and amplitude imbalances. Based on a 15‐dB input return loss and 0.5 dB insertion loss criterions, the balun has a measured bandwidth from 70 MHz to more than 2.1 GHz, a measured amplitude and phase imbalances are less than 0.5 dB and 5°, respectively. With a compact size of 36 mm × 51 mm × 0.23 mm, the 0.5 dB loss‐balun achieves both the largest bandwidth ratio (30:1 ratio) and the most improved imbalances reported to date on a printed circuit board.

“…The low loss Teflon is Taconic's TF-260 which has a thickness of 1.7 mils, a dielectric constant of 2.6 and a loss tangent of 0.002. The thin dielectric layer was used to provide the required coupling between the broadside coupled microstrip lines of the balun [10]. The balun at the output of the amplifier operates from 9.5 GHz to 31.5 GHz.…”

Section: Power Amplifier Prototypementioning

confidence: 99%

High efficiency push-pull inverse class F power amplifier using a balun and harmonic trap waveform shaping network

Stameroff

2010 IEEE MTT-S International Microwave Symposium

Leoni

2010

We present the desi g n and development of a push pull inverse class F power amplifier in X band usin g a novel harmonic matchin g network. The harmonic matchin g network is realized by a simple, low-loss, Marchand balun and a harmonic trap circuit.This novel harmonic matching network not only provides 3-dB power combinin g , but also enables waveform shapin g for enhanced efficiency. This I-sta g e power amplifier using discrete GaAs pHEMTs achieves a measured saturated output power of 33 dBm with a power added efficiency of 63% and a g ain of 10 dB. This amplifier operates at 10 GHz with a 6% fractional bandwidth.Index Terms -Power amplifiers, power FET amplifiers, microwave power amplifiers, MODFET power amplifiers, power combiners.