Theory of Polarization-Selective Coupling and Its Application to Design of Planar Orthomode Transducers

Sakr, Ahmed A.; Dyab, Walid; Wu, Ke

doi:10.1109/tap.2017.2778015

Cited by 14 publications

(6 citation statements)

References 32 publications

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“…Also, daclatasvir + ribavirin for genotype 1 and interferon for genotype 2 gave an undetectable viral load after 12 weeks of treatment, while the other molecules like sofosbuvir + ledipasvir and sofosbuvir + ribavirin gave detectable viral loads after 12 weeks of treatment for genotype 2. These results corroborate those of Sakr et al [34] who showed that pan-genotypic molecules were very effective in the treatment of HCV infection with a success rate of 95–100% regardless of the genotype. The detectable viral load after 12 weeks of treatment with genotype 2 could be explained by the fact that these patients had a very high viral load prior to treatment, and sofosbuvir + ledipasvir and sofosbuvir + ribavirin were better indicated for treatment of genotype 1.…”

Section: Discussionsupporting

confidence: 91%

Seroprevalence, Genotyping, and Monitoring of Hepatitis C Viral Loads in Patients on Antivirals in Burkina Faso

et al. 2021

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Introduction: Hepatitis C virus (HCV) infection remains a major public health problem worldwide. In Burkina Faso, nearly 720,000 people are living with HCV, and each year about 900 people die from complications of cirrhosis or hepatocellular carcinoma. This study was planned to determine the HCV seroprevalence, characterize circulating genotypes, and monitor HCV viral loads in patients under treatment with antivirals. Methods: A total of 4,124 individuals and 167 patients in the pre-therapy program were recruited. The “SD Bioline HCV” kit was used for rapid screening of anti-HCV antibodies. Viral load and genotyping were performed in 167 HCV patients on antivirals using the “Iontek HCV Quant” and “Iontek genotyping” kits. Results: Prevalence of HCV was 1.65% (68/4,124), and the median viral load of participants was 5.37 log10/mL (1.32–7.67 log10/mL). Genotype 2 was predominant with a frequency of 86.23% (144/167) and appeared to be more active with higher viral load compared to 13.77% (23/167) for genotype 1 (p < 0.001). After 24 weeks of pan-genotypic direct-acting antivirals, such as sofosbuvir/daclatasvir and sofosbuvir/velpatasvir, the viral loads of all patients became undetectable. Conclusion: The responses to antivirals by the circulating genotypes indicate that the results are very satisfactory. Therefore, the prevalence of HCV in the population can be reduced through identification of cases and treatment.

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Section: Discussionsupporting

confidence: 91%

Seroprevalence, Genotyping, and Monitoring of Hepatitis C Viral Loads in Patients on Antivirals in Burkina Faso

et al. 2021

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“…The SoS concept [140] with a large scaled integration can effectively be used in connection with antenna-on-chip or antenna-insubstrate, depending on processing technologies and guidedwave methods. Within the integration platform, polarization diversity can also be deployed to create a joint operation of multiple polarizations within the guided-wave sections such as the devised and demonstrated polarization-selective coupling technique, integrated orthomode transducer and dualpolarization [141], [142]. The 3D SIW techniques can also be exploited for multi-polarization applications [143].…”

Section: E Integrationmentioning

confidence: 99%

Substrate Integrated Transmission Lines: Review and Applications

2021

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“…β o = β z1 , defined also in (2) and 3for m = 1. In (5), l denotes the length of the coupling section. Equation 5shows that by obtaining the numerical value of the β e and β o , the required coupling length can be easily deduced without the need of empirical equations and optimizations.…”

Section: Hybrids Pec/pmc Couplermentioning

confidence: 99%

“…Many previous research efforts are conducted for implementing forward wave couplers based on different technologies. Some couplers are based on rectangular waveguides (RWG) [2], microstrip lines [3], substrate integrated waveguide (SIW) [4], nonradiative dielectric (NRD) waveguide [5], [6] and ridge gap waveguide (RGW) [7]- [9].…”

Section: Introductionmentioning

confidence: 99%

Analytical Design Procedure for Forward Wave Couplers in RGW Technology Based on Hybrid PEC/PMC Waveguide Model

Beltayib

Sebak

2019

IEEE Access

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In this paper, a systematic design methodology of a 0dB and a 3dB forward couplers based on the ridge gap waveguide (RGW) technology is presented. This methodology is based on exact theoretical formulations rather than any approximate or empirical equations. The procedure of the proposed design methodology is mainly to build a virtual equivalent waveguide model. This waveguide has two horizontal upper and lower perfect electric conductor (PEC) walls, while the left and the right walls are made of perfect magnetic conductors (PMC). A detailed analysis for this hybrid PEC/PMC waveguide, a common waveguide for coupling, is introduced as the starting phase for designing the RGW couplers. The equivalent RGW coupler that assures the same operation of the hybrid PEC/PMC waveguide at a specific frequency range is deduced based on detailed theoretical aspects. Moreover, a simple analyzing of transitional bends and phase shifters with accurate calculations is presented in this paper, which are the fundamental building blocks of several mmW components such as the six-port junction and the butler matrix. The possibility of tuning the coupler center frequency is introduced without the need of using any nonlinear elements. The resulting RGW couplers are implemented through well-known full wave simulator (Ansoft HFSS), with verification through prototype measurements in order to confirm the validity of the proposed methodology. A good agreement is achieved between measurement and simulation results. INDEX TERMS Hybrid forward couplers, periodic structure, ridge gap waveguide, hybrid PEC/PMC waveguide.

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Theory of Polarization-Selective Coupling and Its Application to Design of Planar Orthomode Transducers

Cited by 14 publications

References 32 publications

Seroprevalence, Genotyping, and Monitoring of Hepatitis C Viral Loads in Patients on Antivirals in Burkina Faso

Seroprevalence, Genotyping, and Monitoring of Hepatitis C Viral Loads in Patients on Antivirals in Burkina Faso

Substrate Integrated Transmission Lines: Review and Applications

Analytical Design Procedure for Forward Wave Couplers in RGW Technology Based on Hybrid PEC/PMC Waveguide Model

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