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Fulltext 5G planar branch line coupler design based on the analysis of dielectric constant, loss tangent and quality factor at high frequency

Mohd Shukor NA, Seman N

Sci Rep, 2020 Sep 30;10(1):16115.
PMID: 32999315 DOI: 10.1038/s41598-020-72444-2

This study focuses on the effect of different dielectric properties in the design of 3-dB planar branch line coupler (BLC) using RT5880, RO4350, TMM4 and RT6010, particularly at high frequency of 26 GHz, the fifth generation (5G) operating frequency. The analysis conducted in this study is based on the dielectric constant, loss tangent and quality factor (Q-factor) associated with the dielectric properties of the substrate materials. Accordingly, the substrate that displayed the best performance for high frequency application had the lowest dielectric constant, lowest loss tangent and highest Q-factor (i.e., RT5880), and it was chosen to enhance our proposed 3-dB BLC. This enhanced 3-dB BLC was designed with the inclusion of microstrip-slot stub impedance at each port for bandwidth enhancement, and the proposed prototype had dimensions of 29.9 mm × 19.9 mm. The design and analysis of the proposed 3-dB BLC were accomplished by employing CST Microwave Studio. The performance of scattering parameters and the phase difference of the proposed BLC were then assessed and verified through laboratory measurement.
Mind Matters: A Critical Look at Malaysia's Postnatal Depression Policy for Women's Mental Health

Alimuddin AS, Mohd Shukor NA, Soh SY, Suainbon R, Mahmud AA, Abdul Samad FD, et al.

Womens Health Rep (New Rochelle), 2023;4(1):381-386.
PMID: 37529757 DOI: 10.1089/whr.2023.0027

INTRODUCTION: This policy brief examines the national health and action plans, laws and regulations, public health policies, and clinical practice guidelines in Malaysia on postnatal depression (PND).
METHODS: We examined and included 13 documents for the presence or lack of a statement of intent and/or actions related to caring for women at risk for or experiencing PND.
RESULTS: Although PND is actively researched and included in the clinical practice guidelines, no other policy documents mention PND.
CONCLUSION: General recommendations to address this matter include channeling resources into developing care for PND, increasing advocacy work to reduce stigma, setting up appropriate training pathways for health care providers, and creating more roles and user-friendly modules for local volunteers to deliver mental health interventions.
Fulltext Case report: Effectiveness of brexpiprazole and esketamine/ketamine combination: A novel therapeutic strategy in five cases of treatment-resistant depression

Chan LF, Woon LS, Mohd Shukor NA, Eu CL, Ismail N, Chin SJ, et al.

Front Psychiatry, 2022;13:890099.
PMID: 35966463 DOI: 10.3389/fpsyt.2022.890099

A significant proportion of patients with treatment-resistant depression do not attain functional recovery despite administration of multiple steps of pharmacotherapeutic strategies. This highlights the elusiveness of meeting unmet needs in existing pharmacotherapies for treatment-resistant depression. There is accumulating evidence that antidepressant agents involving the glutamatergic system such as brexpiprazole and esketamine/ketamine have more rapid onset of action and potentially improved effectiveness as an augmentation therapy in treatment-resistant depression. This case series aimed to report five complex cases of unipolar and bipolar treatment-resistant depression where conventional treatment strategies were inadequate in managing high risk suicidal behavior and achieving functional recovery. We discussed further the possible synergistic mechanisms of the novel combination strategy of brexpiprazole and esketamine/ketamine, clinical and patient factors that influenced treatment response, challenges with this combination strategy and implications for future practice and research.

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