PERANCANGAN DAN REALISASI ANTENA MIMO 4X4 MIKROSTRIP PATCH PERSEGI PANJANG 5,2 GHZ UNTUK WIFI 802.11N

Meningkatnya kebutuhan transfer data cepat dan dalam jumlah yang banyak pada pengguna Wifi mendorong munculnya teknologi dan standar baru. IEEE telah merilis standar 802.11n, dengan perubahan dari standar sebelumnya adalah datarate lebih tinggi, bandwidth lebih lebar dan mendukung teknologi MIMO. Tantangan dari penggunaan teknik MIMO ini pada terminal pengguna adalah bagaimana mendesain multiple antena yang antarantenanya memiliki nilai mutual coupling kecil namun tidak membuat dimensi antena keseluruhan menjadi terlalu besar. Tugas Akhir ini membahas perancangan antena mikrostrip 4x4 MIMO untuk Wifi yang bekerja di frekuensi 5,180-5,220 GHz, bandwidth 40 MHz, gain ? 2,5 dBi, dan mutual coupling ? -20dB. Port antena diletakkan saling bersudut 900 untuk memperkecil mutual coupling dan mereduksi dimensi antena keseluruhan. Simulasi menggunakan software CST Studio Suite 2014. Antena yang direalisasikan memiliki dimensi 49,475 mm x 49,475 mm, dapat bekerja pada frekuensi 5,180-5,220 GHz. Keempat antena memiliki VSWR ? 1,5 dan mutual coupling ? -20 dB. Bandwidth antena 1 hingga 4 berturut-turut 92 MHz, 96 MHz, 63 MHz, dan 83 MHz. Gain yang dihasilkan antena 1 hingga 4 berturut-turut 3,306 dBi, 3,428 dBi, 3,38 dBi, dan 3,315 dBi. Pola radiasi yang dihasilkan unidirectional dengan polarisasi elips. Kata kunci : antena MIMO, Wifi, rectangular pact

The Efficacy of Preoperative Tamsulosin on Ureteroscopy Access in Pediatrics: A Systematic Review and Meta-Analysis

Objective: The incidence of urolithiasis in pediatrics increases to 4-10% annually. One of the methods for treating urolithiasis is ureteroscopy (URS). The small anatomy in pediatrics often makes the initial URS unsuccessful. Alpha blockers, a drug that can relax the ureteral muscles, is a therapy that can be considered before URS is carried out. The objective of this study is to evaluate the efficacy of preoperative  tamsulosin  for URS access in pediatrics. Materials and Methods: We conducted a search using four databases, including PubMed, EBSCO, Cochrane Library, and ProQuest. This study includes randomized controlled trials (RCTs), retrospective and prospective studies, which compared the efficacy of preoperative alpha blockers and placebo or non-placebo controls in pediatrics undergoing ureteroscopy. The outcome of interest was the success rate of URS access and the duration of surgery. Results: A total of 120 studies were identified from a database search. There were 3 studies included in this review involving 235 patients. The meta-analysis was conducted using a random-effects model. The results of the meta-analysis showed that alpha blockers provided a successful rate of ureteroscopy access in pediatric patients (Odds ratio (OR) 2.73; 95% confidence interval (CI) 1.52 up to 4.91; p=0.0008). Duration of surgery did not show significant results (Mean difference (MD) 3.46; 95% CI -3.59 up to 10.50; p=0.34)

Efficacy of Pregabalin, Solifenacin, or Combination Therapy for Ureteral Stent Related Symptoms: A Systematic Review and Meta-Analysis

Objective: The Double-J (DJ) ureteral stent is essential in urology but can lead to Ureteral Stent-Related Symptoms (USRS), prompting research into various therapies to enhance patient comfort. The purpose of this study is to assess the efficacy of pregabalin, solifenacin, or combined therapy on ureteral stent-related symptoms. Materials and Methods: We conducted thorough searches in four databases, which included PubMed, Cochrane, EBSCO, and ProQuest. PRISMA Guideline 2020 was applied in this study. The risk of bias was assessed using Newcastle-Ottawa Scale and Cochrane Risk of Bias 2.0. Results: Ten studies consisting of 1477 participants were included in this study. Solifenacin monotherapy could significantly decrease total USSQ (mean difference (MD) -16.62; p=0.001), urinary symptoms (MD -9.16; p=0.002), and sexual matters (MD -0.81; p=0.002). Pregabalin monotherapy could significantly decrease pain (MD -7.29; p<0.00001). Compared to solifenacin monotherapy, combination therapy of pregabalin and solifenacin could significantly decrease total USSQ (MD -12.40; p <0.0001), urinary symptoms (MD -1.88; p=0.007), pain (MD -6.82; p<0.00001), sexual matters (MD -0.77; p <0.00001), and additional problems (MD -1.51; p=0.0007). Conclusion: Combination therapy of pregabalin and solifenacin had the best advantages in lowering USRS, especially urinary symptoms, pain, sexual matters, and some other additional problems