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All Journal Sinergi Sistema: Jurnal Pendidikan
Haryanto, Puji
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Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Social Sciences Other

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Pengaruh Kepemimpinan Kepala Sekolah Dan Iklim Kerja Terhadap Kinerja Guru SMA Di Kecamatan Samarinda Utara Haryanto, Puji; Subagyo, Lambang; Dwiyono, Yudo
SISTEMA: Jurnal Pendidikan Vol. 2 No. 1 (2021): SISTEMA: Jurnal Pendidikan
Publisher : Teacher Training and Education Faculty, of Widya Gama Mahakam Samarinda University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24903/sjp.v2i1.715

Abstract

This study aims to determine the effect of (1) Principal leadership on teacher performance, (2) the work climate on teacher performance, (3) work climate and principals' leadership together on teacher performance. The research method used is the method of correlation. The research respondents were high school teachers in SMA Negeri 9 Samarinda , SMA Negeri 12 Samarinda , SMA Negeri 13 Samarinda , and SMA Islam Bunga Bangsa Samarinda in North Samarinda Sub-District as many as 106 people . The technique of collecting data uses a structured questionnaire, with three instruments, namely the work climate, principal leadership and teacher performance. The results of the study show (1) there is a positive effect of principals' leadership on teacher performance with a correlation coefficient = 0.078, (2) there is a positive effect of the work climate on teacher performance with a correlation coefficient = 0.206; (3) there is a positive effect of work climate and principal leadership on teacher performance with a correlation coefficient = 0.302 Keywords: work climate, leadership and performance
An ultra-broadband microstrip antenna using a triple dumbbell-shaped defected ground structure Haryanto, Puji; Astuti, Dian Widi; Alaydrus, Mudrik; Firdausi, Ahmad; Rusdiyanto, Dian; A Majid, Huda
SINERGI Vol 30, No 1 (2026)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/sinergi.2026.1.008

Abstract

Microstrip antennas are widely used in modern communication systems due to their compact size and low profile. However, they typically suffer from narrow bandwidth, limiting their performance in advanced wireless applications. This study addresses this limitation by employing a triple dumbbell-shaped defected ground structure (DGS). The antenna is designed to operate at 3.5 GHz using a Rogers RT5880 substrate, and its performance was analyzed through simulations in HFSS 15.0 software. Without the DGS, the antenna exhibits a fractional bandwidth (FBW) of only 1.71%, operating from 3.47 GHz to 3.53 GHz. Incorporating the triple dumbbell-shaped DGS in the ground layer increases the FBW significantly to 53.6%, extending the operating frequency range from 2.39 GHz to 4.14 GHz. This improvement was achieved through the careful optimization of DGS parameters. The simulated gain at 3.5 GHz is 5.13 dBi. The proposed design demonstrates superior performance compared to conventional techniques such as split-ring resonators (SRR) and Butler matrix (BM) configurations. Simulation and measurement results show excellent agreement, validating the design. The achieved ultra-wideband performance benefits 5G and next-generation systems, offering greater frequency tolerance, diverse signal support, increased capacity, and reliable operation, making the antenna a promising candidate for future wireless applications. 
Co-Authors A Majid, Huda Ahmad Firdausi Dian Widi Astuti, Budi Irawan Prima Putra, Dian Widi Astuti, Dwiyono, Yudo Mudrik Alaydrus Rusdiyanto, Dian Subagyo, Lambang