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The development era demands the skills of teachers to meet needs and adjust. This means that the teacher's ability to upgrade is needed. The objectives of this study were (1) to determine the up-skilling that must be done by vocational school teachers with world-standard work era 4.0; and (2) knowing the concrete steps that must be taken by vocational schools teachers in re-skilling the world-standard work era 4.0. The method used in this research is qualitative with a case study approach. The technique of determining participants using purposive sampling. Participants in this study were vocational school teachers, vocational schools service branches, and widyaiswara. Data collection techniques using structured interviews by preparing interview guidelines. Data analysis using Creswell case study data analysis model, namely (1) data management; (2) memoing; (3) exposure; (4) classification; and (5) interpretation. Data analysis in the study was carried out with the assistance of Software Altas. ti version 8. The results of this study are (1) up-skilling of industrial standard vocational school teachers in the era of 4.0 needs to be done with three components, namely (a) develop new skills; (b) time-to-hire; (c) competency assessment. Meanwhile, (2) re-skilling of vocational schools teachers with industrial standard era 4.0 consists of three components, namely (a) intelligent digital tools; (b) create new tasks and occupations; and (c) coaching programs. This implication can be used for widyaiswara in providing training to vocational school teachers.

This research was proposed a circular patch MIMO antenna by using a ring and circular parasitic radiator structure. As a novelty, in order to enhance bandwidth and gain of circular patch MIMO antenna, a conventional circular patch MIMO antenna will be added a ring and a circular parasitic. Therefore, this research was investigated a conventional MIMO antenna (C-MA), ring parasitic MIMO antenna (RP-MA), and circular parasitic MIMO antenna (CP-MA) as Model 1, Model 2, and Model 3, respectively. This MIMO antenna was designed on FR4 microstrip substrate with r= 4.4, thickness h=1.6 mm, and tan = 0.0265. This MIMO antenna has center frequency 2.35 GHz which is a frequency band for LTE application in Indonesia. An Advance Design System (ADS) software was used to determine the antenna parameters. The MIMO antenna C-MA / RP-MA/ CP-MA achieves 2.36GHz/ 2.38GHz/ 2.38 GHz, 70 MHz/ 100 MHz/ 120 MHz, 1.625 dBi/ 4.066 dBi/ 4.117 dBi, 6.414 dBi/ 7.26 dBi/ 7.153 dBi, 33.9 %/ 47.8 %/ 49.70 %, -12.35 dB/ -22.21 dB/ -23.66 dB, and -30.924 dB/ -28.46 dB/ -27.59 dB for center frequency, bandwidth, gain, directivity, efficiency, reflection coefficient, and mutual coupling, respectively. Compared to C-MA (Model1) performances, The result showed that proposed antenna has wider-bandwidth/ higher-gain with 42.8%/ 150.2 %, and 71.4%/ 163.3% for RP-MA (Model 2) and CP-MA (Model 3), respectively. The proposed antenna has size of 50 mm x 130 mm x 23.2 mm. Measured results are in a good agreement with the simulated results.