List of Articles circular Open Access Article Abstract Page Full-Text 1 - Circular Symmetric Coupled Microstrip Lines Mohammad Khalaj-Amirhosseini Open Access Article Abstract Page Full-Text 2 - Optimum Design and Fabrication of Pen-Shaped Antenna Mohammad Khalaj-Amirhosseini Open Access Article Abstract Page Full-Text 3 - Design and Implementation of a Circularly Polarized Microstrip Patch Antenna for GPS Application with Input VSWR Tuning Capability A. A. Heidari Open Access Article Abstract Page Full-Text 4 - Design and Application of Parallel Four-Leg Inverters Sharing Nonlinear and Unbalance Loads M. Hosseinpour M. Mohamadian A. Yazdian Varjani Open Access Article Abstract Page Full-Text 5 - Presenting a circular economy business model for knowledge-based companies Fatemeh Shahdkar taghi torabi Fereydoon Rahnama Roodposhti 10.61186/jstpi.37987.19.75.33 Open Access Article Abstract Page Full-Text 6 - External Skeletal Fixators in Small Animal hamid reza moslemi navid Ehsani pour Faeze Emarloo Open Access Article Abstract Page Full-Text 7 - Necessity of Innovative Understanding of Co-creation and The Simultaneous Flourishing of University and Civilization Seyed Ataollah Sinaee