Journal of Positive School Psychology http://journalppw.com 2022, Vol. 6, No. 3, 4326 – 4332 © 2022 JPPW. All rights reserved Slot Loaded Microstrip Triangular Patch Antenna for dual frequency applications in S band Manik Chandra Borah 1 ,Parimita Saikia 2 , Anup Kr Bordoloi 3* ,Bhairab Sarma 4 1 Research Scholar, University of Science & Technology, Meghalaya, India 2 Research Scholar, University of Science & Technology, Meghalaya, India 3 Assam down town University, Guwahati, Assam, India 4 University of Science & Technology, Meghalaya, India 1 manik.borah1962@gmail.com, 2 parimitasaikia@gmail.com, 3 bordoloianup@gmail.com 4 sarmabhairab@gmail.com *Corresponding author: bordoloianup@gmail.com Abstract Tuning of resonant frequency of microstrip patch antenna is an important aspect for practical applications within the application band. A simple dual frequency triangular patch antenna is designed which can be operated in L and S band. The antenna is initially designed for best performance in terms Return Loss values with optimized feed point location. The basic rectangular patch resonating within the band is further modified to triangular patch with insertion of slots, to investigate the shift in resonating frequency. Purpose of designing slot loaded antenna is to tune the antenna for single and/or dual frequency operation when required for various practical applications. Three triangular slots are inserted vertically across the radiating edge within the patch and one rectangular slit placed vertically 1mm distance from center towards another radiating edge. Keywords— Dual frequency, L,S- band, Slot Loaded, Triangular patch. INTRODUCTION Microstrip patch antenna, highly used for communication purpose can provide wider bandwidth applicable in various frequency bands [2], [3], [7]. On the other hand, tuning resonant frequency of patch within the same band or other is an important design aspect [1], [4], [5] in terms of practical applications [6], [8]. In this report, path antenna has been fabricated on a copper clad FR4 substrate with a dielectric constant of 4.8 (εr) and substrate thickness of 1.5 mm (h). All the antennas designed in the present investigation are fed with coaxial probe feeding and simulations are carried out using CST microwave studio. Maximum Return Loss and VSWR for best matching with relocation of feed point for various structures at different frequencies has been investigated and results are analyzed. In conclusion, the measured results indicate that the antenna resonates at two distinct frequencies, one is at 2.484 GHz and another is at 3.956 GHz with good return loss and the VSWR are within reasonable range, between 1.002 to 1.09. ANTENNA DESIGN A simple rectangular microstrip patch antenna is designed using high frequency simulation software CST Microwave Studio which resonates at L and S- band. Dimension of the simple rectangular patch antenna has been put in Table 1 and Fig 2.shows the geometry of the simple patch. Antenna parameters Values in mm Length of ground plane 48 mm