Asian Journal of Engineering and Technology (ISSN: 2321 – 2462) Volume 04 – Issue 05, October 2016 Asian Online Journals (www.ajouronline.com ) 109 Simulation and Analysis of Edge-Coupled Band Pass Filter for Ku Band Application Muhammad Mostafa Amir Faisal 1,* , Md. Mushfiqur Rahaman 2 and Abdullah Al Israfil 3 1 Lecturer, Department of ETE, International Islamic University Chittagong Chittagong, Bangladesh 2 Student, Department of ETE, International Islamic University Chittagong Chittagong, Bangladesh 3 Student, Department of ETE, International Islamic University Chittagong Chittagong, Bangladesh * Corresponding author’s email: oranta68 [AT] yahoo.com _________________________________________________________________________________ ABSTRACT— In this paper, an edge-coupled microstrip band pass filter using Ansoft designer is proposed. The filter is operated at Satellite downlink frequency for 12.2-12.7 GHz & the filter is designed on Roger RO6006 substrate with dielectric constant of 6.45, with dimension conductor thickness 0.035 mm and substrate height 0.787 mm. The proposed filter is designed at a center frequency of 12.45 GHz. In this paper, third order band pass filter development with the assistance of the Richards-Kuroda Transformation method is used. A comparison with filter designed on stripline technology is also presented. Keywords— microstrip, edge coupled, chebyshev band pass filter, ku band spectrum. _________________________________________________________________________________ 1. INTRODUCTION The Microstrip line it has become the best known and most widely used planar transmission line for RF and Microwave circuits [6]. This popularity and widespread use are due to its planar nature, ease of fabrication using various processes, easy integration with solid-state devices, good heat sinking, and good mechanical support [1]. In this paper, design and simulation of an edge-coupled bandpass filter realized in microstrip technology is presented. Different filter parameters are estimated using analytical formulas, the simulation of a microstrip transmission line models in a circuit simulator is presented [3]-[6]. Fig. 1: (a) Model used for edge-coupled microstrip line band pass filter (b) Electric field and magnetic field lines. In simple terms, Microstrip is the printed circuit version of a wire over a ground plane, and thus it tends to radiate as the spacing between the ground plane and the strip increases [1]. A substrate thickness of a few percent of a wavelength (or less) minimizes radiation without forcing the strip width to be too narrow. Two microstrip lines placed in close proximity and parallel to each other form coupled microstrip lines [5]. Coupled lines support two modes of propagations [2]-[5]. Even mode exists when charges on both lines are of the same sign, odd mode when the sign is opposite. Each of these modes of propagation has different characteristics of transmission line, namely even and odd mode characteristic impedances and , and even and odd mode phase velocities and . Even and odd mode characteristic impedances of microstrip coupled lines depends on the dielectric constant and normalized dimension s, h and w, h , where s is a width of slot of coupled microstrip lines, w is a width of lines and h is a thickness of substrate.