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Design and Simulation of X Band Microstrip Circulator | IEEE Confere Design and simulation of X Band microstrip circulator | IEEE Confere... https://ieeexplore.ieee.org/document/7848365 IEEE.org IEEE Xplore IEEE-SA IEEE Spectrum More Sites Cart Create Account Personal Sign In Access provided by: Sign Out Browse My Settings Help Institute of Technology (Nirma University) Access provided by: Sign Out Institute of Technology (Nirma University) All Conferences > 2016 IEEE Region 10 Conferenc... Design and simulation of X Band microstrip circulator Publisher: IEEE Cite This PDF Vishwa Kelaiya ; Mehul R. Naik All Authors 2 961 Paper Full Citations Text Views Abstract Abstract:Microwave circulator is an important ferrite device which is widely used in wireless transceivers. This paper presents design and simulation of X-Band microstrip Document Sections circulat... View more I. Introduction Metadata Abstract: II. Design Theory Microwave circulator is an important ferrite device which is widely used in wireless III. Simulation and transceivers. This paper presents design and simulation of X-Band microstrip circulator. Results Major application of microstrip junction circulator presented here is as duplexer in RADAR. The circulator designed here is centered at 9.6 GHz with 800 MHz bandwidth. IV. Matching CST Microwave Studio Suite is used as simulation software. Here, the design equations V. Conclusion and given by Fay and Comstock are followed and prototype of X-band microstrip circulator is Future Scope prepared. Yttrium iron garnet (YIG) is used as ferrite material. Isolation and return loss of more than 20 dB, and insertion loss of less than 0.1 dB are achieved in simulation Authors results. Figures Published in: 2016 IEEE Region 10 Conference (TENCON) References Date of Conference: 22-25 Nov. 2016 INSPEC Accession Number: 16667532 Citations Date Added to IEEE Xplore: 09 February DOI: 10.1109/TENCON.2016.7848365 2017 Keywords Publisher: IEEE ISBN Information: Conference Location: Singapore Metrics Electronic ISSN: 2159-3450 More Like This Contents SECTION I. Introduction Many approaches are found for designing of circulator-with stripline and waveguide transmission medium [1] [2]. One uses green function and scattering matrix analysis for three port stripline circulator [3]. Others 1 of 9 26-05-2021, 11:33 Design and Simulation of X Band Microstrip Circulator Vishwa Kelaiya, Mehul R. Naik Nirma University, Ahmedabad, India [email protected], [email protected] Abstract—Microwave circulator is an important ferrite device device is to be operated over wider temperature range. which is widely used in wireless transceivers. This paper presents Magnetization temperate coefficient refers to the deviation of design and simulation of X-Band microstrip circulator. Major magnetization with respect to temperature. Based on these application of microstrip junction circulator presented here is as tradeoffs and properties of various ferrite materials as per table duplexer in RADAR. The circulator designed here is centered at 9.6 II, we selected yttrium iron garnet Y220 as the ferrite material. GHz with 800 MHz bandwidth. CST Microwave Studio Suite is Here resonance linewidth of Y220 is lowest and saturation used as simulation software. Here, the design equations given by magnetization is highest. Though temperature stability of Y220 Fay and Comstock are followed and prototype of X-band microstrip is slightly lesser than other materials, here low insertion loss is circulator is prepared. Yttrium iron garnet (YIG) is used as ferrite material. Isolation and return loss of more than 20 dB, and more important; so Y220 is chosen among available ferrites. insertion loss of less than 0.1 dB are achieved in simulation results. Dependence of circulator parameters on other ferrite properties is given in detail in [6]. I. INTRODUCTION Table II. Properties of different ferrites Many approaches are found for designing of circulator - with Ferrite Saturation Resonance Curie Temp. stripline and waveguide transmission medium [1] [2]. One uses Type Magnetization linewidth Temp. stability ିଷ green function and scattering matrix analysis for three port 4ʌMs (G) ǻH (Oe) Tc ሺιC) ߙ (ͳͲ ȀԨ) stripline circulator [3]. Others have given phenomenological Y4091 960 35 195 1.4 Y220 1950 10 205 3.1 description in terms of rotating modes [4] and analysis of Y78 800 80 220 1.3 stripline with new set of equations [5]. In this paper prototype of Y34 1030 40 210 2.7 X-band microstrip circulator is prepared using the software CST Microwave Studio with actual magnetic circuit. Design Material properties of yttrium iron garnet Y220 is given in equations as in [2] are followed and optimization is achieved using CST. Table III. Table III. Properties of Ferrite Material Y220 ESIGN THEORY II. D Saturation Magnetization(4ʌMs) 1950 G Curie Temperature(Tc) 205°C A. Selection of ferrite Resonance line width(ǻH) 10 Oe Effective linewidth(ǻHeff) 2 Oe The specifications of the X band circulator are given in Spin wave linewidth(ǻHk) 1 Oe table I: Dielectric Constant 15.4 -3 Magnetization Temperature coefficient (ߙ) 3.1 x 10 /Ԩ Table I. Specification of X band circulator Center Frequency 9.6 GHz B. Determination of ferrite radius Bandwidth 800 MHz Ferrite radius is determined from the equations given in [2]. Insertion loss < 0.4 dB The solutions of the electromagnetic field equations involve the Isolation > 20 dB th Return loss > 20 dB Bessel function of the N order. For most practical circulators, N =1 and for resonance we have, ᇱ Selection of ferrite material affects frequency of the ܬଵሺܴሻ ൌͲ (1) operation, bandwidth, RF power level and insertion loss [2]. The important properties of the ferrite material which should be Where ܬis the Bessel function, ݇ is the wave number and ܴ is the ferrite radius. Evaluating (1) we get, considered are saturation magnetization, resonance linewidth, and magnetization temperature coefficient. High saturation ܴ݇ ൌ ͳǤͺͶ (2) magnetization results in wider bandwidth, but it also lowers From (1) and (2), we found that the initial radius of ferrite power handling capability; so there always is a tradeoff between R = 2.1 mm. bandwidth and power handling capability. Here, we are more concerned with bandwidth, so the saturation magnetization requirement will be high. Insertion loss will depend on resonance C. Region of operation linewidth of ferrite material. To lower the insertion loss, we After obtaining ferrite radius, electrical design of microstrip should choose the ferrite whose linewidth is minimum. circulator is prepared as shown in Fig. 1. The circulator designed Temperature stability of ferrite material is considered when the here operates in below resonance region. In the below resonance 978-1-5090-2597-8/16/$31.00 c 2016 IEEE 1961.
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