Abstract
The main idea of this paper is to find an analytical formula for the input conductance of an elevated ferrite film circu-lator to match it systematically to the desired matching network. For solving the ferrite loaded dielectric resonator included in stripline elevated ferrite film circulator, the off diagonal components of the permeability tensor are taken as the perturbation. The electromagnetic fields computations are done for unperturbed structure. The dipolar resonant frequencies corresponding to harmonics of the resonant modes are then calculated using the perturbation integrals. The quality factor of the circulator is derived in terms of these dipolar resonant frequencies. Energy integrals are calculated to find the energy stored in the ferrite and dielectic layers. An analytical expression for the input conductance of the elevated ferrite film circulators is derived by using the quality factor and energy integrals. In this expression the ferrite and dielectric layers can have different permittivities. Some discussions about the effect of ferrite film thickness and permittivity mismatch on the bandwidth of the circulator are investigated by HFSS commercial software.
Highlights
Y-junction ferrite circulators are important devices in today microwave circuits and have been studied in literature in recent years [1,2,3,4,5]
The main idea of this paper is to find an analytical formula for the input conductance of an elevated ferrite film circulator to match it systematically to the desired matching network
An analytical expression for the input conductance of the elevated ferrite film circulators is derived by using the quality factor and energy integrals
Summary
Y-junction ferrite circulators are important devices in today microwave circuits and have been studied in literature in recent years [1,2,3,4,5]. This significance is initiated and spread out from the directional properties of ferrimagnetic devices allowing the control of microwave signals through a bias magnetic field [6]. The other applications of Y-junction ferrite circulators can be in transmit receive functions where a shared antenna is required to be used for both transmission and reception of the signal [8]
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