Analysis and Design of New Active Quasi Circulator and Circulators

Abstract

Abstract-This paper introduces two new type active quasi circulators and three new type active circulators which use the outof-phase power divider/combiner, symmetric/anti-symmetric couplers and generic unilateral amplifiers.The proposed circuits are full-symmetric and composed of conventional microwave devices. Analytical relations for active quasi circulator modules are described. These modules have many variations and can be used for very wide frequency range depending on the type of the employed unilateral amplifier, power divider/combiner and symmetric/anti-symmetric couplers. Based on the proposed configurations, analysis and design of n-port active circulators are presented. Also they can be used in MMICs as active quasi circulators, active circulators and in other high frequency applications.

Continuous SWIFT

“…We obtained high quality images with SWIFT in continuous mode with bandwidths up to 71 kHz. Increasing the bandwidth will require dedicated hardware modifications, including possible construction of a probe with highly decoupled crossed coils, optimizing a connection scheme based on hybrids or active circulators [35], and/or replacing the preamplifier with one having an extended dynamic range. In the meantime, the highly oversampled digital receiver used on the Agilent system greatly exceeds the discretization requirements for cSWIFT.…”

Investigations of Cylindrical Ferrite Coupled Line Junction Using Hybrid Technique

“…the coupling coefficient (22) can be formulated as: (16). Equation (27) indicates that the gyromagnetic coupling occurs when the ferrite is located in the area of line where the magnetic field vectors of two basic isotropic modes are orthogonal.…”

“…In order to obtain the nonreciprocal effects one needs to utilize the ferrite materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] or active elements such as amplifiers [16]. Recently, the longitudinally magnetized ferrite coupled strip- [2, 4-10, 15, 17, 18] or slotlines [14,19] are being developed and employed to realize integrated nonreciprocal devices.…”

“…Nonreciprocal devices have been extensively used in modern microwave and millimeter systems [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. In order to obtain the nonreciprocal effects one needs to utilize the ferrite materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] or active elements such as amplifiers [16].…”

Study of Nonreciprocal Devices Using Three-Strip Ferrite Coupled Line

“…In order to obtain the nonreciprocal effects one needs to utilize the ferrite materials [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] or active elements such as amplifiers [19]. The integrated nonreciprocal devices are in general realized in microstrip [2][3][4][5][6][7][8][9][10][11][12] or slot line [15][16][17][18] technology, with the ferrite material magnetized longitudinally or transversely.…”