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CPW circulator is highly compatible with microwave integrated circuits. CPW circulator, however, has an inherent drawback in that the ground conductors are inevitably disconnected by the Y -shaped configuration of the junction. Therefore, the operation characteristics of the CPW circulator have been inferior to those of other circulators. In this paper, a three-legged top plate conductor covering over the ferrite disk like an air bridge is proposed to improve the operation characteristics. With this scheme the ground conductors are tightly connected with one another, and the ferrite disk can be better coupled with the magnetic field outside. The CPW circulators with the top plate were manufactured and their performances measured. As a result, we obtained an isolation ratio of more than 20dB, an insertion loss of less than IdB, and a bandwidth of greater than 250MHz each at llGHz, performances that compare favorably with those of conventional CPW circulators. I . INTRODUCTION 1Il that the ground conductors are inevitably disconnected by the Y-shaped configuration of the A circulator is a representative mi<:rowave device junction. This might be a reason why the operation in which the anisotropic property of ferrite is made characteristics of the CPW circulator have been use of to achieve nonreciprocal behavior. This paper inferior to those of other circulators. In this paper, a reports on a novel circuit design by which the three-legged top plate conductor covering over the operating bandwidth of a coplanar waveguide ferrite disk like an air bridge is proposed to improve (CPW) junction circulator can be effectively the operation characteristics. widened. There have been many papers on circulators using strip line, microstrip line, or rectangular waveguide, but few papers have been reported on CPW circulators except one by Ogasawara[l] and one by authors [2]. The CPW circulator has several advantages as compared with those using strip line or microstrip line as the basic transmission line. One is that, with a CPW circulator, the circulation operation can be achieved by mounting a ferrite disk on only one surface of the dielectric substrate. Another advantage is that the ferrite disk can easily be mounted on the center conductor of the junction without drilling a hole through the substrate. Besides, the CPW circulator is highly compatible with microwave integrated circuits. The CPW circulator, however, has an inherent drawback IT . STRUCTURE OF THE CPW CIRCULATOR Figures 1 and 2 show the top view and the crosssectional view of the CPW circulator, respectively. Both the inner and outer conductors of the CPW are formed on one surface of the dielectric substrate, and there are no conductors on the other surface. A ferrite disk is mounted on the Y junction of the inner conductor for circulation operation. For improvement in the operation characteristics, a three-legged top plate conductor is placed over the ferrite disk like an air bridge, and the three legs of the top plate are connected to the outer conductors as shown in Fig. 2. With the present technique of substrate manufacturing, it will not be very difficult to place a three-legged top plate over the ferrite

Improvement in the Operating Bandwidth of Coplanar Waveguide Circulator