Universal Mobile Telecommunication System UMTS

In the year 2000, at the peak of the dot-com bubble, many governments around the world allocated or sold licenses to offer high-speed wireless (third generation) telephone services. The sales of these UMTS (Universal Mobile Telecommunications System) licenses produced in some of these countries large windfalls for their governments. 

An example for a filter design is given in Reference 58. Because of the considerably low working frequency of the UMTS (Universal Mobile Telecommunication System)-filter (about 2 GHz), a combline topology was chosen to achieve a small filter size. Figure 9.72 shows a drawing of the filter witiiout external grotmd planes. 

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