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It has been considered that it is difficult to realize higher frequency devices than 3 GHz by using conventional surface acoustic wave (SAW) substrate. In order to realize a high frequency device, there are some methods such as using a high velocity substrate or shortening a wavelength (lambda) of an interdigital transducer (IDT). However, almost of all conventional SAW substrates have a low velocity...
This paper presents the design of a new compact end-coupled bandpass filter (BPF). This structure is based on coplanar waveguide (CPW) lines and lambda/4 resonators. Both the bandwidth and the matching can be easily controlled by changing the dimensions of the components of the filter. The structure has been implemented for the bands 2.5-7.6 GHz and 1.7-5.2 GHz. The electromagnetic and equivalent-circuit...
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