Bandpass filters help sort the many different frequency bands used in modern communications systems. With the growth of portable electronic communications devices, miniaturization of these filters takes on greater importance. On that front, designers leveraged an Archimedes spiral capacitor and ground-loaded elliptical ring stubs to develop a compact dual-band bandpass filter (BPF). The filter, with passbands of 0.77 to 1.07 GHz and 1.65 to 2.02 GHz, is well-suited for GSM/DCS wireless
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