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CPW bandpass filters employing end-coupled half-wavelength resonators or dual-mode ring resonators on alumina substrates are investigated. One filter employs three half-wavelength resonators with a combination of both edge and end coupling, and has a centre frequency of 23 GHz with a 1 GHz bandwidth and a measured insertion loss of 3.5 dB. The second filter is a CPW square dual-mode ring resonator...
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