Abstract
This paper presents the design and implementation of a 60-/110-GHz millimeter-wave CMOS dual-band on-chip bandpass filter. This miniaturized dual-band filter using embedded metamaterial resonators (EMRs) and half wavelength open-loop resonators has been proposed. The EMRs are designed to have both left and right hand modes, which are simultaneously excited by the composite right/lefthanded (CRLH) structure. The half wavelength open-loop resonator is designed to provide another passband. Without using an external dual-band impedance transformer, the proposed structure can provide two transmission passbands. The dual-feed structure is presented to control the external quality factors of the first and second bands. Such an approach leads to a significant reduction for the on-chip area. Also, the frequency selectivity and impedance matching are further improved. Finally, this designed bandpass filter with the core size of 0.351 mm × 0.245 mm has been fabricated on a 0.18-μm standard CMOS process. The insertion losses at the frequencies 60 and 110 GHz are 3.5 and 3.4 dB, respectively. Up to 110 GHz, the EM simulated and measured results of the proposed filter are shown in a good agreement.
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