Two compact microwave band pass filters used in Ka band LTCC frequency synthesizer are presented in this paper. The filters are buried in the Ferro-A6 substrate. Modified SIR structure is employed to improve the stop band rejection and minimize the size of the LTCC BPF. The design processes are proposed. The measured results of the BPFs agree well with the simulation.Index Terms -LTCC, Ka band, band pass filter, frequency synthesizer.
This article is dedicated to the research on a Ka-band frequency synthesizer based on low-temperature cofired ceramics (LTCC) technology. This module is composed of an X-band phase locked loop (PLL) frequency synthesizer and a millimeter-wave quadrupler. In this design, all devices and filters which buried in the substrate are in the same Ferro-A6M LTCC board. Measurements show that the Ka-band LTCC frequency synthesizer covers 34.8-35.2 GHz with a minimal step of 40 MHz, low-phase noise (<À83 dBc/Hz @1 kHz), low-spurious level (À62 dBc), fast-hopping time (<15us). The board size is 33 cm 2 . So far as we know, this is the first time to realize a LTCC frequency synthesizer module on a single LTCC board in millimeter wave band.
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