access icon free All-resonator based LTCC diplexer using substrate-integrated-waveguides

A compact diplexer is implemented in Low-Temperature-Cofired-Ceramic (LTCC) technology and consists of six coupled substrate-integrated-waveguide (SIW) cavity resonators stacked in two layers. No transmission-line based junction is used. The couplings between the cavities are achieved through both SIW irises and slots placed in metal layers. The diplexer has two third-order filtering channels, centred at 2.7 and 3.3 GHz with 120 MHz bandwidths. The overall size of the diplexer is 27.74 mm (2.3λg at 3 GHz) × 10.4 mm (0.86λg at 3 GHz) × 0.84 mm, achieved by using an LTCC material of a high dielectric constant of 68. Simulations and measurements are in good agreement to demonstrate a compact diplexer based on an all-resonator structure using high dielectric constant LTCC material.

Inspec keywords: multiplexing equipment; cavity resonators; substrate integrated waveguides; ceramics; permittivity

Other keywords: six-coupled SIW cavity resonators; substrate-integrated-waveguides; two-third-order filtering channels; compact diplexer; frequency 2.7 GHz; SIW slots; bandwidth 120 MHz; low-temperature-cofired-ceramic technology; high-dielectric constant LTCC material; all-resonator-based LTCC diplexer; SIW irises; LTCC material; metal layers; frequency 3.3 GHz

Subjects: Switching centres and equipment; Communication switching; Waveguides and microwave transmission lines; Dielectric materials and properties; Ceramics and refractories (engineering materials science); Waveguide and microwave transmission line components

References

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      • 2. Xu, J., Zhang, X.: ‘Compact high-isolation LTCC diplexer using common stub-loaded resonator with controllable frequencies and bandwidths’, Trans. Microw. Theory Tech., 2017, PP, (99), pp. 19, DOI: 10.1109/TMTT.2017.2697855.
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      • 6. Hong, J.-S., Lancaster, M.J.: ‘Microstrip filters for RF/microwave applications’ (John Wiley & Sons Inc., New York, USA, 2001).
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.3029
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