Tunable bandpass filter based on partially magnetized ferrite LTCC with embedded windings for SoP applications

Eyad A. Arabi, Farhan A. Ghaffar, Atif Shamim

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Tunable filters that are based on ferrite materials often require large and bulky electromagnets. In this work, we present a tunable filter in the Ku-band, which is realized in multilayer ferrite LTCC substrate with embedded bias windings, thus negating the need of a large electromagnet. Also, because of the embedded windings, the bias fields are not lost at the air-substrate interface and therefore the field and current requirements are reduced by an order of magnitude as compared to the previously reported filters. A simulation strategy that uses full permeability tensor with arbitrarily directed magnetic fields has been used to model the filter on a partially magnetized ferrite substrate. Special attention has also been paid to approximate the non-uniform magneto-static fields produced by the embedded windings. The complete design is implemented in 10 layers of ferrite LTCC, making it the first magnetically tunable filter with embedded windings and extremely small size [(5 × 5 × 1.1)mm3]. The filter demonstrates a measured tunability of 4% and an insertion loss of 2.3 dB. With the small form factor, embedded windings, and low bias requirements, the design is highly suitable for compact and tunable SoP applications.
Original languageEnglish (US)
Pages (from-to)16-18
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number1
StatePublished - Jan 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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