Ferrite-Loaded Substrate Integrated Waveguide Switch

Ghiotto, Anthony; Adhikari, Sulav; Wu, Ke

doi:10.1109/lmwc.2012.2183859

Cited by 29 publications

(11 citation statements)

References 5 publications

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“…Also, several works have reported combining SIW and bulk microwave ferrite materials, which are cut into slabs and inserted into a nonmagnetic substrate, as depicted in Fig. 1(b) to realize isolators [10], switches [11], circulators [12], and phase shifters [13]. However, this approach suffers from two main drawbacks, which are: 1) the requirement for substrate machining that complicates the fabrication process and 2) the use of bulky coil systems, needed to generate the biasing magnetic field for the ferrite material, which limit the device mobility.…”

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confidence: 99%

An Integrable SIW Phase Shifter in a Partially Magnetized Ferrite LTCC Package

Nafe

Shamim

2015

IEEE Trans. Microwave Theory Techn.

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There is a growing need for small size integrable phased antenna arrays for emerging satellite communications on-the-move applications. Traditional ferrite-based phase shifters are generally bulky due to the need of electromagnets for biasing, yielding them unsuitable for this kind of application. In this paper, a novel compact light-weight substrate integrated waveguide (SIW) based phase shifter realized in a multi-layer ferrite low-temperature co-fired ceramic package with embedded bias windings is reported. By using embedded windings and operating the material in a partially magnetized state, the required bias magnetic field could be significantly reduced from typically about 1000 Oe to less than 50 Oe. Moreover, the presented phase shifter has two modes of operations corresponding to two different biasing scenarios of the SIW, namely, symmetric and anti-symmetric bias. Under anti-symmetric bias, the phase shifter can achieve high nonreciprocal phase shift, whereas under symmetric bias, the phase shift is reciprocal, but the available phase shift is less than the anti-symmetric case. The fabricated prototype operates in the 11.5-13.5-GHz range and has a peak figure of merit (phase shift per decibel of loss) of 102 dB and a maximum phase shift per unit length of 153 cm, which are more than five times the previously reported figures for this technology. Due to the use of embedded windings, the presented phase shifter offers a huge size reduction from the order of cm to mm , making it particularly useful for mobile phased-array applications.Index Terms-Ferrite phase shifter, low-temperature co-fired ceramic (LTCC), substrate integrated waveguide (SIW).

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confidence: 99%

An Integrable SIW Phase Shifter in a Partially Magnetized Ferrite LTCC Package

Nafe

Shamim

2015

IEEE Trans. Microwave Theory Techn.

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“…Switches loaded by a ferrite were described in References 13 and 14. In Reference , a ferrite pad was placed on the top of the SIW creating a partially filled waveguide.…”

Section: Introductionmentioning

confidence: 99%

“…When a magnetic bias was applied, the effective permeability of the ferrite became negative, and the wave was cut off. In Reference , the ferrite was placed inside the SIW close to sidewalls. If the ferrite material was excited by the magnetic bias, the cutoff frequency of the ferrite was changed which made the SIW switchable.…”

Section: Introductionmentioning

confidence: 99%

Textile‐integrated waveguide switch for ISM band 5.8 GHz

Cupal

Raida

2020

Micro & Optical Tech Letters

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In this article, a textile‐integrated waveguide (TIW) switch designed for the ISM band 5.8 GHz is presented. Conductive surfaces of the switch are manufactured by screen printing using a silver paste, and side walls of the TIW are sewed by a conductive thread. The switch is based on a common TIW T‐divider which is completed by controllable conductive posts in both branches. The controllable posts can be switched from the high‐impedance state to the low impedance state (and vice versa) by connecting or disconnecting them to the conductive layers by PIN diodes. Transmissions of the open branch of the switch and the closed one are |S21| = −1.5 dB and |S31| = −14.9 dB, respectively. If the manufactured switch is completed by transitions from TIW to coaxial line, the transitions of the open branch and the closed one are|S21| = −6.2 dB and |S31| = −15.6 dB, respectively.

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“…The brittle ceramic nature of ferrite substrates makes the realization of via rows without substrate fracture a real challenge. To circumvent the problem, researchers in [13], [14] used ferrite slabs to load a SIW that is implemented in a conventional duroid substrate. Although this approach might be acceptable if few devices are needed, it is not feasible for implementing medium and large phased antenna arrays due the need for extensive machining for each device.…”

Section: Introductionmentioning

confidence: 99%