Broadband substrate integrated waveguide edge‐guided mode isolator

Fesharaki, Faezeh; Akyel, C.; Wu, Ke

doi:10.1049/el.2012.2700

Cited by 23 publications

(14 citation statements)

References 16 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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“…The continuity of fields at the boundary between region1 and region2 leads to (4) In (1) (4), , and are constants, is the SIW equivalent width, and are the relative dielectric constants and relative magnetic permeability of the substrate, is the relative dielectric constants of the ferrite, and is the effective relative permeability, which can be written as (5) In (5), and are the permeability tensor elements of the ferrite material, which are related with external bias, saturation magnetization value and the operating frequency.…”

Section: A Siw Switch With a Single Ferrite Slabmentioning

confidence: 99%

“…In recent years, many ferrite-loaded components were developed based on SIW, such as switch [2], tunable filter [3], isolator [4], [5], reconfigurable antennas [3], [6], oscillator [7], etc.…”

Section: Introductionmentioning

confidence: 99%

Surface-Loaded Ferrite Substrate Integrated Waveguide Switch

Huang

Cheng

2015

IEEE Microw. Wireless Compon. Lett.

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In this letter, a magnetically controlled surface-loaded ferrite single pole single through (SPST) switch is presented. The ferrite slab is loaded on the broad wall surface of a substrate integrated waveguide (SIW). When a dc magnetic bias is applied to the ferrite slabs, the effective permeability of the ferrite becomes negative. In this case, the wave will be cut off. After investigating the design principle, an X-band switch prototype is fabricated and measured. Its insertion loss is less than 1.6 dB, return loss is better than 15 dB, and isolation is better than 27 dB in a frequency range from 9.5 to 11 GHz.Index Terms-Substrate integrated waveguide (SIW), surfaceloaded ferrite, switch.

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“…Various isolator designs based on bulk ferrite materials have been reported in literature. These designs operate on the principle of resonance absorption (negative permeability) [2], Faraday rotation [3] and field absorption [4]. Most of these designs are based on waveguides due to their superior RF performance in terms of loss and power handling capability.…”

Section: Introductionmentioning

confidence: 99%

A half mode inkjet printed tunable ferrite isolator

Ghaffar

Vaseem

Bray

et al. 2017

2017 IEEE MTT-S International Microwave Symposium (IMS)

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-A novel half mode waveguide based ferrite isolator design is presented in this work. For the first time, tunability of the isolation band is demonstrated for a ferrite isolator. Instead of using the conventional antisymmetric bias the isolator requires a single direction of the magnetic bias field due to the half mode operation. Yttrium Iron Garnet (YIG) is used as the substrate for the device. The metallic walls of the waveguide are realized using inkjet printing. The magnetic biasing applied to the waveguide causes the RF waves to experience negative permeability in one direction of propagation hence providing isolation for this direction. For an applied bias of 3000 Oe, the device provides a maximum isolation figure of merit of 76.7 dB at 7.5 GHz. The isolation band can be controlled by changing the applied magnetostatic bias. As the bias is varied from 1500 Oe to 3500 Oe the center frequency of the isolation band varies from 4.45 GHz to 9 GHz. The measured response of the isolator shows that it can be integrated in any RF system requiring lower cost and good isolation.Index Terms-isolator, ferrite, waveguide, isolator figure of merit (IFM)

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Broadband substrate integrated waveguide edge‐guided mode isolator

Cited by 23 publications

References 16 publications

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

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

Surface-Loaded Ferrite Substrate Integrated Waveguide Switch

A half mode inkjet printed tunable ferrite isolator

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