High-Power Low-Pass Harmonic Waveguide Filter With ${\rm TE}_{{\rm n}0}$-Mode Suppression

Arregui, I.; Teberio, Fernando; Arnedo, I.; Lujambio, A.; Chudzik, M.; Benito, D.; Jost, R.; Gortz, F.-J.; Lopetegi, T.; Laso, M.A.G.

doi:10.1109/lmwc.2012.2200098

Cited by 22 publications

(16 citation statements)

References 2 publications

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“…In L 2 , h max and h min are set to 8.6 and 1.6 mm to reject the lowest and highest frequency in the fundamental TE 10 ‐mode rejected band ( f min = 13.75 GHz and f max = 38.1 GHz), respectively (the filter width, a 0 , is kept constant, and equal to the WR75 input and output port width, along the z‐ axis). After matching L 2 to the WR75 ports through L 1 and L 3 , all bandstop elements have been replicated in the x ‐direction ( n x = 5) to achieve the rejection of the higher‐order TE n0 modes. The length of the bandstop elements l x and l z are set to the same value:

l_{z} = l_{x} = 3.81 mm

.…”

Section: Demonstration Of the Control On The Higher‐order Mode Supprementioning

confidence: 99%

“…As a width reduction is implemented to achieve the rejection of the higher‐order TE n0 modes, the cutoff frequency of the fundamental TE 10 mode increases, being only possible to design filters with a relatively limited pass band. To design low‐pass filters with a wider pass band, as the classical waffle‐iron devices permit, we proposed in a technique that surpasses the design of waffle‐iron filters allowing broad rejection of the TE 10 mode, higher‐order TE n0 ‐mode suppression, and high‐power handling. However, the suppression of the non‐TE n0 ‐mode was not demonstrated.…”

Section: Introductionmentioning

confidence: 99%

“…However, the suppression of the non‐TE n0 ‐mode was not demonstrated. In this article, the technique of has been completed to fully take into account all modes, including the higher‐order non‐TE n0 ‐modes, in the design of a high‐power low‐pass filter. In our design technique, the suppression of the TE 10 mode is accomplished by means of bandstop elements in the propagation direction, while the TE n0 modes are suppressed by making these elements periodic also in the transversal direction.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tailoring of higher‐order mode suppression in a high‐power alternative to classical waffle‐iron filters

Teberio

Arregui

Arnedo

et al. 2014

Micro & Optical Tech Letters

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In this article, a novel stepwise technique for the design of high‐power low‐pass harmonic filters is proposed. The fundamental and higher‐order mode suppression process is divided into three different steps. In the first step, the fundamental TE10‐mode rejected band is accomplished by adjusting the height of E‐plane bandstop elements along the propagation direction. In the second step, this arrangement of bandstop elements is made two‐dimensional to suppress the higher‐order TEn0 modes. Finally, the higher‐order non‐TEn0 modes are rejected by controlling the minimum mechanical gap of the filter. The design process ends after the first, second, or third step depending on the intended mode behavior for the filter. The main characteristic of the new design technique is that the filter minimum mechanical gap can always be made much larger than in the classical solution (E‐plane corrugated or waffle‐iron filters) for the same frequency specifications. To validate the control of the higher‐order mode suppression that this method permits, three different filters are designed and compared. Moreover, a prototype has been fabricated and its S‐parameters measured to prove the feasibility of the proposed filters for a tailored frequency response. Finally, its high‐power handling capability has been estimated. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2967–2974, 2014

show abstract

l_{z} = l_{x} = 3.81 mm

.…”

Section: Demonstration Of the Control On The Higher‐order Mode Supprementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tailoring of higher‐order mode suppression in a high‐power alternative to classical waffle‐iron filters

Teberio

Arregui

Arnedo

et al. 2014

Micro & Optical Tech Letters

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show abstract

“…In order to enrich the panel of frequency responses that can be satisfied by the synthesized structures, the purely periodic structure of sinusoidal coupling coefficient (6) can be windowed (by making the amplitude a smooth function of [9,15,16]) or chirped (by making the period variable with [10,17]). Finally, if the amplitude is high enough, a transversal resonance can be achieved, providing new degrees of freedom to the designer [11,18].…”

Section: Synthesis Of Quasi-periodic Structures: Windowedmentioning

confidence: 99%

Passive Microwave Component Design Using Inverse Scattering: Theory and Applications

Arnedo

Arregui

Chudzik

et al. 2013

International Journal of Antennas and Propagation

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We briefly review different synthesis techniques for the design of passive microwave components with arbitrary frequency response, developed by our group during the last decade. We provide the theoretical foundations based on inverse scattering and coupledmode theory as well as several applications where the devices designed following those techniques have been successfully tested. The main characteristics of these synthesis methods are as follows. (a) They are direct, because it is not necessary to use lumpedelement circuit models; just the target frequency response is the starting point. (b) They are exact, as there is neither spurious bands nor degradation in the frequency response; hence, there is no bandwidth limitation. (c) They are flexible, because they are valid for any causal, stable, and passive transfer function; only inviolable physical principles must be guaranteed. A myriad of examples has been presented by our group in many different technologies for very relevant applications such as harmonic control of amplifiers, directional coupler with enhanced directivity and coupling, transmission-type dispersive delay lines for phase engineering, compact design of high-power spurious free low-pass waveguide filters for satellite payloads, pulse shapers for advanced UWB radar and communications and for novel breast cancer detection systems, transmission-type Nth-order differentiators for tunable pulse generation, and a robust filter design tool.

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“…A multilayer structure composed of

ε

‐negative materials sandwiched by double‐positive layers is presented in but this structure is complex to fabricate. In , a new technique is proposed for the design of a compact high power low‐pass rectangular waveguide which decrease the filter length compare to the alternative previous techniques. But this method is not useful for very high frequency (VHF) band frequency because it is not compact anymore.…”

Section: Introductionmentioning

confidence: 99%

Design and implementation of a practical semi-lumped high power low-pass filter

Pourgholamhossein

Askari

Hedayati

et al. 2014

Int J RF and Microwave Comp Aid Eng

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In this article, a compact, semi-lumped and high power low-pass filter in VHF band frequency is designed, fabricated, and measured. A semi-lumped structure is used to decrease the size of the filter and improve its power handling. In high power analysis, all effects of critical points in distributed and lumped structures are considered. The experimental measurements show close agreement with the simulation results. This filter has a cut off frequency at 180 MHz, 0.02 dB ripples in pass band, return loss better than 21 dB in the pass band, 0.2 dB insertion losses, 1.6 dB/MHz shape factor, a 75% miniaturization against conventional structures with distributed elements, and wide out of band rejection. Moreover, 10 and 1 KW are the peak power and the average power handling of the filter. V C 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:605-614, 2014.

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High-Power Low-Pass Harmonic Waveguide Filter With ${\rm TE}_{{\rm n}0}$-Mode Suppression

Cited by 22 publications

References 2 publications

Tailoring of higher‐order mode suppression in a high‐power alternative to classical waffle‐iron filters

Tailoring of higher‐order mode suppression in a high‐power alternative to classical waffle‐iron filters

Passive Microwave Component Design Using Inverse Scattering: Theory and Applications

Design and implementation of a practical semi-lumped high power low-pass filter

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