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Ellipticalirisesin rectangular waveguides are currently finding application in dual mode filters, couplers, etc. They present ease of manufacture and, with respect to rectangular irises, improved sensitivities. In this contribution we introduce new analytical formulae for the modal evaluation of the scattering properties of a set of thick elliptica...
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Context 1
... opr iate choice ofthe coor dinate s ys tem s , aswel las by a s uitabl e us e ofthe G r een' stheor em .R efer r ing to Fig. 2, the following result is recovered for the coupling between a T E (1) `;n mode in the rectangular waveguide and a T E (2) d;v mode in elliptical ...
Context 2
... we express the rectangular waveguide poten- tials in terms of the coordinate system attached to the elliptical waveguide (x 2 ; y 2 ) of Fig. 2. For T E modes, referring to the position vector r 2 ´ (x 2 ; y 2 ) in the coordinate system 2, we ...
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Citations
... It is highly desirable to generate such a multi-pole response without increasing both transversal and longitudinal dimensions of the filter. A way to achieve this goal was proposed in [3][4][5]. It was shown that cutting an additional slot in a classic resonant diaphragm allowed to generate an attenuation pole in its response. ...
A novel three-in-one waveguide resonator is proposed in the paper. The resonator is composed of three rectangular partial-height posts inserted along a rectangular waveguide cross-section. A pair of posts is mounted symmetrically whereas the third antipodal post is centered. The resonator provides a bandstop response if all the posts are of equal height. Both singlet-type and pseudoelliptic characteristics are achieved if one of the posts differs by its height. Both symmetric and asymmetric configurations are considered. Besides, it is demonstrated that the asymmetric resonator acts as a switching waveguide filter providing the ON and the OFF states to allow/block the signal propagation in a narrow vicinity of a given frequency. A parametric numerical study is performed in order to demonstrate a transformation of the response Measurement data are presented for a single-standing resonator and a two-section pseudoelliptic filter in WR90 waveguide.
A novel design of band-stop and band-pass filters is introduced. These filters are based on stepped conductors or stepped slots in iris which play a role of the filter sections. The step on straight wall-to-wall conductor (vertical or horizontal) provides a rejection resonance and the step on wall-to-wall slot provides a transmission resonance within the single-mode band of a rectangular waveguide.
The simple configurations of realistic rejection units placed in a rectangular waveguide are suggested. They are thin stepped conductors connecting the opposite waveguide walls and forming a kind of thin two-aperture irises easily placed, for example, between waveguide flanges. A rejection phenomenon is based on the interference of the eigenoscillation fields of the iris with two L-shaped apertures. The rejection frequency and quality factor are controlled over a wide range by the placement and the height of the conductor step. The situation when a stepped perfect conductor provides the resonance of a nearly zero bandwidth is revealed. In other words, such a nontrivial 3D waveguide unit loaded with above-cutoff waveguides is able to support an eigen oscillation without any radiation loss. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 416–420, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24892
In this paper, a new notch and bandstop filters are proposed and investigated. A rejection section, based on a thin slotted H-plane strip, provides a symmetric frequency response with very low insertion loss out of the stopband. The rejection phenomenon is explained by the simultaneous excitation of two eigenoscillations with low and high Q-factors. The results of numerical design and measurement data are given for a 3% notch filter and a 2% three-section bandstop one. Such a notch filter is probably the simplest one due to its easy fabrication and has the potential to be incorporated in a waveguide circuit by placing it between the waveguide flanges. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 20–24, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20889
The problem of the TE11-mode scattering by a multiaperture iris in a circular waveguide is considered. Depending on the iris layout, it can lead to a transmission, rejection, or hybrid response. A narrowband filter section providing transmission of the incident modes of both linear polarizations with reduced field strength at a common frequency or at different frequencies is proposed. Simple multislot irises providing narrowband reflection are proposed as the elements of rejection filters or as the tool to introduce additional attenuation poles to the bandpass filters. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1472–1476, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21734
New configuration of the notch and bandstop filters is proposed and investigated. Here a rejection section is based on a thin slotted H-plane strip that may be considered as a limiting case of a three-slot iris. Such a section forms symmetrical frequency response with very low insertion loss out of the stopband. The results of numerical design and measurement data are given for a 3% notch filter and for 2% three-section bandstop one. In the low-power applications the proposed notch filter is probably the simplest one due to its easy fabrication and a possibility to be incorporated into a waveguide circuit by placing between the waveguide flanges.
A new bandpass circular waveguide filter that provides TE<sub>11</sub>-mode transmission is presented. The structure is composed by the cascade connection of multi-slot irises. Each multi-slot iris contains a pair of arc-shaped slots and one rectangular slot located between them. Such a filter provides transmitting both linearly polarized TE<sub>11</sub>-modes at the desired frequency depending on the dimensions of the slots.
The total reflection resonances that take place at the excitation of perforated screen with two apertures over the period are discussed. A pair of apertures with different dimensions provide the existence of rejection point at the frequency response. If appropriate dimensions of the slots are chosen, such a simple grid provides the rejection resonance of the required quality-factor and frequency. Numerical results concerning frequency and angle responses of two-aperture perforated screen are presented. Strict parallel between the rejection resonances in two-aperture screens and rejection waveguide irises is confirmed.
