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A novel bandstop waveguide filter, using split ring resonators, is proposed. Split ring resonators are implemented as printed-circuit inserts in a form of reduced dielectric plates, providing better performance in terms of return loss beyond the stop band, compared with the structure where dielectric plates across the entire transverse cross-sectio...
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Context 1
... 3D EM model of the filter using novel SRRs is depicted in Fig. 8. For the WIPL-D model (Fig. 9), dielectric plates are moved up for s u = 2.85 mm related to central position and the parameters of the resonators (Table 2) are tuned in order to obtain required resonant frequency of 9 GHz. Each plate is of the same size (7 mm × 4 mm). ...Context 2
... to this, the distance between the SRRs for different resonant frequencies is (λ g 9GHz -λ g 11GHz )/4 = 3.677 mm. Next, it is important to emphasize that the dimensions of the SRRs are the same as for the described filters and are given in Tables 2 and 4. Related to the central position in the transverse planes, the SRRs for f 01 = 9 GHz are moved up for s u = 2.85 mm, and those for f 02 = 11 GHz are moved down for s d = 2.85 mm. ...Similar publications
In this paper, a novel design of bandpass waveguide filters, using complementary split ring resonators is proposed. Resonators are implemented as inserts in a form of metal plates, with properly shaped slots, in the transverse planes of the rectangular waveguide. Filter response has been investigated for various parameters of the resonator and its...
A novel millimeter wave coplanar waveguide (CPW) fed Fabry-Perot (F-P) antenna with high gain, broad bandwidth, and low profile is reported. The partially reflective surface (PRS) and the ground form the F-P resonator cavity, which is filled with the same dielectric substrate. A dual rhombic slot loop on the ground acts as the primary feeding anten...
A novel dual‐mode ridged substrate integrated waveguide (RSIW) cavity resonator with miniaturized dimension and independently controllable resonant frequencies is proposed. The ridge patch is designed on the upper surface of the bottom substrate, connected with five shorting vias and etched with four slots. Attributed to the ridge structure, the re...
A planar cavity is proposed, designed, and implemented with a hybrid substrate integrated waveguide (SIW) and periodically drilled substrate integrated waveguide (PDSIW) structure. Air holes are added to synthesize a lower effective permittivity. The periodicity can increase the stored energy and improve the quality factor. The optimal ratio betwee...
Citations
... Waveguide microwave filters are widely used in modern radar and communication systems, especially for centimeter [1][2][3][4][5][6] and millimeter 7,8 waves due to the low losses and high power handling. Currently, the computer simulation of complex 3D waveguide elements and devices is most often performed with use of computer-aided design (CAD) tools based on various numerical methods. ...
A novel approach to the synthesis of waveguide band‐pass elliptic filters on the transverse metal resonant diaphragms with the complex aperture is proposed. The aperture of the diaphragm is considered to be a rectangular window with two L‐shaped metal ridges. For the complex conductivity of the diaphragm, we solve the corresponding electrodynamic problem. We also construct and investigate an equivalent circuit of the resonant diaphragm containing a series‐parallel LC circuit. The geometry of the diaphragm aperture is found to be corresponding to the parameters of the equivalent circuit. We construct a third‐order elliptic filter and provide a computer simulation of the diaphragms satisfying the amplitude‐frequency characteristics of its resonators. We show that some resonators can be located on one complex resonant diaphragm, which then reduces the length of the filter. The band‐pass filter for a rectangular waveguide WR137 is developed and manufactured. The central frequency of the filter is 6.6 GHz, the passband width 7.5 % with return loss of −20 dB, and the total length is 34 mm.
... As for the third-order singleband bandstop filter with SRRs, a very compact design using the perturbed quarter-wave transformer is reported in [33]. The third-order dual-band bandstop filter using SRRs is designed in [34], where SRRs for the specified stopband are separated by the quarter-wave waveguide sections acting as immittance inverters. The length of the dual-band bandstop filter is attributed to the quarter-wave inverter for the lower stopband. ...
... Compared to the H -plane dual-band bandstop filters with independently tunable stopbands, which are DBBWF designed herein and filter using conventional quarter-wave inverter [34], proposed CDBBWF is significantly improved in terms of compactness. DBBWF and filter proposed in [34] are of lengths of 0.5 λ g , while CDBBWF is 32% smaller in length. ...
... Compared to the H -plane dual-band bandstop filters with independently tunable stopbands, which are DBBWF designed herein and filter using conventional quarter-wave inverter [34], proposed CDBBWF is significantly improved in terms of compactness. DBBWF and filter proposed in [34] are of lengths of 0.5 λ g , while CDBBWF is 32% smaller in length. As for the E-plane filters having the same functionality of two individually tunable stopbands as our CDBBWF, comparison can be conducted concerning length of the filter. ...
This paper proposes a third-order miniaturized H-plane dual-band bandstop waveguide filter. Split ring resonators (SRRs), in the form of printed-circuit inserts, are used for the filter design. A simple and straightforward novel design algorithm for the waveguide SRR is introduced, which provides essential foundation for the development of the H-plane filter with multiple individually tunable stopbands. The third-order H-plane dual-band bandstop filter is implemented using SRRs for each stopband separated by quarter-wavelength waveguide sections to realize the immittance inverters for the corresponding center frequencies. Miniaturization of the filter is accomplished by the use of a properly designed insert within the waveguide section acting as the inverter. To demonstrate the usefulness of the proposed novel design algorithm and miniaturization concept, a compact H-plane dual-band bandstop waveguide filter is designed featuring independent control of the specified stopbands. The stopbands are located at center frequencies \(f_{01}=8.90\hbox { GHz}\) and \(f_{02}=10.90\hbox { GHz}\) and exhibit equal bandwidths of 340 MHz. The undesirable coupling between the SRRs for different stopbands on the insert is eliminated, along with their respective couplings to the additional insert for the inverter miniaturization. Thus, each of the stopbands is flexibly tuned by the adjustment of dimensions of the particular SRR. The proposed design using a shorter inverter preserves the characteristics of the conventional filter, while the improvement of the overall device in terms of compactness is 32%. The designed compact H-plane dual-band bandstop waveguide filter is experimentally validated, and the three-dimensional electromagnetic simulation and measurement results are in good agreement.
... As for the third-order singleband bandstop filter with SRRs, a very compact design using the perturbed quarter-wave transformer is reported in [33]. The third-order dual-band bandstop filter using SRRs is designed in [34], where SRRs for the specified stopband are separated by the quarter-wave waveguide sections acting as immittance inverters. The length of the dual-band bandstop filter is attributed to the quarter-wave inverter for the lower stopband. ...
... Compared to the H -plane dual-band bandstop filters with independently tunable stopbands, which are DBBWF designed herein and filter using conventional quarter-wave inverter [34], proposed CDBBWF is significantly improved in terms of compactness. DBBWF and filter proposed in [34] are of lengths of 0.5 λ g , while CDBBWF is 32% smaller in length. ...
... Compared to the H -plane dual-band bandstop filters with independently tunable stopbands, which are DBBWF designed herein and filter using conventional quarter-wave inverter [34], proposed CDBBWF is significantly improved in terms of compactness. DBBWF and filter proposed in [34] are of lengths of 0.5 λ g , while CDBBWF is 32% smaller in length. As for the E-plane filters having the same functionality of two individually tunable stopbands as our CDBBWF, comparison can be conducted concerning length of the filter. ...
This paper proposes a third-order miniaturized H-plane dual-band bandstop waveguide filter. Split ring resonators (SRRs), in the form of printed-circuit inserts, are used for the filter design. A simple and straightforward novel design algorithm for the waveguide SRR is introduced, which provides essential foundation for the development of the H-plane filter with multiple individually tunable stopbands. The third-order H-plane dual-band bandstop filter is implemented using SRRs for each stopband separated by quarter-wavelength waveguide sections to realize the immittance inverters for the corresponding center frequencies. Miniaturization of the filter is accomplished by the use of a properly designed insert within the waveguide section acting as the inverter. To demonstrate the usefulness of the proposed novel design algorithm and miniaturization concept, a compact H-plane dual-band bandstop waveguide filter is designed featuring independent control of the specified stopbands. The stopbands are located at center frequencies f01=8.90 GHzf01=8.90 GHz and f02=10.90 GHzf02=10.90 GHz and exhibit equal bandwidths of 340 MHz. The undesirable coupling between the SRRs for different stopbands on the insert is eliminated, along with their respective couplings to the additional insert for the inverter miniaturization. Thus, each of the stopbands is flexibly tuned by the adjustment of dimensions of the particular SRR. The proposed design using a shorter inverter preserves the characteristics of the conventional filter, while the improvement of the overall device in terms of compactness is 32%. The designed compact H-plane dual-band bandstop waveguide filter is experimentally validated, and the three-dimensional electromagnetic simulation and measurement results are in good agreement.
... Such model can be found in the available literature [10, 11], and it is also investigated in detail in [33]. Another planar insert with SRR (type 2), introduced in [34, 35], is implemented as a small dielectric plate (it is significantly smaller than the waveguide cross‐section), attached to the top and bottom waveguide walls by thin dielectric strips. The waveguide resonator using this type of resonating insert is also shown in Figure 5a. ...
... First, third‐order bandstop filters with f 0 = 9 GHz and f 0 = 11 GHz, each having a single rejection band, are designed. Based on that, by combining elements of these single‐band filters, third‐order dual‐band filter is designed with f 01 = 9 GHz and f 02 = 11 GHz, and each rejection band has the same 3‐dB bandwidth of 335 MHz [35]. For the bandstop filter, it is convenient to have LC circuits, representing resonators, connected in series; thus, the inverters are used and the parameters of the resonators are determined as explained in [26]. ...
... The 3D model of the filter is shown in Figure 12b. The inserts are optimally positioned so the inverters can be properly realized between the corresponding resonators, as explained in details in [35]. Comparison of the amplitude responses of the microwave circuit and 3D EM model is given in Figure 12c, showing good matching of the obtained results and confirming the proposed filter design. ...
Microwave filter design is a popular topic in the area of modern microwave engineering. Novel technologies, novel applications and more demanding component miniaturization are some of the key drivers for the development of novel microwave filters. For the systems operating with high power and low losses, waveguide filters represent sustainable solutions, in spite of their size. Herein, a method for the advanced bandpass and bandstop waveguide filter design is presented. Properly designed printed-circuit inserts, with simple resonators, are used as resonating elements inside a standard rectangular waveguide. In this manner, multi-band bandpass or bandstop waveguide filters are developed. Multiple resonant frequencies can be obtained using single insert, with properly positioned resonators. Filter design is exemplified by numerous three-dimensional electromagnetic models of the considered structures, equivalent microwave circuits and fabricated devices. Some of the advantages of the proposed design are simplicity, ease of implementation, possibility of miniaturization and experimental verification. The waveguide filters considered here are designed to operate in the X frequency band, so their application is recognized with the radar and satellite systems. Further improvement of the proposed method is possible, according to the future use of the presented devices.
... Authors in [8] present the H-plane filter using horizontal and vertical stepped thin wire conductors connecting the opposite waveguide walls. The usefulness of the SRRs is verified for compact waveguide H-plane filter design in [9][10][11][12][13] and for the E-plane filter design in [14][15][16][17]. ...
... For the implementation of the H-plane filter, SRRs in the form of the printed-circuit inserts are positioned in the transverse plane of the standard WR-90 waveguide [11,12]. The printed-circuit inserts are implemented using copper clad PTFE/woven glass laminate (TLX-8) with the parameters: ε r = 2.55, tanδ = 0.0019, h = 1.143 mm and t = 0.018 mm. ...
... A third-order bandstop waveguide filter using SRRs is designed for the center frequency f 0 = 11 GHz [11,12]. 3D model of the filter is shown in Fig. 10a, and its response is given in Fig 10b. ...
This paper presents results of a study on a bandpass and bandstop waveguide filter design using printed-circuit discontinuities, representing resonating elements. These inserts may be implemented using relatively simple types of resonators, and the amplitude response may be controlled by tuning the parameters of the resonators. The proper layout of the resonators on the insert may lead to a single or multiple resonant frequencies, using single resonating insert. The inserts may be placed in the E-plane or the H-plane of the standard rectangular waveguide. Various solutions using quarter-wave resonators and splitring resonators for bandstop filters, and complementary split-ring resonators for bandpass
filters are proposed, including multi-band filters and compact filters. They are designed to operate in the X-frequency band and standard rectangular waveguide (WR-90) is used. Besides three dimensional electromagnetic models and equivalent microwave circuits, experimental results are also provided to verify proposed design. Another aspect of the research represents a study of imperfections demonstrated on a bandpass waveguide filter. Fabrication side effects and implementation imperfections are analyzed in details, providing relevant results regarding the most critical parameters affecting filter performance. The analysis is primarily based on software simulations, to shorten and improve design procedure. However, measurement results represent additional contribution to validate the approach and confirm conclusions regarding crucial phenomena affecting filter response.
... There are also multiband solutions, as in [8], and compact waveguide filters, as in [9][10][11]. Bandstop waveguide filters with multiple rejection bands have also been implemented using SRRs, as presented in [12][13][14]. Finally, an H-shaped metamaterial unit cell structure, with split-square resonators, placed between waveguide ports, provided multiple stop bands [15]. ...
This paper presents an investigation of various phenomena significant for the fabrication process of waveguide structures and their influence on the frequency response. We consider a bandpass waveguide filter implemented using printed-circuit inserts, placed in the transverse plane of a standard WR-90 rectangular waveguide. The filter response is investigated with respect to the implementation technology of the printed-circuit inserts, imperfections of the machine used for fabrication, and precise positioning of the inserts. WIPL-D software is used to accurately model the considered waveguide structures, including the aforementioned phenomena related to the fabrication process. Also, experimental verification is performed to validate the simulation results. The main result of this work is identification of crucial parameters affecting the filter performance. The analysis carried out in this research is important for robust, practical waveguide filter design and implementation.
... Particularly, examples of multi-band waveguide¯lters, using printed-circuit inserts, have been reported either as bandpass [2][3][4] or bandstop. [4][5][6][7][8][9] Design of compact structures sets more and more demanding requirements regarding component miniaturization. Having this in mind, compact waveguide¯lter design is another signi¯cant issue to be considered. ...
A novel compact dual-band bandpass waveguide filter is presented in this paper. H-plane metal inserts with complementary split-ring resonators are implemented as resonating elements in the standard (WR-90) rectangular waveguide. Design starts from the models of the waveguide resonators with two resonant frequencies (9 GHz and 11 GHz) using a single flat or folded metal insert. Further, folded inserts are used for the second-order dual-band filter design. The equivalent circuits are proposed for the considered waveguide resonators and filter. A good agreement of the amplitude responses obtained for three-dimensional electromagnetic models and microwave circuits is achieved. Finally, compact dual-band bandpass waveguide filter is proposed as a novel solution using miniaturized inverters for both central frequencies. Compact filter model is further modified in order to obtain solution customized for easier fabrication. For the compact filter model, amplitude response is experimentally verified. The required filter response is preserved, as verified by a good agreement of the results obtained for the original dual-band filter and for the compact filter solutions.
... Miloš Sada u radu predstavljamo talasovodni filtar, nepropusnik učestanosti, koji pruža lak pristup rezonantnim elementima filtra, kako bi se na njih mogalo spolja utuicati i podešavati učestanost nepropusnog opsega. Ovim smo načinili pomak u odnosu na slične talasovodne filtre bazirane na štampanoj tehnologiji [5]. U slučajevima gde to može biti od značaja, ovakva realizacija takođe i poboljšava hlađenje rezonantnog elementa njegovim prijanjanjem uz zid talasovoda. ...
U radu je po prvi put prikazan inverzni ENZ kanal, koji se ponaša kao nepropusnik opsega. Date su zavisnosti rezonantnih učestanosti i Q faktora od dimenzija kanala i njegove pozicije u pravougaonom talasovodu za tri moguće realizacije kanala. Na kraju su pokazane mogućnosti projektovanja podesivog filtara nepropusnika opsega sprezanjem inverznih ENZ kanala. Simulacije su radjene na X opsegu pomoću programa HFSS.
... U novijim istraživanjima iz ove oblasti, kao rezonantne prepreke koriste se polutalasni [3][4][5][6] ili četvrttalasni rezonatori [7]. Projektuju se filtri koji primenom ovih rezonatora ostvaruju dva ili više opsega učestanosti [8]. ...
Novel implementation of microwave waveguide filter with two rejection bands is presented in this paper.
Quarter-wave resonators are implemented in planar technology, and in the research, they are used as
resonant septa inserted in the waveguide. Resonators with single resonant frequency are considered, as
well as their equivalent circuits. The observed resonator responses are analyzed in details, in order to
design second-order filter with a single rejection band. Mutual coupling between the resonators on the
same printed-circuit insert is investigated. The second-order filter with two stopbands is implemented
using observed resonators and the proposed method for filter design. The proposed method for filter
design opens possibility for realization of higher order filters with multi-stopbands.
