Substrate Integrated Waveguide Dual-Band and Wide-Stopband Bandpass Filters

Azad, Amit Ranjan; Mohan, Akhilesh

doi:10.1109/lmwc.2018.2844103

Cited by 90 publications

(52 citation statements)

References 9 publications

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“…The comparison table also shows that the proposed filter generates highly selective passband response due to generation of three transmission zeros, compared to the dual passband filters presented in References and maintains the passband selectivity almost similar to the filters proposed in References . The 3 dB fractional bandwidth of first passband is 12.5% and that of second passband is 10.5% which is quite wide compared to 3 dB FBW of other filters . The proposed dual bandpass filter undergoes a measured insertion loss of 1 and 1.8 dB in first and second passband, respectively, which is relatively less than those filters proposed in References and nearly similar to that of the other filters listed in Table .…”

Section: Resultsmentioning

confidence: 59%

“…The proposed dual‐band bandpass filter is a second order direct coupled filter with two passbands centered at a close difference of 1.9 GHz compared to other dual passbands having greater difference in center frequencies with orders of 2 and 3 . The comparison table also shows that the proposed filter generates highly selective passband response due to generation of three transmission zeros, compared to the dual passband filters presented in References and maintains the passband selectivity almost similar to the filters proposed in References . The 3 dB fractional bandwidth of first passband is 12.5% and that of second passband is 10.5% which is quite wide compared to 3 dB FBW of other filters .…”

Section: Resultsmentioning

confidence: 62%

“…A comparison of the proposed work with other types of dual passband filters is listed in Table I which shows the beneficial characteristics of the proposed filter compared to other dual passband filters. The proposed dual‐band bandpass filter is a second order direct coupled filter with two passbands centered at a close difference of 1.9 GHz compared to other dual passbands having greater difference in center frequencies with orders of 2 and 3 . The comparison table also shows that the proposed filter generates highly selective passband response due to generation of three transmission zeros, compared to the dual passband filters presented in References and maintains the passband selectivity almost similar to the filters proposed in References .…”

Section: Resultsmentioning

confidence: 63%

“…Mushroom structures are inserted inside dual layer printed circuit board bounded by SIW to generate multiple pole single passband with noticeable out of band rejection and high selectivity, although making the fabrication process unavoidably complex . Compact SIW cavities are proposed to generate dual bandpass filter by introducing perturbation vias, complementary split ring resonators (CSRRs) and perturbation slotlines into the cavity to control the individual passband although within limited range . These proposed structures generate passbands of asymmetric responses with transmission zero at one side of passband unless source load coupling is introduced to attain transmission zeros at both halves.…”

Section: Introductionmentioning

confidence: 99%

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Dual band bandpass filter based on substrate integrated waveguide loaded with mushroom resonators

Chaudhury

Awasthi

Singh

2020

Micro & Optical Tech Letters

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This article presents a dual band bandpass filter by loading two cascaded mushroom resonators inside the cavity of a rectangular substrate integrated waveguide (SIW). The passbands are generated by exciting TE101 and TE201 modes of dual mushroom structures loaded inside SIW cavity. The fundamental mode, that is, TE101 of the entire filter structure is utilized to create the first passband and the next higher order mode, that is, TE201 of the filter structure is employed for the generation of second passband. Due to the incorporation of mushroom resonators into SIW, which are composite right/left handed transmission lines, the anticipated frequency response represents highly selective passbands with three transmission zeros (TZs) and an improved out‐of‐band response beyond the second passband. The effects of some structural parameters of the filter on the control over coupling parameters (k101 and k201) and quality factor (Q) are studied. This modified SIW based dual bandpass filter is fabricated and measured to verify two passbands centered at 2.25 and 4.1 GHz with 12.9% and 10.8% fractional bandwidth (FBW) and minimum insertion loss of 0.86 dB and 1.6 dB, respectively. Mobile satellite communications, weather radar systems and Wi‐Fi technology are the actual fields where such bandpass filters can be thoroughly applied.

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Section: Resultsmentioning

confidence: 59%

Section: Resultsmentioning

confidence: 62%

Section: Resultsmentioning

confidence: 63%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dual band bandpass filter based on substrate integrated waveguide loaded with mushroom resonators

Chaudhury

Awasthi

Singh

2020

Micro & Optical Tech Letters

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“…In recent years, many filters based on SIW technique with different SIW topologies are adopted to achieve higher selectivity and high Q-factor as illustrated in refs. [21][22][23][24][25][26][27][28] . In addition to SIW technique, complementary split ring resonators 24 (CSRRs), E-shaped slot lines, 25 folding technique, 26 are also included in filter circuits to improve the filtering performances.…”

mentioning

confidence: 99%

Filtennas for wireless application: A review

Mishra

Lalitha

2019

Int J RF Microw Comput Aided Eng

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In recent year, various filtenna circuits have been developed satisfying the objectives and prerequisites of wireless communication. Some of these developed designs are new or some are the improved version of previous works whereas the others are the combination of conventional methods. This article presents the review of filtenna circuits starting from the beginning to the improvements until date. This article starts with brief overview of various filters with their design strategies and ends in its implementation in filtenna designs followed by discussion on several filtenna designs in term of size and overall performances. Among various designs, bandpass, and bandstop filters are extensively used in filtenna realization as it provides a better selectivity in desired band. Various planar filtenna circuits, based on either defected ground structure (DGS) or resonator or SIW filters are reviewed and presented. Besides, planar filtennas, these filters are also integrated to the aperture of horn antennas for the realization of horn filtennas, applicable for high frequency operations. It is observed that SIW based filtennas exhibited narrow impedance bandwidth. This feature can be improved by doubling substrate layer as well as the number of metallic ways. Whereas, resonator based filtennas use resonator based filters along with DGSs to enhance impedance bandwidth as well as minimize mutual coupling and cross‐polar radiation. Apart from single element filtenna, filtenna arrays, and reconfigurable filtennas (including planar and horn reconfigurable filtennas) are presented. This review article may be helpful for beginners working on filtenna circuits and also such a review process is not available in the open literature to the best of author's knowledge.

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Dual‐band bandpass filter using two simple coupled microstrip rings

Zhang

Chen

2020

Engineering Reports

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A new dual‐band bandpass filter (BPF) using two very simple coupled microstrip rings is proposed in this paper. The two identical 3λg/2 microstrip rings are coupled each other with λg/2 coupled length, resulting in the generation of dual frequency bands with multiple transmission zeros (TZs). Theoretical deduction is presented to verify the proposed structure. The center frequencies and bandwidths of the two passbands can be tuned by controlling the impedance parameters of the microstrip rings. For demonstration, a prototype example of this dual‐band BPF is fabricated and characterized. The measured results show that it has high selectivity and great return losses of passbands with multiple TZs at the stopband.

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Substrate Integrated Waveguide Dual-Band and Wide-Stopband Bandpass Filters

Cited by 90 publications

References 9 publications

Dual band bandpass filter based on substrate integrated waveguide loaded with mushroom resonators

Dual band bandpass filter based on substrate integrated waveguide loaded with mushroom resonators

Filtennas for wireless application: A review

Dual‐band bandpass filter using two simple coupled microstrip rings

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