A compact diamond-shaped dual-band bandpass filter with multiple transmission zeros

Alazemi, Abdullah J.

doi:10.1016/j.aeue.2023.154591

Cited by 5 publications

(7 citation statements)

References 24 publications

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“…The best way to validate the proposed filter configuration is to verify the transmission zero frequencies by setting S 21 to zero, which yields Y DE = Y DO . From [ 13 ], it is well understood that the transmission zeros do not depend on series-coupled lines—they rely on shunt-connected transmission elements. Therefore, by equating the input impedance of the TSIOS unit to zero, we get the second and fourth transmission zero frequencies as:

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Section: Design and Analysis Of Proposed Bpfsmentioning

confidence: 99%

“…The transmission zeros at f TZ 1 and f TZ 5 are the inherent transmission zeros of the series-coupled lines [ 13 ]. When the electrical length tends to 90°, the denominator of (2) with higher order terms tends to infinity, giving rise to a transmission zero at f 0 .…”

Section: Design and Analysis Of Proposed Bpfsmentioning

confidence: 99%

“…Bandpass filters are mainly transmission line-based passive devices that are used in many RF/microwave circuits and wireless communication and radar systems. They are essential front-end components that can pass signals within a certain frequency range and reject unwanted out-of-band signals [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. There are many parameters to be considered in the design and implementation of a bandpass filter, such as the design structure, size, passband frequency bandwidth, insertion loss, selectivity, roll-off rate, isolation, and stopband rejection.…”

Section: Introductionmentioning

confidence: 99%

“…Many technical solutions have been proposed to increase the filter’s frequency bandwidth, including the adoption of multiple frequency bands (dual, triple, quadruple, etc.) [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. This type of filter is excellent for multiple frequency systems such as carrier aggregation or wireless local area network (WLAN) bands.…”

Section: Introductionmentioning

confidence: 99%

“…Compact DBBPF topologies can be obtained by using a modified SIR [ 11 ] or stepped impedance loaded by stubs [ 12 ]. Another approach for obtaining DBBPFs is by the use of coupled lines [ 13 ], or by using coupled microstrip rings [ 14 ] or parallel-coupled SIR-based dual-band bandpass filters [ 15 ]. Other techniques include broadside-coupled-based DBBPF [ 16 ] or signal interference/interaction techniques [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

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Dual-Band and Wideband Bandpass Filters Using Coupled Lines and Tri-Stepped Impedance Stubs

Alazemi

2023

Micromachines

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In this paper, two bandpass filters—one with a dual-band response and the other with a wideband response—were designed, implemented, and experimented with. The filters are based on the novel combination of series coupled lines and tri-stepped impedance stubs. However, coupled lines along with tri-stepped impedance open stubs (TSIOSs) give a third-order dual passband response. The advantage of dual-band filters using coupled lines and TSIOSs is that they have wide passbands that are close together and separated by a single transmission zero. In contrast, the inclusion of tri-stepped impedance short-circuited stubs (TSISSs) instead of TSIOSs provides a fifth-order wide passband response. The advantage of wideband bandpass filters using coupled lines and TSISSs is that they have a very good selectivity factor. Theoretical analysis was carried out to validate both filter configurations. The tested bandpass filter using coupled lines and TSIOS units had two close wide passbands operating at 0.92 and 1.52 GHz center frequencies, respectively. The dual-band bandpass filter was implemented to operate in GSM and GPS applications. The first passband had a 3 dB fractional bandwidth (FBW) of 38.04%, while the second passband had a 3 dB FBW of 22.36%. The experimental result of the wideband bandpass filter (with coupled lines and TSISS units) had a center frequency of 1.51 GHz with a 3 dB fractional bandwidth of 62.91% and a selectivity factor of 0.90. A good congruence was demonstrated between the full-wave simulated and tested results for both filters.

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Section: Design and Analysis Of Proposed Bpfsmentioning

confidence: 99%

Section: Design and Analysis Of Proposed Bpfsmentioning

confidence: 99%