Tunable Bandpass-to-Bandstop Quasi-Yagi–Uda Antenna With Sum and Difference Radiation Patterns

Malakooti, Seyed-Ali; Mousavi, Seyed Mohammad Hadi

doi:10.1109/tap.2019.2891451

Cited by 37 publications

(17 citation statements)

References 41 publications

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“…2) Switchable sum and difference radiation patterns are realized by exploiting in-built phase inversion function in the mirror arrangement of the rightmost antenna feeding structure. This sequential pattern switching is in contrast to our presented design in [31] where a double-input antenna and an external coupler were used to generate simultaneous sum and difference pattern diversity. 3) A unique combination of functionalities in a single antenna system is demonstrated, including the switchable generation of sum and difference patterns over 79.8% bandwidth, 51.3% bandpass tuning range, and 50.3% bandstop tuning range.…”

Section: Introductionmentioning

confidence: 78%

“…For hardware implementation, a number of wideband to discretely tunable narrowband [21]- [24] and wideband to continuously tunable narrowband antenna structures [25]- [29] have been presented. More recently, some tunable bandpassto-bandstop antennas have been proposed in [30], [31].…”

Section: Introductionmentioning

confidence: 99%

“…Pattern diversity is also a useful feature for cognitive radio systems for wider space signal coverage and multipath fading mitigation. To meet this requirement, dual-input antennas with sum and difference pattern diversity have widely been explored in [31]- [35]. In these studies, the use of a microwave comparator generating in-phase and out-of-phase input signals was inevitable, leading to a relatively high complexity of the overall system.…”

Section: Introductionmentioning

confidence: 99%

“…1) The allpass state of operation has been added to our previously published filter in [31]. This means that the enhanced filter features an allpass state which can be Instantaneous E-field distribution and generated radiation pattern for (a) the sum beam configuration, and (b) the difference beam configuration.…”

Section: Introductionmentioning

confidence: 99%

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Pattern-Reconfigurable Antenna With Switchable Wideband to Frequency-Agile Bandpass/Bandstop Filtering Operation

Malakooti

2019

IEEE Access

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A three-element antenna system with the ability to operate in a unique set of switchable and frequency-tunable configurations is presented here. Firstly, this antenna system can switch between sum and difference radiation patterns using a mirrored arrangement of antenna feeding lines that bypasses the need for an additional phase inverter. Secondly, the frequency response of this antenna can be switched between three states of operation, namely wideband, tunable bandpass, and tunable bandstop characteristics. Importantly, the pattern reconfigurability function can be generated in all three states of the frequency-agile response. To realize this extended set of selectable functionalities, a three-state filter and a switchable power divider are used to feed a triple-element quasi-Yagi-Uda antenna array. The proposed system is experimentally validated, demonstrating sum and difference patterns over a measured 79.8% fractional bandwidth for the wideband state of operation, and a tunability of 51.3% for the bandpass state and 50.3% for the bandstop state. INDEX TERMS Cognitive radio, pattern reconfigurability, switchable wideband to tunable filtering antenna.

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pattern-Reconfigurable Antenna With Switchable Wideband to Frequency-Agile Bandpass/Bandstop Filtering Operation

Malakooti

2019

IEEE Access

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“…Microstrip technology has been widely used in modern communication systems since it is a mature and highly reliable technology for microwave-and millimeter-wave applications [1][2][3][4][5][6][7][8][9][10][11]. In particular, multiband bandpass filters (BPFs) have been utilized in wireless communication transceivers to separate frequency spectrum in different bands.…”

Section: Introductionmentioning

confidence: 99%

A Compact C-Band Bandpass Filter with an Adjustable Dual-Band Suitable for Satellite Communication Systems

et al. 2020

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A narrowband dual-band bandpass filter (BPF) with independently tunable passbands is presented through a systematic design approach. A size-efficient coupling system is proposed with the capability of being integrated with additional resonators without increasing the size of the circuit. Two flag-shaped resonators along with two stepped-impedance resonators are integrated with the coupling system to firstly enhance the quality response of the filter, and secondly to add an independent adjustability feature to the filter. The dual passband of the filter is centered at 4.42 GHz and 7.2 GHz, respectively, with narrow passbands of 2.12% and 1.15%. The lower and upper passbands can be swept independently over 600 MHz and 1000 MHz by changing only one parameter of the filter without any destructive effects on the frequency response. According to United States frequency allocations, the first passband is convenient for mobile communications and the second passband can be used for satellite communications. The filter has very good in- and out-of-band performance with very small passband insertion losses of 0.5 dB and 0.86 dB as well as a relatively strong stopband attenuation of 30 dB and 25 dB, respectively, for the case of lower and upper bands. To verify the proposed approach, a prototype of the filter is fabricated and measured showing a good agreement between numerically calculated and measured results.

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A compact low‐cost dual‐band bandpass filter with enhanced suppression using substrate integrates suspended line technology

Zhang

Chen

2021

Micro & Optical Tech Letters

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A compact dual-band bandpass filter based on the substrate integrates suspended line platform is proposed in this letter. The design is implemented using low-cost FR-4 material, while the loss can be reduced by 3D metal connections with substrate cutout. 0.97 dB/1.6 dB improvement of insertion loss is achieved and verified at 3.45 GHz/4.9 GHz. By paralleling quarter wavelength step impedance resonators with different operating frequencies, two paths formed between source and load. Both bandwidth and location of transmission zeros can be adjusted independently. Two stubs are added working not only as feed structure but also as a stop band resonator, which can provide 20 dB out-of-band suppression up to 4.4f0. The obtained performances are good enough to compare with the state of art, though very low-cost FR-4 materials are used.

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Tunable Bandpass-to-Bandstop Quasi-Yagi–Uda Antenna With Sum and Difference Radiation Patterns

Cited by 37 publications

References 41 publications

Pattern-Reconfigurable Antenna With Switchable Wideband to Frequency-Agile Bandpass/Bandstop Filtering Operation

Pattern-Reconfigurable Antenna With Switchable Wideband to Frequency-Agile Bandpass/Bandstop Filtering Operation

A Compact C-Band Bandpass Filter with an Adjustable Dual-Band Suitable for Satellite Communication Systems

A compact low‐cost dual‐band bandpass filter with enhanced suppression using substrate integrates suspended line technology

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