Microwave and Optical Technology Letters最新文献

{"title":"A Novel Filtering Dielectric Resonator Antenna With Enhanced Gain","authors":"Tiancheng Qiu,&nbsp;Gao Wei,&nbsp;Siyuan Lei,&nbsp;Min Wang,&nbsp;Changying Wu,&nbsp;Jianzhou Li,&nbsp;Kuisong Zheng","doi":"10.1002/mop.70227","DOIUrl":"https://doi.org/10.1002/mop.70227","url":null,"abstract":"<div>\u0000 \u0000 <p>In this letter, a novel rectangular filtering dielectric resonator antenna (FDRA) using a fusion design approach with enhanced gain is proposed. An extended microstrip stub and a pair of U-shape metal strips are elaborately designed and loaded to provide two radiation nulls at the edges of the passband. Besides, a mushroom-like electromagnetic band gap (EBG) structure is arranged around the DRA to generate the third radiation null. Consequently, a good filtering response is obtained without extra filtering circuits. In addition, three radiation nulls can be controlled independently by adjusting the length of the extended microstrip stub, the U-shape metal strips and sizes of EBG structure. A prototype FDRA is fabricated and measured for demonstration. The reflection coefficient, the radiation pattern, the antenna gain and total efficiency are studied, and reasonable agreement between the measured and simulated results is observed. The prototype owns a 10-dB impedance bandwidth of 12% (4.63–5.23 GHz), a peak realized gain of 7.32 dBi and a high out-of-band suppression level of 27.4 dB at the lower stopband, respectively. Besides, a cross-polarization discrimination of more than 27 dB in each plane is obtained.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dual-Polarized Stacked Patch Antenna With Wide Band Operation and High Isolation","authors":"Jeen-Sheen Row,&nbsp;Hunh-Ru Dai","doi":"10.1002/mop.70233","DOIUrl":"https://doi.org/10.1002/mop.70233","url":null,"abstract":"<div>\u0000 \u0000 <p>A design of the stacked patch antenna composed of two rectangular patches with a high aspect ratio is first investigated. With a pair of conducting pins connecting the two patches, three resonant modes of the stacked patch antenna with proximity-coupled feed can be properly coupled, and a broadband operation is obtained. Based on such a long-strip-shaped antenna structure, a compact dual-polarized array is then designed. Simulated results demonstrate that the proposed array can give an isolation level of more than 45 dB between the two orthogonal input ports in an impedance bandwidth of about 30%; moreover, a peak gain of 12 dBi and an average gain of 11 dBi are also achieved. The key parameters of the stacked antenna are analyzed to show how to couple the resonant modes together. A dual-port dual-polarized antenna prototype is also constructed, and the measured results validate the simulation data.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143938932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3D Printed High-Gain W-Band Circularly Polarized Lens-Corrected Horn Antenna With Improved Bandwidths","authors":"Hao-Zheng Yang,&nbsp;Shi-Wei Qu,&nbsp;Shiwen Yang","doi":"10.1002/mop.70220","DOIUrl":"https://doi.org/10.1002/mop.70220","url":null,"abstract":"<div>\u0000 \u0000 <p>This letter presents a novel design for a high-gain circularly polarized (CP) lens-corrected horn antenna tailored for <i>W</i>-band application. The 3D printed lens comprises dielectric units of varying lengths that serve dual functions: acting as both a circular polarizer and a phase shifter. A linearly polarized (LP) feed horn illuminates the lens, enabling wideband CP radiation through the simultaneous operation of these dual functions. Experimental results demonstrate that the proposed CP lens antenna exhibits excellent operating bandwidths. Compared to previous high-gain horn antennas with lenses or metasurfaces, the 3-dB gain bandwidth and 3-dB axial ratio (AR) bandwidth are enhanced to 39.6% and 53.2%, respectively. This study offers an innovative and cost-effective solution for achieving wideband circular polarization with a high gain in <i>W</i>-band applications.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143930467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Wideband Circularly Polarized Transmitarray Antenna With a Planar Feeder","authors":"Miaojuan Zhang,&nbsp;Wei Qin,&nbsp;Xin-Hao Ding,&nbsp;Yue Cao","doi":"10.1002/mop.70219","DOIUrl":"https://doi.org/10.1002/mop.70219","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, a wideband circularly polarized transmitarray antenna with a planar feeder is proposed. The proposed <i>circularly polarized</i> antenna comprises a planar circularly polarized feeder and a transmitarray antenna (TA) based on receiving-transmitting element. The TA element uses a circular patch with an open U-shaped slot and a diagonal rectangular slot as the receiving patch, transmitting energy through a metallized via transmitting energy and a same-shaped circular patch with an open U-shaped slot and a diagonal rectangular slot as the transmitting patch. At the same time, a 360° phase compensation is performed by rotating the transmitting patch with the metallized via as the center. For verification, the TA containing 225 elements was modeled, fabricated, assembled, and tested. The measurements show that the <i>circularly polarized</i> antenna has a 3 dB gain bandwidth of 15.7%, a 3 dB axial ratio bandwidth of 21.7% and a peak gain of 22dBi. The proposed circularly polarized antenna has many advantages of high gain, wide bandwidth, low cost and can achieve circularly polarization, which can be used in millimeter-wave satellite communications.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143925739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Compact Filtering Microstrip Antenna With Enhanced Out-of-Band Suppression","authors":"Jinke Shi,&nbsp;Yijing He,&nbsp;Houjun Sun","doi":"10.1002/mop.70229","DOIUrl":"https://doi.org/10.1002/mop.70229","url":null,"abstract":"<div>\u0000 \u0000 <p>A compact filtering microstrip antenna with high selectivity and enhanced out-of-band suppression is presented in this article. Significantly reduced dimension is realized by incorporating a capacitive blind-via fence on the radiating apertures of a square microstrip antenna. Then, two pairs of quarter-wavelength open-ended slots are etched onto the patch to generate two radiation nulls precisely positioned at the upper and lower band edges. Additionally, two U-shaped slots are strategically employed at the center of the patch to mitigate strong current distribution, thereby significantly improving out-of-band suppression. Finally, an out-of-band suppression of 12.9 dB is attained up to 2.1<i>f</i>₀ (<i>f</i>₀ is the center frequency). As a proof of concept, a prototype with a compact size of 0.19 λ₀ × 0.19 λ₀ is fabricated and tested, showing a −10 dB-impedance bandwidth of 1.85 ~ 1.98 GHz and an average gain of 6.4 dBi. With the advantages of compact size, high selectivity and wideband out-of-band suppression, the proposed filtering antenna exhibits potential usages in compact wireless communication system.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143925740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Implementation and Verification of a Parallel-Plate-Waveguide-Based Transmissivity/Reflectivity Measurement System at 1–2 GHz","authors":"Haitian Zhou,&nbsp;Haidong Chen,&nbsp;Jieyao Yang,&nbsp;Xi Dai,&nbsp;Mu Tan,&nbsp;Shuyou Gan,&nbsp;Quan Xue,&nbsp;Wenquan Che","doi":"10.1002/mop.70225","DOIUrl":"https://doi.org/10.1002/mop.70225","url":null,"abstract":"<div>\u0000 \u0000 <p>In this study, the reflectivity and transmissivity measurement methods are reviewed and a parallel-plate-waveguide (PPW)-based measurement system operated at 1–2 GHz is designed, implemented, and verified. The proposed method has remarkable advantages of easy installation, compact configuration, low cost, simple process, and high accuracy which demonstrates the sophistication in measuring the reflectivity and transmissivity and can be a guide of the electromagnetic parameter measurement at lower frequencies.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143925741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Full Duty Cycle, Frequency Doubled Triangular Microwave Waveform Generation Using a DP-MZM","authors":"Sanjeev Kumar Raghuwanshi,&nbsp;Vikash Kumar,&nbsp;Chandan Kumar,&nbsp;Ritesh Kumar","doi":"10.1002/mop.70224","DOIUrl":"https://doi.org/10.1002/mop.70224","url":null,"abstract":"<div>\u0000 \u0000 <p>A novel, triangular microwave waveform generating technique using a polarization-multiplex optoelectronic oscillator (OEO) is proposed. The proposed method uses fundamental (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>f</mi>\u0000 \u0000 <mrow>\u0000 <mi>r</mi>\u0000 \u0000 <mi>f</mi>\u0000 </mrow>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${f}_{rf}$</annotation>\u0000 </semantics></math>) and triple frequency tone (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msubsup>\u0000 <mi>f</mi>\u0000 \u0000 <mrow>\u0000 <mi>r</mi>\u0000 \u0000 <mi>f</mi>\u0000 </mrow>\u0000 \u0000 <mo>′</mo>\u0000 </msubsup>\u0000 \u0000 <mo>=</mo>\u0000 \u0000 <mn>3</mn>\u0000 \u0000 <msub>\u0000 <mi>f</mi>\u0000 \u0000 <mrow>\u0000 <mi>r</mi>\u0000 \u0000 <mi>f</mi>\u0000 </mrow>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${f}_{rf}^{^{prime} }=3{f}_{rf}$</annotation>\u0000 </semantics></math>) signals to drive two sub-MZMs. Thus, carrier suppression modulation along two orthogonal polarization orientations is possible. Due to harmonic injection coupling, the two OEO oscillations can be precisely adjusted at 1:3. Due to tone polarization orthogonality, photo-detection yields no cross-beating terms. While adjusting the D.C. biases and modulation indices of the two sub-MZMs, the harmonic power ratio is suitably adjusted to create triangular microwave waveforms. The suggested OEO loop techniques avoid optical filters. Proof of concept experiments show that the proposed approach generates frequency-doubled triangle microwave waveforms with full-duty cycles.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143914083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single-Polarization Single-Mode Hollow-Core Anti-Resonant Fiber With Double Tangent Circular Arc Tubes","authors":"Xu'an Liu,&nbsp;WeiXuan Luo,&nbsp;Xiaogang Jiang,&nbsp;Barerem-Melgueba Mao,&nbsp;Daru Chen","doi":"10.1002/mop.70223","DOIUrl":"https://doi.org/10.1002/mop.70223","url":null,"abstract":"<div>\u0000 \u0000 <p>We propose a novel hollow-core anti-resonant fiber (HC-ARF) with double tangent circular arc tubes (CATs) for robust single-polarization single-mode (SPSM) operation. Departing from conventional cladding-asymmetric designs, the SPSM mechanism is achieved by engineering core asymmetry via integrating dual CATs into an 8-tube single-ring HC-ARF. Finite element simulations demonstrate exceptional polarization selectivity: X-polarized fundamental mode (XPFM) and higher-order modes (HOMs) exhibit confinement losses of 4836.19 dB/m and ~300 dB/m at 1550 nm, respectively, while Y-polarized fundamental mode (YPFM) maintains ultralow loss (6.86 × 10⁻⁴ dB/m). This yields a polarization extinction ratio (PER) of 7.05 × 10⁶ and an HOM extinction ratio (HOMER) of 3.92 × 10⁵. The fiber sustains SPSM operation over a 181 nm bandwidth (1481–1662 nm) with outstanding structural tolerance to CAT ellipticity (major/minor axis variations up to 21/16 μm). This core-asymmetric HC-ARF architecture opens new avenues for polarization-sensitive applications requiring ultralow loss and broadband operation.</p></div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Novel Optical Label Switching Based on Quadrature Phase Shift Keying (DQPSK)","authors":"Longjie Huang,&nbsp;Yang Lu,&nbsp;Liang Cheng,&nbsp;Yongjian Chen,&nbsp;Yunxin Lv,&nbsp;Meihua Bi","doi":"10.1002/mop.70222","DOIUrl":"https://doi.org/10.1002/mop.70222","url":null,"abstract":"<div>\u0000 \u0000 <p>Optical label switching (OLS) has become an attractive solution for packet-based optical switching. A novel OLS method applying differential quadrature phase shift keying (DQPSK) is proposed in this paper. DQPSK is able to modulate two signals onto the same optical carrier, and the two signals could be received separately by one-bit delayed interference with different additional phases. Applying DQPSK in OLS, the two signals could be the payload signal and the label signal so they can be transmitted together but received separately. In DQPSK-based OLS, there is no crosstalk between the payload signal and the label signal, and there is no bit rate ratio limit or effective bit rate reduction. The proposed DQPSK-based OLS is demonstrated and evaluated in a simulation. The tested results verify the feasibility of the proposal.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A 28.8 GHz Fractional-N Phase-Locked Loop for Millimeter-Wave Application","authors":"Jiale Ye,&nbsp;Xiangjian Kong,&nbsp;Huanlin Xie,&nbsp;Haolang Wen,&nbsp;Chunbing Guo","doi":"10.1002/mop.70217","DOIUrl":"https://doi.org/10.1002/mop.70217","url":null,"abstract":"<div>\u0000 \u0000 <p>A 28.8 GHz fractional-N phase-locked loop (PLL) for millimeter-wave application, particularly for the frequency-modulated continuous-wave (FMCW) modulation, is presented in this paper. The PLL directly generates millimeter-wave signals using high-performance millimeter-wave voltage-controlled oscillator (VCO). The VCO provides a wide continuous tuning range for FMCW modulation, with optimizations to mitigate parasitic effects in the millimeter-wave band. The PLL is fabricated in a 65 nm CMOS technology with an area of 0.212 mm². The measurement results show that the PLL achieves a tuning range from 24.08 to 29.6 GHz, an integrated jitter of 253.1 fs at 28.8 GHz, and a power consumption of 32 mW. In fractional-N mode, the PLL achieves an integrated jitter of 328.4 fs at 29.2 GHz with a fractional division ratio of 0.5. Using the off-chip Serial Peripheral Interface (SPI) master device, the PLL generates FMCW signals in two frequency ranges: 28–28.8 GHz and 28.8–29.6 GHz. The measured FMCW sawtooth chirp, with a 142 MHz (divide-by-4) chirp bandwidth, achieves an rms-frequency modulation (rms-FM) error of 1.4 MHz.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143914084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}