Microwave and Optical Technology Letters最新文献_第10页

Design of Tri-Band Doherty Power Amplifier Using Phase and Impedance Constrained Optimization

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-01-10 DOI: 10.1002/mop.70100

Wa Kong, Yunqin Chen, Jing Xia, Zhongpeng Ni, Shaohua Ni, Wence Zhang, Xiao-Wei Zhu

{"title":"Design of Tri-Band Doherty Power Amplifier Using Phase and Impedance Constrained Optimization","authors":"Wa Kong, Yunqin Chen, Jing Xia, Zhongpeng Ni, Shaohua Ni, Wence Zhang, Xiao-Wei Zhu","doi":"10.1002/mop.70100","DOIUrl":"https://doi.org/10.1002/mop.70100","url":null,"abstract":"<div>\u0000 \u0000 <p>To realize the wideband and efficient operation of Doherty power amplifier (DPA) in multi-band mode, this paper proposes a tri-band DPA design method based on phase and impedance-constrained optimization. First, the phases required for impedance transformation networks across multi-band are determined based on the impedance required when the DPA operates at back-off power (BOP) and saturation. Then, the impedance judgment method using multiple impedance constraint circles was employed to determine the optimal load impedances. Finally, the phase and impedance constraints at multiple frequencies were used to optimize the carrier and peaking output matching networks. For verification, a tri-band DPA operating at 1.25−1.35, 1.9−2.1, and 2.75−2.85 GHz was designed and fabricated. Measured results show that, for the above three frequency bands, the drain efficiencies (DEs) at saturation reach 59.0%−61.7%, 59.5%−64.2%, and 52.4%−59.8% with corresponding output power exceeding 43 dBm. For 6 dB BOP, the DEs are 46.1%−54.2%, 50.4%−55.2%, and 44.8%−51.9%. Moreover, good linearity can be achieved after linearization for 20 MHz modulated signals.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114113","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}

引用次数: 0

A Trace C2H2 Detection Based on Near-Infrared Dual-Comb Spectroscopy

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-01-10 DOI: 10.1002/mop.70073

Shuangquan Rong, Xiaocong Sun, Yuqi Yang, Yueting Zhou, Ting Gong, Mengpeng Hu, Qiang Wang, Xuanbing Qiu, Chuanliang Li

{"title":"A Trace C2H2 Detection Based on Near-Infrared Dual-Comb Spectroscopy","authors":"Shuangquan Rong, Xiaocong Sun, Yuqi Yang, Yueting Zhou, Ting Gong, Mengpeng Hu, Qiang Wang, Xuanbing Qiu, Chuanliang Li","doi":"10.1002/mop.70073","DOIUrl":"https://doi.org/10.1002/mop.70073","url":null,"abstract":"<div>\u0000 \u0000 <p>To achieve low-concentration measurement using near-infrared dual-comb spectroscopy (DCS), this study presents a trace C<sub>2</sub>H<sub>2</sub> detection using near-infrared DCS. A multi-pass gas cell is employed to extend the optical path length, improving the sensor's sensitivity. Signal post-processing via interpolation method is applied to reduce noise and achieve a flatter dual-comb. The sensor's sensitivity and transient characteristics are evaluated by selecting absorption lines at 6526.53, 6529.17, and 6531.78 cm<sup>−1</sup>, with the experimental profile being well-fitted by a Voigt function. The stability of the system is confirmed with a C<sub>2</sub>H<sub>2</sub> concentration of 200 ppm over a 2.5 h observation period, showing a stability better than 2.305 × 10<sup>−2</sup>. Allan variance analysis indicates an optimal integration time of 597 s, yielding a minimum detection limit of 6.15 × 10<sup>−4</sup> for absorbance and 350 ppb for concentration. Additionally, the detection of nine absorption lines demonstrates the multi-peak measurement capability, with deviations ranging from 0.059% to 12.496%.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143114112","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}

引用次数: 0

Strain-Engineered Germanium Microbridge LED With Silicon Nitride Stressor

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-01-10 DOI: 10.1002/mop.70086

Bin Shu, Bingzhang Zhu, Xinyang Sun, Zhichao Yu, Huiyong Hu, Liming Wang, Tian Miao, Ningning Zhang

引用次数: 0

Monitoring of the Curing Process for Lining Materials Based on Terahertz Time-Domain Reflective Spectroscopy

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-01-09 DOI: 10.1002/mop.70104

Siyi Han, Wenhui Yan, Yiran Ju, Qiang Zhang, Yuping Liu, Zhiyong Wei, Jing Xu, Yuejin Zhao, Cunlin Zhang, Zhenwei Zhang

{"title":"Monitoring of the Curing Process for Lining Materials Based on Terahertz Time-Domain Reflective Spectroscopy","authors":"Siyi Han, Wenhui Yan, Yiran Ju, Qiang Zhang, Yuping Liu, Zhiyong Wei, Jing Xu, Yuejin Zhao, Cunlin Zhang, Zhenwei Zhang","doi":"10.1002/mop.70104","DOIUrl":"https://doi.org/10.1002/mop.70104","url":null,"abstract":"<div>\u0000 \u0000 <p>As a bonding material for bonding the shell and propellant in the combustion chamber of solid rocket motor, the liner plays a protective role for the engine. Only when the liner is in a “semi-solidified state” can the charge quality be guaranteed, and it is easy to cause the phenomenon of unstable bonding interface if the charge is loaded too early or too late. Therefore, noncontact monitoring of the gradual solidification process of the material from liquid state can prevent the problems of unstable bonding interface and significantly improve the safety of solid rocket motors. In this paper, the reflective terahertz time-domain spectroscopy technology is used to monitor the curing process of lining materials, extract the refractive index spectra of samples with different curing degrees, establish the relationship between refractive index and curing reaction time, and compare it with the material loss factor obtained by rheometer to establish the correlation between refractive index and material loss factor. The experimental results show that the refractive index decreases gradually during the curing process, and the correlation coefficient between the refractive index and material loss factor is higher than 0.9. With the curing reaction, the refractive index can accurately reflect the curing process of polyurethane materials. This study provides an effective means for monitoring the curing process of lining materials.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143113612","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}

引用次数: 0

Millimeter-Wave Ultra-Wideband Compact Wilkinson Power Divider Based on Auxiliary Resonance Network

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-01-09 DOI: 10.1002/mop.70101

Qijun Lu, Dawei Han, Hao Zhang, Tao Zhang, Zhangming Zhu

引用次数: 0

Electrically Tunable Substrate Integrated Waveguide Equalizer With Stable Insertion Loss in High Frequency

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-01-09 DOI: 10.1002/mop.70084

Lifeng Chen, Fei Xing, Hao Peng, Na Xue, Ziyan Qi, Yu Liu, Serioja Ovidiu Tatu, Tao Yang

{"title":"Electrically Tunable Substrate Integrated Waveguide Equalizer With Stable Insertion Loss in High Frequency","authors":"Lifeng Chen, Fei Xing, Hao Peng, Na Xue, Ziyan Qi, Yu Liu, Serioja Ovidiu Tatu, Tao Yang","doi":"10.1002/mop.70084","DOIUrl":"https://doi.org/10.1002/mop.70084","url":null,"abstract":"<div>\u0000 \u0000 <p>In this letter, a novel design for an electrically tunable substrate integrated waveguide (SIW) equalizer that maintains a stable insertion loss at high frequencies, is proposed. The SIW equalizer is composed of various parallel units consisting of microwave resistor (<i>R</i>) and varactor diode (<i>C</i>). Different resistance and capacitance values, forming a complex impedance, are achieved through PIN and varactor diodes under different DC biases, respectively. It results in greater losses in the low-frequency range compared to the high-frequency range, achieving an equalization effect. Moreover, because ideal capacitors do not contribute to signal loss, the loss in the high-frequency range remains minimal and stable under certain conditions. Experimental results indicate that the equalization range in the <i>Ku</i>-band is 0.30–9.75 dB with a DC voltage range of 0–4 V, and the insertion loss change in the high-frequency band is only 0.5 dB. For the equalizer operating in the Ka-band, within a DC voltage range of 6–14 V, the equalization range is 0.30–16.60 dB, with a change in insertion loss of only 0.12 dB at high frequencies. The return losses of equalizers are all better than −12.4 dB and −11.6 dB, respectively, in <i>Ku</i>- and <i>Ka</i>-band.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143113891","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}

引用次数: 0

Dual Band Dual Polarized Aperture Coupled Based Frequency Selective Surface

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-01-09 DOI: 10.1002/mop.70102

Kachallai Narasimman Mohan, Abhijit Bhowmick, Yogesh K. Choukiker

{"title":"Dual Band Dual Polarized Aperture Coupled Based Frequency Selective Surface","authors":"Kachallai Narasimman Mohan, Abhijit Bhowmick, Yogesh K. Choukiker","doi":"10.1002/mop.70102","DOIUrl":"https://doi.org/10.1002/mop.70102","url":null,"abstract":"<div>\u0000 \u0000 <p>A polarization rotation second order dual-band aperture coupled based frequency selective surface (FSS) is presented in this letter. It produces different polarization rotation angle for both the bands. The corner truncated square patch resonators are used to examine dual-band responses. The patch resonators are placed back-to-back through metallic aperture coupled layer in the middle. Two passband responses are obtained with sub-patch resonator I (SPR I) and sub-patch resonator II (SPR II) patch resonators. In first passband, two orthogonal component provide <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <mn>18</mn>\u0000 \u0000 <msup>\u0000 <mn>0</mn>\u0000 \u0000 <mo>∘</mo>\u0000 </msup>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> $18{0}^{circ }$</annotation>\u0000 </semantics></math> phase difference. Similarly, in second passband <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msup>\u0000 <mn>0</mn>\u0000 \u0000 <mo>∘</mo>\u0000 </msup>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${0}^{circ }$</annotation>\u0000 </semantics></math> phase difference is occur. Thus, rotation in polarization is occurs in both passband. The prototype of the proposed FSS is fabricated and simulation results are verified with measured results.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143113894","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}

引用次数: 0

A W-Band Bandpass Filter With Two Controllable Transmission Zeros Based on Rectangular Resonators

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-01-08 DOI: 10.1002/mop.70094

Yao Chen, Pei Wang, Chao Luo, Kai-Yu Liu, Zhi-Min Zhang, Tao-Yu Ren, Kai-Jiang Xu, Ji-Chen Li, Zhen-Ning Li, Xi-Dong Wei

{"title":"A W-Band Bandpass Filter With Two Controllable Transmission Zeros Based on Rectangular Resonators","authors":"Yao Chen, Pei Wang, Chao Luo, Kai-Yu Liu, Zhi-Min Zhang, Tao-Yu Ren, Kai-Jiang Xu, Ji-Chen Li, Zhen-Ning Li, Xi-Dong Wei","doi":"10.1002/mop.70094","DOIUrl":"https://doi.org/10.1002/mop.70094","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, an improved W-band bandpass filter for the W-band synthetic aperture radar (SAR) system with a center frequency of 96 GHz is designed and implemented. Compared with the conventional rectangular waveguide resonator filters, two specially designed oversized rectangular waveguide cavities are combined in the structure to create two transmission zeros (TZs), which improves the sharp cutoff rate of the filter and remains the simplicity of the structure. Meanwhile, the position of each TZ is independently controlled by the dimensions of one specific oversized rectangular resonator, which makes it easier to realize a flexible and accurate design. The improved structure is analyzed, modeled and optimized to obtain a better transmission characteristic. The measured results show that the return loss of the improved W-band bandpass filter is less than −8 dB and the insertion loss is less than 1.4 dB within the passband. Additionally, the two TZs are located at 89.17 GHz and 103 GHz, respectively. These results verify the feasibility of the improved bandpass filter structure.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143113282","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}

引用次数: 0

CH4/C2H6 Dual Gas Detection System for Urban Natural Gas Inspection Based on Off-Axis Integrated Cavity Output Spectroscopy

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-01-07 DOI: 10.1002/mop.70083

Yishen Zhou, Zhao Huang, Lei Zhang, Zhening Zhang, Zixun Geng, Yiding Wang, Chuantao Zheng

引用次数: 0

Design of Microwave Photonic Filter Using Zero-Pole Placement Method With FBG Based Delay Lines

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-01-07 DOI: 10.1002/mop.70093

Rani Ankita, Somnath Sengupta

{"title":"Design of Microwave Photonic Filter Using Zero-Pole Placement Method With FBG Based Delay Lines","authors":"Rani Ankita, Somnath Sengupta","doi":"10.1002/mop.70093","DOIUrl":"https://doi.org/10.1002/mop.70093","url":null,"abstract":"<div>\u0000 \u0000 <p>A novel technique for design of microwave photonic filter using fiber Bragg grating based delay lines with zero-pole placement method has been proposed and demonstrated. The concept of linear phase based finite impulse response (FIR) filter has been utilized. The proposed work focuses on technique to compute the filter-tap coefficients for general delay-line based microwave photonic filter structures for a desired spectral response. The filter coefficients have been obtained as real and positive and treated as the reflectivities of the FBGs connected in cascade. The low-pass and multi-band pass microwave photonic filter have been realized for operation in 0.2–25 GHz microwave frequency range. The filter performance has been analyzed in terms of bandwidth, order, and size of the filter. The size of the core component of the filter or overall FBG-based delay link is obtained as 1–10 cm. The filter has been simulated both theoretically and experimentally and good agreement is achieved. The proposed design technique can also be applied for infinite impulse response (IIR) filters and as well as all classes of filters. The compact sized filter can be used for photonic-integrated circuits.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143112764","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}

引用次数: 0