Microwave and Optical Technology Letters最新文献

{"title":"Ultra-Miniaturization Design of Balanced Bandpass Filter Using Substrate-Integrated Coaxial Resonators","authors":"Ci-Fang Jheng,&nbsp;Pin-Jhen Lee,&nbsp;Chung-I. G. Hsu,&nbsp;Min-Hua Ho,&nbsp;Wanchu Hong","doi":"10.1002/mop.70418","DOIUrl":"https://doi.org/10.1002/mop.70418","url":null,"abstract":"<div>\u0000 \u0000 <p>This study proposes ultra-miniaturized full- and half-mode balanced bandpass filters (BPFs) that incorporate four significantly size-reduced full and half substrate-integrated coaxial resonators (SICRs). The microstrips, in conjunction with the coupling slots, form the feeding structure of the filters. The proposed full- and half-mode SICR balanced BPFs exhibit center frequencies of 0.49 and 0.66 GHz, respectively, which are only 8.22% and 10.9% of the resonance frequency (5.96 GHz) of their substrate-integrated waveguide cavity (SIWC) counterparts. Sample full- and half-mode SICR balanced BPFs have been fabricated for measurement, and the results are consistent with the simulations. The common-mode rejection levels are greater than 50 and 48 dB, respectively, for the full- and half-mode configurations across a broad frequency range. The minimum in-band insertion losses (ILs) are approximately 1.7 dB for the full-mode configuration and 2.2 dB for the half-mode design.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 10","pages":""},"PeriodicalIF":1.2,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223807","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":"Filtering and Wide-Angle Scanning Phased Array Based on Optimized Subarray With Flat-Top Gain Curve","authors":"Qian Chen,&nbsp;You-Feng Cheng,&nbsp;Chuan-Hao Zhang,&nbsp;Cheng Liao","doi":"10.1002/mop.70421","DOIUrl":"https://doi.org/10.1002/mop.70421","url":null,"abstract":"<div>\u0000 \u0000 <p>This study presents an optimization-based approach for designing wide-angle scanning phased arrays with filtering response by synthesizing subarrays with a broadside flat-top gain curve. A dual-layer parasitic pixel surface is loaded above a four-element source subarray to provide a high degree of synthesis flexibility. Assisted by the internal multiport method-based optimization, the flat-top gain curve of the whole subarray and the heterogeneous radiation patterns of the subarray elements can both be efficiently realized under a specific pixel surface configuration. Afterward, the subarray is extended into an eight-element wide-angle scanning phased array. Simulated and measured results demonstrate that the final array can achieve the wide-angle scan from −60° to +60° within a broad active impedance band 5.0–5.9 GHz (16.5%). Besides, when the proposed phased array scans in the wide-angle range, it exhibits a good filtering response with dual radiation nulls and out-of-band suppression levels of up to 10 dB.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 10","pages":""},"PeriodicalIF":1.2,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145223808","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":"Design of a Low-Noise Amplifier With Highly Efficient Sub-Harmonic Suppression Based on a Self-Biasing Adaptive Filter for Nonlinear Radar","authors":"Kyusik Woo,&nbsp;Hyungseok Nam,&nbsp;Gia Thang Bui,&nbsp;Dang-An Nguyen,&nbsp;Chulhun Seo","doi":"10.1002/mop.70412","DOIUrl":"https://doi.org/10.1002/mop.70412","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;In nonlinear radar (NLR) systems for detecting concealed electromagnetic devices, effective suppression of the fundamental frequency (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 \u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${f}_{0}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) and amplification of the second harmonic (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 \u0000 &lt;msub&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 \u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $2{f}_{0}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;) are critical for target discrimination. This letter presents a low-noise amplifier (LNA) architecture with a self-biasing adaptive filter (SBAF) for NLRs. The proposed LNA selectively suppresses &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 \u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${f}_{0}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; and amplifies &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;mn&gt;2&lt;/mn&gt;\u0000 \u0000 &lt;msub&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 \u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; $2{f}_{0}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt; through power-aware control without external bias. The SBAF dynamically adjusts the &lt;i&gt;Q&lt;/i&gt;-factor of the output resonance circuit depending on the input power level, enabling adaptive suppression of &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 \u0000 &lt;mrow&gt;\u0000 &lt;msub&gt;\u0000 &lt;mi&gt;f&lt;/mi&gt;\u0000 \u0000 &lt;mn&gt;0&lt;/mn&gt;\u0000 &lt;/msub&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt; ${f}_{0}$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;. The circuit architecture comprises four core blocks: a BJT-based amplifier stage (BAS), a frequency-selective network (FSN), an adaptive biasing rectifier (ABR), and an active resonance circuit (ARC). A prototype was fabricated and measured at &lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 ","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 10","pages":""},"PeriodicalIF":1.2,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145224007","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 Compact 22–40.8 GHz Broadband Power Amplifier in 65 nm CMOS","authors":"Yanjie Yang,&nbsp;Weiheng Guan,&nbsp;Zhi-Xia Du,&nbsp;Chunbing Guo","doi":"10.1002/mop.70404","DOIUrl":"https://doi.org/10.1002/mop.70404","url":null,"abstract":"<div>\u0000 \u0000 <p>This brief presents a broadband millimeter wave power amplifier (PA) to support 5G wireless communication. The MOS-capacitor based neutralization technique is applied to boost the gain and enhance the stability of the PA. A strong coupled transformer structure is theoretically analyzed and designed to construct the output matching network, which provides the optimum load impedance of the PA over a wide frequency band and absorbs the output capacitance of the device. Meanwhile, the input and Interstage matching networks are designed based on the weakly coupled transformer technique to extend the working bandwidth of the PA. The PA is designed in a 65-nm CMOS process with a peak power added efficiency (PAE) of 30.8%, a saturated output power (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>P</mi>\u0000 \u0000 <mtext>sat</mtext>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${P}_{text{sat}}$</annotation>\u0000 </semantics></math>) of 17 dBm, and an output 1-dB compression point (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>P</mi>\u0000 \u0000 <mrow>\u0000 <mn>1</mn>\u0000 \u0000 <mtext>dB</mtext>\u0000 </mrow>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${P}_{1text{dB}}$</annotation>\u0000 </semantics></math>) of 12.5 dBm. The measured PA achieves 66% fractional bandwidth (FBW) from 22 to 40.8 GHz, fully cover 5G new radio (NR) frequency range 2 (FR2). The proposed PA realizes a compact size with a core area of 0.104 mm<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msup>\u0000 <mrow></mrow>\u0000 \u0000 <mn>2</mn>\u0000 </msup>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${}^{2}$</annotation>\u0000 </semantics></math>, making it very suitable for large-scale phased array beamformers.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 10","pages":""},"PeriodicalIF":1.2,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145224346","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":"Broad-Angle and Low-Scattering Microstrip Antenna Design Using Characteristic Mode Analysis","authors":"Yakun Liu,&nbsp;Biao Du,&nbsp;Dan Jia","doi":"10.1002/mop.70417","DOIUrl":"https://doi.org/10.1002/mop.70417","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper, the scattering-field formula for arbitrary angle incident plane wave is given based on characteristic mode theory. According to the formula, the modal amplitude is used as a criterion to choose significant scattering modes and a broad-angle low-scattering antenna design method is proposed. With the design method, a broad-angle low-scattering aperture-coupled microstrip antenna is designed, fabricated, and tested. Three slots are placed at the radiation patch and two pairs of slots are placed at the ground, so as to suppress the important scattering modes while keeping the radiation modes work properly. Compared to the reference antenna, the proposed antenna achieves at least 6 dB average RCS reduction (RCSR) and minimum peak RCSR of 17 dB over the broad angle of −90° to 90° from 4 to 5 GHz. Meanwhile, its transmission and radiation performance keep well from 2.81 to 2.98 GHz (5.9%) and its gain is 6.1 dBi at 2.9 GHz. The measured and simulated results are in good agreement, which validates the design method.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 10","pages":""},"PeriodicalIF":1.2,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145146627","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":"Analyzing the CPW Modes for Frequency Re-Configurability in a Wideband Cylindrical Dielectric Resonator MIMO Antenna","authors":"Poonam Kumari,&nbsp;Ravi Kumar Gangwar,&nbsp;Raghvendra Kumar Chaudhary","doi":"10.1002/mop.70410","DOIUrl":"https://doi.org/10.1002/mop.70410","url":null,"abstract":"<div>\u0000 \u0000 <p>This article presents a novel and a low-cost coplanar waveguide (CPW)—fed dielectric resonator (DR) based frequency reconfigurable multiple input multiple output (MIMO) antenna (DR–FRMA). The CPW feed excites cylindrical dielectric resonator (CDR) for generating wideband (WB) characteristics. For reconfiguring it into a narrowband antenna (NB), a PIN diode is introduced between the center feed line and one of the CPW side planes. Analyzing the CPW modes and DR modes it is found that the higher order <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>HEM</mi>\u0000 \u0000 <mrow>\u0000 <mn>11</mn>\u0000 \u0000 <mi>δ</mi>\u0000 \u0000 <mo>+</mo>\u0000 \u0000 <mn>1</mn>\u0000 </mrow>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${{HEM}}_{11delta +1}$</annotation>\u0000 </semantics></math> mode of CDR is suppressed when the image guide (IG) like CPW mode changes to the first higher order microstrip like (MSL) CPW mode for providing narrowband characteristics. The NB antenna's operational range is 3.37–3.75 GHz, whereas the WB antenna's is 3.13–6.2 GHz. Further, a prototype is fabricated and measured to validate the simulated results. The suggested MIMO antenna exhibits a peak gain of 5.9 dBi/4.2 dBi, an isolation of −16.81 dB/−16.72 dB, and an average efficiency of 91.1%/74.28% for WB/NB, respectively. Also, the radiation pattern and the antenna diversity performance characteristics make it suitable for MIMO applications.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 10","pages":""},"PeriodicalIF":1.2,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145129425","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":"Synthesis Design of Unequal Filtering Power Divider With Ultra-Wide Matching Bandwidth and Large Isolation Bandwidth","authors":"Di Wang,&nbsp;Xin Guo,&nbsp;Wen Wu","doi":"10.1002/mop.70392","DOIUrl":"https://doi.org/10.1002/mop.70392","url":null,"abstract":"<div>\u0000 \u0000 <p>In this study, two novel topologies are proposed to synthesize a class of unequal power dividers with ultra-wide matching bandwidth, good filtering performance, and large isolation bandwidth. The filtering branches of the proposed power divider consist of a network and two impedance transformers. On the one hand, the network combines the impedance network jointly realize the Chebyshev transformer function. Therefore, the designed power divider terminated with three standard 50-Ω ports can be synthesized by the prescribed return loss (<i>RL</i>) bandwidth and power dividing ratio. On the other hand, the <i>λ</i>/4 lines in the network are inherently proportional property so that one/two isolation resistors can be introduced and calculated by equations to realize the wideband filtering power dividers with unequal power division and without loss. For demonstration, examples of 4:1 and 2:1 wideband filtering power dividers with <i>RL</i> bandwidth of 100% and 120% based on the two topologies are synthesized and simulated. Subsequently, the 2:1 wideband filtering power divider is fabricated and measured. The measured results exhibit the <i>RL</i> bandwidth is 121% (|<i>S</i>₁₁|&lt;−14 dB), and large isolation bandwidth is 200% (|<i>S</i>₁₁|&lt;−13.5 dB). Satisfactory agreement between the measured results and theoretical expectations is observed, verifying the validity of the proposed design concepts.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 10","pages":""},"PeriodicalIF":1.2,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145129419","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 Low-Profile High-Performance Endfire Antenna Incorporating Parasitic Elements and Spoof Surface Plasmon Polaritons","authors":"Wei Wang,&nbsp;Ruilong Song,&nbsp;Qiuyan Song,&nbsp;Juan Xu,&nbsp;Jianchao Wang","doi":"10.1002/mop.70402","DOIUrl":"https://doi.org/10.1002/mop.70402","url":null,"abstract":"<div>\u0000 \u0000 <p>In this letter, a low-profile high-performance endfire antenna incorporating parasitic elements and spoof surface plasmon polaritons (SSPPs) is proposed. The single-layer printed circuit board is designed based on SSPPs by adding a set of fan-structured parasitic elements to increase the gain. The feed structure is in the form of a substrate-integrated waveguide (SIW), which confines the electromagnetic waves to radiate forward within a fixed range. In addition, a significant increase in operating bandwidth is achieved through the addition of a V-notch to the front end of the SIW. The SSPPs-based endfire antenna was fabricated and experimentally evaluated, demonstrating inherently superior endfire radiation characteristics. Measurement results reveal that the antenna achieves consistent endfire radiation patterns with a peak gain of 16.4 dBi and a radiation efficiency exceeding 90% across a broad operational bandwidth spanning 17.34 to 28.12 GHz. These performance metrics suggest that the proposed antenna design is highly suitable for deployment in advanced microwave communication systems, offering a promising solution for applications requiring high gain, efficiency, and wideband functionality.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 10","pages":""},"PeriodicalIF":1.2,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145129418","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":"Broadband Microwave Passive Step Attenuator Based on Imperfect Matching Theory","authors":"Jiming Chen,&nbsp;Hao Peng,&nbsp;Na Xue,&nbsp;Lifeng Chen,&nbsp;Ziyan Qi,&nbsp;Yu Liu,&nbsp;Serioja Ovidiu Tatu,&nbsp;Tao Yang","doi":"10.1002/mop.70415","DOIUrl":"https://doi.org/10.1002/mop.70415","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper presents an innovative design approach for a broadband passive step attenuator, utilizing the imperfect matching theory in the design process. To bring the actual performance of the attenuator closer to theoretical predictions, TaN resistors with the low parasitic capacitance have been redesigned. Measurement results demonstrate that the attenuator designed in this study delivers attenuation values ranging from 0 to 11 dB, with a step value of 0.5 dB. Over the wide operating frequency band from 9.65 to 30.8 GHz, the attenuator consistently maintains return losses all better than 15 dB, and insertion loss flatness within ±0.3 dB, particularly when attenuation values exceeding 3 dB. The attenuator can be realized simply with an uncut microstrip transmission line and a grounding structure, requiring no external power supply or control signals. Furthermore, it can be integrated into conventional RF circuit manufacturing processes, offering a low-cost and high-performance solution for a required attenuation with a straightforward design.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 9","pages":""},"PeriodicalIF":1.2,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145110743","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 Wideband Balun Design Using Dual RDL Glass-Based Integrated Passive Device Technology","authors":"Mincong Zheng,&nbsp;Yazi Cao,&nbsp;Qi Zhang,&nbsp;Gaofeng Wang","doi":"10.1002/mop.70405","DOIUrl":"https://doi.org/10.1002/mop.70405","url":null,"abstract":"<div>\u0000 \u0000 <p>A compact wideband balun based on dual redistribution layer (D-RDL) glass-based integrated passive device (IPD) technology is presented in this work. A novel up-down placement structure is proposed and analyzed. The adoption of the structure reduces the coupling effect between inductors while enabling chip miniaturization. Moreover, a modified balun circuit topology incorporating phase compensation structures is proposed to achieve wideband and good phase imbalance performance. The proposed balun utilizing the novel up-down placement structure has a chip size of 1.35 mm × 1.35 mm, representing about 32.5% size reduction compared to the traditional planar placement structure. Performance-wise, the balun achieves a relative bandwidth of 91.89% with amplitude and phase imbalance below 1.20 dB and 7.86°, respectively. The simulation and measured results show good consistency.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 9","pages":""},"PeriodicalIF":1.2,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145110741","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}