Compact Dual Band Research Articles

Compact multiband cuff button antenna for WBAN application

Abstract A compact dual layer conformal wearable quad band antenna is proposed for wireless body area network applications. The proposed button like patch antenna resonates at 2.5 GHz (industrial, scientific, and medical bands)/3.6 GHz sub six 5G band/5.75 GHz (wireless local area network/ISM band)/ and 9.8 GHz (X band) frequencies. The circular textile antenna is constructed with jean and polydimethylsiloxane substrate having a slotted ground of radius 10 mm and thickness 1.5 mm. The simulated gains obtained at the operating bands are 1.85/2.03/1.49/3.27 dBi, respectively. The designed antenna’s directed radiation pattern assures reduced backward radiation to body tissue. The specific absorption rate (SAR) analysis for the antenna at multiple resonant frequencies has also been reported, which are well below the SAR threshold of 1.6 W/kg for 1 gm of tissue, indicating that the model works adequately for wearable applications. The experimental characterization on- and off-body of the fabricated antenna validates the simulated results.

Compact dual-band filter using hybrid transition-free spoof surface plasmon polaritons and substrate integrated waveguide

In this paper, a new hybrid transition-free spoof surface plasmon polaritons (SSPPs)-substrate integrated waveguide(SIW) unit is used to design a compact dual-band filter. Benefiting from the combination of the H-shaped unit and the bilateral T-shaped unit of the proposed hybrid unit, the inherent two-stage wave vector matching is provided to achieve momentum and impedance matching. Thus, the proposed transition-free SSPPs-based filter does not require SSPPs transition units, making the circuit size reduction largely. Moreover, the high-order mode (Mode 1) of the transition-free SSPPs transmission units will not be suppressed by the stopband between the fundamental mode (Mode 0) and Mode 1 of transition-free SSPPs transition unit, making it possible to design a dual-band filter based on Mode 0 and Mode 1. In addition, the cutoff frequency of the filter can be controlled by the geometric size of the hybrid transition-free SSPPs-SIW unit. To verify the design theory, a compact dual-band filter with operating frequencies of 4.4 GHz − 5.6 GHz and 9.0 GHz − 9.6 GHz is designed and fabricated. The simulated results are in good agreement with the test results, indicating the feasibility of the proposed structure and design method.

Compact Dual-Band Dual-Sense Circularly Polarized Fragmental Patch Antenna Optimized by Improved Simulated-Annealing-Based Algorithm

Compact Dual-Band Dual-Sense Circularly Polarized Fragmental Patch Antenna Optimized by Improved Simulated-Annealing-Based Algorithm

A Compact Dual-Band Circularly Polarized Shared-Aperture Antenna for Satellite Communication Systems

A compact dual-band circularly polarized (CP) shared-aperture antenna is proposed for satellite communication. The antenna enables simultaneous dual-band functionality and CP radiation with right-handed CP in the Ku band and left-handed CP (LHCP) in the Ka band. The shared-aperture is implemented by integrating two independent subapertures, which function through frequency-multiplexed, resulting in a minimized profile (0.04 λ 0 ) and reduced complexity, making it an ideal choice for array applications. To enhance inter-frequency isolation, a circular arrangement of metal vias is incorporated. The measured results indicate that the antenna effectively encompasses a 3 dB axial ratio (AR) bandwidth of 15.6–16.5 GHz in Ku and 26.5–27.5 GHz in Ka bands. Additionally, it exhibits a broader 10 dB impedance bandwidth (IBW) and superior port isolation bandwidth exceeding 30 dB.

A Compact Slot-Loaded Quarter-Wave Patch with Resonance Frequency Formulation for Wi-Fi and Wi-Max Applications

A single layer and compact dual band antenna is presented for the Wi-Fi and Wi-MAX applications. A shorted quarter-wave patch is used to reduce the size. Further, a slot is cut in the non-radiating edge to create additional resonance. The impedance matching at this second resonance is enhanced by cutting a slot in the radiating edge. An equivalent circuit is suggested to explain the behavior of the proposed dual-band antenna. It is confirmed from the numerical calculation that the resonance frequency depends on the lengths l3 and l9 of the structure. The derived formulas provide the value of lengths l3 and l9 according to the user's desired frequency. The dimensions of the antenna are optimized using a commercial full-wave simulator. The concept is verified through measurements. The final design exhibits resonances at 2.44 and 3.33 GHz with a gain of 3.1 and 5.3 dBi, respectively. The cross-pol radiation levels are below 20 dB along the broadside direction.

A Compact Dual-Band Shared-Aperture Base Station Antenna Array

A Compact Dual-Band Shared-Aperture Base Station Antenna Array

Estimation of polarization diversity in CPW fed compact dual band dual sense antenna with horn slot structure: 5G and WLAN applications

Estimation of polarization diversity in CPW fed compact dual band dual sense antenna with horn slot structure: 5G and WLAN applications

A compact dual band hexagon rectangular shaped monopole antenna for WIMAX and WLAN applications

This paper presents a compact dual-band hexagon-rectangular shaped monopole antenna for WiMAX and WLAN applications. The miniaturized size of the antenna being 29 × 38 × 0.8 mm3. The proposed antenna operates efficiently within two distinct frequency ranges: 2.7 GHz to 3.2 GHz and 4.0 GHz to 5.1 GHz, addressing the needs of both WiMAX and WLAN systems. The antenna achieves bandwidths of 16.67% and 25.58% for the respective frequency bands, ensuring reliable performance and wide coverage for high-speed wireless communication. The antenna design attains its nature and application as a result of the center hexagonal shaped cavity which creates the required dual bands.

High Gain Compact Dual Band Antenna Using Frequency Selective Surface for 5G and WLAN Applications

High Gain Compact Dual Band Antenna Using Frequency Selective Surface for 5G and WLAN Applications

Compact Dual-band BPF Based on Loaded SIW with Meandered Slot Line for 5G and Beyond Applications

Compact Dual-band BPF Based on Loaded SIW with Meandered Slot Line for 5G and Beyond Applications

Compact Dual-band Monopole Antennas with Fractal-based Half- and Quarter-circular Folded Loops for WiMAX and WLAN Applications

Compact Dual-band Monopole Antennas with Fractal-based Half- and Quarter-circular Folded Loops for WiMAX and WLAN Applications

Compact Dual-Band Shared-Aperture Omnidirectional Biconical Antenna for Microwave and Millimeter-Wave Applications

Compact Dual-Band Shared-Aperture Omnidirectional Biconical Antenna for Microwave and Millimeter-Wave Applications

Compact Dual-band Antenna Based on Dual-cap Metasurface

Compact Dual-band Antenna Based on Dual-cap Metasurface

Compact Dual-band Filtering Power Divider with Low Loss and High Isolation Based on Open-Circuited Stepped-impedance Resonators

Compact Dual-band Filtering Power Divider with Low Loss and High Isolation Based on Open-Circuited Stepped-impedance Resonators

Compact Dual-band CPW-fed Circularly Polarized Slot Antenna for GNSS Applications

Compact Dual-band CPW-fed Circularly Polarized Slot Antenna for GNSS Applications

Двошаровий Т-подібний навантажений шпильковий резонатор для двоcмугового смугопропускного фільтра з покращеними параметрами

В статті розроблено простий високоефективний компактний двосмуговий фільтр на основі багатошарового Т-подібного навантаженого шпилькового резонатора T-SLHR (T-shape loaded hairpin resonator). В схемі розробленого фільтра використано дві підкладки. На заземленій площині першої підкладки реалізовані два резонатори T-SLHR, які електрично зв’язані через просторовий зазор S, завдяки чому досягається необхідна подвійна смуга пропускання. На другій незаземленій підкладці розташовується заземлений шпильковий шлейф, вхід/вихід якого з’єднується з T-SLHR для отримання необхідної характеристики фільтра. Для перевірки запропонованої концепції реалізовано двосмуговий смуго-пропускний фільтр BPF (bandpass filter) для системи багатоканальної бездротової мережі, що працює на центральних частотах 2,4 ГГц і 3,5 ГГц. Крім того, на основі теорії непарних і парних мод аналізується можливість генерації заданих частот за допомогою T-SLHR. Також, представлена блок-схема за допомогою якої пояснюється механізм зв’язку та очікувані характеристики фільтра. Крім того, змодельований фільтр був виготовлений, і отримані результати вимірювань і моделювання порівняні та проаналізовані. Виготовлений фільтр має досить малу площу менше 126 мм2, високу вибірковість завдяки високій крутизні скатів характеристики фільтра та високий рівень смуг загородження.

A Compact Dual-Band Millimeter Wave Antenna for Smartwatch and IoT Applications with Link Budget Estimation.

Advancement in smartwatch sensors and connectivity features demands low latency communication with a wide bandwidth. ISM bands below 6 GHz are reaching a threshold. The millimeter-wave (mmWave) spectrum is the solution for future smartwatch applications. Therefore, a compact dual-band antenna operating at 25.5 and 38 GHz is presented here. The characteristics mode theory (CMT) aids the antenna design process by exciting Mode 1 and 2 as well as Mode 1-3 at their respective bands. In addition, the antenna structure generates two traverse modes, TM10 and TM02, at the lower and higher frequency bands. The antenna measured a bandwidth (BW) of 1.5 (25-26.5 GHz) and 2.5 GHz (37-39.5 GHz) with a maximum gain of 7.4 and 7.3 dBi, respectively. The antenna performance within the watch case (stainless steel) showed a stable |S11| with a gain improvement of 9.9 and 10.9 dBi and a specific absorption rate (SAR) of 0.063 and 0.0206 W/kg, respectively, at the lower and higher bands. The link budget analysis for various rotation angles of the watch indicated that, for a link margin of 20 dB, the antenna can transmit/receive 1 Gbps of data. However, significant fading was noticed at certain angles due to the shadowing effect caused by the watch case itself. Nonetheless, the antenna has a workable bandwidth, a high gain, and a low SAR, making it suitable for smartwatch and IoT applications.

A Compact Dual-Band Omnidirectional Circularly Polarized Filtering Antenna for UAV Communications

A Compact Dual-Band Omnidirectional Circularly Polarized Filtering Antenna for UAV Communications

Designing a Compact Dual-Band, Dual-Polarized Antenna for Biotelemetry Communications Using the Characteristic Mode Method.

A compact dual-band, dual-polarized, implantable antenna was designed using the characteristic mode method for operation in the wireless medical telemetry service (WMTS) band (1.4 GHz) and the industrial, scientific, and medical (ISM) band (2.45 GHz). By utilizing slotting techniques and materials with high dielectric constants, the antenna volume was minimized to 47.4 mm3, and circular polarization was gained in the WMTS band by using the characteristic mode method. A three-layer physical model of human tissues was constructed in a simulation, and a biogel and minced pork were used in the measurements. The measured peak gains are -20.85 dBi (1.4 GHz) and -22.15 dBi (2.45 GHz). The measured effective axis ratio bandwidth in the WMTS band is 170 MHz (1.33-1.50 GHz, 12.0%), and the impedance bandwidth in the ISM band is 390 MHz (2.21-2.60 GHz, 16.2%). At 1.4 GHz and 2.45 GHz, the largest 1 g average SAR values are 376 W/Kg and 318 W/Kg, which comply with IEEE C95.1-1999. Moreover, when the communication chain affinity exceeds 20 dB for 1.4 GHz and 2.4 GHz, the transceiver range reaches 8.2 m and 9.7 m. This antenna can be used for implantable wireless telemetry systems.

A Compact Dual-band Hat-Shaped Antenna with Band-Specific Behavior Using Harmonic Mixer for Passive Neural Monitoring

A Compact Dual-band Hat-Shaped Antenna with Band-Specific Behavior Using Harmonic Mixer for Passive Neural Monitoring