H-shaped Microstrip Antenna Research Articles

Design of Superconducting H-shaped Microstrip Antennas on Anisotropic Substances Using Hybrid Cavity Model

Design of Superconducting H-shaped Microstrip Antennas on Anisotropic Substances Using Hybrid Cavity Model

Biyomedikal Uygulamalar için Esnek Alt Tabakalar Kullanarak Frekans-Yapılandırılabilir Yeni Bir Yama Anten Tasarımı

The purpose of this research was to design and implement a flexible horizontal H-shaped microstrip antenna (flexible-HHMA) using various materials for cancer tumor detection. Microstrip antennas, which can also be utilized as tumor detection sensors and can function as both a receiver and a transmitter, are composed of two major components: the patch and the ground plane. The copper tape was used to analyze various materials’ impacts on antenna performance to form the patch and ground planes, and felt, jean, and photo paper was employed as the substrate. To accomplish this, antennas operating at frequencies ranging from 2 to 10 GHz, frequently used in biomedical applications, were constructed and computations performed using a full wave electromagnetic solver based on finite integration technique (FIT). The proposed microstrip antennas may be used as sensors in biomedical measurement systems that make use of the dielectric contrast between the healthy and malignant tissues at microwave frequencies.

Performance improvement of H-Shaped antenna with Zener diode for textile applications

Wireless network becoming an integral part of daily existence, and it is expected to become much more so in the future. The dual-band frequency-reconfigurable H-shaped microstrip antenna fed by two coaxial probes is presented. The two modes for textile applications, the antenna is symmetrically filled with back-to-back attached zener diodes. The first mode’s tuneable range is between 2 GHz and 2.5 GHz, while the second mode’s range is between 1.5 GHz and 4.8 GHz. The suggested antenna’s radiation can be switched from two orthogonal linear polarizations in the 1.5 GHz to 2.5 GHz range by adjusting the capacitance of the zener diodes. The HFSS is used for designing and simulating the antenna and antenna performs well in terms of Voltage Standing Wave Ratio [VSWR], Return Loss, directivity, and cross-polarization. The antenna is constructed on a 70 mm × 50 mm with FR4 epoxy dielectric substrate; switch scale of 0.8 mm × 1.6 mm and 3.58 is relative permittivity with substratum height of 1.6 mm.

Surrogate-based computational analysis and design for H-shaped microstrip antenna

ABSTRACT A conceptual Kriging surrogate model (KSM) for the computational analysis and design of H-shaped microstrip antennas (HMAs) is proposed in this study. A dataset contains 216 simulated HMAs with different physical/electrical parameters of the HMAs and the respective resonant frequency (RF) values are employed in construction and test processes of the KSM. The performance of the KSM is tested and verified through 20 and 13 HMAs by an extensive comparison with the state-of-the-art models. The results illustrate that KSM computes the most accurate RF values of 20 and 13 HMAs with absolute percent error (APE) of 0.48% and 0.76%, respectively. Moreover, a miniaturized HMA is optimally designed through the KSM as 27% smaller than the smallest design in the dataset for operating at about 2.40 GHz. Therefore, the performance of the proposed method is validated by means of the fabrication of the miniaturized HMA.

Dual Slot H Shape Antenna for SAR Estimation

In the proposed work, H-shaped microstrip antenna is designed with two slots. Itoperates at a frequency of 2.2GHz with a FR-4 substrate. The proposed antenna is designed for UHF application like mobile communication. The dimension of the proposed antenna is 42 x 30x 1.6 mm^3. Two equal size parasitic patches are being introduced to implement the H shape and simulated using HFSS software. Further, Specific Absorption Rate (SAR) of the proposed antenna is found out. Average SAR value for this proposed design appears to be 0.39 W/Kg, which is also far less than the prescribed value by Telecom Engineering Center (TEC) of 1.6W/Kg.

An H-Shaped Microstrip Antenna with Meandered Slot Lines and H-Shaped DGS For Multiband Operation

In this paper, a microstrip antenna is presented. It has an H-shaped patch which uses meandered slots an H-shaped DGS beneath the microstrip line to support multiband operation with enhanced bandwidth. The simulated and measured results are plotted to see the performance of the antenna in terms of S11 parameter. The proposed designed resonates at 3.56, 8.04 and 10.57 GHz with a peak gain of 8.39 dB with considerable impedance bandwidth and return loss values at the desired bands. The radiation pattern plots show the conformability with the application it is designed for. The planar structure with a water-resistant substrate makes it suitable for weather radar and other 5G applications.

Tunable H-Shaped Microstrip Antenna with Dual Feeding

The design of a frequency reconfigurable dual-band H-shaped microstrip antenna fed by two coaxial probes is presented. Each probe excites one of the two fundamental modes of the antenna which are linearly polarized and orthogonal to each other. The antenna is symmetrically loaded with four varactor diodes to simultaneously tune these two modes. Simulation results show that the tunable range of the first mode is between 1.69 and 2.19 GHz (1.3 : 1 tuning ratio), whereas it is between 1.94 and 2.72 GHz (1.4 : 1 tuning ratio) for the second mode. In the range between 1.94 and 2.19 GHz, the radiation of the proposed antenna can be switched between two orthogonal linear polarizations by a simple adjustment to the capacitance of the varactor diodes. The proposed antenna achieves a good performance in terms of port-to-port isolation, directivity, and cross-polarization.

Frequency‐reconfigurable single‐ and dual‐band designs of a multi‐mode microstrip antenna

Frequency-reconfigurable designs of a probe-fed multi-mode H-shaped microstrip antenna are presented. The reconfigurability is achieved by symmetrically loading the antenna with varactor diodes. The design approach for the proposed antennas is to control the propagating modes by matching a specific mode or two modes while mismatching the other modes in order to achieve single-band or dual-band operation, respectively. The key to such approach is the careful selection of the varactors' positions and type. Two single-band designs are proposed where each tunes a different resonant mode of the H-shaped microstrip antenna. The two designs are only different in the type of the used varactors. One of these designs achieves 41% tuning range (2.22-3.37 GHz), while the other achieves 16% (3.77-4.45 GHz). A dual-band design is proposed where one of the bands is fixed at 2.728 GHz while the other is tunable. The dual-band antenna achieves a 32% tuning range (1.89-2.6 GHz) for the tunable mode. All of the designs are implemented on 80 × 80 × 1.57 mm 3 substrate with e r = 2.2. Good agreement between the measured and simulated results of these designs is observed.

Modified resonant frequency calculation for E-shaped and H-shaped microstrip patch antennas

The genetic-based approach to the modified resonant frequency calculation for E-shaped and H-shaped microstrip patch antennas is presented.Continuous parameter genetic algorithm (CPGA) has been used to modify the resonant frequency expressions of E-shaped and H-shaped microstrip antennas. The results obtained by CPGA for different antenna dimensions are compared with the experimental and theoretical results given in the literature. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:2348–2351, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26271

Analysis of tunnel diode loaded H-shaped microstrip antenna

In this paper, a compact H-shaped microstrip antenna loaded with tunnel diode is proposed and investigated theoretically. The H-shaped patch is investigated, and it has been concluded that a notch dimension of 8 mm by 6 mm gives best results. Then, the tunnel diode is loaded, which provides tunability to the microstrip antenna. The numerical results for input impedance, return loss, resonant frequency and radiation pattern are presented and compared with simulated results. The radiation pattern is varied from 63.8° to 60.6° with bias voltage, and a frequency agility of 25.28% has been achieved.

Design of a Probe-Fed H-Shaped Microstrip Antenna for Circular Polarization

A simple design of a probe-feed microstrip antenna with circular polarization (CP) radiation is presented. By embedding dual slits in a square microstrip and adjusting the sizes of the slits, an H-shaped microstrip antenna with two near-degenerate orthogonal modes for CP radiation can be achieved. This design provides a wide CP bandwidth and relaxed fabrication tolerances. Details of the antenna design are described, and theoretical and experimental results of the CP performance are presented.

An H-shaped harmonic suppression active integrated antenna

An active integrated antenna (AIA), which integrates an H-shaped microstrip antenna and a bipolar junction transistor (BJT) oscillator on a substrate, is proposed to suppress its harmonic radiation. The measurement results show good harmonic suppression. © 2006 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2006.

Multi‐band operation of a compact H‐shaped microstrip antenna

AbstractIn this paper, a multi‐band compact H‐shaped microstrip antenna is studied. The resonant modes of the H‐shaped structure are analyzed using the concept of electric and magnetic walls at the planes of symmetry. A flexible design approach that allows the pre‐selection of the resonant frequencies of the antenna is described. Approximate design equations and curves are introduced and validated by simulated and experimental results. An H‐shaped antenna is designed to support modes with resonance at 2.2, 2.8, 3, and 5 GHz. It is shown that dual‐, triple‐, or quad‐band operation is possible by the proper location of a coaxial feed. Such antennas are implemented on duroid dielectric substrate with εr = 2.2 and h = 1.57 mm. The designed antennas are simulated by IE3D software and a good agreement with experimental results is demonstrated. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 363–367, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10608

Rectangular ring and H-shaped microstrip antennas—alternatives to rectangular patch antenna

H-shaped and rectangular ring microstrip antennas have been compared with the commonly used rectangular patch antenna. It has been found that the H-shaped patch antenna is smaller in size (about half), and is broadbeam but with narrow bandwidth. On the other hand, for larger bandwidth and/or narrow beamwidth applications a rectangular ring antenna is better than a rectangular patch antenna. Because of size reduction the H-shaped patch looks attractive for UHF applications.