Compact Microstrip Patch Antenna Research Articles

A Wideband Microstrip Patch Antenna for 60 GHz Wireless Applications

In this paper a compact microstrip patch antenna designed for the unlicensed 60 GHz millimeter-wave band applications is presented and discussed in details. The proposed antenna consists of a rectangular radiating patch with an embedded U-shape slot inside, and excited by the coaxial probe feeding technique. A wide range of parametric studies has been performed on the patch size, feeding positions and U-slot dimensions and the antenna is optimized for the best possible results. The proposed antenna configuration achieved a wide bandwidth of 15.4 GHz (25.69 %) covering the frequency range from 52.20 to 67.70 GHz. The lowest return loss of the antenna is –41.2 dB and the maximum gain obtained is 9.52 dB at the 60 GHz resonance frequency. Considering the size, bandwidth, and gain, this microstrip antenna can be a suitable candidate for the 60 GHz wireless applications for short range high speed communications. DOI: http://dx.doi.org/10.5755/j01.eee.19.9.5651

Design of an Ultra-Wideband Microstrip Patch Antenna Suspended by Shorting Pins

Designing a compact wideband microstrip patch antenna which is composed of a folded-patch feed, a symmetric E-shaped edge and shorting pins is presented in this paper. One pin is applied in order to expand the impedance bandwidth. Two other pins are utilized to miniaturize the size of patch as well. The measured impedance bandwidth ( $$\text{ VSWR}\le 2$$ ) of the fabricated antenna is more than 90 % in the frequency range 3.92---10.67 GHz for ultra-wideband (UWB) applications. The antenna size is $$0.438\lambda _{0}\times 0.365\lambda _{0}\times 0.170\lambda _{0}$$ at its center operating frequency. Also, radiation patterns with acceptable stability within the bandwidth are obtained. In addition, the effects of some key parameters are investigated to describe the performance of the proposed design.

MULTIPORT ANALYSIS BY PADÉ APPROXIMATION

In this paper, a new method to analyze arbitrary shaped microstrip patch antennas is introduced. This method uses the multiport network model (MNM) together with a mathematical called the \Pade approximation such that the antenna input impedance obtained from the multiport analysis is approximated as a rational function of polynomials. Then, the roots of the denominator of this rational function are used to determine the antenna resonant characteristics. This new method is more time e-cient than the standard multiport analysis because the evaluations are made at a single frequency. In the standard method, evaluations are made at multiple frequency values throughout the analysis. Results obtained by the new method are verifled using the examples of rectangular and slot loaded compact microstrip patch antennas. Computational efiorts for both procedures are presented.

Double U-slots patch antenna for tri-band wireless systems

A compact microstrip patch antenna with two U-slots shape is presented. Detailed simulation and experimental investigation are conducted to understand the behavior of the two U-slots. The proposed antenna generates three resonant frequencies at 2.7, 3.3, and 5.3 GHz. It can, therefore, be used in Worldwide Interoperability for Microwave Access compliant communication equipment. The proposed antenna has two U-slot shaped and two bridge elements to connect both shapes together to adapt the structure to the desired interest operating frequency. A comprehensive parametric study has been applied to understand the effect of each U-slot on the antenna's performance. Moreover, the current distribution for the three bands is investigated to give further understanding of the antenna behavior. The proposed antenna is verified experimentally and the simulated and measured results are in good agreement. © 2010 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010.

A Compact Broadband H-Slot and Horizontal H-Slot Patch Antenna for Circular Polarization

This paper presents the design of compact broadband H-slot and horizontal H-slot microstrip patch antenna with a single feed. The antenna is also used for circular polarization application with a single narrowband frequency. The performance of single feed notched and truncated corner circularly polarized microstrip antennas with the same substrate thickness for H-slot and horizontal H-slot is studied. The simulated results such as return loss S11, axial ratio AR, radiation pattern (Eleft and Eright), and gain are presented in this paper for different shapes of patch antenna.

A 4×1 L-probe fed Inverted Hybrid E-H Microstrip Patch Antenna Array for 3G Application

This paper presents a compact and broadband microstrip patch antenna array (BMPAA) with uniform linear array configuration of 4x1 element for 3G applications. The 4A—1 BMPAA was designed and developed by integrating new patch shape Hybrid E-H shape, L-probe feeding, inverted patch structure with air filled dielectric microstrip patch antenna (MPA) element. The array was constructed using two dielectric layer arrangement with a thick air-filled substrate sandwiched between a top-loaded dielectric substrate (RT 5880) with inverting radiating patch and a ground plane. The Lprobe fed inverted hybrid E-H (LIEH) shaped BMPAA achieves an impedance bandwidth of 17.32% referenced to the center frequency at 2.02 GHz (at VSWR ≤ 1.5), maximum achievable gain of 11.9±1dBi, and 23 dB crosspolarization level.

Small size quad band microstrip antenna

AbstractA novel compact microstrip patch antenna is proposed for quad band, GSM850, GSM900, GPS (L1–1575 and L2–1227), and UMTS‐2110 application for cellular telephone system. Design is particularly unique since it supports the new generation mobile phone where multiband operation with minimum size is greatly desired. Two microstrip line feeds placed in orthogonal directions are used for the excitation of the proposed antenna. Microstrip patch has been meandered to lengthen the electrical paths and to achieve quad frequency bands. Detail of design criteria with respect to physical parameters is described. Radiation Patterns and impedance bandwidths are measured and shown. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 997–1001, 2007; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.22341

Reconfigurable circularly polarized antenna for short-range communication systems

This paper describes the design rules of a compact microstrip patch antenna with polarization reconfigurable features (right-handed circular polarization (CP)/left-handed CP). The basic antenna is a circular coplanar-waveguide (CPW)-fed microstrip antenna excited by a diagonal slot and the CPW open end. This device is developed for short-range communications or contactless identification systems requiring polarization reconfigurability to optimize the link reliability. First, experimental and simulated results are presented for the passive version of the antenna excited by an asymmetric slot. A reconfigurable antenna using beam-lead p-i-n diodes to switch the polarization sense is then simulated with an electrical modeling of the diodes. Finally, the efficiency reduction resulting from the diode losses is discussed

Comparison of Several Novel Annular-Ring Microstrip Patch Antennas for Circular Polarization

Several novel compact circularly-polarized probe-fed annular-ring microstrip patch antennas are examined experimentally and numerically. In order to reduce the antenna size and provide a suitable input impedance match, two techniques are employed; the insertion of strips into the annular ring and placing a cross-slot into the ground plane. The proposed annular-ring patch with a cross-slotted ground plane yields a much smaller size for a given frequency. This novel patch antenna can effectively be reduced by about 55 percent in size compared to conventional annular-ring patch antennas. The antenna displays wide bandwidth and good circular polarization characteristics. The results of a parametric study for three novel strip-loaded annular-ring patch antennas and for the compact circular patch antenna augmented by a narrow annular ring with a cross-slotted ground plane are discussed in this paper.

A dual‐frequency compact microstrip patch antenna

In this paper, a new dual‐frequency, compact antenna, which uses an H‐shaped microstrip patch with a shorting pin, is described. Compared with the conventional rectangular patch antenna, this antenna can achieve both a significant reduction of antenna size and a dual‐frequency operation with a single feed. More freedoms for tuning the resonant frequencies, the frequency ratio, and the input impedance are available because of more design parameters. A detailed parameter study is performed, and the theoretical analysis is based on the finite difference time domain (FDTD) method. The FDTD programs are developed and validated by measurement results. The effects of several antenna parameters on two resonant frequencies, frequency ratio, and radiation pattern characteristics of the antenna are analyzed and compared. It is shown that various frequency ratios (1.91–4.23) can be obtained by varying the design parameters of this antenna. Several design curves are presented.

Dual slot-loaded compact microstrip patch antenna

Dual slot-loaded compact microstrip patch antenna

Compact microstrip patch antenna

This article describes the design and development of a relatively compact microstrip patch antenna. At resonance, the length of the antenna is approximately one-eighth of the effective wavelength. The current distribution on the patch surface has been analyzed with the use of the method of moments. © 1996 John Wiley & Sons, Inc.