Proximity-coupled Microstrip Antenna Research Articles

Broadband Modified Proximity Coupled Patch Antenna with Cavity-Backed Configuration

A modified proximity-coupled microstrip patch antenna with broad impedance bandwidth is proposed by incorporating proximity-coupled patch antenna into the rectangular open-ended microstrip feed line on a cavity structure. First we design a proximity-coupled microstrip antenna to have a wide bandwidth in the lower band centered at 7 GHz using a cavity-backed ground. To broaden the bandwidth of the antenna to the upper band, we then apply a rectangular open-ended microstrip feed line, adjusting the relative position to the cavity to generate an additional resonance close to 10 GHz. The combination of lower and upper band design results in a broadband antenna with dimensions of 30 mm × 30 mm × 9 mm (0.9λ<sub>0</sub> × 0.9λ<sub>0</sub> × 0.27λ<sub>0</sub>) is designed where λ<sub>0</sub> corresponds to the free space wavelength at a center frequency of 9 GHz. The measurement results verify the broad impedance bandwidth (VSWR ≤ 2) of the antenna at 77% (5.6–12.6 GHz) while the broadside gain is maintained between 6 dBi and 8 dBi within the operational broad bandwidth.

Proximity Coupled Micro-Strip Antenna for Bluetooth Application

Proximity Coupled Micro-Strip Antenna for Bluetooth Application

Proximity Coupled Microstrip Antenna for Bluetooth, WIMAX and WLAN Applications

This paper presents a new design of a multiband microstrip antenna with a proximity coupled feed for operating in the LTE2300 (2300–2400 MHz), Bluetooth (2400-2485 MHz), WiMAX (3.3-3.7 GHz), and WLAN (5.15-5.35 GHz, 5.725-5.825 GHz) bands. In addition, it also covers 6-dB impedance bandwidth across the UMTS (1920–2170 MHz) band. The proposed antenna consists of a corner-truncated rectangular patch with a rectangular slot, meandered microstrip feed, and defected ground plane. The antenna is fabricated using 0.8 mm thick FR4 substrate with a dielectric constant of 4.4 and has a small size of only 27x24 mm2. The antenna shows a stable gain over the operating bands and good radiation characteristics. The simulated and measured results are shown to have good agreements.

Multi‐band proximity coupled microstrip antenna for wireless applications

AbstractA novel and simple design of a multi‐band proximity coupled microstrip antenna for operating in the WiFi (2.4–2.48 GHz), WiMAX (3.44–3.53 and 5.25–5.85 GHz), and WLAN (5.15–5.35 GHz and 5.470–5.725 GHz or 5.725–5.825 GHz) bands is proposed. Apart from that, an additional band covering (3.8–4.2 GHz) is achieved, which may be used for fixed satellite communication. The proposed multiband antenna consists of a V‐slotted patch in conjunction with parasitic element, and L‐shaped microstrip line feed structure. Slot in the patch is introduced to reduce the overall size of the antenna and L‐shape feed is used for proper energy coupling to the parasitic element. The simulated gains are 3.47/1.62/0.72/6.22 dBi at 2.44/3.5/3.8/5.5 GHz, respectively, and the antenna shows broadside radiation characteristics. The simulated results are in good accord with the measured results.

Hybrid method to predict the resonant frequencies and to characterise dual band proximity coupled microstrip antennas

ABSTRACTA new hybrid technique, which is a combination of neural network (NN) and support vector machine, is proposed for designing of different slotted dual band proximity coupled microstrip antennas. Slots on the patch are employed to produce the second resonance along with size reduction. The proposed hybrid model provides flexibility to design the dual band antennas in the frequency range from 1 to 6 GHz. This includes DCS (1.71–1.88 GHz), PCS (1.88–1.99 GHz), UMTS (1.92–2.17 GHz), LTE2300 (2.3–2.4 GHz), Bluetooth (2.4–2.485 GHz), WiMAX (3.3–3.7 GHz), and WLAN (5.15–5.35 GHz, 5.725–5.825 GHz) bands applications. Also, the comparative study of this proposed technique is done with the existing methods like knowledge based NN and support vector machine. The proposed method is found to be more accurate in terms of % error and root mean square % error and the results are in good accord with the measured values.

Inclined Slot Loaded Proximity-Coupled Microstrip Antenna for WLAN

The design of a miniaturized proximity-coupled microstrip antenna (PCMA) is presented here. The antenna has very small size, wide bandwidth and moderate gain and may be used as small, compact antenna for 5GHz band wireless local area network (WLAN). Simulated results using IE3D software are verified by measurement.

Inclined Slot Loaded Proximity-Coupled Microstrip Antenna for WLAN

The design of a miniaturized proximity-coupled microstrip antenna (PCMA) is presented here. The antenna has very small size, wide bandwidth and moderate gain and may be used as small, compact antenna for 5GHz band wireless local area network(WLAN). Simulated results using IE3D software are verified by measurement.

Inclined Slot Loaded Proximity-Coupled Microstrip Antenna for WLAN

The design of a miniaturized proximity-coupled microstrip antenna (PCMA) is presented here. The antenna has very small size, wide bandwidth and moderate gain and may be used as small, compact antenna for 5GHz band wireless local area network (WLAN). Simulated results using IE3D software are verified by measurement.

A Broadband Impedance Matching Method for Proximity-Coupled Microstrip Antenna

In a proximity-coupled microstrip antenna, when a laminate used is too thick for the antenna layer, the coupling will be decreased. And it is hard to achieve broadband impedance matching. The authors present a method to optimize impedance matching through narrow cavity backed configuration. A prototype antenna is designed with this method and fabricated. Simulation and measurement results indicate that the bandwidth of the antenna exceeds 40% (VSWR < 2.0). The antenna has a larger effective coupling as compared with the conventional proximity-coupled antenna without the narrow cavity backed configuration. It is easier to enhance the bandwidth with a thicker laminate. Meanwhile, this antenna is benefit for manufacturing and assembling to an array due to its simple configuration.

Errata to "Improved Formulation for Investigation of Proximity-Coupled Microstrip Antenna in Homogeneous Dielectric Half Space" [Apr 08 927-932

In the above titled paper (ibid., vol. 56, no. 4, pp. 927-932, Apr. 08), two errors occurred in equation (30). The correct equation is presented here.

Improved Formulation for Investigation of Proximity-Coupled Microstrip Antenna in Homogeneous Dielectric Half Space

Analytical evaluation of asymptotic part of the Green's function, in product with piece-wise sinusoidal, entire domain, and travelling wave mode basis functions, is presented. The Sommerfeld type double integral in spectral domain is solved and reduced into a single integral in spatial domain with very short integration range. The derived results lead to develop a computational efficiency improved code, which has been found 27 times faster than the earlier validated common method of moments code.

Compact and Broadband Microstrip Antennas for Next Generation High-Speed Wireless Communication Using HIPERLAN/2

The investigations on rectangular-slot-loaded and V-slot-loaded proximity-coupled microstrip antennas are reported. The performances of two antennas are investigated for the application in wireless local area network 2 (HIPERLAN/2) using IE3D software and the computed results are verified by measurement. Results show that the antennas have wide bandwidth and moderate gain and may be used as small, compact antennas for HIPERLAN/2 communication.

Circularly polarized proximity-coupled microstrip antennas

A novel design for the production of circularly polarized radiation (CP) in proximity-fed microstrip antennas is presented. To achieve this circular-polarization design, the two orthogonal modes of the microstrip antenna are excited in series through the proximity coupling of an L-shaped open microstrip line. The experimental results show that the 3-dB axial-ratio CP bandwidth of the proposed design is increased by more than 30%, as compared to a conventional CP microstrip antenna of the same size. The details of the simulated and experimental results for the proposed design are presented and discussed. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 429–430, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21006

Simple, small antenna terminal for maritime satellite communications

A simple printed antenna that can be utilised for maritime satellite communications is presented. The antenna is based on a dual linearly polarised proximity coupled microstrip antenna on an extended hemispherical dielectric lens. The resulting small printed antenna is impedance matched over both the transmit (14.0-14.5 GHz) and receive (12.25-12.75 GHz) bands and has a gain of 21 and 20 dBi, respectively, over these frequency ranges.

An enhanced bandwidth design technique for electromagnetically coupled microstrip antennas

This paper describes a method of enhancing the bandwidth of two different electromagnetically coupled microstrip antennas by utilization of a tuning stub. An approximate theory and equations are developed to demonstrate the potential bandwidth improvement and required stub impedance characteristics. A novel dual-stub design is presented that achieves better characteristics than a conventional quarter wavelength open-end stub. As examples, the bandwidth (VSWR<2) of a conventional proximity-coupled microstrip antenna is increased from 4.8 to 8.4% and the bandwidth of a stacked aperture-coupled microstrip antenna is increased from 27.5 to 34.5% using this technique.

Modeling planar arbitrarily shaped microstrip elements in multilayered media

Microstrip elements of arbitrary shape are modeled in multilayered media. The Green's function for the multilayered structure is developed in a form useful for efficient computation for interacting microstrip elements, which may be located at any substrate layer and separated by an arbitrarily large distance. This result is of significant value to a variety of applications in wave propagation besides those discussed in this paper. The mixed-potential integral-equation (MPIE) method is developed in the spatial domain. Examples for regularly/arbitrarily shaped geometries in single and multilayered media are presented. These involve the optimization of an open-end microstrip, a radial-stub microstrip, a five-section overlay-gap-coupled filter, and a circular-patch proximity-coupled microstrip antenna. Very good agreement with measurement and other published data is observed.

A 16-element subarray for hybrid-circuit tile-approach spatial power combining

Three designs for a 4-by-4 subarray are described for use in a spatial power-combined transmitter. The subarrays are constructed using a hybrid-circuit, tile-approach architecture and are composed of 16 cavity-backed, proximity-coupled microstrip antennas, each fed by a 0.5 watt amplifier. Both linearly and circularly polarized subarrays have been constructed for operation over a 10% band centered at 10 GHz. The linearly polarized subarray showed the following peak performance: EIRP greater than 27 dBW, effective transmitter power greater than 5 watts, DC-RF efficiency greater than 20%, and excellent graceful degradation performance.

Synthesis of linear arrays of series fed proximity-coupled microstrip antennas

Cet article presente une synthese de reseaux rectilignes a ondes stationnaires ďelements microrubans du type doublets transverses, alimentees en serie par couplage de proximite. Le principe consiste a caracteriser chaque element rayonnant unitaire par son admittance propre, fonction de sa geometrie et du substrat employe, et par son admittance de couplage mutuel traduisant ľinfluence des autres elements composant le reseau. Ces donnees sont calculees grâce a un simulateur electromagnetique reposant sur la resolution ďequations integrales par la methode des moments, associe a un modele quadripolaire de ľ element rayonnant. Cette synthese est validee par des mesures realisees sur le diagramme de rayonnement ďune part et sur ľadaptation ďautre part ďun reseau de 20 doublets transverses. LĽimportance de la prise en compte du couplage mutuel dans une telle structure est clairement demontree.