Ieee transactions on antennas and propagation

A miniaturized textile antenna is designed and demonstrated for ISM band applications at 2.4 GHz. The proposed antenna uses appropriate loading of a rectangular slot/notch with a strip line inserted to form an inverted E-shaped antenna. The structure is simple, compact, and easy to manufacture using only fabric material. The antenna size is 75% smaller than a conventional antenna. When the antenna is subjected to bending, its performance proves sustainable under deformation. Each slot/notch and strip line is translated to its equivalent circuit and then integrated to form the whole equivalent circuit of the proposed antenna. The results from the equivalent circuits and simulation show acceptable agreement. The antenna shows an improvement of size miniaturization of $30 \times 20 \times 0.7$ mm3 and demonstrates an impedance bandwidth of 15% and efficiency of 79%, showing that it is a promising candidate for incorporation into wearable systems.

Inverted E-Shaped Wearable Textile Antenna for Medical Applications

In the present paper notch loaded shorted microstrip patch antenna has been analysed using cavity model. The proposed antenna shows dual band operation which depends on notch dimensions as well as shorting wall. The frequency ratio is found to be 1.5278 for the notch loaded rectangular patch, while in notch loaded shorted patch, the frequency ratio varies from 2.9764 to 2.725 for increasing value of notch width and it is almost invariant with notch depth. Further a slot loaded shorted patch antenna shows the dual frequency nature with the frequency ratio 1.7. The theoretical results are compared with IE3D simulation as well as reported experimental results.

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Compact Shorted Microstrip Patch Antenna for Dual Band Operation

A novel miniaturized frequency selective surface with excellent center frequency stability

A compact wearable symmetrical e-slots antenna operated at 2.4 GHz was proposed for Medical Body Area Network applications. The design was printed onto a highly flexible fabric material. The final design topology was achieved by the integration of symmetrical e-slots antenna with an Electromagnetic Band-Gap (EBG) and Defected Ground Structure (DGS). The use of EBG was to isolate the body and antenna from each other whereas the DGS widened the bandwidth. This combination forms a novel and compact structure that broadens bandwidth. This broadened bandwidth makes the structure robust to deformation and loading in the human body. The design achieved a measured impedance bandwidth of 32.08 %, a gain of 6.45 dBi, a Front to Back Ration (FBR) of 15.8 dB, an efficiency of 72.3% and a SAR reduction of more than 90%. Hence, the integration of symmetrical e-slots antenna with EBG and etched DGS is a promising candidate for body-worn devices.

/pdf/robust-and-efficient-integrated-antenna-with-ebg-dgs-enabled-439p0sjlux.pdf

Robust and Efficient Integrated Antenna With EBG-DGS Enabled Wide Bandwidth for Wearable Medical Device Applications

Single layer single feed dual and multifrequency patch antenna is introduced. Resonant frequency can be reduced and frequency ratio can be increased by cutting unequal rectangular slots at the edge. C band and X band operation can be successfully achieved with a size reduction of about 41%. Multifrequency operation can also be achieved by cutting two equal rectangular slots inside the patch. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2754–2758, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23790

Investigations on microstrip patch antennas with different slots and feeding points

This study presents theoretical and experimental investigations on novel, compact, single layer and single probe-fed rectangular microstrip patch antennas for dual and multi frequency operation. The novel design is achieved by cutting two rectangular slots at one side of the patch antenna. Compared with the conventional rectangular patch antenna, our antenna can achieve reduction in patch size up to 85%. Dual frequency operation has also been achieved effectively by just adjusting the feed position of a conventional rectangular patch antenna. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 961–965, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23255

Reduced size small dual and multi-frequency microstrip antennas

This study presents the theoretical and experimental investigation on the effect of rectangular slot on resonance frequency, return loss and band widths of a novel, single layer, single probe-fed rectangular microstrip patch antenna. The novel design is achieved by cutting the rectangular slots at the one radiating edge of the patch antenna. Compared to the conventional rectangular patch antenna, slot loading antennas give the better performance in resonant frequency, return loss in the cost of bandwidths. Resonance frequency reduction has also been achieved up to 36% as well as size reduction of more than 60%.

Effects of Slot Loading on Microstrip Patch Antennas

A novel design of a compact microstrip patch antenna using meandering technique is proposed in this paper where the designed antenna seems to behave as a microstrip patch loaded with conducting strips. A rectangular microstrip patch antenna with addition of conducting strip radiates at much lower frequency than a conventional rectangular microstrip antenna, due to increase of resonant length, but it also causes the increase in total size of the antenna. In this article, the resonant frequency has been lowered significantly by loading a regular rectangular microstrip patch antenna with rectangular slot in a proper position in such a way that the whole structure looks like a strip loaded radiator. About 86.5% size reduction has been achieved experimentally with very good agreement of simulated and measured results. The equivalent circuit and approximate resonant frequency calculation have been discussed in this paper.

https://www.jpier.org/pierc/pierc73/17.17020903.pdf

Slot Loaded Compact Microstrip Patch Antenna for Dual Band Operation

A novel approach on miniaturization of microstrip patch antenna with multi frequency operation is proposed in this article. In this paper we introduce symmetrical strips in both non radiating side of single layered, single coaxial fed rectangular microstrip patch antenna. It has been investigated that the strip loaded microstrip patch antenna radiates multiple frequencies and about 82% size reduction has been achieved. This result has been found by cutting slot on the patch and taking the ground plane is almost three times larger than the radiating patch.

Sunandan Bhunia

Papers

Investigations on microstrip patch antennas with different slots and feeding points

Reduced size small dual and multi-frequency microstrip antennas

Effects of Slot Loading on Microstrip Patch Antennas

Slot Loaded Compact Microstrip Patch Antenna for Dual Band Operation

A novel approach on miniaturization of microstrip patch antenna with loaded strips