An Ultra wideband patch antenna is tested in this paper for Impulse UWB applications. The UWB patch antenna is integrated with UWB bandpass filter of desired operating frequency range. The design is on FR-4 substrate with dielectric constant of 4.4 and thickness of 1.6 mm. Impulse performance and angle of operation for such antenna are shown.

An Impulse UWB Patch Antenna with Integrated Bandpass Filter

There has been a tremendous rumble in UWB research after the U.S. Federal Communications Commission (FCC) allocated a frequency range with a bandwidth of 7.5 GHz from 3.1–10.6 GHz for UWB applications. Ultra wideband (UWB) technology was earlier limited to special applications, primarily in the military area and there primarily to electronic warfare. The antennas were usually horn antennas or modified, ridged horn antennas, sometimes in combination with reflectors. Wearable intelligent textile system is an innovative fast growing field in application oriented field. In recent years, body-centric wireless communication becomes an important part of fourth generation mobile communication systems (4G). Utilization of wearable textiles in the antenna segment has been seen on the rise due to the recent miniaturization of wireless devices. Wearable and fabric-based antennas have become one of the dominant research topics in antennas for body-centric communications. The review presented here intended to disclose the unconventional antenna technology including UWB technology for wearable applications. Contributions by various researchers have been compiled keeping in mind background of UWB technology, the wearable antenna, and specification of the antenna, material for the antenna and analysis that must be done to design proper UWB wearable antennas for various applications.

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Advancement in Ultra Wideband Antennas for Wearable Applications

In this paper, a patch antenna with band notched characteristics for ultra wide band is proposed. The proposed antenna design is simulated on electromagnetic (EM) simulation software using FR-4 substrate with dielectric constant of 4.4 and thickness of 1.6 mm. The proposed antenna has a compact structure, the total size is 15&#x00C3; -- 14.5 mm2 and fed with 50 &#x00CE;&#x00A9; micro strip by optimizing the width of partial ground, the width of the feed line to operate in UWB. With the design, the return loss is lower than 10 dB in 3.1-10.6 GHz frequency range and show the band-notch characteristic in the UWB band to avoid interferences, which is caused by WLAN (5.15&#x00E2;"5.825 GHz) and WiMAX (5.25&#x00E2;"5.85 GHz) systems. In addition, band-notched filtering properties in the 5.15-5.825 GHz are achieved by rectangular slot on the radiating element. The proposed antenna is easy to integrate with microwave circuitry for low manufacturing cost. The antenna structure is flat, and its design is simple and straightforward.

A Novel UWB Band Notched Rectangular Patch Antenna with Square Slot

Due to the use of compact structures, whose dimensions are smaller than the dimensions of the quarter-wave segments, but have identical characteristics at the Central frequency of the device. The process of miniaturization of this construction on the basis of compact structures was shown on the example of a standard design of a broadband coupler. The area of the coupler, with a Central frequency of 1.8 GHz has been reduced by 70% in relation to the area of the traditional design.

Design of Broadband Branch-line Coupler Based on Compact Structure

An ultra wideband (UWB) patch antenna is analyzed in this paper The design uses FR-4 substrate with dielectric constant of 49 and thickness of 16 mm Circuit model of such antenna is developed under AWR microwave office environment Obtained results from simulating the antenna in CST microwave studio are then compared with the results taken from the Circuit Model

Circuit modeling of an UWB patch antenna

Additional guidelines for UWB antenna design are presented and a low-cost UWB antenna is proposed that offers circuit integration possibilities, namely, a partial ground plane triangular monopole (PGPTM). Time and frequency domain performance of this antenna is investigated with the simulation results being in good agreement with the measured values.

Development of a practical ultra-wideband antenna with planar circuit integration possibilities

A new high performance hybrid coupler has been presented that has an extreme degree of miniaturization. The device is based on a lumped equivalent model of a conventional hybrid coupler and was realized in a standard low permittivity LTCC technology. Measured results show insertion losses within 0.65 dB of the theoretical maximum, an amplitude imbalance of less than 0.18 dB and a phase difference of 87.4 degrees. The good performance and small size of the device presented here make it suitable for use as a discrete component for various purposes or as an integrated component for system-in-package applications. Also, the methodology used here is useful for the design of couplers for frequencies up to C-band range.

G. Brzezina

Papers

Development of a practical ultra-wideband antenna with planar circuit integration possibilities

A miniature lumped element LTCC quadrature hybrid coupler for GPS applications