A microstrip‐fed half‐wavelength folded‐slot antenna that is cut at the finite ground plane edge for bandwidth enhancement as well as size reduction of the conventional folded‐slot antenna is proposed. The antenna is fabricated within limited space of 35 mm × 12 mm on a 35 mm × 35 mm substrate, which is about the size of typical PCB for of RF modules used in wireless communication systems. The measured impedance bandwidth (S11 ≤ −10 dB) and maximum antenna gain over the passband are 92.5% (2.63∼7.27 GHz) and 4.69 dBi, respectively. The measured radiation patterns are similar to those of the conventional folded‐slot antennas and are stable across the pass band. These properties and its compact structure render the proposed antenna suitable for applications in various wireless communication systems. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2248–2251, 2013

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A microstrip-fed miniaturized folded-slot antenna that is cut at the finite ground plane edge for the size reduction is proposed as a ZigBee module operating in the 2.4 GHz frequency band, as specified by the IEEE standard 802.15.4. The antenna is fabricated within space limited to 35 mm × 9 mm on a 35 mm × 35 mm substrate, which is about the PCB size of a typical wireless ZigBee module. The measured impedance bandwidth and antenna gain are 2.37 ~ 2.49 GHz and 2.4 dBi respectively. The measured radiation patterns are similar to conventional folded-slot antennas and are also stable across the pass band. These properties and its compact structure help in making the antenna suitable for ZigBee module.

In this paper, a small inverted-F antenna with adjustable characteristics is proposed with use of lumped elements, capacitor and resistor. Capacitor is inserted between end of the antenna and ground for size reduction and tuning of resonant frequency. On the other hand, 0 Ω resistor is replaced as the short line connected to ground. The movement of short point due to use of 0 Ω resistor results in providing variation of input impedance. Therefore optimum characteristics can be obtained only by proper choice of capacitor and short point without redesign of it's geometry. In order to check the validity, the proposed antenna is designed and fabricated for 2.4 GHz frequency band, and then is applied to a product of Zigbee wireless remote controller. As a result, the size of applied antenna is 8.5 × 4.5 mm2 and it is observed that the measured bandwidth and antenna gain are 150 MHz and 2 dBi respectively without redesign of the antenna.