Measurement of Antenna Radiation Pattern using Injection Locking Technique

This paper presents practical results using injection locking to synchronize the local oscillator on a wireless device enabling antenna measurements to be made in a modern anechoic chamber, overcoming the need to connect a cable to the device under tes

Benefits of active transmit balanced antenna fed by differential power amplifier

A differential amplifier feeding a balanced antenna is investigated experimentally. This approach would suit modern RFIC design rather than using a 50Ω unbalanced connection. As such the balun or power-combining network is eliminated resulting in a compact RF front-end design with wider bandwidth and lower losses. Experimental result shows that this technique promises higher output power compared to conventional feeding approach while using same RFIC and same power supply

Double-layer grid filter for control of wireless signal propagation within buildings

A simple Double–Layer Grid plane wave filter structure is proposed that can provide multiple transmission bands for cellular phone frequencies but with a reflection band for WLAN signals. The approach offers ease of construction making it applicable to building applications. A parametric study using simulation supported by simple experimental data investigates the proposed, novel design

Control of ground plane influence on antenna radiation pattern for mobile handheld devices

This paper presents the effects of a choke-slot on solid ground plane of an antenna, fabricated on FR4 substrate to be used in mobile communication system. Techniques have been discussed to control the ground plane current and reduce any degradation. The simulations and measurements show that introducing a slot on a conventional solid ground plane can significantly improve the radiation pattern of an antenna. Good performance at the Personal Communication Service (PCS 1900) band promises the use of this antenna on personal mobility, advance cellular phone services and wireless communication services. Achieving the maximum gain towards the expected direction for mobile phone application with the help of a choke-slot on antenna's ground plane demonstrates the effectiveness of this technique

Compact and Conformal Ultra Wideband Antenna for Wearable Applications

This paper presents the characteristics of a compact and conformal ultra wideband (UWB) antenna fabricated on Liquid Crystal Polymer (LCP) substrate to be used in wearable applications. The presented return loss and radiation pattern measurements demonstrated that the characteristics of the antenna are not compromised when the antenna is bent or even folded. The antenna shows similar and reliable electrical and mechanical performances in wearable electronics, where their planar condition cannot be guaranteed. The antenna's ability to work under adverse environments (i.e. under heating and in water) are also investigated and negligible impact of these conditions on antenna performance promises the use of such antenna in wearable applications