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A horn antenna having dual-band and dual-polarisation operation is proposed. To implement a small-sized structure providing circular polarisations in the Ka- and K-band, the antenna is designed using the horn radiator on the basis of a conical helix which is exited by two ports for TX and RX in both ends. Through a design optimisation process, a compact dual-band and dual-polarised horn antenna having high gain and high isolation performance was realised. [ABSTRACT FROM AUTHOR]

Proposed is a novel way of inserting a propagation stop frequency band for dual-band operation of a leaky wave antenna (LWA). To make the LWA resonate at two frequencies, the stopband is introduced into an existing passband, which induces two specific conditions giving maximum radiation towards a boresight direction at the resonant frequencies locating on both sides of the stopband edge. All experiment results show good agreement with theoretical predictions, which proves the validity and effectiveness of the approaches. [ABSTRACT FROM AUTHOR]

Presented are tunable electrically small antennas composed of split ring resonators (SRRs), which are used to reduce antenna size. To control the resonance frequency, a lumped inductor is inserted between the SRRs and the ground. The proposed antenna operates within Korean personal communication services (PCS) frequency bands of 1750-1870 MHz, and the size of the antenna is 1/33λ0×1/33λ0 with an operating frequency of 1800 MHz. In spite of its small size, the radiation efficiency and -10 dB bandwidth were measured as 82% and 2.4%, respectively. Good agreement between the predicted and measured results ensures the validity of the design method to provide a frequency adjustment using lumped inductors in small SRR antennas. [ABSTRACT FROM AUTHOR]