Abstract
A new compact multiband planar antenna combining an interdigital-coupled feeding line and one stepped-impedance structure is presented here. This antenna is capable of generating five resonant modes to cover the ISM 915/2400/5800 MHz bands, GPS band, and IMT C-band, respectively. The five resonant frequencies covered by the proposed antenna can be adjusted individually by controlling the impedances and electrical lengths of the corresponding stepped-impedance sections. An additional advantage of the proposed stepped-impedance structure is its ability to suppress higher order resonance modes, thus filtering out unwanted interference. The proposed antenna utilizes a simple planar compact structure and occupies a small area of only 12 × 30 mm2. Details of the antenna design and experimental results are presented and discussed.
Highlights
Mobile wireless communication handsets typically use multiband antennas to transmit and receive wireless signals to cover all required wireless communication frequency bands [1,2,3,4]
The planar inverted F-antenna (PIFA) typically exhibits performance limitations related to the radiating branches, generating the lower resonant modes and exciting several higher order modes
We present a novel compact multiband planar antenna formed by the interdigital-coupled feeding line, one stepped-impedance line, and one shorted stripe line connected to the ground plane of the mobile handsets
Summary
Mobile wireless communication handsets typically use multiband antennas to transmit and receive wireless signals to cover all required wireless communication frequency bands [1,2,3,4]. The PIFA typically exhibits performance limitations related to the radiating branches, generating the lower resonant modes and exciting several higher order modes. These unexpected higher modes will complicate frequency tuning of the multiband antenna. We present a novel compact multiband planar antenna formed by the interdigital-coupled feeding line, one stepped-impedance line, and one shorted stripe line connected to the ground plane of the mobile handsets. The stepped-impedance line forms folded stripe lines with different impedances and electrical lengths This stepped-impedance structure is introduced to control five resonant modes to cover ISM 915/2400/5800 bands, GPS band, and IMT C-band operations, respectively. Design consideration and experimental performances of the proposed antenna are studied and presented
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