A slot inverted‐F antenna with multiband operations for long‐term evolution (LTE700/2500) and penta‐band wireless wide area network (WWAN) applications is presented. The antenna fabricated on a direct bond copper Al2O3 substrate consists of multibranch strips and a slot which occupy a compact size of merely 97(L) × 11.2(W) × 0.5(H) mm3 to be easily embedded in the laptop computer as an internal antenna. By properly designing the multibranch inverted‐F antenna, three bands covering 659–973 MHz, 1689–2179 MHz and 2449–2779 MHz for the LTE700, GSM850/900, DCS/PCS/UMTS, and LTE2500 operations are achieved with good radiation efficiencies. Thus, the proposed antenna is well suitable to be embedded in the laptop computer for the LTE and WWAN applications.
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Hu et al. (2011) studied this question.
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