Abstract
Applications using a monopole often require an antenna height that is shorter than one‐quarter wavelength. For such applications, the monopole is bent; this antenna is called the inverted‐L antenna (ILA). This chapter presents a technique to further increase the voltage standing wave ratio (VSWR) bandwidth and discusses the radiation characteristics of the Inverted‐F Antennas (IFA). The VWSR bandwidth is approximately 26% that is more than three times as wide as that for the isolated IFA. The phenomenas shown in the chapter indicate that the lower and higher resonance frequencies are independently controlled by lengths L IL and L FD , respectively. Hence, it is inferred that, if these resonance phenomena are appropriately used, the VSWR bandwidth for the IFA with the parasitic IL element can be made wider than that for the IFA without the parasitic element. The chapter investigates an IFA with a single parasitic IL element and discusses an IFA with a pair of parasitic IL elements.
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