A wideband printed slot antenna with harmonic suppression

Abstract

A wideband slot antenna with harmonic suppression is proposed to utilize the environment microwave energy. The antenna element is a printed narrow slot with an offset microstrip‐feed line to widen the operating band by generating the double resonance of similar frequencies. By adding a rectangular notch in the middle of slot element and grounding the microstrip terminal, its second‐order and third‐order harmonics are effectively suppressed. The experimental results of the prototype antenna show that the fractional bandwidth of its fundamental mode can reach 37.4%, while the antenna efficiencies of the second and third harmonics both are less than 23%. In the operating band the prototype antenna has the approximately omnidirectional radiation characteristic. This antenna structure also provides relaxed fabrication tolerances.

Electromagnetic band gap based in Peano fractal geometry for harmonic suppression

“…18 Therefore, the EBG structure in this work, was inspired by PCs to prevent unwanted modes and to perform harmonic control, thus rejecting certain frequency bands. Figure 1 shows the first three iterations of the PCs in which the EBG was manufactured based on the second PC iteration, 19 in which part of the geometry below the antenna power line is used. This truncation made the dimensions of the holes compatible with the dimensions of the line, because when using the complete geometry, it would result in small dimensions and making the project more difficult.…”

“…1 In addition, other techniques are proposed in the literature for harmonic suppression, for example, photonic band gap, electromagnetic band gap (EBG), defective ground structure (DGS) with different shapes (Dumbbell, U and V Slot, Spiral), open stubs, inductively slow-wave transmission lines, compact micro resonant cell strips (CMSRC), slotted filtering antenna, and square sing slotted antenna with rectangular slots in the ground plane. 2,[4][5][6][7][8][9][10][11] However, other approaches are reported, such as a compact low pass filter, 12 spur-line filter, 13 microstrip patch antenna integrated with complementary split ring resonator etched in the ground plane, 14 frequency selective rasorber, 15 single-layer microstripfed patch antenna. 16 Thus, some of these techniques use fractal geometry in device design, as the application of DGS fractal array in a rectangular microstrip patch antenna (RMPA) to act as filters.…”

Characteristic mode analysis of harmonic suppressed stepped impedance strip dipole antenna

“…A better and effective way to mitigate these problems is the design of a harmonic suppressed antenna. As mentioned in References 10 and 11 slots and stubs can be used to achieve harmonic suppression in microstrip antennas. The photonic bandgap (PBG) and defected ground structures are widely utilized to suppress the higher harmonics.…”

A low‐profile planar monopole antenna for ISM/IMT/Bluetooth/Zigbee/WiFi/WiMAX/WLAN wireless communication applications

“…A good number of antennas are reported for 2.45 GHz and other narrowband applications 2–24 . Among them, microstrip planar antennas have drawn much attention due to their low profile, lightweight, and ease of mass production.…”