ANT-2.4-JJB-xx Data Sheet by Product Description 7.0 mm The JJB Series packs near the performance of a (0.28") conventional monopole into an incredibly compact quarter-inch (7mm) diameter package. These antennas are ideal for any OEM application 9.0 mm requiring a compact, cosmetically attractive, (0.35") low-cost antenna solution. The antenna features a through-hole feedline that can attach directly 17.6 mm (0.69") to a user’s PCB. Internal or external mounting is possible. 8.6 mm (0.34") Features 2.0 mm (0.08") • Very low cost • Ultra-compact package 1.0 mm (0.04") • Easily concealed internally • Good for internal or external mounting • Excellent performance • Omni-directional pattern • Use with plastic* enclosures 14.5 mm *Requires proximity ground plane ANT-916-J(0J.B57-"A)RNAT-916-JJB-RA No ground plaNneo ogrr otruancde splane or traces Electrical Specifications 5.5 mm (0.22u")nder the anteunnndaer the antenna Center Frequency: 2.45GHz 1.0 mm (0.04") Recom. Freq. Range: 2390–2480MHz Socket or plateSdo chkoelet or plated hole 5.5 mm Wavelength: ¼-wave Ground pl(0a.2n2e") Gonro buontdto pmlane on bottom VSWR: ≤ 2.0 typical at center layer for countlearypeori sfoer counterpoise Peak Gain: RA: 3.3dBi 50-ohm micros5t0ri-po hlinme microstrip line ST: –1.5dBi Recommended Mounting Impedance: 50-ohms Right Angle Straight Connection: Direct solder No ground plane Oper. Temp. Range: –40°C to +90°C or traces under the antenna RA electrical specifications and plots measured on a 3.81 cm x 8.38 cm (1.50" x 3.30") ground plane 1.91 mm (0.075") ST electrical specifications and plots measured on a 8.89 cm x plated hole 8.89 cm (3.50" x 3.50") ground plane Ground plane on Ordering Information bottom layer for counterpoise ANT-2.4-JJB-RA (Right-Angle) ANT-2.4-JJB-ST (Straight) 50-ohm microstrip line – 1 – Revised 4/11/16

Counterpoise Quarter-wave or monopole antennas require an associated ground plane counterpoise for proper operation. The size and location of the ground plane relative to the antenna will affect the overall performance of the antenna in the final design. When used in conjunction with a ground plane smaller than that used to tune the antenna, the center frequency typically will shift higher in frequency and the bandwidth will decrease. The proximity of other circuit elements and packaging near the antenna will also affect the final performance. For further discussion and guidance on the importance of the ground plane counterpoise, please refer to Linx Application Note AN-00501: Understanding Antenna Specifications and Operation. VSWR Graph VSWR 1.403 1.307 Reflected Power 3:1 25% 2:1 11% 1:1 0% CENTER 2.450GHz ST SPAN 200.000MHz CENTER 2.450GHz RA What is VSWR? The Voltage Standing Wave Ratio (VSWR) is a measurement of how well an antenna is matched to a source impedance, typically 50-ohms. It is calculated by measuring the voltage wave that is headed toward the load versus the voltage wave that is reflected back from the load. A perfect match will have a VSWR of 1:1. The higher the first number, the worse the match, and the more inefficient the system. Since a perfect match cannot ever be obtained, some benchmark for performance needs to be set. In the case of antenna VSWR, this is usually 2:1. At this point, 88.9% of the energy sent to the antenna by the transmitter is radiated into free space and 11.1% is either reflected back into the source or lost as heat on the structure of the antenna. In the other direction, 88.9% of the energy recovered by the antenna is transferred into the receiver. As a side note, since the “:1” is always implied, many data sheets will remove it and just display the first number. How to Read a VSWR Graph VSWR is usually displayed graphically versus frequency. The lowest point on the graph is the antenna’s operational center frequency. In most cases, this will be different than the designed center frequency due to fabrication tolerances. The VSWR at that point denotes how close to 50-ohms the antenna gets. Linx specifies the recommended bandwidth as the range where the typical antenna VSWR is less than 2:1. – 2 – Data Sheet ANT-2.4-JJB-xx by

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